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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 concrete mixtures were …
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The British/European product Standard for aggregates for concrete production (BS EN 12620) does not distinguish between primary, secondary (manufactured) or recycled aggregates. However, BS 8500 (complementary UK Standard to …
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Construction and demolition activities consume large amounts of natural resources, generating 4.5 bi tons of solid waste/year, called construction and demolition waste (C&DW) and other wastes, such as ceramic, polyethylene terephthalate (PET), glass, and slag. Furthermore, around 32 bi tons of natural aggregate (NA) are extracted annually. In this scenario, replacing …
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The use of Recycled Concrete Aggregate (RCA) is gaining importance throughout the globe due to the depleting sources of natural aggregate and disposal problem of demolished waste. The advancement ...
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It covers aggregates having an oven dried particle density greater than 2,00 Mg/m3 (2 000 kg/m3) for all concrete, including concrete in conformity with EN 206-1 and concrete used in roads and other pavements and for use in precast …
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The results of attribute importance analysis and correlation analysis showed that the creep behavior of recycled aggregate concrete is significantly affected by loading age, the 28-day compressive strength ratio, and water absorption. Loading age has the strongest correlation with RAC creep while notional size is the least one.
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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 the specific surface …
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Sustainable concrete using recycled coarse aggregates from construction and demolition waste is gaining popularity in the construction industry, but has poor mechanical characteristics due to old ...
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Our analysis encompasses a comprehensive review of RAC's mechanical properties and durability, alongside advanced treatments and innovative mix designs, including the integration of nanotechnology.
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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, recycling, reuse and manufacture …
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By incorporating recycled aggregate into concrete mixes, there is a reduction in the demand for natural aggregates, thereby helping to conserve natural resources and …
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Considering on the current difficulties of predicting the compressive strength of recycled aggregate concrete, this paper proposes a prediction model based on deep learning theory. First, the deep features of water-cement ratio, recycled coarse aggregate replacement ratio, recycled fine aggregate replacement ratio, fly ash replacement ratio as ...
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Recently, effective uses of recycled concrete aggregate (RCA) in cement and concrete industry have attracted a lot of attention from both the environmental and resource preservations (Hu et al., 2013).Because the natural aggregate cannot be reproduced in short term, and aggregate typically accounts for 60 to 75 percent of concrete by volume (Taylor et …
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In this scenario, replacing NA with recycled aggregate (RA) from C&DW and other wastes can mitigate environmental problems. We review the use of RA for concrete production and draw the main challenges and outlook.
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The machine learning model for predicting compressive strength in addition to compressive stress modulus and graphs for recycled aggregate concrete are reviewed, as well as their limitations are discussed. It discusses the research perspectives of recycled aggregate, namely the development of "green" processing methods for recycled ...
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(a) Recycled concrete aggregates before the Los Angeles abrasion test and (b) Recycled concrete aggregates after the Los Angeles abrasion test. Park prepared mixtures in two different gradations according to the coarse aggregate content to investigate the abrasion properties of RCA ( 37 ).
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Using recycled aggregate s from construction and demolition waste can preserve natural aggregate resources, reduce demand of landfill, and contribute to sustainable built …
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It is widely reported that recycled aggregate concrete (RAC) with recycled aggregates demonstrates 17–30% reduction in the compressive strength (Kou et al., 2012; Poon et al., 2007), 15–45% loss in the modulus of elasticity (Limbachiya et al., 2012; Poon et al., 2006), 7–26% reduction in the splitting tensile strength (Elhakam et al ...
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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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Furthermore, recycled aggregate may have already gone through recycling process more than once, making it even weaker [34] than the first generation recycled aggregate [6].Thereby, the resulting recycled aggregate concrete produced from recycled concrete aggregate has lower properties (low-grade) than the concrete produced with the natural …
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Furthermore, Alves et al. [26] found the fresh density of ceramic aggregate concrete containing 20– recycled brick aggregate and sanitary ware aggregate to be varied in the range of 2303.1–2167.4 kg/m 3 and 2248.3–2154.6 kg/m 3, respectively, while that of control concrete was found as 2352.7 kg/m 3. They attributed this linear ...
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This descending strength with increasing the amount of recycled concrete aggregates (RCA) is reported in the literature [20]. The decrease in strength was more noticeable when the quantity of recycled aggregate exceeded 50%. The strength reduction was approximately 15% for 75% replacement of coarse aggregate. For RBA, strength is increased …
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Recently the use of recycled aggregates in structural concrete has been included in the European standard. EN 206:2013+A1. "Concrete – Specification, performance, production and conformity" (CEN, 2016) only concerns the use of coarse recycled aggregates; their use is restricted to less severe environments.Table 1 shows limits for the replacement of natural …
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According to 2017 statistics on the mineral fraction of construction and demolition waste (CDW) generated throughout the European Union (EU), about 300 million tonnes were produced (Eurostat, 2017).Their total conversion to recycled aggregates (RAs) would correspond to around 11% of the total construction aggregate demand (about 2.7 billion tonnes in 2015) …
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For the creation of sustainable and high-performance concrete, it is also necessary to incorporate mineral admixtures of micron, sub-micron, and nano size to address the …
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This monograph addresses the use of recycled concrete aggregates (RCA) as a replacement for natural aggregates (NA) in concrete applications. It aims to provide information and perspectives on ...
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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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Recycled Concrete Aggregate (RCA) adalah agregat kasar yang didapatkan dari limbah beton yang tidak terpakai kemudian dihancurkan kembali dan digunakan sebagai agregat kasar pada campuran beton ...
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Research into the properties of recycled aggregates (RAs) has been the focus for over 40 years [4], but due to undesirable results, such as high-water absorption and poor workability of concrete the industry was discouraged from counting on RA as an alternative.The investigations were largely limited to the manufacturing of non-structural grade recycled …
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Recycled aggregate concrete is produced by fully or partially substituting ordinary aggregates with recycled aggregates derived from construction waste. Therefore, utilizing waste concretes could ...
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