Dissimilar surface treated recycled coarse aggregate in concrete

IF 0.5 4区工程技术 Q4 CONSTRUCTION & BUILDING TECHNOLOGY

Cement Wapno Beton Pub Date : 2023-12-06 DOI:10.32047/cwb.2023.28.3.2

J. Vengadesh Marshall Raman, V. Ramasamy

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Abstract

The surface zone of the recycled aggregate plays a significant role in the strength and durability of concrete. In this research, various concrete series incorporating natural coarse aggregate [NCA], untreated recycled coarse aggregate RCA(UN), mechanical scrubbing treated coarse aggregate RCA(MS), sulfuric acid treated coarse aggregate RCA(H2SO4) and hydrochloric acid treated aggregate RCA(HCl) were investigated. Manufactured sand was used as an alternative to natural river sand in five series of concrete with 100% replacement ratio. The mechanical properties: compressive, split tensile, and flexural strength, respectively, were determined at the age of 28 and 56 days. Durability properties: water absorption, drying, sulfuric acid, sodium sulphate and sorptivity test were determined at the age of 28, 56 and 90 days and the results were compared to reference concrete. According to the results, RCA(UN) was found to marginally decreased the concrete performance, and the above mentioned treated aggregate shows a significant improvement in overall performance compared to RCA(UN), especially RCA(MS), which enhances the concrete more significantly than other methods. Moreover, the scanning electron microscope results also emphasize the enhanced microstructure of treated recycled aggregate in concrete. The photographic view of the cross sections of the samples shows a superior interfacial transition zone in all kinds of treated aggregate concrete than in untreated recycled aggregate concrete.

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混凝土中的异种表面处理再生粗骨料

再生骨料的表面区域对混凝土的强度和耐久性起着重要的作用。在本研究中，研究了各种混凝土系列，包括天然粗骨料[NCA]、未经处理的再生粗骨料RCA(UN)、机械擦洗处理的粗骨料RCA(MS)、硫酸处理的粗骨料RCA(H2SO4)和盐酸处理的粗骨料RCA(HCl)。在五个系列的混凝土中，用人工砂代替天然河砂，替代率为100%。力学性能:分别在28和56天时测定抗压、劈裂拉伸和抗弯强度。耐久性:在龄期28、56、90天进行吸水、干燥、硫酸、硫酸钠、吸附性试验，并与参考混凝土进行对比。结果表明，RCA(UN)对混凝土性能有轻微的降低作用，而上述处理后的骨料与RCA(UN)相比，综合性能有显著提高，尤其是RCA(MS)对混凝土的增强作用比其他处理方式更为显著。此外，扫描电镜结果也强调了处理后的再生骨料在混凝土中的微观结构的增强。样品横截面的照片显示，各种处理过的骨料混凝土比未经处理的再生骨料混凝土具有更好的界面过渡区。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Cement Wapno Beton CONSTRUCTION & BUILDING TECHNOLOGY-MATERIALS SCIENCE, COMPOSITES

CiteScore

1.30

自引率

28.60%

发文量

审稿时长

>12 weeks

期刊介绍： The Publisher of the scientific bimonthly of international circulation, entitled "Cement-Wapno-Beton" ["Cement-Lime-Concrete"], is the Fundacja Cement, Wapno, Beton [Foundation Cement, Lime, Concrete]. The periodical is dedicated to the issues concerning mineral setting materials and concrete. It is concerned with the publication of academic and research works from the field of chemistry and technology of building setting materials and concrete