文章基本信息

标题：Mechanical Performance of Eco-Friendly Concretes with Volcanic Powder and Recycled Concrete Aggregates
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作者：Letelier, Viviana ; Ortega, José Marcos ; Tarela, Ester 等
期刊名称：Sustainability
印刷版ISSN：2071-1050
出版年度：2018
卷号：10
期号：9
页码：1-17
出版社：MDPI, Open Access Journal
摘要：At present, reducing the environmental impact of the construction industry is a major subject of study. In terms of the use of recycled concrete aggregates (RCA), most recently conducted studies have shown that the use of a limited percentage of those aggregates does not significantly affect the properties of concretes. This work analysed the mechanical properties of medium-strength concretes with a high contribution to sustainability, where cement and natural coarse aggregates (NCA) were partially replaced by volcanic powder (VP) and RCA, respectively. Three mixing ratios of VP replacement were tested in concretes without RCA and concretes with 30% RCA replacing NCA. Results show that when VP is used without RCA, up to 10% of the cement can be replaced by VP without a significant loss in the mechanical properties. When a combination of 5% VP and 30% RCA is used, the weakness of the recycled concrete is strengthened, obtaining stronger concretes than a control concrete with no recycled materials. Finally, the greenhouse gas assessment showed that the simultaneous incorporation of VP and RCA reduces CO 2 emissions produced in the manufacture of concrete by up to 13.6%.
关键词：volcanic powder; recycled aggregates; eco-friendly concrete; sustainability; mechanical performance; Young’s modulus