A novel recycled aggregate concrete was prepared by replacing the natural aggregate with recycled lightweight aggregate. Subsequently, the mechanical properties and compressive stress-strain constitutive relation of the recycled lightweight aggregate concrete (RLWAC) were explored. For this purpose, the recycled lightweight aggregate (RLWA) replacement ratio (0%, 25%, 50%
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1. Production of high grade recycled aggregates The aim of a technologically advanced treatment is the production of recycled aggregates (RA) with homogeneous characteristics, that can be re-utilized in the same original application; for example, the aggregates produced through the comminution of concrete monoliths could be employed in the
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The physical and mechanical properties of these aggregates, and their strength and performance of recycled aggregate concrete are determined. The results show that treatment with H 2 SO 4, and heating and scrubbing yield, aggregate with reduced water absorption and other desired properties of natural aggregate. The concrete made out of these
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Aggregate sludge is a waste product produced from crushing, screening, and washing processes at aggregate plants. Because of the large quantity and high treatment cost of this sludge, it cannot be disposed of as landfill, and thus, has caused environmental concern over the years in Taiwan. In this preliminary study, the recycled aggregate sludge was reutilized for construction applications
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After 28 days, tests are carried out on the specimens. The results show that the mechanical treatment followed by the SF combination significantly enhances the performance of recycled aggregate concretes (RACs). Satisfactory test results are generally obtained for treated recycled aggregate concrete (tRAC) produced with up to 60% tRA and 10% SF.
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Shrinkage property is a significant indicator of the durability of concrete, and the shrinkage of green recycled concrete is particularly problematic. In this paper, construction waste was crushed and screened to generate simple-crushed recycled coarse aggregate (SCRCA). The SCRCA was then subjected to particle shaping to create primary particle-shaped recycled coarse aggregate (PPRCA). On
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Modification treatment of recycled aggregate using PVA emulsion. For the group with the incorporation of fly ash, the replacement percentages of cement by fly ash included 10%, 20%, and 30%, which were labeled as RCF10, RCF20, and RCF30, respectively.
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A novel recycled aggregate concrete was prepared by replacing the natural aggregate with recycled lightweight aggregate. Subsequently, the mechanical properties and compressive stress-strain constitutive relation of the recycled lightweight aggregate concrete (RLWAC) were explored. For this purpose, the recycled lightweight aggregate (RLWA) replacement ratio (0%, 25%, 50%
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Therefore, the heating treatment and the removal of attached mortar of recycled concrete aggregate caused a decrease in mechanical properties in the case of low water/binder ratio but caused an increase in mechanical properties in the case of high water/binder ratio.
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aggregates in the impact resistance, through a better understanding the behavior of recycled plastic in concrete structures, experimenting fresh and hardened concrete mixtures containing recycled plastic. 1.2 Problem Statement: Gaza Strip is a small closed coastal area (365 Km2) and a densely populated
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Treatment of rubber aggregates with water does not improve the transport properties of the concrete, as the penetration depths are comparable to those of concrete containing untreated aggregates. NaOH treatment does improve resistance to water ingress, as the water penetration depths of R8-N2h, R8-N24h and R8-N72h were 12.2, 19.5, and 26.8%
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Mobile Crushing Plant For Recycled Aggregate. Mobile crushing plant is a new type of material crushing equipment with high performance and automation, which integrates crushing, screening and debris sorting in one...
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Establishing an effective method to enhance the adhesion of mortar on recycled concrete aggregate (RCA) is key to the utilization of RCA. In this paper, a novel and simple approach for strengthening the mortar layer of RCA by treatment with a crystallizing agent (CA) was proposed, and the effects of different treatment regime on the density, water absorption, mineral composition, and
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The resource treatment process is the core of the entire construction waste treatment plant. Through the resource treatment,the separation of various sundries in construction waste can be realized, and the recycled aggregates of different specifications are produced according to the raw material requirements of the subsequent building materials.
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Basic Mechanical Properties of Concrete with Machine-Made Sand and Recycled Coarse Aggregate p.1102 Anti-Permeability and Resistance Carbonization Test Study High Performance Concrete with High Content of Fly Ash
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This paper presents an experimental research on mechanical properties of recycled aggregate concrete (RAC) at low and high water/binder (W/B) ratios. Concrete at two W/B ratios (0.255 and 0.586) was broken into recycled concrete aggregates (RCA). A type of thermal treatment was employed to remove mortar attached to RCA. The RAC at a certain (low or high) W/B ratio was prepared with RCA made
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Following the treatment process, the aggregates were utilized in concrete combinations at w/c ratios 0.50 and 0.25, aiming to study their effect on the mechanical properties and durability of concrete with natural crushed and recycled aggregates, at strategic increments in the mix design.
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A novel recycled aggregate concrete was prepared by replacing the natural aggregate with recycled lightweight aggregate. Subsequently, the mechanical properties and compressive stress-strain constitutive relation of the recycled lightweight aggregate concrete (RLWAC) were explored. For this purpose, the recycled lightweight aggregate (RLWA) replacement ratio (0%, 25%, 50%
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Recycled aggregates (RA) from construction and demolition waste are an alternative to natural aggregates in the construction sector. They are usually classified according to their composition. The main constituent materials are separated into the following categories: unbound natural aggregates, ceramic particles, cementitious particles, bituminous materials, and other materials considered
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For this purpose, incorporation of recycled concrete aggregate in concrete products particularly self-compacting concrete (SCC) for structural and non-structural application would be significant achievement. In this study the fresh and hardened properties of SCC prepared by substituting natural aggregates (NA) with recycled coarse aggregates (RCA).
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Shrinkage property is a significant indicator of the durability of concrete, and the shrinkage of green recycled concrete is particularly problematic. In this paper, construction waste was crushed and screened to generate simple-crushed recycled coarse aggregate (SCRCA). The SCRCA was then subjected to particle shaping to create primary particle-shaped recycled coarse aggregate (PPRCA). On
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In this study, modification methods of recycled coarse aggregate (RCA), namely spraying colloidal nano silica (NS) and silica fume (SF) on the surface of RCA, were adopted to enhance the performance of recycled aggregate concrete (RAC). In the RCA modification methods, colloidal NS with different particle sizes (12 nm, 54 nm and 106 nm) and colloidal SF with a particle size of 420 nm were
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Modification treatment of recycled aggregate using PVA emulsion. For the group with the incorporation of fly ash, the replacement percentages of cement by fly ash included 10%, 20%, and 30%, which were labeled as RCF10, RCF20, and RCF30, respectively.
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By treating the recycled aggregate with all treatment processes the physical, mechanical, and durability properties are improved when compared to untreated recycled coarse aggregate concrete.
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Shrinkage property is a significant indicator of the durability of concrete, and the shrinkage of green recycled concrete is particularly problematic. In this paper, construction waste was crushed and screened to generate simple-crushed recycled coarse aggregate (SCRCA). The SCRCA was then subjected to particle shaping to create primary particle-shaped recycled coarse aggregate (PPRCA). On
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Shrinkage property is a significant indicator of the durability of concrete, and the shrinkage of green recycled concrete is particularly problematic. In this paper, construction waste was crushed and screened to generate simple-crushed recycled coarse aggregate (SCRCA). The SCRCA was then subjected to particle shaping to create primary particle-shaped recycled coarse aggregate (PPRCA). On
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By treating the recycled aggregate with all treatment processes the physical, mechanical, and durability properties are improved when compared to untreated recycled coarse aggregate concrete.
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Treatment of rubber aggregates with water does not improve the transport properties of the concrete, as the penetration depths are comparable to those of concrete containing untreated aggregates. NaOH treatment does improve resistance to water ingress, as the water penetration depths of R8-N2h, R8-N24h and R8-N72h were 12.2, 19.5, and 26.8%
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Modification treatment of recycled aggregate using PVA emulsion. For the group with the incorporation of fly ash, the replacement percentages of cement by fly ash included 10%, 20%, and 30%, which were labeled as RCF10, RCF20, and RCF30, respectively.
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the recycled aggregate concrete is almost 85% and 80% of natural aggregate concrete. Amn on.et.al (2002), concrete having a 28 -day compressive strength of 28 MPa was crushed at ages 1, 3 and 28 days to serve as a source of aggregate for new concrete,
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