Relevant bibliographies by topics / Structural Lightweight Concrete

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Academic literature on the topic 'Structural Lightweight Concrete'

Author: Grafiati
Published: 4 June 2021
Last updated: 15 February 2022

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Journal articles on the topic "Structural Lightweight Concrete"

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Wongkvanklom, Athika, Patcharapol Posi, Banlang Khotsopha, Chetsada Ketmala, Natdanai Pluemsud, Surasit Lertnimoolchai, and Prinya Chindaprasirt. "Structural Lightweight Concrete Containing Recycled Lightweight Concrete Aggregate." KSCE Journal of Civil Engineering 22, no. 8 (November 15, 2017): 3077–84. http://dx.doi.org/10.1007/s12205-017-0612-z.

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Khoshvatan, Mehdi, and Majid Pouraminia. "The Effects of Additives to Lightweight Aggregate on the Mechanical Properties of Structural Lightweight Aggregate Concrete." Civil and Environmental Engineering Reports 31, no. 1 (March 1, 2021): 139–60. http://dx.doi.org/10.2478/ceer-2021-0010.

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Abstract In the paper, the effects of different percentages of additives (perlite, LECA, pumice) on the mechanical properties of structural lightweight aggregate concrete were tested and evaluated. For the research, 14 mixing designs with different amounts of aggregate, water, and cement were made. Experimental results showed that the specific gravity of lightweight structural concrete made from a mixture of LECA, pumice, and perlite aggregates could be 25-30% lighter than conventional concrete. Lightweight structural concrete with a standard specific gravity can be achieved by using a combination of light LECA with perlite lightweight aggregates (LA) and pumice with perlite in concrete. The results indicated that LECA lightweight aggregates show more effective behavior in the concrete sample. Also, the amount of cement had a direct effect on increasing the strength regardless of the composition of LAs. The amount of cement causes compressive strength to increase. Furthermore, the stability of different experimental models increased from 156 to 345 kg m 3 while increasing the amount of cement from 300 to 400 kg m 3 in the mixing designs of LECA and perlite for W/C ratios of 0.3, 0.35, and 0.4. For a fixed amount of cement equal to 300 kg, the compressive strength is reduced by 4% by changing the water to cement ratio from 0.5 to 0.4. The compression ratios of strength for 7 to 28 days obtained in this study for lightweight concrete were between 0.67-0.8. Based on the rate of tensile strength to compressive strength of ordinary concretes, which is approximately 10, this ratio is about 13.5 to-17.8 in selected and optimal lightweight concretes in this research, which can be considered good indirect tensile strength for structural lightweight concretes.
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Aslam, Muhammad, Payam Shafigh, and Mohd Zamin Jumaat. "Structural Lightweight Aggregate Concrete by Incorporating Solid Wastes as Coarse Lightweight Aggregate." Applied Mechanics and Materials 749 (April 2015): 337–42. http://dx.doi.org/10.4028/www.scientific.net/amm.749.337.

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Structural lightweight aggregate concrete offers several benefits as compared to the normal weight concrete. Most common methods of producing structural lightweight concrete is by using artificial lightweight aggregates. However, the cost of the production of artificial lightweight aggregates is high due to energy and raw materials consumption. The use of waste and by-product materials as lightweight aggregate in concrete can provide a better solution to reducing the negative impact of the concrete industry. This paper reports an investigation to produce structural lightweight aggregate concrete by utilizing the locally available solid waste materials, namely oil palm shell (OPS) and oil-palm-boiler clinkers (OPBC) as coarse lightweight aggregates. Two different mix proportions were studied. In the first concrete mix, just OPS was used as coarse aggregate. However, 40% of OPS (by volume) of the first mix was replaced with OPBC in the second mix. The test results showed that by replacing OPS with OPBC, it directly affects the characteristics of the lightweight concrete. The 28-days compressive strength of the blended coarse lightweight aggregate concrete was significantly increased compared to OPS concrete.
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Domagała, Lucyna. "Durability of Structural Lightweight Concrete with Sintered Fly Ash Aggregate." Materials 13, no. 20 (October 14, 2020): 4565. http://dx.doi.org/10.3390/ma13204565.

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The aim of this study was to present the problem of durability of structural lightweight concrete made of a sintered fly ash aggregate. The issue of durability was researched for 12 concrete series in terms of their water absorption, water permeability, and freeze-thaw resistance. Additionally, the microstructure of several concretes was analyzed with a scanning electron microscope (SEM). In the durability research, the influences of the following parameters were taken into consideration: The initial moisture content of sintered fly ash (mc = 0, 17–18, and 24–25%); the aggregate grading (4/8 and 6/12 mm); and the water-cement ratio (w/c = 0.55 and 0.37). As a result of various compositions, the concretes revealed different properties. The density ranged from 1470 to 1920 kg/m3, and the corresponding strength ranged from 25.0 to 83.5 MPa. The durability research results of tested lightweight concretes showed that, despite considerably higher water absorption, a comparable water permeability and comparable or better freeze-thaw resistance in relation to normal-weight concrete may be present. Nevertheless, the fundamental requirement of lightweight concrete to achieve good durability requires the aggregate’s initial moisture content to be limited and a sufficiently tight cement matrix to be selected. The volume share of the cement matrix and aggregate, the cement content, and even the concrete strength are of secondary importance.
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Ozyildirim, H. Celik, and Harikrishnan Nair. "Durable Concrete Overlays in Two Virginia Bridges." Transportation Research Record: Journal of the Transportation Research Board 2672, no. 27 (June 11, 2018): 78–87. http://dx.doi.org/10.1177/0361198118777606.

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The purpose of this study was to implement innovative concretes with low permeability and reduced cracking potential in overlays to reduce chloride infiltration into the bridge decks. Two parallel bridges on Route 64 over Dunlap Creek in Alleghany County, Virginia, were selected for this study. For low cracking potential, relatively low water contents, shrinkage reducing admixtures, and lightweight aggregates were used. For low permeability, concretes had supplementary cementitious material and relatively low water–cementitious material ratios. In the overlays, five different materials were used: latex-modified concrete with rapid set cement; silica fume concrete alone; and silica fume concrete with shrinkage reducing admixture, lightweight coarse aggregate, and partial lightweight fine aggregate. A compressive strength of 3,000 psi at 3 days was sought. The performance of the overlay concretes was observed after two to three winters. The overlays used in this study achieved the specified strength and low permeability. There were minimal tight cracks except for one section with the latex-modified concrete with rapid set cement in the left lane of the westbound bridge. The extensive cracks in that section were attributed to plastic shrinkage from adverse weather conditions at placement and the fact that a truck had caught fire in that lane. Silica fume concrete overlays with shrinkage reducing admixture, lightweight coarse aggregate, or lightweight fine aggregate are ready for implementation in the field for low cracking overlays.
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Bodnárová, Lenka, Jitka Peterková, Jiri Zach, and Kateřina Sovová. "Determination of Thermal Conductivity on Lightweight Concretes." Key Engineering Materials 677 (January 2016): 163–68. http://dx.doi.org/10.4028/www.scientific.net/kem.677.163.

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A range of testing methods were used to study the potential structural changes as a result of the effects of high temperatures on lightweight types of concrete developed above all for fire resistant structures. One such test for monitoring changes in concrete structures is the non-stationary determination of the coefficient of thermal conductivity using the hot wire method. The matrix structure progressively collapses as a result of the effects of high temperatures on the concrete structure ́s surface because erosion takes place of the matrix and aggregate porous structures. The degradation of the porosity of the concrete results in the deterioration of its thermal insulating properties. This paper assesses the dependence of the thermal conductivity coefficient of lightweight concretes on temperature and determines the potential occurrence of structural changes in the lightweight concrete matrix. The results were verified using other methods to determine the concrete ́s resistance to thermal load.
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Thienel, Karl-Christian, Timo Haller, and Nancy Beuntner. "Lightweight Concrete—From Basics to Innovations." Materials 13, no. 5 (March 3, 2020): 1120. http://dx.doi.org/10.3390/ma13051120.

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Lightweight concrete has a history of more than two-thousand years and its technical development is still proceeding. This review starts with a retrospective that gives an idea of the wide range of applications covered by lightweight concrete during the last century. Although lightweight concrete is well known and has proven its technical potential in a wide range of applications over the past decades, there are still hesitations and uncertainties in practice. For that reason, lightweight aggregate properties and the various types of lightweight concrete are discussed in detail with a special focus on current standards. The review is based on a background of 25 years of practical and theoretical experience in this field. One of the main challenges in designing lightweight concrete is to adapt most of design, production and execution rules since they often deviate from normal weight concrete. Therefore, aspects are highlighted that often are the cause of misunderstandings, such as nomenclature or the informational value of certain tests. Frequently occurring problems regarding the mix design and production of lightweight concrete are addressed and the unintended consequences are described. A critical view is provided on some information given in existing European concrete standards regarding the mechanical properties of structural lightweight concrete. Finally, the latest stage of development of very light lightweight concretes is presented. Infra-lightweight concrete is introduced as an innovative approach for further extending the range of applications of lightweight concrete by providing background knowledge and experiences from case records.
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Hoang Minh, Duc, and Ly Le Phuong. "Effect of matrix particle size on EPS lightweight concrete properties." MATEC Web of Conferences 251 (2018): 01027. http://dx.doi.org/10.1051/matecconf/201825101027.

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Expanded polystyrene lightweight concrete is a composite which can be made by adding expanded polystyrene aggregate in normalweight concrete (as matrix). The research was focused on the effect of properties and volume of the matrix on the properties of lightweight concrete. The results show that properties of structural polystyrene concrete, such as workability and compressive strength, depend on the aggregate size of the matrix. It also shows that decreasing aggregate size of the matrix is the effective way to increase workability and compressive strength of lightweight concrete. When the density of concretes decrease by 200 kg/m³, slump values decrease by about 20 to 30 mm with lightweight concrete mixtures using maximum particle size of 0.63 mm, while slump values decrease by about 40 mm with the mixtures using maximum particle size of 20 mm. At the same density, the compressive strength of the structural polystyrenre concrete significantly decreased when the coarse aggregate diameter greater than 10 mm. Therefore, coarse aggregates with diameter size are smaller than 10 mm was recommended to use for matrix. In the result, expanded polystyrene concrete with density from 1,400 kg/m³ to 2,000 kg/m³ and compressive strength more than 20 MPa for structural application was made.
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Medvedeva, G., and A. Lifant'eva A.F. "THE RESEARCH OF MULTILAYER OUTER FENCING INCLUDING MATERIALS USING ASH AND SLAG WASTE OF THERMAL POWER PLANTS." Construction Materials and Products 3, no. 2 (July 10, 2020): 29–35. http://dx.doi.org/10.34031/2618-7183-2020-3-2-29-35.

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the most important direction of resource saving in construction is the widespread use of secondary material resources, which are waste products. The use of secondary products of industry as raw materials for the production of various building materials is very important, because it provides production with rich sources of cheap and, often, already prepared raw materials; lead to lower costs for the production of some building materials, and therefore saves capital investments intended for the construction of buildings and structures; release large areas of land and reduce the impact on the environment. The article deals with heat-insulating and structural-heat-insulating materials, with partial replacement of components by ash-slag waste (ASW): lightweight concretes with broken glass and concretes modified with sulfur. Properties of concretes modified with sulfur are investigated: compressive strength, density and thermal conductivity. In accordance with the obtained properties, a comparative characteristics of the received materials with existing building materials was carried out: sulfur modified concrete and lightweight concrete; lightweight concrete using broken glass and claydite-concrete. Thermophysical calculation of multilayer hencing is made. In each of the options, one of the following materials was selected as a structural and heat-insulating material: lightweight concrete using broken glass and sulfur modified concrete. Also, for each type of hencing, the necessary heat-insulating and structural materials were selected. In the economic part, the cost of the raw materials necessary to obtain 1 m3 of the investigated materials and the cost of 1 m3 of multilayer hencing, which includes the investigated concrete, are calculated.
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Badar, Sajjad abdulameer, Laith Shakir Rasheed, and Shakir Ahmed Salih. "The Structural Characteristics of Lightweight Aggregate Concrete Beams." Journal of University of Babylon for Engineering Sciences 27, no. 2 (May 22, 2019): 64–73. http://dx.doi.org/10.29196/jubes.v27i2.2293.

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This paper aims to investigate the structural behavior of reinforced lightweight concrete beams. Attapulgite aggregate and crushed clay brick aggregate were used as coarse lightweight aggregate to produce structural lightweight aggregate concrete with 25 Mpa and 43.6 Mpa cube compressive strength and 1805 Kg/m3 and 1977 Kg/m3 oven dry density respectively. The result of reinforced lightweight concrete beams compared with reinforced normal weight concrete beams, which have 50.5 Mpa cylinder compressive strength and 2317 Kg/m3 oven dry density. For each type of concrete two reinforced concrete beams with (1200 mm length × 180 mm height × 140 mm width), one of them tested under symmetrical two-points load STPL (a/d = 2.2) and another one tested under one-point load OPL (a/d=3.3) at 28 days. The experimental program shows that a structural lightweight aggregate concrete can be produced by using Attapulgite aggregate with 25 MPa cube compressive strength and 1805 Kg/m3 oven dry density and by using crushed clay brick aggregate with 43.6 MPa cube compressive strength and 1977 Kg/m3 oven dry density. The weight of Attapulgite aggregate concrete and crushed clay bricks aggregate concrete beam specimens were lower than normal weight aggregate concrete beams by about 20.56% and 13.65% respectively at 28 days. As for the ultimate load capacities of beam specimens, the ultimate load of Attapulgite aggregate concrete beams tested under STPL were lower than that of crushed clay bricks aggregate concrete beams and normal weight aggregate concrete beams by about 4.85% and 5% respectively. While the ultimate load capacities of reinforced Attapulgite concrete beams tested under OPL were lower than that of reinforced crushed clay bricks aggregate concrete beams and reinforced normal weight aggregate concrete beams by about 10.3% and 10.5% respectively. Finally, Attapulgite aggregate concrete and crushed clay bricks aggregate concrete showed ductility and toughness less than that of Normal weight aggregate concrete.
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Dissertations / Theses on the topic "Structural Lightweight Concrete"

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Van, Rooyen Algurnon Steve. "Structural lightweight aerated concrete." Thesis, Stellenbosch : Stellenbosch University, 2013. http://hdl.handle.net/10019.1/80106.

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Thesis (MScEng)--Stellenbosch University, 2013.
Cellular concrete is a type of lightweight concrete that consists only of cement, water and sand with 20 per cent air by volume or more air entrained into the concrete. The two methods used for air entrainment in cellular concrete are (1) the use of an air entraining agent (AEA), and (2) the use of pre-formed foam. If pre-formed foam is used to entrain air into the concrete the concrete is named foamed concrete and if an AEA is used the concrete is termed aerated concrete. Depending on the type of application, structural or nonstructural, cellular concrete can be designed to have a density in the range of range of 400 to 1800 kg/m3. Non-structural applications of cellular concrete include void and trench filling, thermal and acoustic insulation. Structural applications of cellular concrete include pre-cast units such as concrete bricks, partitions, roof slabs etc. Due to the high levels of air in cellular concrete it is challenging to produce compressive strengths that are sufficient to classify the concrete as structurally useful when non-autoclaving curing conditions are used. The autoclaving process combines high temperature and pressure in the forming process, which causes higher strength and reduced shrinkage. This process is also limited to prefabricated units. Non-autoclave curing conditions include moist curing, dry curing, wrapping the concrete in plastic, etc. However, now that the world is moving in an energy efficient direction, ways to exclude energy-intensive autoclaving are sought. It has for instance been found that the utilisation of high volumes of fly-ash in cellular concrete leads to higher strengths which make it possible to classify the concrete as structurally useful. Now, that there is renewed interest in the structural applications of the concrete a design methodology using an arbitrary air entraining agent needs to be found. The research reported in this thesis therefore attempts to find such a methodology and to produce aerated concrete with a given density and strength that can be classified as structurally useful. For the mix design methodology, the following factors are investigated: water demand of the mix, water demand of the mix constituents, and the amount of AEA needed to produce aerated concrete with a certain density. The water demand of the mix depends on the mix constituents and therefore a method is proposed to calculate the water demand of the mix constituents based on the ASTM flow turn table. Due to the complex nature of air entrainment in concrete, the amount of air entrained into the concrete mix is not known beforehand, and a trial and error method therefore had to be developed. The trial mixes were conducted in a small bakery mixer. From the trial mixes estimated dosages of AEA were found and concrete mixes were designed based on these mixes. The factors that influence the mix design and strength of aerated concrete include filler/cement ratio (f/c), fly-ash/cement ratio (a/c) and design target density. Additional factors that influence the strength of aerated concrete are specimen size and shape, curing, and concrete age. It was found that the sand type and f/c ratio influence the water demand of the concrete mix. Sand type and f/c ratio also influence compressive strength, with higher strength for a finer sand type and lower f/c ratios. However, the concrete density is the factor that influences the strength the most.
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Arasteh, A. R. "Structural applications of lightweight aggregate foamed concrete." Thesis, University of Westminster, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.382269.

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Asik, Mesut. "Structural Lightweight Concrete With Natural Perlite Aggregate And Perlite Powder." Master's thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/12607728/index.pdf.

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Structural lightweight aggregate concrete is an important and versatile material, which offers a range of technical, economic and environmental-enhancing and preserving advantages and is designed to become a dominant material in the new millennium. For structural application of lightweight concrete, the density is often more important than the strength. A decreased density for the same strength level reduces the self-weight, foundation size and construction costs. Structural lightweight aggregate concrete generally used to reduce dead weight of structure as well as to reduce the risk of earthquake damages to a structure because the earthquake forces that will influence the civil engineering structures are proportional to the mass of those structures. In this study, structural lightweight aggregate concrete was designed with the use of natural perlite aggregate that will provide an advantage of reducing dead weight of structure and to obtain a more economical structural lightweight concrete by the use of perlite powder as a replacement of the cement. Six mixes were produced with different cement content and with or without perlite powder. Six mixes divided into two groups according to their cement content. First group had a cement content of 300 kg/m3 and second group had cement content of 500 kg/m3
also the water/cement ratios of groups were 0.49 and 0.35 respectively. Moreover, each group had three sub-mixes with 0%, 20% and 35% of perlite powder as cement replacement. According to results of experimental study, it was concluded that natural perlite aggregate can be used in the production of structural lightweight aggregate concrete. Based on the strength and density results of experimental work, it is possible to produce lightweight concrete with 20 MPa-40 MPa cylindrical compressive strength by using natural perlite aggregate. Also, the use of perlite powder, which will provide economy, can reduce dead weight further and increase performance.
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Cross, Benjamin Thomas. "Structural Performance of High Strength Lightweight Concrete Pretensioned Bridge Girders." Diss., Virginia Tech, 2012. http://hdl.handle.net/10919/26190.

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The use of high compressive strengths in prestressed bridge girders can lower costs by allowing for longer spans, increased girder spacing, and smaller cross-sections. If high strength lightweight concrete (HSLWC) is used, these advantages are further enhanced due to the corresponding reduction in self-weight. Additional benefits can then be realized in the form of more traffic lanes, increased load capacity, smaller substructures, reduced crane capacity requirements, and lower shipping costs. Despite the possible economic savings, HSLWC has been used infrequently in prestressed bridge girder applications across the nation. While recent research has been performed to extend the applicability of current bridge design specifications to normal weight concretes with strengths as high as 18 ksi, little has been done by comparison with regards to HSLWC. The purpose of the research in this report was to assess whether current bridge design specifications for transfer length, development length, prestress loss, camber, and flexural capacity are satisfactory for use with fully-bonded, pretensioned flexural members consisting of HSLWC and to make recommendations for improvements where necessary. Twelve high strength pretensioned beams of variable unit weight (eight lightweight beams and four normal weight beams) and strand size (eight beams with 0.5-in. strand and four beams with 0.6-in. strand) were cast at the Thomas M. Murray Structural Engineering Laboratory at Virginia Tech. These beams were allowed to sit for a period of several months after fabrication while measurements were taken regarding transfer length, prestress loss, and camber. After this period, the beams were load tested to collect development length data, flexural data, and further data related to prestress loss. In addition to the laboratory cast beams, prestress loss and camber data from six full-size bridge beams (five lightweight beams and one normal weight beam) cast as part of a separate project at Virginia Tech was examined. Analysis of the results for all beams shows that with a few caveats, the current AASHTO LRFD Specifications and other design methods examined regarding the topics under consideration are satisfactory for use in the design of HSLWC pretensioned bridge girders with properties similar to those of the beams studied.
Ph. D.
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El, Zareef Mohamed [Verfasser]. "Conceptual and Structural Design of Buildings made of Lightweight and Infra-Lightweight Concrete / Mohamed El Zareef." Aachen : Shaker, 2010. http://d-nb.info/1120864259/34.

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Zareef, Mohamed el [Verfasser]. "Conceptual and Structural Design of Buildings made of Lightweight and Infra-Lightweight Concrete / Mohamed El Zareef." Aachen : Shaker, 2010. http://nbn-resolving.de/urn:nbn:de:101:1-201612041611.

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Wu, Lixian. "Engineering and durability properties of high performance structural lightweight aggregate concrete." Thesis, University of Sheffield, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.265612.

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Sampaio, Zodinio Laurisa Monteiro. "Low cement structural lightweight concrete with optimized multiple waste mix design." PROGRAMA DE P?S-GRADUA??O EM CI?NCIA E ENGENHARIA DE MATERIAIS, 2017. https://repositorio.ufrn.br/jspui/handle/123456789/24353.

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The high-energy demand involved in the construction industry and the increasing consumption of concrete made this material an ideal option for the recycling of by-products from various industries such as: porcelain polishing residue (PPR); tire rubber residue (TRR) and limestone residue (LSR). These residues often lack a treatment that contributes to the degradation of the environment. In this sense, the use of by-products that increases the volume of the concrete without damaging significantly its properties, can be a viable option in the production of low-cost and sustainable low-weight concrete (LWC). The main objective of this work was to analyze the mechanical and thermal behavior of structural lightweight concrete (SLWC) with low cement consumption, produced with expanded clay (EC) in replacement of the aggregate and with the addition of PPR, TRR and LSR to replace the small aggregate. For this purpose, a 2? factorial design was used for the choice of SLWC with the best performance in terms of consistency, mechanical properties and density. Subsequently, reductions of 10, 20 and 30% of cement were performed on SLWC that presented better combination of properties and waste consumption and were characterized by mechanical tests. The best SLWC mix resulting from the combination of mechanical properties and cement consumption was characterized by permeability, flexural strength, TG/DTA, XRF, SEM, thermal capacity, thermal conductivity and thermal diffusivity. The results showed that residues contents around 21% presented better combination of properties. By maintaining the amount of residue at optimum levels it was possible to produce a SLWC with good rheological, mechanical and thermal properties with minimum cement consumption.
A alta demanda energ?tica envolvida na ind?stria da constru??o civil e o crescente consumo do concreto, fez com que o concreto se tornasse a op??o ideal para a reciclagem de subprodutos de v?rias industrias tais como: res?duo de polimento de porcelanato PPR; res?duo de borracha de pneu (TRR) e res?duo de pedra calc?ria (LSR). Esses res?duos frequentemente carecem de um tratamento adequando o que acaba contribuindo para a degrada??o do meio ambiente. Nesse sentido, o uso de subprodutos que ir?o aumentar o volume do concreto sem prejudicar muito as propriedades, pode ser uma op??o bastante vi?vel na produ??o de Concretos leves (CL) de baixo custo e sustent?veis. O objetivo geral desse trabalho foi analisar o comportamento mec?nico e t?rmico de concretos leves estruturais (CLE) de baixo teor de cimento produzidos com argila expandida (AE) em substitui??o ao agregado gra?do e com adi??o de PPR, TRR e LSR em substitui??o a parte do agregado mi?do. Para tal foi usado inicialmente um planejamento fatorial 2? para a escolha dos CLE com melhor desempenho em termos de consist?ncia, propriedades mec?nicas e massa espec?fica real. Posteriormente foram realizadas redu??es de 10, 20 e 30% de cimento nos CLE que apresentaram melhores desempenhos e caracterizados atrav?s de ensaios mec?nicos. O melhor tra?o resultante da combina??o de propriedades mec?nicas com o consumo de cimento foi caracterizado mediante ensaios de: permeabilidade; resist?ncia ? flex?o; TG/DTA; FRX; MEV; capacidade t?rmica; condutividade t?rmica e difusividade t?rmica. Por fim. Os resultados mostraram que teores de res?duos em torno de 21% apresentaram melhor combina??o de propriedades. Mantendo os teores de res?duos em n?veis ?timos foi poss?vel produzir um CLE com boas propriedades reol?gicas, mec?nicas e t?rmicas com um consumo m?nimo de cimento.
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Assunção, José Wilson. "Concreto Leve Autoadensável: avaliação da influência da argila expandida no processo de dosagem e nas propriedades do concreto." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/102/102131/tde-01072016-115653/.

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Esta tese aborda as influências do agregado leve na dosagem, características físicas e mecânicas de concreto autoadensável (CAA) quando na fração de graúdo da mistura, substitui-se parte do volume absoluto da brita de basalto (máx 19 mm) pelo volume equivalente de argila expandida brasileira (máx 12,7 mm). O fato de conhecer as implicações na reologia do CAA, provocadas pelo uso conjunto de agregados com características físicas distintas e, apresentar este tipo de concreto como uma alternativa promissora para uso na indústria da pré-fabricação em concreto, justificam esta pesquisa. A substituição da brita de basalto pela argila expandida (AE-1506), em teores de volume absoluto, foi de 20%, 40%, 60%, 80% e 100%. Como resultados, produziram-se concretos autoadensáveis com consumo de aglomerantes (cimento Portland CP V-ARI e sílica ativa) da ordem de 510 kg/m³, que atenderam aos limites de autoadensabilidade propostos pela norma NBR 15823-1 (2010). Na condição endurecida, apresentaram massa específica seca de 2.358,3 a 1.720,7 kg/m³, resistência à compressão (fc28) de 60 a 43 MPa, módulo de elasticidade (Esc) de 23 a 34 GPa e eficiência estrutural (FEE) de 22 a 29 MPa.dm³.kg-1, sem sinais visíveis de frente de carbonatação. Obteve-se concreto leve autoadensável (CLAA) a partir de misturas com fração de graúdo foi composta por 60% de argila expandida e 40% de brita de basalto, que atingiram massa específica seca de 1.986 kg/m³, resistência a compressão (fc28) de 51,3 MPa e condutividade térmica () de 1,07 a 1,53 W/m.K. Constatou-se que a argila expandida interfere significativamente nas características dos concretos exigindo, na comparação com CAA confeccionado com 100% de brita de basalto, maior teor de argamassa e relação volume de água/volume de finos mais elevado.
This thesis discusses aspects related to the influence of lightweight aggregate in the mix design, physical and mechanical properties of the self-compacting concrete (SCC) when replacing part of the absolute volume of basalt crushed stone (máx19 mm) with a lightweight aggregate equivalent absolute volume Brazilian expanded clay (máx 12,7 mm). Understanding interference on the rheology of the SCC caused by the use of aggregates with different physical properties and recommend this type of concrete as a promising alternative for the pre-fabricated concrete industry, justify this research. The replacement of basalt crushed stone for lightweight aggregate (AE-1506), in equivalent absolute volume, was 20%, 40%, 60%, 80% and 100%. As a result, self-compacting concrete was produced with consumption of binders (cement Portland CP V-ARI and silica fume) of about 510 kg / m³, appropriate for self- compactibility limits established by the ABNT NBR 15823-1 (2010) standard. In the hardened condition, the dry density value ranged from 2.358,3 to 1.720,7 kg/m³, compressive strength (fc28) ranged from 60 to 43 MPa, elasticity modulus (Esc) ranged from 23 to 34 GPa, and efficiency structural (FES) ranged from 22 to 29 MPa.dm³.kg-1, with no visible signs of carbonation. The self-compacting lightweight expanded clay concrete (SCLC) was obtained from mixtures which its absolute volume fraction of aggregate coarse was composed by 60% of expanded clay and 40% of basalt crushed stone, with dry density of 1986 kg/m³, compressive strength (fc28) of 51.3 MPa and thermal conductivity () varied from 1,07 to 1,53 W/m.K. It was found that the expanded clay significantly interferes in the properties of concretes demanding in comparison with SCC made with 100% basalt crushed stone, mortar content and ratio higher volume of water/volume of higher fines.
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Aly, Atif M. A. H. "Effect of confinement on structural behaviour of axially loaded lightweight concrete columns." Thesis, University of Sheffield, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.334784.

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Books on the topic "Structural Lightweight Concrete"

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Bennett, D. F. H. Structural concrete updates: High-strength concrete, lightweight concrete and shearheads. Slough: Published on behalf of the industry sponsors of the Reinforced Concrete Campaign by the British Cement Association, 1990.

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Domagała, Lucyna. Konstrukcyjne lekkie betony kruszywowe: Structural lightweight aggregate concrete. Kraków: Wydawnictwo PK, 2014.

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Skinner, Eugene H. Structural uses and placement techniques for lightweight concrete in underground mining. Washington, DC: Dept. of the Interior, 1989.

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Skinner, Eugene H. Structural uses and placement techniques for lightweight concrete in underground mining. Washington, D.C: U.S. Dept. of the Interior, Bureau of Mines, 1989.

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1941-, Clarke John L., ed. Structural lightweight aggregate concrete. London: Blackie Academic & Professional, 1993.

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Structural Lightweight Aggregate Concrete. Routledge, 2002. http://dx.doi.org/10.4324/9780203487662.

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Institute, American Concrete. High-Performance structural lightweight concrete. ACI International, 2004.

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A, Holm Thomas, Vaysburd Alexander M, and American Concrete Institute, eds. Structural lightweight aggregate concrete performance. Detroit: American Concrete Institute, 1992.

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P, Ries John, Holm Thomas A, ACI Committee 213., and American Concrete Institute Convention, eds. High-performance structural lightweight concrete. Farmington Hills, Mich: American Concrete Institute, 2004.

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Structural lightweight aggregate concrete performance. 1992.

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Book chapters on the topic "Structural Lightweight Concrete"

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Hoffman, Edward S., David P. Gustafson, and Albert J. Gouwens. "Structural Lightweight Aggregate Concrete." In Structural Design Guide to the ACI Building Code, 419–22. Boston, MA: Springer US, 1998. http://dx.doi.org/10.1007/978-1-4757-6619-6_15.

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Trad, Ayman, Hassan Ghanem, and Raafat Ismail. "Bond Behaviour of Structural Lightweight Concrete." In High Tech Concrete: Where Technology and Engineering Meet, 595–603. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-59471-2_71.

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Ma, X., Y. Zhuge, D. Li, and N. Gorjian. "Structural Properties of Lightweight Rubberized Concrete." In Lecture Notes in Civil Engineering, 53–60. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-7603-0_6.

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Holschemacher, K., A. Ali, and S. Iqbal. "Bond of reinforcement in lightweight concrete." In Insights and Innovations in Structural Engineering, Mechanics and Computation, 1284–85. Taylor & Francis Group, 6000 Broken Sound Parkway NW, Suite 300, Boca Raton, FL 33487-2742: CRC Press, 2016. http://dx.doi.org/10.1201/9781315641645-210.

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Al-Naimi, Hasanain K., and Ali A. Abbas. "Structural Behaviour of Steel-Fibre-Reinforced Lightweight Concrete." In RILEM Bookseries, 730–44. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-58482-5_65.

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Hammer, Tor Arne, Klaas van Breugel, Steinar Helland, Ivar Holand, Magne Maage, Jan P. G. Mijnsbergen, and Edda Lilja Sveinsdóttir. "Economic Design and Construction with Structural Lightweight Aggregate Concrete." In Materials for Buildings and Structures, 18–22. Weinheim, FRG: Wiley-VCH Verlag GmbH & Co. KGaA, 2005. http://dx.doi.org/10.1002/3527606211.ch3.

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Calderón, Verónica, Raquel Arroyo, Matthieu Horgnies, Ángel Rodríguez, and Pablo Luis Campos. "Lightweight Structural Recycled Mortars Fabricated with Polyurethane and Surfactants." In International Congress on Polymers in Concrete (ICPIC 2018), 479–83. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-78175-4_61.

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Berner, D. E., and B. C. Gerwick. "Static and Cyclic Behavior of Structural Lightweight Concrete at Cryogenic Temperatures." In Ocean Space Utilization ’85, 439–45. Tokyo: Springer Japan, 1985. http://dx.doi.org/10.1007/978-4-431-68284-4_47.

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Thienel, Karl-Christian. "Verification of Conversion Factors Used for Compressive Strength Values Obtained for Structural Lightweight Concrete." In High Tech Concrete: Where Technology and Engineering Meet, 1636–44. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-59471-2_188.

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Choi, Jin Young, Han Seung Lee, and Byung Kwon Lee. "An Experimental Study on the Development of Structural Lightweight Concrete Using Micro Foam Agents." In Advances in Fracture and Damage Mechanics VI, 469–72. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-448-0.469.

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Conference papers on the topic "Structural Lightweight Concrete"

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Payam, Shafigh. "Structural Lightweight Aggregate Concrete and Its Applications." In IABSE Conference, Kuala Lumpur 2018: Engineering the Developing World. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2018. http://dx.doi.org/10.2749/kualalumpur.2018.1091.

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<p>Construction industry demands for high amount of raw material to produce concrete. The continuous depletion of natural resources results in negative impact to the environment and shortage of raw material. To reduce environmental impacts of concrete production one way is to utilize by-product and waste materials as cement and/or aggregate replacement in the concrete mixture. However, the next solution is the use of new structural systems and lightweight structural materials to reduce overall weight of a structure. Structural lightweight aggregate concrete (SLWAC) is a promising material to be used in high-rise buildings and long-span bridges to reduce the size of piers, footings, walls and other load bearing elements in such structures. Therefore, application of SLWAC not only reduces the cost of construction but it will have significant contribution in sustainable construction.</p>
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Pordesari, A. J., P. Shafigh, and Z. Ibrahim. "Coconut shell as lightweight aggregate for manufacturing structural lightweight aggregate concrete." In PROCEEDINGS OF GREEN DESIGN AND MANUFACTURE 2020. AIP Publishing, 2021. http://dx.doi.org/10.1063/5.0044606.

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SZILAGYI, HENRIETTE. "BRICKS RECYCLED AGGREGATES FOR STRUCTURAL GREEN LIGHTWEIGHT CONCRETE." In 13th SGEM GeoConference NANO, BIO AND GREEN � TECHNOLOGIES FOR A SUSTAINABLE FUTURE. Stef92 Technology, 2013. http://dx.doi.org/10.5593/sgem2013/bf6/s26.004.

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Al-Naimi, Hasanain, and Ali Abbas. "DUCTILITY OF STEEL-FIBRE-REINFORCED RECYCLED LIGHTWEIGHT CONCRETE." In 7th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering Methods in Structural Dynamics and Earthquake Engineering. Athens: Institute of Structural Analysis and Antiseismic Research School of Civil Engineering National Technical University of Athens (NTUA) Greece, 2019. http://dx.doi.org/10.7712/120119.7203.19035.

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Holschemacher, Klaus. "Flexural Behavior of PVA-Fiber Reinforced Lightweight Concrete." In Research, Development and Practice in Structural Engineering and Construction. Singapore: Research Publishing Services, 2012. http://dx.doi.org/10.3850/978-981-08-7920-4_m-6-0103.

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Vimonsatit, Vanissorn, S. Ade Wahyuni, and Hamid Nikraz. "Shear Behavior of Lightweight Sandwich Reinforced Concrete Slabs." In Modern Methods and Advances in Structural Engineering and Construction. Singapore: Research Publishing Services, 2011. http://dx.doi.org/10.3850/978-981-08-7920-4_s2-s77-cd.

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Hossain, K. M. A., I. N. Celasun, K. M. Y. Julkarnine, and M. A. Hossain. "Properties of Lightweight Self-consolidating Fibre Reinforced Concrete." In The 5th International Conference on Civil, Structural and Transportation Engineering. Avestia Publishing, 2020. http://dx.doi.org/10.11159/iccste20.245.

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Lösch, Claudia, Arno Richter, and Mike Schlaich. "Multifunctional Inhomogeneous Lightweight Concrete Elements – Outline and Structural Behaviour." In IABSE Symposium, Nantes 2018: Tomorrow’s Megastructures. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2018. http://dx.doi.org/10.2749/nantes.2018.s3-45.

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Mahmud, Hilmi Bin, Payam Shafigh, and Mohd Zamin Jumaat. "Development Of Green High Strength Lightweight Concrete In Malaysia." In The Seventh International Structural Engineering and Construction Conference. Singapore: Research Publishing Services, 2013. http://dx.doi.org/10.3850/978-981-07-5354-2_m-41-385.

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Vimonsatit, Vanissorn, Ade Wahyuni, and Hamid Nikraz. "Behavior and Strength of Lightweight Sandwich Reinforced Concrete Beams." In Modern Methods and Advances in Structural Engineering and Construction. Singapore: Research Publishing Services, 2011. http://dx.doi.org/10.3850/978-981-08-7920-4_s2-s76-cd.

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Reports on the topic "Structural Lightweight Concrete"

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Deb, Robin, Paramita Mondal, and Ardavan Ardeshirilajimi. Bridge Decks: Mitigation of Cracking and Increased Durability—Materials Solution (Phase III). Illinois Center for Transportation, December 2020. http://dx.doi.org/10.36501/0197-9191/20-023.

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Type K cement offers a lower slump than conventional concrete, even at a higher water-to-cement ratio. Therefore, a suitable chemical admixture should be added to the Type K concrete mix design at a feasible dosage to achieve and retain target slump. In this project, a compatibility study was performed for Type K concrete with commercially available water-reducing and air-entraining admixtures. Slump and air content losses were measured over a period of 60 minutes after mixing and a particular mid-range water-reducing admixture was found to retain slump effectively. Furthermore, no significant difference in admixture interaction between conventional and Type K concrete was observed. Another concern regarding the use of Type K concrete is that its higher water-to-cement ratio can potentially lead to higher permeability and durability issues. This study also explored the effectiveness of presoaked lightweight aggregates in providing extra water for Type K hydration without increasing the water-to-cement ratio. Permeability of concrete was measured to validate that the use of presoaked lightweight aggregates can lower water adsorption in Type K concrete, enhancing its durability. Extensive data analysis was performed to link the small-scale material test results with a structural test performed at Saint Louis University. A consistent relation was established in most cases, validating the effectiveness of both testing methods in understanding the performance of proposed shrinkage-mitigation strategies. Stress analysis was performed to rank the mitigation strategies. Type K incorporation is reported to be the most effective method for shrinkage-related crack mitigation among the mixes tested in this study. The second-best choice is the use of Type K in combination with either presoaked lightweight aggregates or shrinkage-reducing admixtures. All mitigation strategies tested in this work were proved to be significantly better than using no mitigation strategy.
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Phan, Long T., and H. S. Lew. Punching shear resistance of lightweight concrete offshore structures for the Arctic:. Gaithersburg, MD: National Bureau of Standards, 1988. http://dx.doi.org/10.6028/nist.ir.88-4007.

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McLean, David I., H. S. Lew, Long T. Phan, and Mary Sansalone. Punching shear resistance of lightweight concrete offshore structures for the Arctic :. Gaithersburg, MD: National Bureau of Standards, 1986. http://dx.doi.org/10.6028/nbs.ir.86-3388.

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McLean, David I., H. S. Lew, Long T. Phan, and Hae In Kim. Punching shear resistance of lightweight concrete offshore structures for the Arctic :. Gaithersburg, MD: National Bureau of Standards, 1986. http://dx.doi.org/10.6028/nbs.ir.86-3454.

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Phan, Long T., H. S. Lew, and David I. McLean. Punching shear resistance of lightweight concrete offshore structures for the Arctic :. Gaithersburg, MD: National Bureau of Standards, 1986. http://dx.doi.org/10.6028/nbs.ir.86-3440.

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Rahman, Mohammad, Ahmed Ibrahim, and Riyadh Hindi. Bridge Decks: Mitigation of Cracking and Increased Durability—Phase III. Illinois Center for Transportation, December 2020. http://dx.doi.org/10.36501/0197-9191/20-022.

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Early-age cracking in concrete decks significantly reduces the service life of bridges. This report discusses the application of various concrete mixtures that include potential early mitigation ingredients. Large-scale (7 ft × 10 ft) experimental bridge prototypes with similar restraint conditions found in actual bridges were poured with different concrete mixtures to investigate mitigation techniques. Portland cement (control), expansive Type K cement, internally cured lightweight aggregate (LWA), shrinkage-reducing admixture (SRA), and gypsum mineral were investigated as mitigating ingredients. Seven concrete mixtures were prepared by using individual ingredients as well as a combination of different ingredients. The idea behind combining different mitigating techniques was to accumulate the combined benefit from individual mitigating materials. The combined Type K cement and LWA mixture showed higher concrete expansion compared with mixtures containing Portland cement, Type K cement, LWA, and SRA in the large-scale experimental deck. Extra water provided by LWA significantly enhanced the performance of Type K cement’s initial expansion as well as caused larger total shrinkage over the drying period. A combination of Type K cement and gypsum mineral showed insignificantly higher expansion compared with the individual Type K mixture. Overall, the experimental deck containing SRA showed the least total shrinkage compared with other mixtures. Finite-element modeling was performed to evaluate and predict concrete stress-strain behavior due to shrinkage in typical bridges. A parametric study using finite-element analysis was conducted by altering the structure of the experimental deck. More restraint from internal reinforcement, less girder spacing, larger girder flange width, and more restrictive support conditions increased the concrete tensile stress and led to potential cracking in the concrete deck.
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