混凝土和砂浆用替代细骨料的适用性:河砂替代技术综述

IF 1.6 Q3 ENGINEERING, CIVIL Australian Journal of Civil Engineering Pub Date : 2021-10-28 DOI:10.1080/14488353.2021.1971596
Branavan Arulmoly, Chaminda Konthesingha
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引用次数: 9

摘要

由于河砂的短缺,世界各地的建筑行业在获得高质量的混凝土和砂浆细骨料方面面临许多困难。这个问题促使研究人员在建筑中寻找可能的替代品来取代河砂。简要回顾了研究人员提出的替代品、替代品的优点和缺点、标准的可得性,以及在混凝土和砂浆中用替代品替代河砂的影响的先前研究。人造砂(M砂)、近海砂、海砂、采石场粉尘和拆除废物已被确定为最常见的河砂替代品。M砂和采石场粉尘比河砂、近海砂和海砂棱角更大,表面更粗糙,总比表面积更高,有害物质含量更低。这些特性对水泥基混合料的新鲜、硬化和耐久性性能起着至关重要的作用,研究表明,与河砂混凝土和砂浆相比,水泥基混合料的结果既有积极的,也有消极的。角状颗粒和粗颗粒增强了水泥基混合料的强度,但降低了和易性。替代材料的孔隙率和比表面积对混凝土和砂浆的吸水率有举足轻重的影响。
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Pertinence of alternative fine aggregates for concrete and mortar: a brief review on river sand substitutions
ABSTRACT Construction industries around the world are facing many difficulties in obtaining good-quality fine aggregates for concrete and mortar due to a shortage of river sand. This problem leads the researchers to find possible alternatives to replace river sand in construction. A brief review has been carried out to identify the alternatives suggested by researchers, merits and demerits of substitutions, availability of standards, and previous studies on the effects of replacing river sand with alternatives in concrete and mortar. Manufactured sand (M Sand), offshore sand, sea sand, quarry dust, and demolition waste have been identified as the most common substitutions for river sand. M Sand and quarry dust have more angularity, rougher surface, higher total specific surface, and lower presence of deleterious substances than river sand, offshore sand, and sea sand. These characteristics played a vital role in the fresh, hardened, and durability performance of cement-based mixes where studies revealed both positive and negative outcomes when comparing with river sand concrete and mortar. Intensely, the strengths of cement-based mixes were improved with angular and rough particles while the workability was declined. The void content and specific surface of alternatives manifested pivotal effects on water absorption of concrete and mortar.
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来源期刊
CiteScore
3.90
自引率
7.70%
发文量
31
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