Using microbial carbonate precipitation to improve the properties of recycled aggregate

被引：64

作者：

Zeng, Weilai ^{[1
,2
]}

Zhao, Yuxi ^{[1
]}

Poon, Chi Sun ^{[2
]}

Feng, Zhangyao ^{[1
]}

Lu, Zhenmei ^{[3
]}

Shah, Surendra P. ^{[4
]}

机构：

[1] Zhejiang Univ, Inst Struct Engn, Hangzhou 310058, Zhejiang, Peoples R China

[2] Hong Kong Polytech Univ, Dept Civil & Environm Engn, Hung Hom, Kowloon, Hong Kong, Peoples R China

[3] Zhejiang Univ, Coll Life Sci, Hangzhou 310058, Zhejiang, Peoples R China

[4] Northwestern Univ, Ctr Adv Cement Based Mat, Evanston, IL 60208 USA

来源：

CONSTRUCTION AND BUILDING MATERIALS | 2019年 / 228卷

基金：

中国国家自然科学基金;

关键词：

Recycled aggregate; Recycled aggregate concrete; Microbial carbonate precipitation; Modification; MECHANICAL-PROPERTIES; COMPRESSIVE STRENGTH; CONCRETE AGGREGATE; WASTE CONCRETE; DURABILITY; MICROSTRUCTURE; DEPOSITION; BEHAVIOR;

D O I：

10.1016/j.conbuildmat.2019.116743

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

This paper attempts to find an efficient precipitation method to modify recycled aggregates (RAs) with microbial carbonate precipitation and investigate the modification effect of RAs on the properties of the recycled aggregate concrete (RAC). Firstly, laboratory prepared concrete cubes were prepared as model RAs to compare the effectiveness of different precipitation methods, considering calcium-source addition methods and ways of rotation treatment. Based on the tested results, an efficient precipitation method was proposed. Secondly, the industrial sourced RAs were modified by the proposed precipitation method, and cast into concrete. The bio-modified RAC showed higher compressive strength because of the enhancement of the microhardness of the interfacial transition zones after modification. (C) 2019 Elsevier Ltd. All rights reserved.

引用

页数：9

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