Aggregate effect on the mechanical and fracture behaviours of concrete
The physical properties of concrete components, including mortar, aggregate, and the ITZ, are listed in Table 2.Various kinds of rocks with higher elasticity and strength can be selected as the aggregate [19, 20], and they usually serve as the skeleton in concretespared with aggregate, the mechanical properties of mortar are relatively low [50, 61].
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Background of recycled concrete aggregate used in Japan
In Japan, recycled concrete aggregate (RCA) and recycled-aggregate concrete (RAC) are standardized in the Japanese Industrial Standards (JIS) A 5021–5023. The differences between the specifications in JIS and those in foreign countries are explained. In Japan, the durability of RAC under severe conditions, particularly freezing and thawing with/without …
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Effect of Curing Mechanism on Sulfuric Acid …
To explore the effect of curing mechanism on the mechanical properties and sulfuric acid corrosion resistance of the geopolymer recycled aggregate concrete (GRAC), the specimens were cured at high temperature …
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Effect of aggregate type on Compressive strength of concrete
The utilisation of three types of aggregate for concrete work is investigated in this paper. Normal concrete is being produced from different types of aggregate and this imparts different property to the resulting concrete. The most important property of concrete is its compressive strength. For the purpose of this work, three types of coarse aggregates, quartzite, granite, and river gravel ...
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Recycled Aggregate: A Viable Solution for Sustainable Concrete …
Schematic illustration of C&DW in concrete [] in (a); scanning electron microscopy of mortar containing 40% C&DW [] in (b).Another negative feature of C&DW is its heterogeneity [].Exemplifying this negative aspect, Figure 3 presents the main fractions composing the amount of C&DW obtained in the city of Naples in Italy [].It is observed that the C&DW has 47.37% …
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Axial Compression Behavior of Composite Sandwich Panel …
The coarse aggregate produced from the construction and demolished waste of masonry structure is called mixed recycled coarse aggregate (MRA), which is mainly composed of concrete recycled coarse aggregate (CRA) and brick recycled coarse aggregate (BRA). The paper presents the results of an experimental and numerical study of concrete composite …
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Experimental Investigation on the Properties of Sustainable …
Pervious concrete (PC) as a green infrastructure material has been increasingly used due to its positive environmental impacts, such as controlling storm water runoff, removing water pollutants and reducing heat island effect. The aggregate gradation is a critical factor influencing the physical properties of PC. Therefore, this paper represents an attempt to …
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Preparation technology, mechanical properties and …
For the island-reef engineering construction background in the South China Sea, the research studied the preparation technology, mechanical properties and chloride ion diffusion behavior of coral aggregate seawater concrete and discussed the steel bars corrosion behavior of coral aggregate seawater concrete (CASC) and reliability analysis of service life, which provide …
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Mechanical properties and microstructural characteristics of …
The interfacial transition zone (ITZ) between the internal aggregate of concrete and the cement paste is the weak link of concrete. In order to explore the relationship between the macro- and meso-mechanical properties and the micro-structural characteristics of concrete, the interfacial strength of coral aggregate concrete (CAC) was measured by bond strength method, …
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Use of fine recycled concrete aggregates in concrete: A …
This paper discusses the state-of-the-art of the fine recycled concrete aggregates (fRCA), focusing on their physical and chemical properties, engineering properties and …
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Impact Splitting Tensile Properties of Fly Ash–Recycled Aggregate Concrete
This paper aims to study the impact splitting tensile properties of fly ash–recycled aggregate concrete (FARAC). The splitting tensile tests of FARAC with different replacement rates of recycled aggregate (0%, 30%, 50%, ) and different fly ash contents (0%, 10%, 20%, 30%) were carried out by using split Hopkinson pressure bar (SHPB) under different impact …
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Recycling of Brick Aggregate Concrete as Coarse …
For the same mix design, the recycled aggregate concrete produces almost similar strength compared with the first class brick aggregate concrete commonly used in Bangladesh. However, relatively better …
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PERFORMANCE OF CONCRETE WITH RECYCLED …
The rapid growth in infrastructure development has posed significant environmental challenges, particularly through the depletion of natural resources and the generation of construction and demolition waste (CDW). This study …
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A Combined Damage and Mesomechanics Model for …
In order to assess the influence of SPHFs, this paper analyzes the impact of SPHFs experimentally on the compression performance of the RAC. Additionally, using …
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Enhancement strategies for recycled brick aggregate concrete …
The production of cement has been increased rapidly from 1.10 billion tonnes to 3.27 billion tonnes in the past 20 years, which was estimated to reach 4.83 billion tonnes in 2030 [1].Constructing corresponding amount of concrete leads to an increasing demand of raw construction materials, and subsequently results in a shortage of natural aggregate around the …
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The Effects of Aggregate Properties on Concrete Mix …
2.1 Physical Properties of Coarse Aggregates 2.1.1 Gradation. Particle size distribution of aggregates significantly affect the packing density and void content in concrete. According to Neville [], the gradation of aggregate has the main role in establishing the workability of mixtures.Gradation can influence workability, segregation, bleeding, pumpability and …
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Mechanical properties of alkali-activated slag lightweight aggregate …
Journal of Cleaner Production. Volume 359, 20 July 2022, 132136. ... Thus, using alkali-activated slag as the cementitious material, alkali-activated slag lightweight aggregate concrete (AAS-LWAC) consists partly — or all — of lightweight aggregate (LWA) as the coarse aggregate. AAS-LWAC can take full advantage of AAS and LWA, possessing ...
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Interfacial interaction of aggregate-cement paste in concrete | Journal …
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 from the cement …
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Alkali-aggregate reaction in recycled aggregate concrete
Using recycled concrete aggregate (RCA) to substitute original aggregate (OA) is of significance for sustainable development of construction materials. However, uncertainties remain with respect to the long-term durability of concrete containing RCA. ... Materials Journal, 100 (5) (2003), pp. 371-380. View in Scopus Google Scholar. Shehata et ...
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Journal of Building Engineering
Commonly generated solid waste, such as recycled bricks and concrete materials, can serve as aggregates to substitute natural counterparts [9, 10].The use of recycled concrete aggregate (RCA) in concrete as full and partial replacements of natural coarse aggregate (NCA) is growing interest in the construction industry [11].Research studies have demonstrated that the …
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The Utilization of Recycled Aggregate in High Performance …
Mechanical and durability performance of mortars with fine recycled concrete aggregates and reactive magnesium oxide as partial cement replacement
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Freeze-thaw Durability of Recycled Aggregate Concrete: An Overview
The characteristics of surface appearances, mass loss, relative dynamic modulus of elasticity and strength loss of different recycled aggregate concretes(RAC) exposed to freeze-thaw cycles were analyzed. It was found that the freeze-thaw resistance of RAC could be determined by the recycled aggregate compositions and admixtures. Both the saturation …
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Comprehensive Review Of Recycled Aggregate Concrete In …
Concrete production, integral to construction and demolition processes, generates substantial waste. solutions and addressing resource management and environmental …
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Use of recycled aggregate concrete in structural …
This article presents a comprehensive review on the use of recycled concrete aggregate (RCA) and recycled aggregate concrete (RAC) in construction, with emphasis on structural applications and identification of …
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Digital simulation of the aggregate–cement paste interfacial …
Researchers using backscattered scanning electron microscopy, along with quantitative image analysis techniques, have clearly demonstrated the existence of a highly porous interfacial region between aggregate particles and the cement paste matrix in ordinary Portland cement concrete. This paper presents the results of a digital-image-based simulation …
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The Utilization of Recycled Aggregate in High Performance Concrete…
The slump test is the common and practical workability test for fresh concrete and is performed in accordance with ASTM C143 [17]. Fig. 1 shows the slump values for HPCs that are prepared with natural aggregate (b) and RA (c). The maximum detected slump value of HPC without RA was 185 mm [18].Previous studies, however, had demonstrated that completely …
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Strength of Lightweight Glass Aggregate Concrete | Journal …
The new aggregate is similar to conventional lightweight aggregates, but the ratio of density of concrete to compressive strength is much more favorable to making structural concrete. This paper summarizes the results of experiments on the mechanical properties of concrete made of this new expanded glass aggregate.
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Use of fine recycled concrete aggregates in concrete: A …
Journal of Building Engineering. Volume 38, June 2021, 102196. ... It is also reported that multiple crushed concrete aggregate, will eventually have increase of the volume of old adhered mortar [11]. In Japan, with repeated crushing, more than 50% of …
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Experimental Study of the Geopolymeric Recycled Aggregate Concrete …
"Study of the recycled aggregates nature's influence on the aggregate-cement paste interface and ITZ." Constr. Build. Mater., 68, 677–684. Crossref. Google Scholar. Xiao, J., Li, W., Corr, D., and Shah, S. (2013). "Simulation study on the stress distribution in modeled recycled aggregate concrete under uniaxial compression ...
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Multi objective optimization of recycled aggregate concrete …
Based on the above principles, a database containing 807 sets of RAC compressive strength and electric charge passed was established. The selected input variables include cement content (Cement), water-cement ratio (W/C), sand content (S), curing age (CA), replacement ratio of recycled coarse aggregate (r), fly ash content (FA) and slag content …
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