Method for synergistically enhancing strength of recycled concrete aggregate by composite microorganisms

Abstract

The invention discloses a method for synergistically enhancing the strength of a recycled concrete aggregate by composite microorganisms. The method comprises: A, hydrolyzing urea through Bacillus pasteurii to obtain carbonate, hydrolyzing an organic phosphate monoester through bacillus subtilis to obtain phosphate ions and preparing a microorganism composite bacterial solution a from the two solutions, B, immersing a recycled concrete aggregate in the composite bacterial solution a, C, adding equimolar calcium ions into the solution for a reaction to obtain a calcium carbonate-hydroxyapatitecomposite gel material, and D, mixing the composite bacterial solution a, the equimolar calcium ions and cement mortar and mixing the mixture and the recycled concrete aggregate. After mixing of the composite bacterial solution a, the produced hydroxyapatite and calcium carbonate fill gaps of the recycled concrete aggregate. In the growth and reproduction of Bacillus pasteurii, urease is producedand fast hydrolyzes the urea into carbonate and ammonium ions and the ions are bonded to calcium ions so that calcium carbonate gel is produced. The bacillus subtilis produces alkaline phosphatase inthe growth and reproduction and the alkaline phosphatase hydrolyzes the organic phosphate monoester so that phosphate ions are obtained. The method can effectively strengthen the recycled concrete aggregate.

Description

technical field [0001] The invention relates to a method for synergistically enhancing the strength of recycled concrete aggregates by compound microorganisms. Background technique [0002] In the traditional recycled aggregate thermal insulation wall, cement mortar is used to mix the recycled material aggregate to fill the interior of the thermal insulation wall. Since the particle size of the recycled aggregate is not uniform, and the strength of the material is not as good as that of the new material, how to strengthen its structural strength is a difficult problem in the industry. . Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a method for synergistically enhancing the strength of recycled concrete aggregates by compound microorganisms, which can enhance the strength of recycled concrete aggregates in a more environmentally friendly manner. [0004] For this reason, the method that composite microorganism...

AI Technical Summary

Problems solved by technology

[0002] In traditional recycled aggregate thermal insulation walls, cement mortar is used to mix recycled material aggregates to fill the interior of the thermal insulation wall. Since the particle size of recycled aggregates is uneven, and the strength of the material is not as good as that of new materials, how to strengthen its structural strength is a difficult problem in the industry.