Technological Center, University Federal of Alagoas, Campus A.C. Simões, BR 104 Tabuleiro do Martins, Maceió, AL 57.072-970, Brazil.
Department of Mining and Petroleum Engineering, Escola Politécnica, University of São Paulo, Av. Prof. Almeida Prado No. 83, 05508-900, Brazil.
Waste Manag. 2015 Nov;45:171-9. doi: 10.1016/j.wasman.2015.07.008. Epub 2015 Jul 11.
Due to the environmental impact of construction and demolition waste (CDW), recycling is mandatory. It is also important that recycled concrete aggregates (RCA) are used in concrete to meet market demands. In the literature, the influence of RCAs on concrete has been investigated, but very limited studies have been conducted on how the origin of concrete waste and comminution processes influence RCA characteristics. This paper aims to investigate the influence of three different comminution and sizing processes (simple screening, crushing and grinding) on the composition, shape and porosity characteristics of RCA obtained from concrete block waste. Crushing and grinding implies a reduction of RCA porosity. However, due to the presence of coarse quartz rounded river pebbles in the original concrete block mixtures, the shape characteristics deteriorated. A large amount of powder (<0.15 mm) without detectable anhydrous cement was also generated.
由于建筑和拆除废物（CDW）对环境的影响，废物的回收利用是强制性的。同样重要的是，要将再生混凝土骨料（RCA）用于混凝土中，以满足市场需求。在文献中，已经研究了 RCA 对混凝土的影响，但对于混凝土废料的来源和粉碎过程如何影响 RCA 特性的研究非常有限。本文旨在研究三种不同的粉碎和筛分工艺（简单筛选、破碎和研磨）对从混凝土砌块废物中获得的 RCA 的组成、形状和孔隙特性的影响。破碎和研磨会降低 RCA 的孔隙率。然而，由于原始混凝土砌块混合物中存在粗石英圆形河卵石，形状特征恶化。同时还产生了大量的粉末（<0.15 毫米），其中没有检测到无水水泥。
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