aggregate cement
Aggregates for Concrete
2017年8月5日 Hydraulic cement concrete is a cement and water paste in which aggregate particles are embedded. Aggregate is granular material such as sand, gravel, crushed stone, blast-furnace slag, and lightweight aggregates that usually occupies approxi-mately 60 to
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Aggregate-cement chemical interactions - ScienceDirect
1998年7月1日 The aggregate-cement paste interfacial transition zone (ITZ) is known to be the weakest region in concrete, influencing both mechanical properties and durability
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Aggregates - Cement
Gap-graded aggregate are used to obtain uniform textures in exposed aggregate concrete. Close control of mix proportions is necessary to avoid segregation. Shape and Size
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DEM analysis on the role of aggregates on concrete strength
2020年3月1日 Aggregates Interfacial transition zone CT scan Physical tests 1. Introduction The volume of concrete used worldwide is twice that of steel, wood, plastics, and
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Applied Sciences Free Full-Text Siderurgical
1. Introduction. Cement-treated bases (CTB) consists of native soils, gravels, or manufactured aggregates blended with prescribed quantities of cement and water [ 1 ]. CTB are also known as cement-treated
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Cement Concrete and Aggregates - ResearchGate
The concrete microbars are 40 by 40 by 160 mm. The aggregate is graded to pass a 12.5 mm sieve and be retained on a 4.75 mm sieve. The water to cement ratio is 0.33. The
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Aggregate Concrete - an overview ScienceDirect Topics
The importance of the cement content and transport distance and type is best seen with the example of natural aggregate concrete with crushed aggregates in this case study. This
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Construction Aggregates 101: What They Are (and Why They
2023年8月7日 Aggregates are raw materials that are produced from natural sources and extracted from pits and quarries, including gravel, crushed stone, and sand. When used
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Concrete SpringerLink
2021年3月3日 More in detail, concrete is a mixture of cement, water, fine aggregate (sand), and coarse aggregate (gravel or crushed rocks) in which cement and water have
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Concrete SpringerLink
2021年3月3日 Concrete can be defined as “a mixture of aggregate, cement, and water, which hardens” (ISO 6707 standard), “a composite material that consists essentially of a binding medium within which are embedded particles or fragments of aggregate” (ASTM C125 standard), and as a “material formed by mixing cement, coarse and fine aggregate
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Numerical insights into the effect of ITZ and aggregate
2022年8月1日 1. Introduction. As a cement-based composite material, concrete has been widely used in civil engineering, due to its relatively simple fabrication process, low cost and excellent properties (e.g., high compressive strength and durability, as well as thermal and acoustic insulation properties).These properties are strongly linked to the characteristics
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AGGREGATE Definition Usage Examples Dictionary
Aggregate definition: formed by the conjunction or collection of particulars into a whole mass or sum; total; combined. See examples of AGGREGATE used in a sentence.
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Mechanical Properties of Concrete Produced by Light Cement
2022年11月30日 A higher cement percentage is needed to compensate for the artificial aggregate’s increased porosity and softness and decreased hardness . The maximum compressive strength was attained at a 40% volume replacement ratio for the mixture comprising quartz artificial aggregate in this experiment.
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2022年10月3日 Aggregate-cement paste interface: Part I. Influence of aggregate geochemistry Cement and Concrete Research , 29 ( 7 ) ( 1999 ) , pp. 1019 - 1025 , 10.1016/S0008-8846(99)00086-1 View PDF View article View in Scopus Google Scholar
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Enhancing the mechanical behaviour of concretes through
2022年5月1日 In the case of the dolomite concrete, silica fume was added on the aggregate side, and also on the cement side.Fracture toughness tests were carried out according to Mode I (tension at bending ...
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Investigation of the Interfacial Transition Zone between
2017年8月27日 water-cement ratio of the cement paste surrounding aggregate is higher, and the large flat calcium hydroxide crystals form within this region, perpendicular to the surface of aggregate grains, which results in the formation of a highly porous structure in the cement paste[4-6], so the ITZ is known to be the weakest region in concrete.
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Aggregate–cement paste transition zone properties affecting
2005年4月1日 The influence of the cement paste–aggregate interfacial transition zone (ITZ) on the frost durability of high-performance silica fume concrete (HPSFC) has been studied. Investigation was carried out on eight non-air-entrained concretes having water-to-binder (W/B) ratios of 0.3, 0.35 and 0.42 and different additions of condensed silica fume.
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2021年10月5日 In this study, results from long-term monitoring of the tyre/road noises of the exposed aggregate cement concrete (EACC) with the highest grain size of 8 mm and stone mastic asphalt (SMA) surface with the highest grain size of 11 mm performed by close-proximity (CPX) method are presented. There are certain concerns that the EACC
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Properties of seashell aggregate concrete: A review
2018年12月20日 Compressive strength was the main mechanical behaviour studied in researches on seashell aggregate concrete. The incorporation of coarse seashell aggregates generally reduces the compressive strength of concrete (Table 7). The influence of seashell replacement is more pronounced in concrete mixes having high
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Effect of Fine Aggregate Properties on Cement Mortar
2021年1月1日 The change in the properties of fine aggregate has significant potential in altering the efficacy of alkali-activated slag. Therefore, this study investigated the influence of sillimanite sand on the mechanical and microstructural properties of alkali-activated slag (AAS) mortar at ambient temperature, and after exposure to elevated temperatures (250,
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Interfacial interaction of aggregate-cement paste in concrete
2015年1月31日 The chemical and physical interactions in the interfacial transition zone (ITZ) between three different types of coarse aggregates (limestone, granite and basalt) and cement paste were investigated. The results show that all the aggregates are chemically active. Significant amounts of Ca2+, K+, and Na+ are absorbed by all the aggregates
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Utilization of Municipal Solid Waste Incineration Bottom Ash
2021年8月6日 Incineration bottom ash is generated by the incineration of solid waste. Household solid waste is increasing every year and so is incineration bottom ash. This is a problem to treat the incineration bottom ash because the ash has many toxic components. Cement composites can solve this problem and there are many studies for using the
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Vertical distribution of pore-aggregate-cement paste in
2020年3月20日 For each cubic meter, the mixture contained 1539 kg of aggregate, 113 kg of water, 402 kg of cement and 14 kg of admixture, respectively. Correspondingly, the constant water-to-cement ratio and the aggregate-to-cement ratio by mass were 0.27 and 3.70, respectively. Only hard and clean coarse limestone aggregates passing through 9.5
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Lightweight foamed concrete as a promising avenue for
2021年1月1日 In general, the maximum percentage of cement replacement is up to 75% whereas aggregate in foamed concrete can be replaced completely with waste materials. The limitation on the replacement level for cement is low as a high replacement level would hinder the hydration process as a higher amount of cement is replaced.
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Recycled aggregates and recycled aggregate concrete
The extensive, but fragmented research on recycled concrete aggregates and recycled aggregate concrete, which has been carried out in various parts of the world from 1945 to 1985, has been collated to form a comprehensive state-of-the-art document.A thorough analysis of the data has been made, leading to a guide to the production and evaluation
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Study of the recycled aggregates nature’s influence on the aggregate ...
2014年10月15日 Un-hydrated cement grains, natural aggregate: ⩾50 GPa. For the natural aggregate–paste interaction, according to Mehta’s concept [9] and other authors [7], [10], the ITZ is the one inside the cement paste and close to the aggregate which will be weaker than the rest of the paste. This weakness is due to the higher porosity.
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2022年9月10日 Wasted concrete was often used as a recycled aggregate instead natural stone in fresh concrete to reduce the environmental impact in a decade. However, because of the residual mortar interface, the performance of recycled aggregate was weaker. In this paper, the recycled aggregate was prewetted, and the effects of prewetted degree on the
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Application of Pre-Wetted High Titanium Heavy Slag Aggregate in Cement ...
2021年12月7日 High titanium heavy slag is one kind of solid waste that exists in large amounts in the southwest of China. In this paper, this high titanium heavy slag is used as natural pre-wetted material in concrete because of its porous structure. Three kinds of aggregates are used in this concrete. The first one is natural limestone and river sand.
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Aggregate-cement paste interface. ii: influence of aggregate
1998年10月1日 This paper describes part of a large project on aggregate-cement interactions and interface bonding mechanisms in concrete. This part of the study investigates the influence of aggregate physical properties on the nature of aggregate-cement paste interfacial bonding with the aim of establishing the bonding mechanisms as
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