Influence of mixed recycled aggregate on the physical - mechanical properties of recycled concrete

被引:244
作者
Medina, Cesar [1 ]
Zhu, Wenzhong [2 ]
Howind, Torsten [2 ]
Sanchez de Rojas, Maria Isabel [3 ]
Frias, Moises [3 ]
机构
[1] Univ Extremadura, UEX CSIC Partnering Unit, Sch Engn, Dept Construct, Caceres 10071, Spain
[2] Univ West Scotland, Sch Engn, Paisley PA1 2BE, Renfrew, Scotland
[3] Eduardo Torroja Inst Construct Sci, Madrid 28033, Spain
关键词
Mixed recycled aggregate; Floating particles; Mechanical properties; Sorptivity; Concrete housing applications; DEMOLITION WASTE; MINERALOGICAL CHARACTERIZATION; CURING CONDITIONS; CEMENT CONCRETE; DURABILITY; PERFORMANCE; CONSTRUCTION; STRENGTH; FRESH;
D O I
10.1016/j.jclepro.2014.01.002
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
This article discusses the findings of a feasibility study on the partial replacement of natural coarse aggregate with a poor quality recycled aggregate from construction and demolition waste in the manufacture of concrete of 30 MPa strength grade. The mixed recycled aggregate used had a high asphalt and floating material content. Workability, density, compressive and tensile strength, water absorption and sorptivity were studied in a series of concretes containing 25 or 50% of the recycled aggregate with and without floating materials. The results showed that using up to 50% of the recycled aggregate had no adverse effects on fresh concrete workability. Most of the physical and mechanical properties of hardened concrete (strength, density, sorptivity and water absorption) were observed to decline with rising recycled aggregate replacement ratios and floating particle content. Overall, considering the strength and other properties achieved, the concretes containing the mixed recycled aggregates studied were found to be apt for housing construction. The technical, economic and environmental improvements stemming from the potential replacement of natural coarse aggregate with such recycled construction and demolition waste would contributed to the sustainability of the construction industry. (c) 2014 Elsevier Ltd. All rights reserved.
引用
收藏
页码:216 / 225
页数:10
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