Relevant bibliographies by topics / Pozzolanic Reactions

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  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers
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Academic literature on the topic 'Pozzolanic Reactions'

Author: Grafiati
Published: 4 June 2021
Last updated: 5 February 2022

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Journal articles on the topic "Pozzolanic Reactions"

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Merida, Ahcene, and Fattoum Kharchi. "Corrosion of the Pozzolan Concrete in Sulfates." Advanced Materials Research 911 (March 2014): 494–98. http://dx.doi.org/10.4028/www.scientific.net/amr.911.494.

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Sulfate attack and its effects are important from both scientific and industrial viewpoints. Itis perceived that cements containing pozzolan have better performance in sulfate solutions,since the pozzolanic reactions reduce the quantity of calcium hydroxide and increasecalcium silicate hydrate. This paper investigates the physical and mechanical properties ofconcretes made by blended cement containing Algerian natural pozzolan of volcanic origin, and Portland cement. in order to better determine the pozzolanic effect of the pozzolan addition in the concrete, the analysis of the experimental results of the effect of the partial replacement of the cement by the naturalpozzolana showed that it contributes positively to the improvement of its mechanical characteristics, its durability with respect to the permeability to the chlorine ions, the ultrasonic pulse velocity as well as the sulphate resistance. The present study confirms the pozzolanic reactivity of the natural pozzolans used.
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Čáchová, Monika, Lenka Scheinherrová, Libor Kobera, Martina Urbanová, Jiří Brus, and Martin Keppert. "Monitoring of Kinetics of Pozzolanic Reaction." Key Engineering Materials 722 (December 2016): 126–31. http://dx.doi.org/10.4028/www.scientific.net/kem.722.126.

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The pozzolanic additions are widely used as concrete component for numerous technical, economic and environmental reasons. Obviously the hydration process in a pozzolana containing system differs from hydration of Ordinary Portland Cement (OPC) what is indicated macroscopically by slower increase of strength and lower hydration heat. This paper aims to study pozzolanic reaction from perspective of chemical kinetics. From this point of view pozzolanic reaction and carbonation are two parallel reactions which are competing for portlandite (Ca (OH)2). The rate of each of these two reactions is characterized by rate constant and order of reaction. The system under study was 1:1 mixture lime – ceramic powder. The course of reaction was primarily studied by thermogravimetry which results were further subjected to kinetic analysis. MAS NMR spectroscopy was used for study of structural changes taking place in material in the course of pozzolanic reaction.
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Juimo Tchamdjou, Willy Hermann, Sophie Grigoletto, Frédéric Michel, Luc Courard, Toufik Cherradi, and Moulay Larbi Abidi. "Effects of Various Amounts of Natural Pozzolans from Volcanic Scoria on Performance of Portland Cement Mortars." International Journal of Engineering Research in Africa 32 (September 2017): 36–52. http://dx.doi.org/10.4028/www.scientific.net/jera.32.36.

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The aim of this paper is to assess the possibility of using natural pozzolans (NPs) from Cameroonian volcanic scoria as supplementary cementitious materials (SCMs) in the production of Portland cement mortars. Four natural pozzolans (Black Natural Pozzolan: BNP, Dark-Red Natural Pozzolan: DRNP, Red Natural Pozzolan: RNP and Yellow Natural Pozzolan: YNP) with 3600, 4500, 4700 and 5200 cm2/g Blaine fineness respectively were produced from different colors (Black, Dark red, Red and Yellow) volcanic scoria in a laboratory mill. Natural pozzolans were characterized with regard to particle size distribution, particle shape, electrical conductivity, X-ray fluorescence (XRF) and X-ray diffraction (XRD). The calcium hydroxide consumption by NPs was assessed firstly by electrical conductivity measurements of calcium hydroxide/NPs suspensions with calcium hydroxide excess. Evidence of pozzolanic reactivity of NPs is revealed in hydrated lime pastes, and low reactivity was observed in aqueous suspensions. The effects of 15, 25, and 35 wt.% of NPs as cement substitution on the properties of Portland cement mortars were investigated. Different properties were studied such as setting time, consistency, mechanical strength, pozzolanic activity, absorption by capillarity and resistance to carbonation. The reactivity of NPs was also assessed by means of the mechanical strength development of mortars. The results obtained show that pozzolanic and hydraulic reactions take place in OPC systems. The correlation between mechanical strengths and physical properties of NPs has been established. The study concludes that using DRNP and RNP at 15 wt. % cement replacement can ameliorate globally the performance of mortar. Using all NPs at 35 wt. % has negative effect on the fundamental properties of cementitious mortars.
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Cizer, Özlem, Koen Van Balen, and Dionys Van Gemert. "Competition between Hydration and Carbonation in Hydraulic Lime and Lime-Pozzolana Mortars." Advanced Materials Research 133-134 (October 2010): 241–46. http://dx.doi.org/10.4028/www.scientific.net/amr.133-134.241.

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A combined reaction of hydration and carbonation takes place in hydraulic lime and lime-pozzolana mortars. Hydration reactions are the first reaction and carbonation of lime is the complementary reaction in the strength gain. Competition between these two reactions can occur in lime-pozzolana mortars if the pozzolanic material has low reactivity with lime, leading to the consumption of lime by carbonation reaction. The degree and the order of these reactions are strongly influenced by the moisture content. Hydration reactions are enhanced under moist conditions while carbonation is delayed. Curing under dry conditions does not sufficiently increase their strength because the hydration reactions are slowed down or even terminated by the full carbonation of lime in lime-pozzolana mortars. The consequence of this on the mechanical properties of the mortars is remarkable while the same impact is not observed in their porosity. Such mortars require moist conditions to ensure sufficient strength development.
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Ťažký, Martin, and Rudolf Hela. "Synergistic Effect of High Temperature Fly Ash with Fluidized Bed Combustion Fly Ash in Cement Composites." Key Engineering Materials 722 (December 2016): 113–18. http://dx.doi.org/10.4028/www.scientific.net/kem.722.113.

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Using high temperature fly ash for his pozzolan properties to cement composite production is known a few years ago. New ways combustion of fossil fuels also creates a new type of fly ash, named fluidized bed combustion fly ash. However, this fly ash has same pozzolan properties as has high temperature fly ash, this type is not using for production of cement composites. Fluidized bed combustion fly ash has highly variable chemical composition but usually it has a higher amount of free CaO together with sulphates. This higher amounts of free CaO after mixing of fluidized bed combustion fly ash with water to some extent becomes an activator for the beginning of the pozzolanic reaction, during which is consumed the extinguished CaO. If there is also present high temperature fly ash in cement composite, it could be accelerated his pozzolanic reaction in the same manner using a fluidized bed combustion fly ash. In this experiment was tested a synergy effect in the use of fluidized bed combustion fly ash with high temperature fly ash as an additive. The experiment was carried out on cement pastes that have been studied in particular the progress of hydration processes, pointing to a possible acceleration of pozzolanic reactions of both types of fly ash.
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Suttikul, Supaluk, Kanyarat Ano, and Kedsarin Pimraksa. "Effect of Calcium Hydroxide Content on Pozzolanic Reaction of Calcined Clays: Their Mechanical Properties and Microstructures." Materials Science Forum 1034 (June 15, 2021): 161–68. http://dx.doi.org/10.4028/www.scientific.net/msf.1034.161.

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The research aimed to investigate the effect of calcium hydroxide content on pozzolanic reaction of calcined clays. Pozzolanic reaction of calcined clay was determined in terms of its mechanical properties, phase development and microstructures. Three clay minerals (two kaolinitic clays and kaolinite-montmorillonite clay) were chosen to produce pozzolanic materials via calcination at temperature of 700 °C to allow dehydroxylation of clay minerals. Ratios of calcium hydroxide to calcined clays were varied from 0.1 to 0.5. Mixing water contents or liquid to solid ratios (0.62, 0.75 and 0.80) and curing times (7 and 28 days) were also studied. It was found that calcium aluminosilicate hydrate (stratlingite) could be formed after pozzolanic reactions of all clay minerals. The development of stratlingite agreed with the strength development showing the highest compressive strength at 26 MPa (28 days) when kaolinite-montmorillonite clay was used as pozzolanic material and the ratio of calcium hydroxide to calcined clay was 0.5.
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Wang, Xiao-Yong. "Analysis of Hydration and Optimal Strength Combinations of Cement-Limestone-Metakaolin Ternary Composite." Advances in Materials Science and Engineering 2019 (May 2, 2019): 1–13. http://dx.doi.org/10.1155/2019/8361810.

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Metakaolin (MK) is an aluminosilicate pozzolan material and can contribute to property development of concrete due to the pozzolanic reaction. Limestone (LS) powder presents the dilution effect, nucleation effect, and chemical effect on hydration of cement. When metakaolin and limestone are used together, due to the additional chemical reaction between the aluminum phase in MK and limestone, the synergetic benefit can be achieved. This study presents a hydration model for cement-limestone-metakaolin ternary blends. Individual reactions of cement, metakaolin, and limestone are simulated separately, and the interactions among cement hydration, limestone reaction, and metakaolin reaction are considered through the contents of calcium hydroxide and capillary water. The hydration model considers the pozzolanic reaction of metakaolin, chemical and physics effects of limestone, and synergetic effect between metakaolin and limestone. Furthermore, the gel-space ratio of hydrating concrete is calculated using reaction degrees of binders and concrete mixtures. The strength development of ternary blends is evaluated using the gel-space ratio. Based on parameter analysis, the synergetic effect on strength development is shown and the optimal combinations of cement-limestone-metakaolin ternary blends are determined.
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Lee, Nankyoung, Yeonung Jeong, Hyunuk Kang, and Juhyuk Moon. "Heat-Induced Acceleration of Pozzolanic Reaction Under Restrained Conditions and Consequent Structural Modification." Materials 13, no. 13 (2020): 2950. http://dx.doi.org/10.3390/ma13132950.

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This study investigated the heat-induced acceleration of cement hydration and pozzolanic reaction focusing on mechanical performance and structural modification at the meso- and micro-scale. The pozzolanic reaction was implemented by substituting 20 wt.% of cement with silica fume, considered the typical dosage of silica fume in ultra-high performance concrete. By actively consuming a limited amount of water and outer-formed portlandite on the unreacted cement grains, it was confirmed that high-temperature curing greatly enhances the pozzolanic reaction when compared with cement hydration under the same environment. The rate of strength development from the dual reactions of cement hydration and pozzolanic reaction was increased. After the high-temperature curing, further strength development was negligible because of the limited space availability and preconsumption of water under a low water-to-cement environment. Since the pozzolanic reaction does not directly require the anhydrous cement, the reaction can be more easily accelerated under restrained conditions because it does not heavily rely on the diffusion of the limited amount of water. Therefore, it significantly increases the mean chain length of the C–S–H, the size of C–S–H globules with a higher surface fractal dimension. This finding will be helpful in understanding the complicated hydration mechanism of high-strength concrete or ultra-high performance concrete, which has a very low water-to-cement ratio.
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Ouypornprasert, Winai, Narong Traitruengtatsana, and Kong Kamollertvara. "Optimum Partial Replacement of Cement by Nanosilica, Microsilica and Rice Husk Ash for Mass Production of Concrete." Key Engineering Materials 751 (August 2017): 544–49. http://dx.doi.org/10.4028/www.scientific.net/kem.751.544.

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The objective of this technical paper was to propose the use of optimum partial replacement of cement by pozzolan of high-silica content i.e. nanosilica, silica fume and rice husk ash. Firstly cement hydration, pozzolanic reactions of pozzolan and stoichiometry were reviewed. Then the optimum fractional replacement of cement by pozzolan based on the complete consumption of calcium hydroxide and the strength activity index (SAI) were formulated and proposed. After that the results of a series of tests of cement mortars were shown to verify the proposed concepts. The applicability for the mass concrete production was demonstrated by prediction of mean values of nonnormal distributions from the corresponding specifications.
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Gadouri, Hamid, Khelifa Harichane, and Mohamed Ghrici. "Assessment of sulphates effect on pH and pozzolanic reactions of soil–lime–natural pozzolana mixtures." International Journal of Pavement Engineering 20, no. 7 (2017): 761–74. http://dx.doi.org/10.1080/10298436.2017.1337119.

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Dissertations / Theses on the topic "Pozzolanic Reactions"

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Wang, Shuangzhen. "Biomass and Coal Fly Ash in Concrete: Strength, Durability, Microstructure, Quantitative Kinetics of Pozzolanic Reaction and Alkali Silica Reaction Investigations." Diss., CLICK HERE for online access, 2007. http://contentdm.lib.byu.edu/ETD/image/etd1819.pdf.

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Tekin, Ahmet Veli. "Effect Of Coating Materials And Mixture Constituents On The Permeability Of Concrete." Master's thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614214/index.pdf.

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The improvement in the impermeability of concrete was studied using different methods. The main aim was to investigate impermeability improvement of concrete and to compare these methods. Two different methods were examined to investigate and compare impermeability and strength improvement of concrete by using two different sets of concrete specimens. These methods included the application of coating materials to concrete and the production of concrete using different constituent amounts and types. The first set of concrete specimens was prepared by applying two different coating materials (a coating material including both powder and liquid components<br>and a coating material including only a liquid component) on reference concrete specimens separately. The second set of concrete specimens was prepared using different proportions of concrete constituents such as cement, water, steel and plastic fibers, mineral and chemical concrete admixtures. Various tests were conducted on both sets of concrete specimens in order to compare the permeability of concrete specimens. However, some of these tests v were not applied on all of the specimens because of test and material specifications. The tests were used to evaluate compressive strength, water absorption, chloride ion penetration and depth of water penetration under pressure. These test methods were carried out on concrete cube specimens and concrete cores taken from those specimens according to the relevant standards. It was found that the permeability of the concrete specimens decreased significantly when the coating material which was composed of the combination of powder and liquid components was applied on concrete specimens. However, permeability did not decrease significantly for concrete specimens coated with the coating material composed of only a liquid component. Significant improvement in the impermeability of the concrete specimens was observed when the amount of cement was increased, the water-to-cement ratio was decreased, mineral admixtures (silica fume and fly ash) and plasticizers were used. This improvement was associated with densification of the concrete microstructure and reduction in capillary pores as a result of pozzolanic reaction and due to reduction in water-to-cement ratio. Coating materials were determined to be effective for concretes with high permeability prior to coating whereas their effect was less significant for lower-initial permeability concretes. Moreover, the effect of coating materials on permeability differed depending on their chemical compositions. The effect of using steel fibers and plastic fibers for the improvement of concrete impermeability was found to be insignificant.
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Silva, Patricia Barboza da. "Estabilização de misturas de resíduos sólidos de demolição e da indústria cerâmica para uso em camadas de pavimentos viários." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/3/3138/tde-03112014-113759/.

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Esta pesquisa trata da estabilização de misturas de agregados reciclados por meio da ativação de seus finos, cujas composições possibilitam a ocorrência de reações químicas de cimentação. Para o desenvolvimento da pesquisa foram utilizados dois tipos de agregados reciclados: um proveniente de resíduo de demolição de natureza cimentícia e outro da indústria de cerâmica vermelha. O uso dos materiais foi feito por meio de dosagens para obtenção de misturas cujas combinações de materiais pudessem, quimicamente, potencializar a ocorrência de hidratação do cimento anidro existente nos finos do agregado reciclado cimentício e de reação pozolânica pela pozolanicidade da cerâmica vermelha. Com isso foram obtidas cinco misturas, compostas pelos agregados reciclados em estudo misturados entre si e com a adição de aglomerantes hidráulicos, sobre as quais foram realizados ensaios em laboratório para verificação da ocorrência das reações químicas esperadas com consequente estabilização das misturas, de modo a influenciar nos respectivos comportamentos mecânicos. Também foi realizada a avaliação de características do empacotamento dos grãos como forma de verificar se o arranjo físico, neste caso, exerce influência significativa na melhora do comportamento mecânico das misturas estudadas. Os resultados obtidos indicaram que, de fato, ocorreram as reações químicas esperadas, comprovadas pelos resultados dos ensaios de termogravimetria e difração de raios x, realizados em três diferentes idades de cura. Verificou-se, também, a melhora no comportamento mecânico das misturas por meio do aumento da resistência à compressão simples e do módulo de resiliência com a evolução da cura, além de baixa deformabilidade aos 91 dias de cura. Com isso foi comprovada a estabilização das misturas em estudo, com a consequente melhora de seus desempenhos, sendo devida, principalmente, à ocorrência das reações químicas de hidratação do cimento anidro e pozolânica. A pesquisa demonstrou a possibilidade de se estabilizar misturas de agregados reciclados cimentícios e de cerâmica vermelha por meio da ocorrência de reações químicas de cimentação promovidas pela combinação destes materiais.<br>This research deals with the stabilization of mixtures constituted by recycled aggregates through the activation of its fines portions, whose components enable the occurrence of chemical cementation reactions. In order to develop this research, two types of recycled aggregates were used: one from demolition waste with cementitious origin, and the other one from the red ceramic industry. The use of these materials was done through mix designs to obtain mixtures whose combinations of materials could chemically increase the occurrence of hydration of the anhydrous existing in fine portion of the recycled cementitious aggregates, and pozzolanic reactions due to the pozzolanicity of red ceramics. Thus, five mixtures were obtained, and they were composed by the studied recycled aggregates, mixed together and with the addition of hydraulic binders, on which laboratory tests were performed in order to verify the occurrence of the expected chemical reactions with consequent stabilization of the mixtures, in order to influence their mechanical behavior. Furthermore, it was performed the evaluation of packing characteristics of the particles to verify if the physical arrangement, in this case, has any significant influence on improving the mechanical behavior of the mixtures studied. The results obtained indicated that in fact the expected chemical reactions occurred, which was verified by the results from thermogravimetry and X-ray diffraction tests performed at three different times of curing. The improvement of the mixtures mechanical behavior by increasing of their compressive strength and their resilient modulus was also verified as the mixtures were cured, in addition to low deformability at 91 days of curing. Thus, the stabilization of the mixtures studied was confirmed, which was mainly due to the occurrence of chemical hydration reactions of the anhydrous cement and pozzolanic reactions. The study demonstrated the possibility of stabilizing mixtures of recycled aggregates cementitious waste and red ceramic by the occurrence of cementing chemical reactions promoted by combination of these materials.
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Ambruz, Pavel. "Vývoj betonů s vysokým obsahem popílku a ověření jeho trvanlivosti v různých prostředích." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2014. http://www.nusl.cz/ntk/nusl-226741.

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This thesis contains two main parts: theoretical and experimental. The theoretical part deals with summarization knowledge of high-volume fly ash (HVFA) concretes. Among others, there are mentioned processes of producing of fly ash, characteristic features and resistance to aggressive environments of HVFA concretes. The theoretical part ends with a suitable example of practical application. In the practical part were tested properties of nine different mixtures containing 40%, 50% and 60% replacement by weight of the cement by fly ash. They were compared with the reference mixtures without fly ash addition. The main endpoints were long-term compressive strength, resistance to aggressive environments, the influence of fly ash on consistency, hydratation temperatures, water absorption and volume changes.
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Heyns, M. W., and M. Mostafa Hassan. "South Africa Class F Fly Ash for roads : physical and chemical analysis." Interim : Interdisciplinary Journal, Vol 13, Issue 3: Central University of Technology Free State Bloemfontein, 2013. http://hdl.handle.net/11462/310.

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Published Article<br>Fly Ash is a by-product at thermal power stations, also otherwise known as residues of fine particles that rise with flue gases. An industrial by-product may be inferior to the traditional materials used construction applications, but, the lower the cost of these inferior materials make it an attractive alternative if adequate performance can be achieved. The objective of this study is to evaluate the chemical and physical effectiveness of self-cementing fly ashes derived from thermal power stations for construction applications with combined standards. Using laboratory testing specimens, suitable types of Fly Ashes namely: Kendal Dump Ash, Durapozz and Pozzfill, were tested to the required standards to evaluate the potential properties. All three Fly Ashes have been classified as a Class F Fly Ash, which requires a cementing agent for reactions to take place and for early strength gains in the early stages of the reaction processes. The Fly Ashes conformed to the combination of standards and have shown that the proper reactions will take place and will continue over period of time. The use of fly ash is accepted worldwide due to saving in cement, consuming industrial waste and making durable materials, especially due to improvement in the quality fly ash products.
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Ali, Hatim, and Mostafa H. A. Mohamed. "Assessment of lime treatment of expansive clays with different mineralogy at low and high temperatures." Elseveir, 2019. http://hdl.handle.net/10454/17536.

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Yes<br>This paper examines the impacts of clay mineralogy on the effectiveness of lime stabilisation at different temperatures. A comprehensive experimental programme was conducted to track down the evolution of lime-clay reactions and their durations through monitoring the evolution of strength gain at predetermined times using the Unconfined Compressive Strength (UCS) test. The study examined clays with different mineralogy compositions comprising Na+ Bentonite and Ball (Kaolinite) clay. Four different clays were tested including 100% bentonite, 100% Ball clay and two clay mixtures with ratios of 1:1 and 1:3 by mass of bentonite to Ball clay. All clays were treated using a range of lime content up to 25% and cured for a period of time up to 672 h at two different temperatures of 20 and 40 °C. The results showed that the continuity of the fast phase (stage 1) of strength gain was dependent on the availability of lime in particular at the higher temperature. Whereas, for the same lime content, the duration of the fast phase and the kinetic of strength gain were significantly related to the clay mineralogy and curing temperature. Except for the initial strength gain at 0 h curing time, the lime-treated Ball clay specimens at 20 °C appeared to show no strength gain throughout the curing period that extended up to 672 h. However, when curing occurred at 40 °C, the no strength gain stage only lasted for 72 h after which a gradual increase in the strength was observed over the remaining curing period of time. The addition of Bentonite to Ball clay succeeded in kicking off the strength gain after a short period of curing time at both curing temperatures.
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Unsal, Saglik Asli. "Alkali-silica Rectivity And Activation Of Ground Perlite-containing Cementitious Mixtures." Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/12611249/index.pdf.

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Perlite is a volcanic mineral. The latest investigations on ground perlite showed that it is suitable for pozzolanic usage. Thus, it is of vital importance especially for countries rich in perlite such as Turkey. The aim of this study is to investigate the advantages and problems associated with using perlite in concrete and to identify accurate methods and amounts of use for producing durable cementitious mixtures. Within the scope of this study, the alkali-silica reactivity of perlite containing cementitious mixtures were compared using four different methods. Expansion mechanism of the mixtures were tried to be understood by measuring the alkalinity of bath waters. In order to cope with early strength decreases caused by perlite addition, activation of the mixtures by chemical and thermal methods were attempted. It was found that chloride containing chemicals are very effective at later ages and sodium containing chemicals are more effective at early ages. Sodiumhydroxide addition to the perlite containing mixtures was found to be detrimental to both the initial and late-age strengths of mortars. It was concluded that perlite addition generally results in a decrease in alkali-silica expansions. However, the expansion of concrete samples should be investigated comprehensively. Thermal curing at high temperatures resulted in a rapid increase at 1-day strengths, however, for better ultimate strengths lower thermal treatments or no-thermal curing were found to be more effective. Compared to the traditional portland cement concretes, high-volume ground perlite concretes have environmental and economical advantages.
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Roubal, David. "Vývoj vysokopevnostních betonů s vysokým obsahem el. popílků." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2019. http://www.nusl.cz/ntk/nusl-392363.

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This diploma thesis deals with the study of high-strength, high-volume fly ash concrete. The theoretical part of this thesis focuses on the detailed characteristic and main principles of high-strength concrete, high-volume fly ash concrete. In addition, according to the findings, the technology of high-strength and high-volume fly ash concrete, including principles of high strength, has been described. On the basis of the findings, high-strength, high-volume fly ash concrete for specific compressive strengths has been designed and created in the experimental section. These concretes were then subjected to a number of tests.
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Idir, Rachida. "Mécanismes d'action des fines et des granulats de verre sur la réaction alcali-silice et la réaction pouzzolanique." Thèse, Université de Sherbrooke, 2009. http://savoirs.usherbrooke.ca/handle/11143/1934.

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Recycling composite glass with different colours in order to be manufactured into new glass products is at present not economically viable. Therefore, the search for new issues other than stockpile areas or dumping sites could be a serious opportunity. To a certain extent, one of the possible solutions is to use the recycled glass in manufacturing cements and in the preparation of concrete mixtures. However, it is essential to manage the two main behaviours that the glass can have when used in cement-based materials: (1) the use of glass as coarse aggregates reveals harmful behaviour related to alkali-silica reaction; (2) on the other hand, it can result in useful behaviour related to pozzolanic reaction if used as fine particles. Furthermore, the significant alkali content should not be overlooked as their mass corresponds to about 13% of the total mass of the glass and as they may activate the alkali-silica reaction. An experimental programme was conducted to provide answers to the various questions raised about the use of glass in cement-based materials. The first part of this work was primarily devoted to the evaluation of the reactive potential of glass in mortars (alkali and pozzolanic reactions). At this stage, nine classes of glass particles ranging from 3[mu]m to 2.5 mm were considered. Then, fine glass particles were used in order to counteract the negative effect of some classes of coarse aggregates having revealed alkali-reactive behaviour. The second part of this work was performed to study the mechanisms that could explain the behaviours of fine and coarse particles in aqueous and concentrated environments. Different answers have been proposed to explain the observed behaviour in terms of grain sizes of glass.
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Bayer, Petr. "Použitelnost ložového popele z vitrifikovaného lignitového uhlí v kompozitních cementech." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2014. http://www.nusl.cz/ntk/nusl-217052.

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Předložená magisterská práce se zabývá možným použitím vitrifikovaného lignitového lóžového popele jako náhrada slinku v kompozitních cementech. Byly zkoumány vlivy přidaného vitrifikovaného lóžového popele, jeho jemnosti, alkalických roztoků a jejich koncentrací. Byly připraveny kompozitní cementy v souladu s normou DIN EN 197 – 1. V těchto cementech bylo nahrazeno 30 % slinku vitrifikovaným lóžovým popelem. Konkrétně byly připraveny kompozitní cementy s vitrifikovaným lóžovým popelem o jemnosti 5549 cm2/g a 8397 cm2/g. Dále byly přidány alkalické roztoky hydroxidů a síranů vždy o dvou různých koncentracích, za účelem stimulace pucolánové a/nebo geopolymerní reakce. Mechanické vlastnosti připravených vzorků byly charakterizovány mechanickým testováním na prizmách s rozměry 40×40×160 mm, jak je specifikováno v normě DIN EN 196 – 1. Byla provedena nedestruktivní měření dynamického elastického modulu a destruktivní testovaní na pevnosti v tlaku a v ohybu. Distribuce velikosti částic a chemická analýza vstupních materiálů byla vykonána pomocí laserové granulometrie a rentgenové fluorescence. U zatvrdlých kompozitů bylo dále zkoumáno po 2 a 28 dnech hydratace fázové složení s využitím metody rentgenové difrakce a mikrostruktura s využitím skenovací elektronové mikroskopie. Výsledky ukázaly, že mechanické vlastnosti jsou nezávislé na množství přidaných alkálií stejně jako na jemnosti přidaného vitrifikovaného lóžového popele. Nicméně, znatelně nižší mechanické pevnosti byly pozorovány pro vzorky, které byly aktivovány hydroxidy, pravděpodobně kvůli brzké tvorbě silikátového hydrogelu. Vzorky aktivované sírany nedosáhly pevností jako referenční malta.
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Book chapters on the topic "Pozzolanic Reactions"

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Dodson, Vance H. "Pozzolans and the Pozzolanic Reaction." In Concrete Admixtures. Springer US, 1990. http://dx.doi.org/10.1007/978-1-4757-4843-7_7.

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Rademaker, P. D., and R. B. Wiegers. "The Processing of Industrial Waste for Immobilization and/or Recycling Applying Pozzolanic Reactions." In Environmental Technology. Springer Netherlands, 1987. http://dx.doi.org/10.1007/978-94-009-3663-8_52.

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Artioli, G., M. Secco, A. Addis, and M. Bellotto. "5. Role of hydrotalcite-type layered double hydroxides in delayed pozzolanic reactions and their bearing on mortar dating." In Cementitious Materials, edited by Herbert Pöllmann. De Gruyter, 2017. http://dx.doi.org/10.1515/9783110473728-006.

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Salvador, S. "Prototyping Flash Calciners for the Manufacture of Synthetic Pozzolana from Kaolinite Clay." In Flash Reaction Processes. Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-011-0309-1_12.

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Birgisson, Bjorn, and Mahir Dham. "Optimization of Clay Addition for the Enhancement of Pozzolanic Reaction in Nano-modified Cement Paste." In Nanotechnology in Civil Infrastructure. Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-16657-0_8.

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Criaud, A., and G. Cadoret. "HPCs and Alkali Silica Reactions. The Double Role of Pozzolanic Materials." In High Performance Concrete. CRC Press, 2018. http://dx.doi.org/10.1201/9780203752005-19.

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"pozzolanic reaction." In Dictionary Geotechnical Engineering/Wörterbuch GeoTechnik. Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-41714-6_163318.

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Conference papers on the topic "Pozzolanic Reactions"

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Ukrainczyk, Neven, Jure Zlopaša, Eduardus Koenders, Camila Aparecida Abelha Rocha, and Romildo Dias Toledo Filho. "Pozzolanic Reactions in Cementitious Materials for Subsurface Applications." In ASME 2014 33rd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/omae2014-24665.

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Silica fume (SF) is used as a constituent to formulate cementitious materials for subsurface (oil-well) applications, e.g. by the offshore industry. Using green supplementary pozzolanic materials like silica fume could both improve the material’s performance and the footprint of the sustainable solution. X-ray diffraction and isothermal calorimetry were employed to investigate the evolution of cement paste hydration (water to binder ratio 0.44) after 14 h, 3, 7, and 28 days of curing. Experimental results are presented for both cement pastes made of Class G Portland cement and for a blended paste system where 8% of the Class G cement has been replaced by silica fume. The results indicate beneficial effects of SF on the microstructural development of the slurry.
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Krishnan, Padmaja, Min-Hong Zhang, and Richard Liew. "Pozzolanic reactions in ultra-high performance concrete containing silica fume and fly ash." In Fifth International Conference on Sustainable Construction Materials and Technologies. Coventry University and The University of Wisconsin Milwaukee Centre for By-products Utilization, 2019. http://dx.doi.org/10.18552/2019/idscmt5106.

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Bui, Trinh, Yuko Ogawa, Kenichiro Nakarai, and Kenji Kawai. "Effect of Injection of NaOH Solution on Pozzolanic and Hydration Reactions in Low-Calcium Fly Ash Cement Paste." In Fourth International Conference on Sustainable Construction Materials and Technologies. Coventry University, 2016. http://dx.doi.org/10.18552/2016/scmt4s196.

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Koenders, Eduardus, Camila Aparecida Abelha Rocha, Romildo Dias Toledo Filho, and Neven Ukrainczyk. "Modeling Pozzolanic Systems for Subsurface Cementitious Systems." In ASME 2013 32nd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/omae2013-10916.

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The secondary pozzolanic reaction mechanism has been modeled explicitly in the Delft hydration model Hymostruc. The model calculates the progress of the hydration process as a function of the particle size distribution, the water cement ratio, the temperature and the cement and pozzolanic chemistry. The consumption of portlandite due to the activation of the pozzolanic materials is shown in detail. The numerical results are validated by an experimental testing plan on G-cement and 8% of silica fume and a water to cementitious ratio of 0.44. The simulated development of portlandite and degree of hydration and the experimental results are in good agreement.
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FERREIRA MENDES, BEATRIZ, Carlos Kenichi Suzuki, Marco César Prado Soares, MURILO FERREIRA MARQUES DOS SANTOS, EGONT ALEXANDRE SCHENKEL, and ERIC FUJIWARA. "Study of activation energy and reaction parameters on the pozzolanic reaction using quartz and silica nanoparticles." In XXV Congresso de Iniciação Cientifica da Unicamp. Galoa, 2017. http://dx.doi.org/10.19146/pibic-2017-78252.

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Silitonga, Ernesto, Rachmat Mulyana, Hamidun Batubara, Enny Sinaga, and Jintar Tampubolon. "Effect of Initial Characteristic on Promoting the Pozzolanic Reaction in Soil Solidification Work." In International Conference of Science, Technology, Engineering, Environmental and Ramification Researches. SCITEPRESS - Science and Technology Publications, 2018. http://dx.doi.org/10.5220/0010082402580262.

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Santra, Ashok Kumar, B. R. Reddy, Feng Liang, and Rocky Fitzgerald. "Reaction of CO2 With Portland Cement at Downhole Conditions and the Role of Pozzolanic Supplements." In SPE International Symposium on Oilfield Chemistry. Society of Petroleum Engineers, 2009. http://dx.doi.org/10.2118/121103-ms.

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Igarashi, S. "Effects of pozzolanic reaction on the evolution of coarse capillary pore structure and phase constitution in cement pastes with mineral admixtures." In ConcreteLife'06 - International RILEM-JCI Seminar on Concrete Durability and Service Life Planning: Curing, Crack Control, Performance in Harsh Environments. RILEM Publications SARL, 2006. http://dx.doi.org/10.1617/291214390x.010.

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Reports on the topic "Pozzolanic Reactions"

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Buck, Alan D. Use of Pozzolan or Slag in Concrete to Control Alkali-Silica Reaction and Sulfate Attack. Defense Technical Information Center, 1988. http://dx.doi.org/10.21236/ada198810.

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