Preparation method and application of biological calcium carbonate uniformly reinforced recycled aggregate: Fid-Bau Portal

Preparation method and application of biological calcium carbonate uniformly reinforced recycled aggregate

WANG JIANYUN / ZHANG RUI / XIE DEZHI

The invention provides a preparation method of a biological calcium carbonate uniformly reinforced recycled aggregate. The preparation method comprises the following steps: (1) pretreating the recycled aggregate; (2) uniformly fixing carbonate mineralizing bacteria on the whole surface of the recycled aggregate; (3) depositing biological calcium carbonate on the whole surface of the recycled aggregate; and (4) drying. A network structure formed after the thickening agent and calcium ions are chelated is used for effectively wrapping bacteria, carbonate mineralizing bacteria are uniformly fixed on the whole surface of the recycled aggregate, and biological calcium carbonate is formed by taking the mineralizing bacteria as nucleation sites, so that in-situ deposition of the biological calcium carbonate on the surface of the recycled aggregate is realized; the distribution uniformity of the biological calcium carbonate on the surface of the recycled aggregate is improved, and the water absorption rate and the crushing value of the recycled aggregate are further reduced, so that the utilization rate of the recycled aggregate in the concrete is improved, the sustainable development of the concrete is realized, and the large-scale application of the recycled aggregate in the concrete field is promoted.

本发明提供了一种生物碳酸钙均匀强化再生骨料的制备方法，包括以下步骤：(1)再生骨料的预处理；(2)碳酸盐矿化菌在再生骨料全表面的均匀固定；(3)生物碳酸钙在再生骨料全表面的沉积；(4)烘干。本发明通过利用增稠剂与钙离子螯合后形成的网络结构，有效包裹细菌，并将碳酸盐矿化菌均匀地固定于再生骨料全表面，由于生物碳酸钙形成是以矿化菌作为成核位点的，从而实现生物碳酸钙在再生骨料表面原位沉积，提高生物碳酸钙在再生骨料表面的分布均匀性，进一步降低再生骨料的吸水率和压碎值，从而提高再生骨料在混凝土中的利用率，同时实现混凝土的可持续发展，促进再生骨料在混凝土领域中的规模化应用。

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