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Characterization of Demolished Concretes with Three Different Strengths for Recycling as Coarse Aggregate
Minerals ( IF 2.5 ) Pub Date : 2021-07-26 , DOI: 10.3390/min11080803
Carlos Hoffmann Sampaio , Bogdan Cazacliu , Weslei Ambrós , Márcio Kronbauer , Rejane Tubino , Denise Dal Molin , Josep Oliva Moncunill , Gérson Miltzarek , Regis Waskow , Viviane dos Santos , Luis Silva

This paper presents a physical characterization for the recycling into new concretes of three comminuted concretes: C16/20 (“ordinary concrete”), C50/60 (“high strength concrete”), and C70/85 (“very high strength concrete”). The top size of the crushed concretes was 19.1 mm and the size range was 4.75 to 19.1 mm. The characterization was carried out with coarse aggregate liberation, to be prepared and concentrated in a gravity concentration process. The density distribution of the coarse aggregate, cement paste, and sand was carried out in different size ranges (4.75/19.1 mm; 4.75/8.0 mm; 8.0/12.5 mm; and 12.5/19.1 mm) for the three concretes studied. The form factor of the samples, as well as the porosity determination of particles in different density ranges, are presented. The obtained results indicate that the coarse aggregate liberation was more intensive for the low resistance concrete (C16/20), but a reasonable coarse aggregate recovery is possible for all concretes.

中文翻译:

三种不同强度拆除混凝土作为粗骨料回收利用的表征

本文介绍了将三种粉碎混凝土回收到新混凝土中的物理特性:C16/20(“普通混凝土”)、C50/60(“高强度混凝土”)和 C70/85(“超高强度混凝土”) . 破碎混凝土的最大尺寸为 19.1 毫米,尺寸范围为 4.75 至 19.1 毫米。表征是在粗骨料释放的情况下进行的,在重力浓缩过程中制备和浓缩。对于所研究的三种混凝土,粗骨料、水泥浆和沙子的密度分布在不同的尺寸范围内(4.75/19.1 毫米;4.75/8.0 毫米;8.0/12.5 毫米;和 12.5/19.1 毫米)。介绍了样品的形状因子,以及不同密度范围内颗粒的孔隙率测定。
更新日期:2021-07-26
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