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网页2021年6月17日 Currently, a number of disadvantages hampers the use of recycled concrete aggregates (RCA). The current review proves that concretes made with 网页2020年5月2日 Abstract This study proposes a new mix design method for C30 recycled concrete using recycled aggregate crushed from different strength source concrete (SC). The dosages of cement, water, sand, and coarse recycled concrete aggregate (CRCA) are the same as the corresponding components in natural concrete, but the CRCA should be 网页2021年6月17日 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 RCA allow the production of high-quality concrete. One of the possibilities for improving concrete properties with RCA is the use of extended 网页2014年8月26日 This work is devoted to the study of fresh and hardened properties of concrete containing recycled gravel. Four formulations were studied, the concrete of 网页Due to the complex component of coarse aggregate used in mixed recycled aggregate concrete (MRC), the conventional mix design method is not suitable for MRC. The 网页2021年3月13日 A 5 mm increase of concrete cover is recommended as a simple option that ensures that the probability of depassivation due to chloride ingress on recycled 网页1990年12月1日 Phase I!: Selection of suitable mix design procedure for recycled aggregate concrete. Phase II1: Trial mixes of recycled aggregate concrete and identification of 网页The candidate waste aggregates span a wide range that can be divided into three main categories of construction and demolition waste, recycled concrete aggregate, and 网页2020年10月1日 Zhang et al. (2020) de-veloped models for predicting the properties and mix design of pervious concrete with recycled aggregates by using RSM. The variables were superplasticizer, viscosity 网页2023年3月7日 This research aimed to mainly study the mechanical properties of improved recycled aggregate concrete, through added glass fibers with high tensile strength and 网页2020年10月30日 For instance, design recycled aggregate pervious concrete with 35% target porosity, 15% target paste content and 50% aggregate content, after giving the particular goals, the optimized TVC model shows that optimal grading is 15% size A, 71.3% size B, 8.7% size C and 5% size S, multi-objective optimized model of IPT and ACT 网页2012年11月27日 The specific gravity of the natural aggregate was 2.65 and that for recycled concrete aggregate was 2.19 and 2.04 for 20 and 13 mm maximum size recycled concrete aggregate, respectively. The water absorption for 20 and 13 mm recycled concrete aggregates was 5.3 and 8.2 %, respectively, compared to 1.0 % for the natural aggregate. 网页2013年3月29日 After demolition of old roads and buildings, the removed concrete is often considered worthless and disposed of as demolition waste. By collecting the used concrete and breaking it up, recycled concrete aggregate (RCA) is created (Fig. 1).This stone focuses on coarse RCA which is the coarse aggregate from the original concrete that is created 网页19.2.1 Recycled concrete aggregate (RCA) Coarse RCA complies to the requirements of maximum 5% masonry content, 5% fine materials, 0.5% lightweight material, 5% asphalt, 1% foreign material and 1% acid soluble sulfate, and is suitable for use in concrete as per BS 8500-2 (2006). In designated concrete RC20/25 to RC40/50, RCA can automatically 网页2021年6月17日 fine and coarse aggregates [2]. Cement production and aggregate preparation consume non-renewable fossil energy, and carbon dioxide production is the main cause of global warming [3,4] (Figure 1). Figure 1. Renewable cycle of recycled concrete aggregates (RCAs). The production of concrete requires the consumption of 网页2017年11月15日 15.2.4 Regulations for Inspection of Recycled Aggregates (1) The recycled aggregates shall be graded and tested as explained in Sect. 15.2.3 (2) Plants for recycled aggregates with an annual production output of one million tonnes and above, of the same type, and same specifications of recycled aggregates testing should have a 网页2020年10月1日 The performance of RCA-C depends more on the quality rather than the quantity of RCA [17]. With 100% coarse-RCA, a concrete mix designed for 30 MPa of target strength has been reported to reach a 网页Contribute to chengxinjia/sbm development by creating an account on GitHub. 网页2017年9月1日 The recycled aggregates obtained from waste concrete are more angular and have higher absorption and specific gravity than natural coarse aggregates and it 网页—The use of recycled concrete as a new aggregate. Proc. of Symposium, Energy and Resource Conservation in the Cement and Concrete Industry, Canmet, Ottawa, 1976. Buck A. D. —Recycled concrete. Highway Research Record, No 430, 1973. Waste concrete as aggregate for new concrete, S. Frondistou-Yannas. ACI Journal, August 1977, p. 373–374. 网页2021年6月17日 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 RCA allow the production of high-quality concrete. One of the possibilities for improving concrete properties with RCA is the use of extended 网页2014年8月26日 This work is devoted to the study of fresh and hardened properties of concrete containing recycled gravel. Four formulations were studied, the concrete of reference and three concretes containing recycled gravel with 30, 65 and 100 % replacement ratios. All materials were formulated on the basis of S4 class of flowability 网页2021年11月30日 For full incorporation of coarse recycled concrete aggregates and the design of elements without shear reinforcement, the calibrated partial factor reduces the design value of shear resistance by 10% (design with EN1992) or 15% (design with prEN1992) in comparison to natural aggregate concrete’s design. For the shear design of 网页Contribute to chengxinjia/sbm development by creating an account on GitHub. 网页2020年9月15日 The mechanical properties of several kinds of recycled aggregates concrete were investigated to understand the change rule. Firstly, recycled aggregate concrete was studied with 0.10, 0.20, 0.30, 0.40, 0.50, 0.60, 0.70, 0.80, 0.90, and 1.0 aggregates replacement rate. 网页2018年5月30日 Research outcomes revealed, as expected, that carbon dioxide equivalent emissions decreased slightly as the use of recycled aggregates increased. Emissions for concrete with 0.5 w/c were between 347 and 351 kg of CO2-e/m3. It was also corroborated that cement is the material with the greatest influence on greenhouse gas emission 网页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 2,055 kg / m 3. Further, 28-day strengths of between 14 and 18 MPa were achieved. Flexural strength was also measured. SEM analysis was undertaken to view the structure of the aggregate and 网页2022年3月7日 mentioned title “Recycling of Concrete” This stone [5]consist the introduction of recycled concrete aggregate with its uses and properties. Various test results on Recycled concrete aggregate also described. It also consist the difference between RCA and natural aggregate. The future recommendations are also discussed in addition. 网页The tests of fresh density, compressive strength at 7days, porosity and water permeability for four mixes of pervious concrete with various water-to-cement ratio are investigated. A small single sized natural river aggregate ranged from (9.5 to 12.5mm) with aggregate cement ratio equal to (3.7) were used in the mixtures. 网页2021年3月8日 miand design for recycled aggregaye concrete. Mix Design and Properties of Recycled Aggregate Concretes Know More 26 08 2014 This work is devoted to the study of fresh and hardened properties of concrete containing recycled gravel Four formulations were studied the concrete of reference and three concretes containing recycled gravel 
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