Mechanical properties and durability of bio-blocks with recycled concrete aggregates

被引：23

作者：

Javadi, Armin Saeedi ^{[1
]}

Badiee, Hassan ^{[1
]}

Sabermahani, Mohsen ^{[1
]}

机构：

[1] Iran Univ Sci & Technol, Sch Civil Engn, Tehran 16844, Iran

来源：

CONSTRUCTION AND BUILDING MATERIALS | 2018年 / 165卷

关键词：

Block; Calcium carbonate; Recycled concrete aggregate; Microbially induced calcite precipitation; Compression test; Durability; Water absorption; Thermal stability; CALCIUM-CARBONATE PRECIPITATION; SOIL IMPROVEMENT; HIGH-TEMPERATURE; SAND PARTICLES; CONSTRUCTION; CEMENT; BRICKS; BEHAVIOR; WASTE;

D O I：

10.1016/j.conbuildmat.2018.01.079

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

Harnessing bio-processes to improve the mechanical properties of building materials have gained interest in developing green construction. One of the bio-processes utilized to improve the mechanical properties of building materials is the bio-mineralization of calcium carbonate by the activity of the urease. positive bacterium. In this research, the recycled concrete aggregates, as one of the main constituents of construction and demolition wastes, were used to produce bio-blocks by the bio-mineralization of CaCO3 and the results were compared to bio-blocks produced with natural aggregates. Furthermore, the durability and mechanical properties of both types of bio-blocks were investigated. The difference in compressive strengths of bio-blocks made with both aggregates was less than 10%. The results showed that bio-mineralization reduced the water absorption of the RCA bio-blocks, which is one of the drawbacks of recycled concrete aggregates. In addition, durability tests revealed that the bio-blocks maintained their strength under freeze thaw cycles and high temperatures. (C) 2018 Elsevier Ltd. All rights reserved.

引用

页码：859 / 865

页数：7

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