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Showing 1 to 20 of 61 for “"pozzolanic"”.
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Characterisation and properties of alkali activated pozzolanic materials.
… form, which is suitable as a cementitious and pozzolanic admixture. Most European countries are well endowed with coal-fired power stations and this produces fly and bottom ash, flue gas desulphurisation (FGD) gypsum. However, less than 25% of the total ash from power stations has found an …
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Characterization of pozzolanic cement for radioactive waste disposal
… analyze the chemical and physical properties of pozzolanic cement. The principle objective of this research was to determine whether pozzolanic cement is a suitable material for permanently encasing high-level radioactive waste (HLW) and spent-nuclear fuel (SNF) in disposal canisters. This …
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Biomass and Coal Fly Ash in Concrete: Strength, Durability, Microstructure, Quantitative Kinetics of Pozzolanic Reaction and Alkali Silica Reaction Investigations.
… to that of traditional (neat) coal fly ash. Pozzolanic reactions occur simultaneously but not necessarily proportionally to strength development. Mixtures of biomass and coal fly ash in all proportions mitigate alkali-silica-reaction-based (ASR-based) expansion in concrete. Biomass-specific …
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A laboratory study of solidification/stabilization technology for contaminated dredged material
… A with various cement based, pozzolanic, and proprietary additives were analyzed. Also investigated was the immobilization capability of a proprietary polymer for selected organic contaminants when used in conjunction with solidification/stabilization processes. Physical …
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Performance and mechanism on a high durable silica alumina based cementitious material composed of coal refuse and coal combustion byproducts
… to seek for an optimal solution for enhancing pozzolanic reactivity of the relatively inert solid waste-coal refuse in order to improve the utilization efficiency and economy benefit for construction and building materials. The results show that thermal activation temperature ranging from 20°C …
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Characterization of Quarry By-Products as a Partial Replacement of Cement in Cementitious Composites
… These quarry by-products were found to be non-pozzolanic and non-hydraulic. However, there are indications that there may be reactions with the various clays and feldspars in the quarry by-products with calcium hydroxide, which suggests a degree of reactivity that is not necessarily pozzolanic …
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Analysis and reproduction of geopolymer concrete
… that are produced from synthesizing pozzolanic compounds or aluminosilicate source materials with highly alkaline solutions. Geopolymer concrete is a stronger, more durable and more environmentally friendly alternative to ordinary Portland cement (OPC) concrete. Based on Joseph …
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Avaliação das incertezas nas informações sobre as resistências à tração na flexão e compressão de argamassas cimentícias com lodo de ETA
… % higher than the control, possibly due to the pozzolanic activity confirmed by the Pozzolanic Activity Index (PAI) and Modified Chapelle tests. The relative standard uncertainties for flexural and compressive strengths were below 5 %, consistent with laboratory measurement conditions. The …
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Estabilização de areia com adição de cal e cinza volante
… coal - and lime, when wetted, presents a pozzolanic reaction and cements the sand grains. It was intended to confirm research work made abroad, by using a fly ash produced in a thermo-electric plant from the southern part of Brazil. It was taken into account the possibilities that this …
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Stabilization of non-plastic soils with calcium hydroxide-calcium carbonate mixtures
… that the presence of carbonate enhances pozzolanic activity in lime-stabilized non-plastic soils by increasing the solubility of siliceous minerals at high pH levels.
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Um Estudo Físico-Químico-Matemático da Estabilização Alcalina de Solos Argilosos
… equation seems to model satisfactorly the pozzolanic activity. It is argued that water content of compacted soils is not enough to provide for thorough dissolution of lime, therefore cationic exchange does not seem to be an adequate mechanism of alkaline stabilization. Arguments support the …
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Properties of Western Cape concrete with metakaolin
… metakaolin in terms of its morphology and pozzolanic activity, ii) to assess the influence of metakaolin on fresh and hardened concrete properties, and to compare these with the properties of concrete with GGCS, iii) to assess the influence of metakaolin on the deformation behaviour of …
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Influencia de las adiciones puzolánicas en los morteros de restauración de fábricas de interés histórico-artístico
… mortars made of lime mixed with hydraulic, pozzolanic and tixotropic additions. And to study its relation to natural hydraulic limes (NHL). Pozzolanic activation was first studied, concerning to burning time an temperature. Moreover, chemical analysis (Fratini), thermal analysis (TG/DTA) an …
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Synergistic and Environmental Benefits of Using Cement Kiln Dust With Slag and Fly Ash in Cemented Paste Tailings
… result of proliferating hydration and augmented pozzolanic reactivity. Previous studies carried out by other researchers on hardened cemented paste tailings specimens containing Portland cement-pozzolans binders confirmed the possibility of the presence of un-reacted or un-hydrated particles of …
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Development of Sustainable Concretes for the Gulf Region
… two cements (CEM I 52.5N and CSAB 72.5) and two pozzolanic additions (FA-type S and GGBS). <br/><br/>The initial experimental work involved characterization of the test materials. Recycled aggregates were characterized physically and chemically to establish conformity with construction standards. …
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Assessment of lime-treated clays under different environmental conditions
… namely cation exchange, flocculation and pozzolanic reaction, which cause the changes in the soil characteristics after adding lime in the presence of water. The dispute is about whether these mechanisms occur in a sequential or synchronous manner. More precisely, the controversy concerns …
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Nano-ChemoMechanical assessment of Rice Husk Ash cement by wavelength dispersive spectroscopy and nanoindentation
… properties of cement. RHA is found to have high pozzolanic properties through its reaction with portlandite to form different types of calcium silicate hydrate (C-S-H). It is found that C-S-H in RHA cement has lower Ca/Si ratios compared to pure ordinary portland cement (OPC) samples prepared …
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Physical, mechanical and durability properties of sugarcane ash enhanced compressed earth blocks stabilized with fly ash and lime powder
… health scarce. These wastes have potential pozzolanic reactivity and may be used to develop cementitious materials that are sustainable, while maintaining requirements as affirmed in various standards. The sector is also an important economic sector that has a large environmental impact in …
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Freeze-Thaw Resistance and Microstructural Characteristics of Concretes Containing Pozzolans
… partially replaced by various quantities of the pozzolanic materials. The results demonstrated that the increase in workability attributed to the air-entraining admixture was greater in MK concrete than in SF concrete and occurred for a greater range of dosages of the admixture. Improvements in …
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