Relevant bibliographies by topics / Modifed concrete

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Modifed concrete'

Author: Grafiati
Published: 4 June 2025
Last updated: 23 June 2025

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Journal articles on the topic "Modifed concrete"

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Vorozhbiyan, R. M., G. N. Shabanova, and A. N. Korogodskaya. "Refractory concrete based on alumina cement out of low-grade raw materials." NOVYE OGNEUPORY (NEW REFRACTORIES), no. 9 (December 29, 2018): 47–51. http://dx.doi.org/10.17073/1683-4518-2018-9-47-51.

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The development results are given for the refractory concretes based on the modifed alumina cement with the using of the chemical industry wastes. The quantitative ratio for the near-gravity materials, the technological factors' influence on the concrete strength, the dependence of its strength properties on the flling aggregate's kind and its curing conditions were defned in the article. It was shown that the physical and mechanical properties of the developed concretes are as good as those of the commercial concretes. According to all technical characteristics this kind of production can be introduced for using as the high temperature vessels' lining material.Ill.6. Ref. 11. Tab. 4.
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Juan, Pablo Valencia-Villegas, María González Mesa Ana, and Felipe Arbeláez-Pérez Oscar. "Properties of modified concrete with crumb rubber: Effect of the incorporation of hollow glass microspheres." Revista Facultad de Ingeniería, Universidad de Antioquia, no. 98 (April 28, 2020): 59–68. https://doi.org/10.17533/udea.redin.20200473.

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In this study, the effect of incorporating hollow glass microspheres (HGM) on the  mechanical properties of modified concrete with CR (crumb rubber) was evaluated. Different concrete samples replacing  15% of fine aggregates (total weight of CR + HGM = 15%) were prepared. It was found that the increase in the microsphere content was directly proportional to the slump, compressive strength, and the modulus of elasticity. The increase in the microsphere content was inversely proportional to density. Additionally, we found that in the modified concrete, the width, height and the number of cracks increased as the HGM content increases. The combined sample HGM12.5-CR2.5 (the one with the highest content of microspheres) resulted in concrete with the highest compressive strength of 19.1 MPa, which is 243% stronger than the concrete with only crumb rubber (9.2 MPa). From the XRD results, we were able to detect the presence of different phases formed by hydration during the process of preparing concrete mixtures. The micrographs allowed identifying the fracture in the microspheres during the preparation of the concrete mixtures when they came into contact with the aggregates. The addition of hollow glass microspheres to the mixtures prepared from crumb rubber improved their mechanical properties, and this makes it a potential system that can replace the traditional materials in the production of concrete.
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Witkowski, Hubert, Janusz Jarosławski, Artur Szkop, Karol Chilmon, Maciej Kalinowski, and Wioletta Jackiewicz-Rek. "The Potential Risk of Nanoparticulate Release from Photocatalytic Pavement Concrete Surface Due to a Simulated Abrasion Load—An Experimental Study." Materials 17, no. 12 (2024): 3022. http://dx.doi.org/10.3390/ma17123022.

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The risk of the releasing of nanometric particles from construction materials with nanometric components might be one of the biggest threats to further development of them. One of the possible ingress routes to human organisms is the respiratory system. Therefore, it is crucial to determine the risk of emission of nanometric particles during material usage. In the presented paper, abrasion of mortar samples with nanometric TiO2 was investigated. A special abrasion test setup was developed to reflect everyday abrasion of the concrete surface of pavements. In the study, three TiO2-modifed mortar series (and respective reference series) underwent the developed test protocol and the grains were mobilized from their surface due to the applied load analyzed (granulation, morphology, and chemical composition). For a comparative analysis, an abrasion parameter was developed. Based on the obtained results, the modification of cementitious composites with nanometric TiO2 contributed to a reduction in the emission of aerosols and, therefore, confirmed the compatibility between TiO2 and cement matrix.
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Shu, Xing Wang, and Ying Zhang. "Mechanical Properties of Modified Epoxy/Rubber Concrete." Materials Science Forum 859 (May 2016): 39–44. http://dx.doi.org/10.4028/www.scientific.net/msf.859.39.

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To research the effect of a elastic modifier on the mechanical properties of epoxy/rubber concrete, series of epoxy/rubber concretes were prepared with different elastic modifier content, the relationship between elastic modifier content and stress-strain curve of epoxy/rubber concretes were investigated. Results show: as the increase of elastic modifier content, both the compressive and bending stress-strain curves of epoxy/rubber concretes experience a stage transition of elastic-elastoplasticity-plastic apparently; the slope in the rising and falling section of stress-strain curves are gradually decreased; the peak stress decrease while the corresponding strain and stain energy increase. Content of elastic modifier between 40pbw and 60 pbw is proposed in order to attain better properties of epoxy/rubber concrete. Compared with ordinary concrete and rubberized concrete, Improved epoxy/rubber concrete has better comprehensive mechanical properties and larger rubber content.
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Grinys, Audrius, Danutė Vaičiukynienė, Algirdas Augonis, Henrikas Sivilevičius, and Rėda Bistrickait. "EFFECT OF MILLED ELECTRICAL CABLE WASTE ON MECHANICAL PROPERTIES OF CONCRETE." Journal of Civil Engineering and Management 21, no. 3 (2015): 300–307. http://dx.doi.org/10.3846/13923730.2015.1005019.

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The article focuses on investigation of mechanical and fracture properties of concrete containing electrical cable waste as well as some microstructural features of such concrete. Added to concrete, electrical cable waste reduces the overall concrete bulk density. Compressive, flexural, tensile splitting strengths and elastic modulus decreased when electrical cable waste was admixed to conventional and polymer modified concretes. The best mechanical properties of concrete samples containing electrical cable waste were identified in polymer modified concrete containing 5% of electrical cable waste. Electrical cable waste particles increase the deformability of polymer modified concretes and have almost no influence on normal concrete. Consequently, the optimal amount of electrical cable waste particles can provide concrete with desirable strength that is required for different applications.
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Balabanov, Vadim, Victor Baryshok, and Nikita Epishkin. "Concrete based on sulfur binder being modified with inorganic additives." MATEC Web of Conferences 212 (2018): 01013. http://dx.doi.org/10.1051/matecconf/201821201013.

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The sharply continental climate of the Irkutsk region is characterized by wide temperature intervals throughout the year. The repeated cyclicity of freezing and thawing of building materials in the water-saturated state influences the change in technical characteristics and the durability of concrete products and structures. The concrete products’ features in such climatic conditions create the need for the production of concretes with improved indicators of physical and mechanical properties. The effect of modifying additives on the technological characteristics of sulfur concrete is established. The effect of all elements of sulfur concrete on its strength and frost resistance. The composition of sulfuric concrete is obtained, which meets all the requirements and also has high strength and increased frost resistance. Formulations with a certain ratio of structural sulfuric concrete mixtures were developed. As a result of the use of technical sulfur in the composition of concrete products, the problem of utilizing annually accumulating reserves of technical sulfur is partially solved. The strength properties of sulfuric concretes easily compete with high-quality brands of concrete, special types of concretes that have in their composition additives.
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Mishutin, Andriy, Kos Zeljko, Grynyova Iryna, and Lucia Chintea. "Durability of Modified Fiber Concrete for Rigid Pavements." Croatian Regional Development Journal 2, no. 1 (2021): 30–40. http://dx.doi.org/10.2478/crdj-2021-0006.

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Abstract Modified concretes and fiber concretes for rigid pavements have been investigated. Four-factor experiment was conducted. The amount of Portland cement, polypropylene fiber, metakaolin and polycarboxylate superplasticizer varied in the experiment. All mixtures had the same mobility S2. The active mineral additive metakaolin increases the compressive strength of concrete and its tensile strength in bending. The amount of metakaolin at the level of 15.20 kg/m3 is rational. Due to a decrease in W/C with an increase in the amount of superplasticizer Coral ExpertSuid-5 to 0.9.1%, the compressive strength of concrete increases by 5.7 MPa, the tensile strength in bending increases by 0.5.0.6 MPa. Due to the introduction of polypropylene fiber, the tensile strength of concrete in bending increases by 0.6.0.9 MPa, the frost resistance of concrete increases by 50 cycles. Due to the use of a rational amount of superplasticizer and metakaolin, the frost resistance of concretes and fiber concretes concrete increases by 50-100 cycles. The use of a rational amount of modifiers and fiber reduces the abrasion of concretes by 40.45%. The developed modified fiber concretes of rigid pavements, depending on the amount of Portland cement, have compressive strength from 55 MPa to 70 MPa, tensile strength in bending from 8 MPa to 9.5 MPa, frost resistance from F350 to F450, abrasion from 0.30 to 0.40 g/cm2. Such strength, frost resistance and abrasion resistance allow the use of fiber concretes in pavements with the greatest load and ensures high durability of the material and corresponds to the directions and tasks of the state scientific and technical program “National Transport Strategy of Ukraine for the period up to 2030”
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Kim, Kwang W., Seung Jun Kweon, Young S. Doh, and Tae-Soon Park. "Fracture toughness of polymer-modified asphalt concrete at low temperatures." Canadian Journal of Civil Engineering 30, no. 2 (2003): 406–13. http://dx.doi.org/10.1139/l02-101.

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The fracture toughness of asphalt concrete increases at low temperature and then decreases at temperatures below a certain level. Some polymers are known to have the property of improving the temperature susceptibility of asphalt binder at low temperatures. Therefore, this study evaluated the fracture toughness (KIC) of some polymer-modified asphalt concretes. Low-density polyethylene (LDPE), styrene–butadiene–styrene (SBS), and a mixed polymer of LDPE and SBS were used in this study. The fracture toughness KIC of normal asphalt concrete was compared with that of polymer-modified asphalt (PMA) concrete, and the effectiveness of polymer modification against falling values of KIC was evaluated at low temperatures. The results showed that PMA concretes, in general, showed better KIC than normal asphalt concretes, and the temperature at which the highest KIC was obtained was lower than that in the case of normal asphalt concrete. Therefore, the PMA concretes evaluated in this study had better fracture resistance than normal asphalt at low temperatures.Key words: asphalt concrete, polymer-modified asphalt, PMA, fracture toughness, differential thermal contraction, low-temperature damage.
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Kaprielov, S. S., A. V. Sheynfeld, I. A. Chilin, V. G. Dondukov, and N. M. Selyutin. "Modified concrete: reality and prospects." Bulletin of Science and Research Center of Construction 40, no. 1 (2024): 92–104. http://dx.doi.org/10.37538/2224-9494-2024-1(40)-92-104.

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Aim. To review the history of concrete technology over the past 30 years and to analyze current trends in the field.Reality. New concepts and terms that manifest the level of modern science in the field of concrete technology are given. It is shown that the use of complex organomineral modifiers produced on an industrial scale, which are characterized by unique compositions, forms, and processability, allowed Russia to organize promptly mass production of concrete with high performance properties in the amount of about 5 million m3. Examples of construction of unique structures from new modified concretes are presented. The list of such structures includes high-rise buildings, sports facilities, bridges, overpasses, tunnels, etc.Prospects. Priority tasks for further development of concrete technology in Russia have been formulated. Among them are the development and improvement of physical and technical characteristics of concretes; extended use of large-tonnage technogenic wastes in production of concrete mixtures; updating and development of new normative documents for calculation, design, and erection of modern structures with high operational reliability, durability, and aesthetic properties.
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Al Bakri, A. M. Mustafa, Y. Zarina, M. N. Noor, H. Kamarudin, C. M. Ruzaidi, and A. R. Rafiza. "Study of Concrete Using Modified Polystyrene Coarse Aggregate." Advanced Materials Research 740 (August 2013): 502–6. http://dx.doi.org/10.4028/www.scientific.net/amr.740.502.

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Polymer recycling has received a great deal of attention in recent years. At the present time, small percentages of polymer wastes in Malaysia are being recycled. The recycling process has typically consisted of reprocessing the waste material to make other polymeric products or energy recovery from complete combustion. Thus, the development of concrete using non-conventional aggregates, such as polymer waste (especially polystyrene), ceramic waste, or other wastes, has been investigated to determine the comparative properties of the various concretes and the comparative costs. This paper the results of an experimental study in which the coarse aggregates used in conventional concrete were replaced by polystyrene waste aggregate to produce a lightweight material. The proportions of the mixtures were varied to determine the water-cement ratio and the content of polystyrene waste aggregates that provide the best results. The properties of the aggregates were also compared. Strength tests were conducted after the experimental concrete was cured for 28 days, and the experimental results indicated that the strength of the concrete made with polystryene waste aggregate ranged from 14 to 17 MPa. In addition, the density of these concretes ranged between 1467 to 1560 kg/m3, which means that they would be categorized as lightweight concretes. The results also indicated that the workability of the polystyrene waste aggregate concretes was good, and the strength characteristics were comparable to those of conventional concrete.
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Dissertations / Theses on the topic "Modifed concrete"

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Rossignolo, João Adriano. ""Concreto leve de alto desempenho modificado com SB para pré-fabricados esbeltos - dosagem, produção, propriedades e microestrutura"." Universidade de São Paulo, 2003. http://www.teses.usp.br/teses/disponiveis/88/88131/tde-25102005-104002/.

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Esta tese aborda a aplicação da tecnologia dos concretos leves de alto desempenho (CLAD) para a produção de elementos construtivos esbeltos pré-fabricados, tais como painéis estruturais e de vedação e peças para cobertura, apresentando um concreto com propriedades especiais em função da utilização conjunta de látex de estireno butadieno (SB), sílica ativa, superplastificante acelerador e agregados leves nacionais, denominado concreto leve de alto desempenho modificado com SB. Desenvolveu-se um amplo programa experimental para a análise dos concretos, tendo como objetivos o estudo dos processos de dosagem e produção, caracterização das propriedades dos concretos nos estados fresco e endurecido, análise da ductilidade de elementos construtivos esbeltos pré-fabricados submetidos à flexão, assim como a obtenção de informações microestruturais sobre a matriz de cimento e a zona de transição entre o agregado e a matriz de cimento. Os resultados do programa experimental demonstraram que os concretos leves de alto desempenho modificados com SB são extremamente adequados à produção de elementos pré-fabricados esbeltos, devido essencialmente à redução da massa específica e ao excelente desempenho das propriedades relacionadas à resistência mecânica e durabilidade. Nos estudos microestruturais, observou-se que a utilização de sílica ativa e de SB promoveram a diminuição da quantidade e do diâmetro dos poros capilares e da quantidade de hidróxido de cálcio (CH) na matriz de cimento, assim como reduziram a espessura da zona de transição agregado-matriz. Observou-se, também, que os concretos com agregados leves nacionais apresentaram valores da espessura da zona de transição agregado-matriz inferiores aos observados para os concretos com agregados tradicionais.<br>This dissertation deals with the application of the high performance lightweight aggregate concrete (HPLWAC) for the production of thin precast components, such as structural and insulation panels and elements for covering. A concrete with special properties was presented, once the use of styrene-butadiene latex (SBR), silica fume, accelerating superplastificizer and Brazilian lightweight aggregates, named SBR-modified high performance lightweight aggregate concrete. Our main goals in the experimental program were the study of concrete dosage and production, the characterization of concretes properties, the thin precast components analysis, as well as the microstructural study about both cement paste and the interfacial transition zone (ITZ) between aggregate and cement paste. The main results show that the SBR-modified HPLWAC are extremely appropriate to the production of thin precast components, due essentially to the density reduction and to the high performance of mechanical and durability properties. Besides this, it was viewed that the silica fume and SBR use promote the decrease of the amount and diameter of the capillary pores, as well as the amount of calcium hydroxide (CH) in the cement paste. Additionally, they reduce the thickness of the interfacial transition zone between aggregate and cement paste. It was also observed that the concretes with Brazilian lightweight aggregate presented lower values of the interfacial transition zone thickness than the ones observed for the concretes with traditional aggregates (basalt).
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Meneguini, Eduardo Cesar Antonelli. "Avaliação de concreto asfáltico com incorporação de pó de borracha reciclada de pneus, tratada superficialmente com hidróxido de sódio comercial." [s.n.], 2011. http://repositorio.unicamp.br/jspui/handle/REPOSIP/258506.

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Orientador: Vladimir Antonio Paulon<br>Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Civil, Arquitetura e Urbanismo<br>Made available in DSpace on 2018-08-19T19:32:15Z (GMT). No. of bitstreams: 1 Meneguini_EduardoCesarAntonelli_D.pdf: 4162044 bytes, checksum: 987787614d2ef9437a3937a43815bde9 (MD5) Previous issue date: 2011<br>Resumo: O principal objetivo deste trabalho é a determinação das principais propriedades do asfalto borracha e das propriedades mecânicas de um concreto asfáltico, tendo, como adição, o uso de borracha moída de pneus usados, tratada com solução de hidróxido de sódio comercial. Obtivemos, com o tratamento superficial da borracha de pneus usados, melhor interface entre a borracha e asfalto, assim como com o concreto asfáltico e a borracha, alcançando sensível aumento da durabilidade do asfalto-borracha. Realizamos, primeiramente, ensaios para caracterizar o asfalto-borracha tratado de acordo com as Normas vigentes, ensaios de durabilidade e, em seguida, ensaios mecânicos do concreto asfáltico. A recuperação elástica do asfalto-borracha utilizando pó de borracha tratada com hidróxido de sódio aumentou em 10% quando comparados com asfalto-borracha sem tratamento. Os resultados demonstraram melhora da estabilidade à estocagem em 42% nos ensaios realizados. Os ensaios de envelhecimento demonstraram que o tratamento do pó de borracha com hidróxido de sódio aumentou sensivelmente sua durabilidade. O ensaio de variação de massa, após o ensaio de envelhecimento, demonstrou que a perda de massa dos corpos de prova utilizando pó de borracha tratada com hidróxido de sódio foi 111% melhor quando comparados com os corpos de prova utilizando pó de borracha sem tratamento. Concluímos que há grande aplicabilidade deste asfalto-borracha na construção civil<br>Abstract: The main objective of this study is to determine the main properties of the asphalt-rubber and the mechanical properties of an asphalt concrete, with the addition of ground rubber from second-hand tires, treated with a sodium hydroxide commercial solution. We obtained, with the superficial treatment of rubber from second-hand tires, a better interface between the rubber and the asphalt, as well as with the asphalt concrete and the rubber, achieving significant increase in the durability of the asphalt-rubber. We undertake tests to characterize the treated asphalt-rubber according to current standards, durability tests, and then mechanical tests of the asphalt concrete. The elastic recovery of the rubber asphalt with rubber powder treated with sodium hydroxide increased by 10% compared to the untreated rubber asphalt. The results showed an improved stability to storage in 42% in the tests. The aging tests showed that the treatment of the rubber powder with sodium hydroxide significantly increased their durability. The mass change test after the aging test showed that the mass loss of the specimens with rubber powder treated with sodium hydroxide was 111% better when compared to the specimens with rubber powder without treatment. We conclude that there is great use of this rubber asphalt in the construction industry<br>Doutorado<br>Saneamento e Ambiente<br>Doutor em Engenharia Civil
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Gowripalan, N. "Reinforcement of concrete elements with modified polymers." Thesis, University of Leeds, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.378032.

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Watson, David William. "Monitoring moisture movement within modified concretes." Thesis, Heriot-Watt University, 1997. http://hdl.handle.net/10399/641.

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Oommen, Dony Cherian. "Carbon fiber reinforced latex modified concrete for bridge deck overlays." Morgantown, W. Va. : [West Virginia University Libraries], 2006. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=4760.

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Thesis (M.S.)--West Virginia University, 2006.<br>Title from document title page. Document formatted into pages; contains x, 103 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 84-87).
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Gilleece, Peter R. V. "An investigation of chloride penetration into modified concretes." Thesis, Queen's University Belfast, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.247346.

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Buchanan, Patricia Michelle. "Shrinkage of Latex-Modified and Microsilica Concrete Overlay Mixtures." Thesis, Virginia Tech, 2002. http://hdl.handle.net/10919/33102.

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Highway bridge decks are often overlaid to extend service life by reducing the rate of chloride ion ingress and the rate of corrosion of reinforcing steel in the sound chloride-contaminated concrete that is left in-place. Bridge deck overlays in Virginia are usually either latex-modified concrete or microsilica concrete, and both types of overlay are considered equivalent in terms of performance. However, the latex-modified concrete overlays are more expensive to construct than the microsilica concrete overlays. Thus, it is important to determine if these overlays do perform equivalently to ensure that short-term savings do not lead to higher long-term costs. Shrinkage is one of the overlay performance parameters. Shrinkage is a three-dimensional deformation of concrete that results in an overall reduction in volume. Total shrinkage may be measured under either restrained or unrestrained conditions. This research examines the shrinkage performances of Virginia Department of Transportation-approved latex-modified and microsilica concrete overlay mixtures and was conducted on both field-sampled and laboratory-fabricated restrained and unrestrained specimens. Based on crack and delamination surveys of sampled bridge decks and laboratory test results, a shrinkage performance-based specification for the Virginia Department of Transportation was developed. There was no significant difference between the unrestrained shrinkage values of latex-modified and microsilica concrete overlay mixtures for the specified time periods. Restrained microsilica concrete specimens generally cracked earlier and more frequently than restrained latex-modified concrete specimens. However, the bridge deck crack and delamination surveys show that construction conditions and quality and traffic type and frequency may have a greater effect on cracking than the overlay material.<br>Master of Science
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Konduru, Sathish Kumar Raju. "Performance evaluations of latex-modified and silica fume modified concrete overlays for bridge decks." Morgantown, W. Va. : [West Virginia University Libraries], 2009. http://hdl.handle.net/10450/10559.

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Thesis (M.S.)--West Virginia University, 2009.<br>Title from document title page. Document formatted into pages; contains xv, 235 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 212-216).
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Nguyen, Tom P. "MITIGATING MOISTURE SUSCEPTIBILITY IN HOT-MIX ASPHALT CONCRETE." DigitalCommons@CalPoly, 2011. https://digitalcommons.calpoly.edu/theses/467.

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Moisture damage in asphalt pavement has always been a problem for drivers, bicyclists, and pedestrians. The primary objective of this study is to evaluate moisture susceptibility of Hot-Mix Asphalt (HMA) and to investigate mitigation techniques using different antistripping agents. Three types of antistripping agents were used in this research investigation. Two of which are chemical based and the other is hydrated lime. The two types of liquid antistripping agents used in this study include Arr Maz CC LOF-6500 and Arr Maz CC XL-9000. These two liquid antistripping agents were tested at 0.25%, 0.50%, and 0.75%. Hydrated Lime was tested at 1.0%, 1.5%, and 2.0%. The binder used in this study is Asphalt Performance Grade (PG) 64-16 provided by Oxnard Refinery. The crushed stone aggregate used in this study was provided by Cal Portland. This study follows the guidelines of standardized AASHTO, ASTM, and SuperPave mix design for all preparation and test procedures. A total of 120 4-inch by 2.83-inch core specimens with void ratios between 6 to 8 percent were created to test for moisture susceptibility in accordance with the Modified Lottman Test, which tested for Indirect Tensile Strength and Immersion Compression Test, which tested for Compression Strength and Elasticity. During the test, half of these specimens were placed in a hot water bath for 24 hours to condition the sample to represent field performance and the other half were unconditioned. Based on the results, the best liquid antistripping agent is XL-9000 at 0.50% and hydrated lime is most efficient at a dosage rate of 1.5%. The best performing antistripping additive for the value is hydrated lime at 1.5%.
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Lone, Ashfaq Hussain. "Engineering and durability properties of concrete modified by redispersible polymer powder." Thesis, University of Sheffield, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.420813.

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Books on the topic "Modifed concrete"

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ACI Committee 548, Polymers in Concrete., ed. Polymer-modified concrete. American Concrete Institute, 2003.

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W, Fowler David, and ACI Committee 548, Polymer in Concrete., eds. Polymer modified concrete. American Concrete Institute, 1987.

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V, Ramakrishnan. Latex-modified concretes and mortars. Transportation Research Board, National Research Council, 1992.

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Hunt, Liz. Crumb rubber modified asphalt concrete in Oregon. Oregon Dept. of Transportation, Research Group, 2002.

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James, Charles P. Microsilica modified concrete for bridge deck overlays: Final report. Research Unit, Oregon Dept. of Transportation, 1997.

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Bramer, Thomas F. Van. Performance of two rubber-modified asphalt-concrete overlays: A three-year progress report. Engineering Research and Development Bureau, New York State Dept. of Transportation, 1992.

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Lundy, James Ray. Latex and microsilica modified concrete bridge deck overlays in Oregon: Final report. Oregon Dept. of Transportation, Research Unit, 1997.

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ACI Committee 548, Polymers in Concrete. and American Concrete Institute, eds. State-of-the-art report on polymer modified concrete. American Concrete Institute, 1995.

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Papagiannakis, A. T. A review of crumb-rubber modified asphalt concrete technology. Washington State Dept. of Transportation, 1995.

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Bahia, Hussain U. Investigation of modified asphalt performance using SHRP binder specification. Wisconsin Dept. of Transportation, Division of Transportation Infrastructure Development, Bureau of Highway Construction, Pavements Section, 1997.

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Book chapters on the topic "Modifed concrete"

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Klun, Mateja, Jakob Šušteršič, Rok Ercegovič, Matjaž Mikoš, and Andrej Kryžanowski. "Underwater Abrasion Resistance of Fibre Reinforced-Latex Modified Concrete with Granulated Rubber." In Springer Proceedings in Materials. Springer Nature Switzerland, 2024. http://dx.doi.org/10.1007/978-3-031-72955-3_49.

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AbstractIn this paper, we present and discuss the initial results of a large-scale research project involving laboratory and field investigations of abrasion resistance of different types of concrete. The decision to study in more detail the abrasion resistance of fibre-reinforced concrete with granulated rubber was based on the results of previous research projects, as well as on observations on the behaviour of concretes placed in the spillways of hydro power plants loaded with water and water-borne particles. Gravel aggregate, steel, polypropylene fibres, and granulated rubber were used to prepare the concrete. In the fibre-reinforced concretes without granulated rubber, the binding component consisted of cement and silica fume, but when granulated rubber was added, the binding component consisted of cement and a dry proportion of SBR latex. The results obtained by now, at an age of 90 days show that fibre-reinforced concretes with granulated rubber have an improved resistance to underwater abrasion, compared to fibre-reinforced concretes without granulated rubber.
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Said, Aly M., and Oscar Quiroz. "Innovative Polymer-Modified Pervious Concrete." In International Congress on Polymers in Concrete (ICPIC 2018). Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-78175-4_29.

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Młodecki, J. "Adhesion Forces of Polymer Modified Concrete and Plain Concrete to Steel in Moulds and in Reinforced Concretes." In Adhesion between polymers and concrete / Adhésion entre polymères et béton. Springer US, 1986. http://dx.doi.org/10.1007/978-1-4899-3454-3_6.

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Feng, J., and S. Qian. "Nanosilica-Modified Hydrogels Encapsulating Bacterial Spores for Self-healing Concrete." In Lecture Notes in Civil Engineering. Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-3330-3_9.

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AbstractMicrobially induced calcium carbonate precipitation is effective in achieving self-healing of concrete cracks when the bacteria are well protected in concrete with a high pH and dense microstructure. Calcium alginate hydrogels are appropriate for encapsulating bacteria in concrete due to the mild environment with rich moisture in the hydrogels. Nevertheless, the low alkaline tolerance and breakage ratios of the hydrogels after concrete cracking restrict their applications in concrete. To address these problems, nanosilica was doped into calcium alginate hydrogels with encapsulated bacterial spores to react with the Ca(OH)2 surrounding hydrogels in concrete. Due to the modification by nanosilica, the bond of the hydrogels with cement matrix was enhanced as needle-like C–S–H was generated at the interface after hydration for 7 days. Moreover, the urease activity of the encapsulated spores in the modified hydrogels was higher than that in plain hydrogels after submersion in saturated Ca(OH)2 solution or simulated concrete solution for 7 days. Therefore, it can be concluded that nanosilica holds promise for modifying hydrogels to improve the effectiveness of encapsulated bacterial spores for self-healing of concrete.
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Pozniak, Oksana, Uliana Marushchak, and Andriy Melnyk. "Modified Concretes Containing Peat Ash." In Lecture Notes in Civil Engineering. Springer Nature Switzerland, 2024. http://dx.doi.org/10.1007/978-3-031-67576-8_39.

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Lal, Punya, and P. E. Kavitha. "Modified Magnetized Water Concrete Using Nanosilica." In Lecture Notes in Civil Engineering. Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-55115-5_40.

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Baral, Tapas Ranjan, Sujit Kumar Pradhan, and Debakinandan Naik. "Latex Modified Steel Fiber Reinforced Concrete." In Industry 4.0 with Modern Technology. CRC Press, 2024. http://dx.doi.org/10.1201/9781003450924-58.

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Chen, Qiang, Wei Xu, Yongjian Li, et al. "Research on Gyratory Compaction Characteristics of Low Void Modified Asphalt Concrete Materials." In Lecture Notes in Civil Engineering. Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-97-5814-2_9.

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AbstractThe compaction characteristics of asphalt concrete materials have a decisive impact on the degree of field compaction. Therefore, the study of the compacting law of composite modified asphalt mixture has important guiding significance for the field construction of pavement. This study used a gyratory compactor (SGC) to analyze the compaction characteristics of composite modified asphalt concrete materials from the two dimensions of asphalt-aggregate ratio and gradation. The test added 10% PE modifier by mass of asphalt and 0.2% polymer fiber. The compaction characteristics of LA-10 (low-void asphalt concrete materials), SMA-10, and AC-10 gradations under asphalt-aggregate ratio of 7.5%, 8.0%, and 8.5% were studied and compared with the compaction situation of the commonly used EA-10 for steel bridge deck pavement. The results showed that with changes in the asphalt-aggregate ratio, the trend of the mixture voidage and compaction curve was consistent. The LA-10 mixture reached the target voidage range at an asphalt-aggregate ratio of 7.5%, with good workability, while the AC-10 and SMA-10 mixtures reached the target voidage range at an asphalt-aggregate ratio of 8.0%, and were easier to compact. The compaction density energy index was SMA-10 &gt; AC-10 &gt; LA-10 &gt; EA-10, and the compaction ease of LA-10 was relatively close to that of epoxy asphalt mixture EA-10. According to the above compaction characteristics, LA-10 is suitable for the lower layer of pavement, and SMA-10 and AC-10 are suitable for the upper layer of pavement.
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Chen, Yunkai, Peng Deng, and Yao Wang. "Experimental and Analyses on the Deterioration of Mechanical Properties of Transport Bridges Based on Hot and Humid Marine Environment." In Lecture Notes in Civil Engineering. Springer Nature Singapore, 2024. https://doi.org/10.1007/978-981-97-6238-5_3.

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AbstractThe mechanical properties of in-service concrete bridges in the sea are subject to accelerated deterioration due to the harsh environment in which they are located, which poses a serious challenge to bridge transportation work. Therefore, it is necessary to analyse and study the mechanical property evolution of lightweight aggregate concrete in the marine environment and transport engineering design. In order to study the mechanical property degradation law of nano-modified ceramic concrete under the action of dry and wet cycles and temperature, tests were conducted on nano-modified ceramic concrete specimens at different temperatures (30 °C, 40 °C, 50 °C) and different numbers of dry and wet cycles (15, 45, 75), respectively. The test results showed that with the increase of the number of cycles, the change of compressive strength showed a typical three-phase law, while the split tensile strength showed the law of deterioration, strengthening, and then deterioration. With the increase of temperature, the compressive strength increases and then decreases, while the splitting tensile strength decreases continuously, and the decrease is greater. Under the combined effect of the two factors, three damage modes of compressive and split tensile were analysed. Finally, the uniaxial compression constitutive model and the formula for the attenuation change of mechanical properties of nano-modified ceramic concrete were fitted based on the test data under dry and wet cycles and temperature.
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Urbański, Marek, Elżbieta Szmigiera, Grzegorz Adamczewski, Piotr P. Woyciechowski, and Kostiantyn Protchenko. "Bond Characteristics of BFRP and GFRP Bars in Concrete with Additives—Results from a Beam Test Study." In Springer Proceedings in Materials. Springer Nature Switzerland, 2024. http://dx.doi.org/10.1007/978-3-031-72955-3_41.

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AbstractThis article presents a comparative analysis of the bond behavior of steel bars in concrete and bars made of basalt fiber-reinforced polymer (BFRP) and glass fiber-reinforced polymer (GFRP) in modified concrete. While steel bars have been the conventional choice for reinforcement in concrete structures, their bonding properties are well established. In contrast, FRP bars possess distinct mechanical and physical properties, which can lead to different bonding behavior in concrete. The study investigated the effects of concrete properties and bar characteristics on the bond behavior of GFRP and BFRP bars. Specifically, the study analyzed the relationships between bond stress-slip, modes and mechanisms of failure, and changes in bond strength of concrete with the addition of zeolite and metakaolin, with the presence of GFRP, BFRP, and steel bars. The findings of the study reveal that the adhesion of composite bars to modified concrete is enhanced to varying degrees. The bond stress of GFRP bars to concrete with metakaolin addition was found to be 50% higher than to normal concrete, while the bond stress to concrete with zeolite was similar. On the other hand, BFRP bars exhibited an increase in bond stress of 7% in the presence of concrete with metakaolin. Moreover, BFRP bars displayed a greater bond to steel reinforcement that underwent plasticization or rupture. The study also noted that the change in bond strength of GFRP and BFRP bars due to their linear deformability was gradual, characterized by a several times greater slip range compared to steel bars.
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Conference papers on the topic "Modifed concrete"

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Souza, João Paulo Marçal de, JESSICA DUARTE RIBEIRO VIEIRA, FABIANA ARAUJO MAIA, et al. "MODIFICAÇÃO DE CONCRETOS ASFÁLTICOS DRENANTES NA INDÚSTRIA DA PAVIMENTAÇÃO: UM ESTUDO BIBLIOMÉTRICO." In Anais da 49ª Reunião Anual de Pavimentação - RAPv. Even3, 2024. http://dx.doi.org/10.29327/1430212.49-60.

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Com o aumento do crescimento urbano nas últimas décadas, a expansão das áreas impermeáveis tornou-se uma consequência evidente. Nessa perspectiva, estudos recentes na área da pavimentação focaram em dispositivos para promover infiltração e retardar o escoamento superficial, como o pavimento de concreto asfáltico poroso, que facilita a drenagem sob o pavimento. Tendo em vista a importância das estratégias tecnológicas para a indústria da pavimentação, este estudo teve como objetivo a análise bibliométrica das publicações sobre novos materiais na pavimentação asfáltica drenante utilizando a base de dados Scopus. As análises bibliométricas aplicaram-se para conhecer a evolução e produção científica, além das tendências e domínios de conhecimento. Para a pesquisa dos documentos foram utilizados os termos em inglês “modified asphalt” and “modified asphalt concrete” or CPA or "cement replacement" or recycle or sustainab or “open graded asphalt” e considerados os artigos do período de 2000 a 2024. Os resultados revelaram o aumento das publicações com o passar dos anos, enfocando áreas específicas, materiais e países mais ativos. Houve um crescimento constante nas publicações ao longo do tempo, com destaque para a China como líder em pesquisas. Os estudos destacaram os testes de desempenho e a busca por alternativas sustentáveis, como borracha de pneus e fibras de vidro, substituindo materiais convencionais no concreto asfáltico permeável.
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Cheytani, Martin, and Sammy Lap Ip Chan. "The Effect of Long-Term Exposure Conditions on the Concrete Resistivity of Polymer-Modified Concrete Repair Mortars." In CONFERENCE 2023. AMPP, 2023. https://doi.org/10.5006/c2023-18842.

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Abstract Polymer-modified cementitious repair mortars have been used extensively in recent years for concrete repairs in conjunction with electrochemical protection systems. The performance improvements of polymer additions to cementitious mortars generally come at the expense of increased mortar resistivity, an important consideration in the selection of repair mortars particularly when used in conjunction with electrochemical protection systems, such as impressed current cathodic protection and galvanic anode systems. In this paper, four-point Wenner probe resistivity tests of four commercially available mortars marketed as ‘low resistivity’ polymer-modified repair mortars were carried out over a period of 18 months. The experiment results indicated substantial increases in resistivity over time for all mortars in saturated and outdoor exposure conditions, which were beyond the short-term resistivity data of 28 days presented in manufacturers’ technical data sheets and perceived to be the long-term maximum mortar resistivity. The outcome of this paper suggests that polymer-modified mortar resistivity increases substantially over time. The increase of the repair mortar resistivity when used in conjunction with electrochemical protection systems may have a considerable impact on the performance of these systems.
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Pickard, Scott S. "Sulphur Concrete Applications in Industry." In CORROSION 1985. NACE International, 1985. https://doi.org/10.5006/c1985-85202.

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Abstract ABSTRACT Sulphur concrete has the potential to solve some serious industry corrosion problems. This paper gives a general background of sulphur concrete, including its basic characteristics, cost effective applications and state-of-the-art construction techniques. Because sulphur concrete is only as good as the materials techniques and equipment used to produce the product, the following items are extremely important when designing and constructing with sulphur concrete: modified sulphur and aggregates; design details and testing of materials; preparation of existing surface/subbase; batching, transporting, placing and finishing; and joint design.
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Bolzoni, Fabio, Marco Ormellese, and Andrea Brenna. "Efficiency of Concrete Coatings on Chloride-induced Corrosion of Reinforced Concrete Structures." In CORROSION 2011. NACE International, 2011. https://doi.org/10.5006/c2011-11001.

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Abstract Concrete coatings are widely used to improve durability of new structures, as well as in rehabilitation, in order to protect reinforcement against chloride-induced corrosion. Organic and polymer modified cementitious mortars applied on concrete surface in chloride containing environment were studied with five year long tests. Coatings have been tested on concrete with two water/cement ratios. The effect of the coatings on time-to-corrosion has been studied by the monitoring of the corrosion behaviour of reinforced concrete specimens subjected to chloride ponding: corrosion potential, corrosion rate and chloride profiles have been carried out. Results have been elaborated to estimate the chloride diffusion coefficient of the tested coatings. Data have been used to predict the effect of the coatings on the service life of reinforced concrete structures subjected to chloride corrosion by using analytical solution of the 2nd Fick’s law of non-stationary diffusion derived from an analogy with heat transfer law (Fourier’s law).
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Sohanghpurwala, Ali Akbar, William T. Scannell, and Anthony LaConti. "Improvement in Graphite Reference Cell for Reinforced Concrete." In CORROSION 1994. NACE International, 1994. https://doi.org/10.5006/c1994-94307.

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Abstract The primary objective of this research was to investigate the feasibility of developing an improved, more reproducible, reversible and highly voltage invariant reference half-cell for monitoring and controlling cathodic protection systems on pre-stressed concrete structures. The performance of various standard and experimental modified graphite electrodes was compared to the best commercially available and other recently developed embeddable reference cells in salt contaminated concrete under severe cyclic temperature conditions. It was found that selected modifications of base graphite can produce a stable and reproducible reference electrode which is simple to manufacture, rugged to handle and cost effective. The performance of modified graphite electrodes approached that of the best commercial reference electrodes currently on the market. This was the first attempt at modifying graphite for use as an embedded reference electrode and optimization of materials and modification procedures is presently ongoing.
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Mazurek, Grzegorz. "The Viscoelastic Characteristics of the Asphalt Concrete Modified with Different Synthetic Waxes Using a Modified Huet- Sayegh Model." In Environmental Engineering. VGTU Technika, 2017. http://dx.doi.org/10.3846/enviro.2017.141.

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The article presents the results of dynamic modulus tests carried on the asphalt concrete (AC16W). The sinusoidal load was applied to the samples in accordance with DTC-CY method. The neat bituminous binder (penetration grade 35/50) was modified by means two synthetic waxes, coming from the Fischer-Tropsch raction, with various molecular weights and softening point temperature results (hard and softer). The relaxation phenomenon in terms of changes in complex modulus and phase angle was evaluated using the modified Huet-Sayegh (2S2P1D). Estimated model parameters pointed out that the addition of the synthetic wax with the high (hard wax) and the low (softer wax) molecular weight raised the stiffness of the bituminous binder in relation to the reference bitumen 35/50. The application of the modified Huet-Sayegh model showed that the presence of the synthetic wax in the bitumen significantly affected the stiffness modulus of considered asphalt concretes. Basing analysis on Cole-Cole diagram it was found significant differences in the viscoelastic behaviour between the reference asphalt concrete and the asphalt concretes with synthetic waxes. In contrast, there were no significant differences between viscoelastic properties of tested asphalt concretes modified, used in the experiment, synthetic waxes. Furthermore, the sensitivity to the loading time of asphalt concretes containing both synthetic waxes was marginal.
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Zimich, Vita. "Investigation of modified asphalt concrete." In ADVANCED MATERIALS IN TECHNOLOGY AND CONSTRUCTION (AMTC-2015): Proceedings of the II All-Russian Scientific Conference of Young Scientists “Advanced Materials in Technology and Construction”. AIP Publishing LLC, 2016. http://dx.doi.org/10.1063/1.4937870.

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Flores Soto, Luis Adrian, Fabio Velarde Safra, and Pablo Jhoel Peña Torres. "Modified Model of Prediction of Carbonation Depth Based on CEB-FIP for Concrete with Portland Cement with High Water-Cement Ratios." In International Conference on Advanced Materials, Mechanics and Structural Engineering. Trans Tech Publications Ltd, 2024. http://dx.doi.org/10.4028/p-wahe3m.

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CO2 levels in the world are constantly increasing and have generated a great impact on reinforced concrete structures causing increased carbonation. The phenomenon of carbonation causes corrosion of the reinforcing steel, therefore, reinforced concrete structures present a high risk of corrosion of its reinforcing steel causing the reduction of the useful life of the structure, or in extreme cases, a demolition must be carried out. The objective of the present study is to propose a prediction model for carbonation depth in pure concretes which are not designed for durability (w/c&lt;0.50), but when they are designed for resistance (w/c&gt;0.55). CEB-FIP model presents the limit of serving only for concrete with w/c&lt;0.50, due to this, the present study proposes a model that will help as a reference to estimate the useful life of structures that are built and designed in cities where they do not are exposed to these durability conditions. The modified model for predicting the carbonation depth based on CEB-FIP in pure concrete with high w/c (0.60 and 0.72) uses the parameters of temperature, relative humidity, CO2 concentration, and water/cement ratio. The objective is to obtain the accuracy of the modified model for predicting the carbonation depth in concrete over the years. For the results, the theoretical data obtained from the modified model was used and a comparison was made with the experimental results obtained from concrete specimens tested inside an accelerated carbonation chamber to find the model's accuracy.
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"The MODIFIED COMPRESSION FIELD THEORY: THEN AND NOW." In SP-328: Shear in Structural Concrete. American Concrete Institute, 2018. http://dx.doi.org/10.14359/51711147.

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Sif, Mohamed Abou, Mariyana Aida Ab Kadir, Musa Mohammed, et al. "Impact of metakaolin and crumb rubber on fire resistance of concrete bricks." In International Conference on Fire Safety Engineering Research and Practice. Science Technology and Management Crescent Australia, 2024. https://doi.org/10.71427/icfserp2024/19.

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It is hypothesized that the inclusion of metakaolin (MK) improved the thermal stability of the concrete by refining its microstructure and reducing its thermal conductivity. Conversely, crumb rubber (CR) is anticipated to impart increased flexibility and energy absorption capacity, potentially enhancing the concrete's resilience under thermal stress. Limited studies have explored the combined effects of metakaolin and crumb rubber on the mechanical and thermal properties of fire-damaged concrete bricks. This study aims to investigate the impact of incorporating these materials into concrete bricks on their fire resistance properties. Metakaolin is incorporated at a constant rate of 10%, while crumb rubber is varied at 5%, 10%, and 15% by weight in brick mix design. The thermal behaviour and structural integrity of the modified bricks mix design when subjected to intense fire exposure for durations of 1 and 2 hours. Expected outcomes include demonstrable improvements in fire resistance, with the modified bricks showing superior performance in terms of lower heat transfer rates and enhanced structural integrity compared to conventional concrete bricks. The findings from this research are intended to contribute to the broader field of construction materials science by providing insights into the potential of metakaolin and crumb rubber as functional additives for developing more durable and fire-resistant concrete formulations.
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Reports on the topic "Modifed concrete"

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Diamond, Sidney, and Qizhong Sheng. Laboratory Investigations on Latex-Modified Concrete. Purdue University, 1989. http://dx.doi.org/10.5703/1288284314174.

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Diamond, Sidney. Investigation on Latex-Modified Bridge Deck Overlay Concrete. Purdue University, 1987. http://dx.doi.org/10.5703/1288284314130.

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Diamond, Sidney, and Qizhong Sheng. Laboratory Investigations on Latex-Modified Concrete : Executive Summary. Purdue University, 1989. http://dx.doi.org/10.5703/1288284314175.

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Sanchez, Florence, David Kosson, Kevin Brown, et al. Development of Nano-Modified Concrete for Next Generation of Storage Systems. Office of Scientific and Technical Information (OSTI), 2018. http://dx.doi.org/10.2172/1469196.

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Deichert, Geoffrey G., Kory D. Linton, Kurt A. Terrani, Aaron P. Selby, and Yonathan Reches. Vanderbilt University Gamma Irradiation of Nano-modified Concrete (2017 Milestone Report). Office of Scientific and Technical Information (OSTI), 2017. http://dx.doi.org/10.2172/1399942.

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He, Rui, Na (Luna) Lu, and Jan Olek. Development of In-Situ Sensing Method for the Monitoring of Water-Cement (w/c) Values and the Effectiveness of Curing Concrete. Purdue University, 2022. http://dx.doi.org/10.5703/1288284317377.

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As the most widely used construction material, concrete is very durable and can provide long service life without extensive maintenance. The strength and durability of concrete are primarily influenced by the initial water-cement ratio value (w/c), and the curing condition during the hardening process also influences its performance. The w/c value is defined as the total mass of free water that can be consumed by hydration divided by the total mass of cement and any additional pozzolanic material such as fly ash, slag, silica fume. Once placed, field concrete pavements are routinely cured with liquid membrane-forming compounds. For laboratory study, concrete samples are usually cured in saturated lime water or a curing room with a relative humidity (RH) value higher than 95%. Thus, the effectiveness of curing compounds for field concrete needs to be studied. In this study, the dielectric constant value of plastic concrete was measured by ground penetrating radar (GPR). The w/c value of the plastic concrete was calculated by a mathematical model from the measured dielectric constant value. The calculated w/c value was compared with the microwave oven drying measurement determined result in AASHTO T318. A modified coarse aggregate correction factor was proposed and applied in microwave oven drying measurement to determine the w/c value of plastic concrete in AASHTO T318. The effectiveness of curing compound was evaluated by field concrete slabs by GPR measurement. It was found that GPR can be a promising NDT method for In this study, the dielectric constant value of plastic concrete was measured by ground penetrating radar (GPR). The w/c value of the plastic concrete was calculated by a mathematical model from the measured dielectric constant value. The calculated w/c value was compared with the microwave oven drying measurement determined result in AASHTO T318. A modified coarse aggregate correction factor was proposed and applied in microwave oven drying measurement to determine the w/c value of plastic concrete in AASHTO T318. The effectiveness of curing compound was evaluated by field concrete slabs by GPR measurement. It was found that GPR can be a promising NDT method for w/c determination of plastic concrete and curing effectiveness evaluation method for hardened concrete.
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Knab, L. I., M. M. Sprinkel, and O. J. Jr Lane. Preliminary performance criteria for the bond of Portland-cement and latex-modified concrete overlays. National Institute of Standards and Technology, 1989. http://dx.doi.org/10.6028/nist.ir.89-4156.

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Behnood, Ali, and Jan Olek. Development of Subgrade Stabilization and Slab Undersealing Solutions for PCC Pavements Restoration and Repairs. Purdue University, 2020. http://dx.doi.org/10.5703/1288284317128.

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The loss of functionality and the development of distress in concrete pavements is often attributable to the poor subbase and subgrade conditions and/or loss of support due to the development of the voids underneath the slab. Subgrade soil stabilization can be used as an effective approach to restore the functionality of the subgrades in patching projects. This research had two main objectives: (1) identifying the best practices for soil stabilization of the existing subgrade during pavement patching operations and (2) identifying and developing new, modified grouting materials for slab stabilization and undersealing. Various stabilization scenarios were tested and showed improved performance of the subgrade layer. The use of geotextile along with aggregate course was found to significantly reduce the settlement. Non-removable flowable fill was also found to significantly reduce the subgrade settlement. Cement-treated aggregate and lean concrete provided the best performance, as they prevented formation of any noticeable settlement in the underlying subgrade.
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Baten, Bayezid, Matthew Gombeda, and Nishant Garg. Utilizing a Particle-packing Approach for an Illinois-specific, Nonproprietary, Low-shrinkage UHPC. Illinois Center for Transportation, 2024. http://dx.doi.org/10.36501/0197-9191/24-021.

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Ultra-high-performance concrete (UHPC) represents the next generation of concrete, with a strength 3-4 times greater than traditional concrete (100-120 MPa as opposed to 30-40 MPa). However, most of the commercial UHPC mixes are proprietary and expensive. In this project, we document the development of nonproprietary, cost-effective UHPC mixes primarily using locally sourced or pre-qualified materials in Illinois. The research utilizes the modified Anderson and Andreasen packing model to establish a new parameter: “packing factor” that has a significant influence on the design and performance of multi-binder UHPC mixes. Initially, 19 UHPC mixes without fibers are analyzed for their rheological, mechanical, and durability properties, demonstrating promising results. Specifically, we obtain self-flowing capabilities with minimal HRWR usage (&lt;1% by wt.%), a turnover time of 7–10 minutes, and a significant reduction in cement content (47% Type IL and the remaining 53% SCMs by volume) while maintaining superior compressive strengths (~120–150 MPa, 17.2–21.8 ksi @ 28 days). Then, optimal mixes, particularly M18 and M19, are evaluated with fibers, achieving compressive strengths exceeding 150 MPa (21.8 ksi) at 28 days and exhibiting open porosity under 2%, and have shrinkage rates below the target threshold (&lt;800µξ @ 91 days). Finally, effective particle packing resulted in UHPC mixes costs of ~$400/m3 (~$308/yd3) without steel fibers and ~$590/m3 (~$454/yd3) with steel fibers, enabling cost-effective, optimal UHPC for deployment by the Illinois Department of Transportation.
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Gombeda, Matthew, Zoe Lallas, and Estevan Rivera Jr. Optimal Approach for Addressing Reinforcement Corrosion for Concrete Bridge Decks in Illinois—Phase II. Illinois Center for Transportation, 2023. http://dx.doi.org/10.36501/0197-9191/23-005.

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This report presents the expansion of a previously introduced life-cycle cost calculation framework for concrete bridge decks in Illinois. In addition to the alternative reinforcement options examined in the Illinois Center for Transportation and Illinois Department of Transportation project R27-SP49, two additional reinforcing bar types—stainless steel–clad carbon core and textured epoxy-coated bars—are the main subjects of this study. The results of a comprehensive literature review of these two additional bar options will highlight their cost-benefit characteristics toward optimizing the life span of a concrete bridge deck, most notably trade-offs between often increased upfront material costs and enhanced durability over a design 100-year service life. Additionally, the scope of this study includes the development of a more robust methodology to account for the effect of the relatively high nominal yield strength and corresponding reduced ductility of A1035 bars, one of the alternate reinforcement options examined in R27-SP49. The researchers used a numerical moment-curvature-based analysis methodology to facilitate the development of a design-friendly modified high-strength reinforcement factor that supersedes the nominal yield strength factor proposed in the original version of the life-cycle cost framework. The outcomes of this project and R27-SP49 will collectively expand upon and aim to enhance the effectiveness of the originally proposed life-cycle cost framework. The outcomes will be demonstrated by presenting updated life-cycle costs and via a parametric study of two hypothetical bridge deck examples, each falling into significantly different categories for traffic demands and select performance expectations.
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