Modification of recycled concrete aggregate by calcium carbonate biodeposition

被引：262

作者：

Grabiec, Anna M. ^{[1
]}

Klama, Justyna ^{[2
]}

Zawal, Daniel ^{[1
]}

Krupa, Dana ^{[1
]}

机构：

[1] Univ Life Sci, Dept Theory Struct & Agr Bldg Engn, Fac Land Reclamat & Environm Engn, Poznan, Poland

[2] Univ Life Sci, Dept Gen & Environm Microbiol, Fac Agron & Bioengn, Poznan, Poland

来源：

CONSTRUCTION AND BUILDING MATERIALS | 2012年 / 34卷

关键词：

Recycled concrete aggregate; Microbial induced calcite deposition; Sporosarcina pasteurii; Water absorption; Whey; PRECIPITATION;

D O I：

10.1016/j.conbuildmat.2012.02.027

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

A growing demand for raw materials leads to danger of premature depletion of the natural sources. An alternative is to use by-products, provided their quality is improved. The paper presents surface modification of recycled aggregate concrete using biodeposition involving a method employing Sporosarcina pasteurii (Bacillus pasteurii) bacteria. It was possible to obtain reduction in water absorption of aggregate, the effect was more visible in case of finer fractions and for aggregates originating from inferior quality concrete. Calcium chloride was used for precipitation of calcium carbonate, while culture medium consisting of beef extract, peptone and urea was used for cultivation of microorganisms. In addition, whey, ecologically dangerous by-product from dairy industry was found to be effective as a culture medium. Presence of calcium carbonate crystals covering aggregate grains was confirmed by observations under scanning electron microscope. In the perspective, the proposed method, upon appropriate improvements, seems worthwhile due to ecological and technological reasons. (C) 2012 Elsevier Ltd. All rights reserved.

引用

页码：145 / 150

页数：6

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