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Using Sodium Alginate Aided Bio-treatment for Improving the Uniformity of Precipitates on Recycled Aggregates by Rui Zhang; Kai Wu; Dezhi Xie; Jianyun Wang is a Biochemistry, Genetics and Molecular Biology article available to read on EtoBox.

What is Using Sodium Alginate Aided Bio-treatment for Improving the Uniformity of Precipitates on Recycled Aggregates about?

The recycled concrete aggregates have high porosity and water absorption, which hinders their utilization in concrete production. Microbial-induced calcium carbonate precipitation was regarded as a very promising method for strengthening recycled aggregates. However, the uneven distribution of CaCO 3 on surface of aggregates encountered in the current bio-deposition treatment weakened the efficiency, especially in the aspect of the decrease of water absorption. Therefore, this study innovatively applied a sodium alginate aided bio-deposition treatment to improve the uniform distribution of biogenic CaCO 3 . The principle was that sodium alginate was used to uniformly "fix" the bio-agents (urea or bacterial cells) on the surface of recycled aggregates, which was supposed to promote the uniform in-situ precipitation of CaCO 3 on the surface of aggregates, and hence effectively blocking surface pores, and reducing the water absorption of the aggregates. Two concentrations of sodium alginate (0.2w% and 0.5w%) and four sodium alginate aided bio-deposition treatments were studied. It was found that CaCO 3 (a mass increase of 4.05%) was formed on the aggregates after the suitable sodium a

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Author

Rui Zhang; Kai Wu; Dezhi Xie; Jianyun Wang

Publisher

Springer Science and Business Media LLC

Published

2023

Language

EN

Field

Biochemistry, Genetics and Molecular Biology (Life Sciences)