Bacterial Treatment of Recycled Concrete Aggregate

IF 4.6 Q2 GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY Recycling Pub Date : 2023-09-09 DOI:10.3390/recycling8050068
Austen Rowell, Tewodros Ghebrab, Randall Jeter
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Abstract

Microbial treatment of recycled concrete aggregate (RCA) may improve the quality of the aggregate, and enhance its use in the production of structural concrete and promote the recycling of concrete waste. The mortar phase of the RCA is responsible for the poor performance of the aggregate. Treating the old adhered mortar or removing it from the natural aggregate (NA) is an option to make RCA beneficial for the production of quality recycled aggregate concrete (RAC). Removing the adhered mortar from recycled concrete aggregate using silicate-solubilizing bacteria was investigated. The bacteria could synthesize the silicates in the calcium silicate hydrate phase of the cement paste leading to the breakdown of the old adhered mortar. Four SSB strains were tested for survivability and activity in an alkaline medium to simulate the concrete environment. The Serratia marcescens bacterial strain, which survived the environment, was inoculated into screw-cap glass vials containing recycled concrete aggregate fragments and glucose-enhanced nutrient broth and then incubated for 14 days. Partial removal of the old adhered mortar was observed based on the weight lost from the RCA. The S. marcescens bacterial strain could survive the alkaline concrete environment and solubilize the silicates present in cement paste resulting in the removal of the old adhered mortar.
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再生混凝土骨料的细菌处理
微生物处理再生混凝土骨料(RCA)可以提高骨料的质量,提高其在结构混凝土生产中的应用,促进混凝土废料的回收利用。RCA的砂浆阶段是造成骨料性能差的原因。处理旧粘结砂浆或将其从天然骨料(NA)中去除是使RCA有利于生产优质再生骨料混凝土(RAC)的一种选择。研究了利用硅酸盐增溶菌去除再生混凝土骨料中的粘结砂浆。细菌可以合成水合硅酸钙相的硅酸盐,导致旧粘结砂浆的破裂。在模拟混凝土环境的碱性培养基中,测试了4株SSB菌株的生存能力和活性。将在环境中存活下来的粘质沙雷氏菌菌株接种到装有再生混凝土骨料碎片和葡萄糖增强营养肉汤的螺旋盖玻璃瓶中,培养14天。根据RCA的重量损失,观察到旧粘结砂浆的部分去除。该菌株能在碱性混凝土环境中生存,并能溶解水泥浆中的硅酸盐,从而去除旧粘结砂浆。
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来源期刊
Recycling
Recycling Environmental Science-Management, Monitoring, Policy and Law
CiteScore
6.80
自引率
7.00%
发文量
84
审稿时长
11 weeks
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