Engineering and microstructural properties of self-compacting concrete containing coarse recycled concrete aggregate

IF 1.8 4区工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY

Magazine of Concrete Research Pub Date : 2024-04-14 DOI:10.1680/jmacr.23.00338

Dinesh Kumar, Kanta Rao, P. Lakshmy

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Abstract

In this paper, the possibility of utilizing coarse recycled concrete (CRCA) aggregate obtained from a Construction and Demolition Waste (CDW) Plant in Delhi for making a 60 MPa Self compacted concrete (SCC) was evaluated. The CRCA was used in as-collected condition and was not processed any further. Aggregate Packing (bulk) Density (APD) method was adopted to obtain an aggregate mixture exhibiting maximum bulk density/least void content (45%) with which the SCC-CRCA mixture was prepared. In addition, SCC was also made using aggregate mixtures in which the NCA was replaced with CRCA at 0%, 20%, and 100 % (of the total coarse aggregate content) by weight. The cement, fly ash, silica fume, and water were kept constant for all SCC mixtures. The effect of CRCA on the flow behavior, mechanical strength, shrinkage characteristics, and microstructure properties of SCC mixtures were evaluated. The test results indicated that the SCC mixtures made with CRCA up to 45% replacement can be used for structural concrete which is higher than that recommended in Indian (20 %) and International specifications (35 %) for traditionally vibrated (conventional) concrete.

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含有粗再生混凝土骨料的自密实混凝土的工程和微观结构特性

本文评估了利用从德里一家建筑和拆迁废弃物（CDW）处理厂获得的粗再生混凝土（CRCA）骨料制造 60 兆帕自密实混凝土（SCC）的可能性。CRCA 以收集时的状态使用，未作任何进一步处理。采用骨料堆积密度（APD）法获得骨料混合物，该混合物具有最大堆积密度/最小空隙含量（45%），并以此制备 SCC-CRCA 混合物。此外，还使用骨料混合物制备了 SCC，其中用 CRCA 替代了 NCA，按重量计分别为 0%、20% 和 100%（粗骨料总含量）。所有 SCC 混合物中的水泥、粉煤灰、硅灰和水都保持不变。评估了 CRCA 对 SCC 混合物的流动行为、机械强度、收缩特性和微观结构特性的影响。测试结果表明，使用 CRCA 制成的 SCC 混合物的替代率最高可达 45%，可用于结构混凝土，高于印度（20%）和国际规范（35%）对传统振捣（常规）混凝土的建议替代率。

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来源期刊

Magazine of Concrete Research 工程技术-材料科学：综合

CiteScore

4.60

自引率

11.10%

发文量

102

审稿时长

5 months

期刊介绍： For concrete and other cementitious derivatives to be developed further, we need to understand the use of alternative hydraulically active materials used in combination with plain Portland Cement, sustainability and durability issues. Both fundamental and best practice issues need to be addressed. Magazine of Concrete Research covers every aspect of concrete manufacture and behaviour from performance and evaluation of constituent materials to mix design, testing, durability, structural analysis and composite construction.