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 …
At the 50% replacement level, the mechanical properties of recycled aggregate concrete (RAC) demonstrated a 20.0% increase in splitting tensile strength, accompanied by marginal decrease in workability (15.0%) and …
Concrete production, integral to construction and demolition processes, generates substantial waste. solutions and addressing resource management and environmental …
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 …
aggregate concrete, coconut shell aggregate concrete with slag Table 1. Properties of Aggregates Properties Coarse aggregate Coconut shell aggregate Maximum size (mm) 12.5 12.5 Specific gravity 2. ...
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 …
Mechanical and durability performance of mortars with fine recycled concrete aggregates and reactive magnesium oxide as partial cement replacement
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 …
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 …
This study provides a comprehensive review on recycled aggregate (RA) and recycled aggregate concrete (RAC) regarding their history, recycling, reuse and manufacture …
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 …
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 …
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, …
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 ...
Concrete, a man-made composite material, is primarily constituted by cement acting as the principal binder material and coarse aggregate serving as the matrix, along with the incorporation of fine aggregate and water [].Due to the characteristics of low cost and high durability that it possesses, concrete has ascended to be the most widely employed …
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 …
"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 ...
Class L backfill concrete, blinding concrete, and concrete filled in steel tubes. RILEM ( 1994 ): T ype 1 aggregates from masonry rubble, T ype 2 aggregates from concrete rubble; T ype 3 mixture ...
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].
In this paper, a comprehensive literature review was conducted on the utilization of recycled concrete aggregate (RCA), which is the dominant construction and demolition waste material, in base and subbase layers and its …
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 …
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 …
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 …
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 …
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 …
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 …
This paper investigated the diagonal crack propagation and serviceability performance of fifteen deep beams fabricated using lightweight aggregate concrete (LWAC). Experimental variables included the shear span-depth ratio, beam section depth, and bearing plate width. The test results were reported in terms of crack propagation, diagonal crack width, diagonal cracking load, and …
Publication: Journal Proceedings. Volume: 74. Issue: 5. Appears on pages(s): 212-219. ... It is concluded that recycling concrete for use as aggregate in new concrete is feasible and may become routine. ALSO AVAILABLE IN: Electronic Materials Journal. Electronic Structural Journal
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 …
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.
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 …
The evaluation of concrete can be determined by destructive and non-destructive methods. In recent years construction industry started off using demolition waste in structural concrete and coarse aggregate cost has been reduced. Only by pre-treatment for recycled coarse aggregate, the concrete properties will increase. Thus, the recycled coarse aggregates were …
This research aimed to mainly study the mechanical properties of improved recycled aggregate concrete, through added glass fibers with high tensile strength and high temperature resistance, and then subjected to high temperature. The recycled coarse aggregate with maximum sizes at 19, 12.7, and 9.5 mm was composed of crushed concrete, tile, and …
Concrete, Journal of Engineering, 27(12 ... (BW) as potential partial cement or aggregate replacement materials is summarized in this review where the performance is discussed in the form of the ...