This study compares the properties of normal and recycled brick aggregates to produce a medium range (25–30 MPa) compressive strength of structural grade concrete. Up to date, brick aggregates are commonly used in structural concrete in some South Asian and African countries. Many concrete structures which were built in …
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Published results (Shi et al., 2012a) on compressive strength development of alkali-activated cement concrete containing recycled aggregate indicate that, similar to the case of normal concrete, the strength of alkali-activated cement concrete reduces with increased recycled aggregate percentage in concrete as shown in Table …
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The main goal of this study was to compare two use cycles of natural aggregate concrete and recycled aggregate concrete, which is another way to compare the environmental impacts of recycled materials. A series of concrete mixtures with various replacement ratios of primary resources with recycled ones were prepared for …
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This includes its use in the construction industry, and more particularly in concrete, which uses large quantities of aggregate. A novel aggregate (RPA) comprising recycled plastic was developed. The aggregate produced was lightweight, with a density ranging from 510 to 750 k kg / m 3 and absorption of from 2.7 to 9.81%. Other properties were ...
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The global aggregate production of 40 billion tons (Fig. 1) is an indication of the vast development projects which are materializing around the world [1].As the land for landfill becomes scarce and the world demand of aggregate reaches to an enormous 40 billion tons annually, ways to use C&D waste is gaining importance due to legislation, it …
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Carbonation of concrete is a process which absorbs carbon dioxide (CO2). Recycled aggregate concrete (RAC) may own greater potential in CO2 uptake due to the faster carbonation rate than natural aggregate concrete (NAC). A quantitative model was employed to predict the CO2 uptake of RAC in this study. The carbonation of RAC and …
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20.6. Dimensional stability of recycled aggregates concrete. Concrete durability then is its ability to overcome several types of damage by keeping its appearance, strength, and integrity for its service life of exposure to its environment (Bamigboye et al., 2017, Guo et al., 2018).The dimensional stability of RAC will be treated under the …
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From these three types of recycled coarse aggregate, C1, C2 and C3, and two types of recycled fine aggregate, F1 and F2, four types of suggested RAC applications are recommended for civil and building works, as tabulated in Table 2.Among the three types of civil engineering applications of RAC, namely, CI, CII and CIII with respect to …
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There is a growing need to find ways to reuse fine concrete waste from the construction industry. In this study, recycled concrete fines were granulated and used as lightweight aggregates. Ladle slag, a steel industry residue, was used as a co-binder in different ratios (0, 10, 20, and 30%). The materials were blended and granulated, and …
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A comparative analysis of the experimental results of the properties of fresh and hardened concrete with different replacement ratios of natural with recycled coarse aggregate is presented in the paper. Recycled aggregate was made by crushing the waste concrete of laboratory test cubes and precast concrete columns. Three types of …
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Recycled aggregates (RA) can provide a sustainable solution for replacing natural aggregates (NA) in the concrete mix. However, the stakeholders and inspection professionals lack confidence in predicting their compressive strength (CS) due to limited databases. Most of them solely focus on the concrete mix with natural aggregates only. …
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This article provides a comprehensive review on recycled aggregate (RA) and recycled aggregate concrete (RAC) regarding their history, properties, …
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In the recycled aggregate concrete, the adherence of mortar in the concrete affects the hardness of the aggregates as well as results in increased water absorption. These properties result in a detrimental impact on the concrete's performance especially in its hardened states (e.g. compressive strength).
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A novel aggregate (RPA) comprising recycled plastic was developed. The aggregate produced was lightweight, with a density ranging from 510 to 750k kg/m³ and absorption of from 2.7 to 9.81%.
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A review of the use of recycled aggregates from construction and demolition waste and slag in concrete, with a focus on the codes and norms that regulate their …
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Replacing natural aggregate (NA) with recycled aggregate (RA) has contributed to the trend of sustainable development in civil construction. With this background, improvements in the mechanical properties of recycled aggregate concrete (RAC) and the scientific design of the mixture ratio are attracting more concern in recent …
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2.2.3. Regression tree (RT) Decision tree and regression tree are mathematical models consisting of nodes and branches [40].Generally, two branches are connected with one node, and the node deals with the data according to the feature in the node and the boundary value in the branch [41].The training process of the regression …
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Fig. 10 shows concrete containing natural coarse aggregate and recycled brick coarse aggregate (Liu et al., 2021). Hence, the RCA's physical, chemical, and mechanical characteristics must be investigated before use (Mills-Beale and You, 2010). As previously discussed, it is important to note that these properties would differ from the …
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For decades, recycled coarse aggregate (RCA) has been used to make recycled aggregate concrete (RAC). Numerous studies have compared the mechanical properties and durability of recycled aggregate concrete (RAC) to those of natural aggregate concrete (NAC). However, test results on the shear strength of reinforced …
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Currently, a number of disadvantages hampers the use of recycled concrete aggregates (RCA). The current review proves that concretes made with complete replacement of natural aggregate with …
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Recycled aggregates (RAGs) usage in concrete is surging, inspired by environmental and economic concerns. Regarding predicting various models designed the values of modulus of elasticity (MOE) of concrete with natural aggregates and, in conclusion, they would probably be unreliable when used to concrete with RAG. In the …
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Construction and demolition waste (CDW) management is essential for the sustainable development of a country. Recycled concrete aggregates (RCA) manufactured from CDW can replace a significant portion of natural aggregates in concrete as per various research studies conducted. Nowadays, various alternate …
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Its main purpose was to demonstrate the technical sustainability of multiple recycling of coarse stone aggregates originally obtained from the demolition of existing concrete elements...
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Using recycled aggregates from construction and demolition waste can preserve natural aggregate resources, reduce demand of landfill, and contribute to sustainable built environment. This study provides a comprehensive review on recycled aggregate (RA) and recycled aggregate concrete (RAC) regarding their history, …
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Using recycled concrete aggregates (RCA) for pavements is crucial to achieving sustainability. Implementing RCA for new pavement can minimize carbon …
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Li et al. [48] used RA crushed from waste concrete with a strength grade of 50 MPa.It was found that after carbonation, the water absorption rate decreased, which is consistent with the results observed by Li [41], and the smaller the particle size, the more obvious the effect of reduced water absorption.The reason is that when the particle size …
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When 5% lime is added to the concrete comprising 50% RCA and 60% GGBFS (RGL-111), the fracture surface shows the cleaving of aggregates from the concrete surface (Fig. 2, c) which indicate that with addition of 5% lime, mortar strength and ITZ of the concrete incorporating 50% RCA with 60% GGBFS improved …
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The promotion of recycled aggregate concrete (RAC) can effectively reduce carbon emissions from the construction industry and increase the recycling rate of waste concrete. Owing to the significantly higher creep of RAC than that of natural aggregate concrete (NAC), the accurate prediction of long-term RAC creep …
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Recycled concrete aggregate (RCA) is generally produced by two-stage crushing of demolished concrete, and screening and removal of contaminants such as reinforcement, paper, wood, plastics and …
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Fiber reinforced recycled aggregate concrete (FRAC) is one such material that has gained popularity since the beginning of twenty-first century due to its high strength, eco-friendly, and cost-effectiveness benefits. Fiber reinforcement in recycled aggregate concrete (RAC) tends to reinforce and retard the crack propagation and thus …
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