Abstract

The cementation of Yellow River silt into green and sustainable building materials through microbial induced calcium carbonate precipitation (MICP) is a novel technology with a wide range of applications. The MICP treatment of abandoned Yellow River silt was carried out by multiple-phase injection method and pre-mixing method in this paper. The effects of cementation solution concentration and treatment times on the chemical conversion efficiency were investigated, and the effectiveness of the two treatment methods in improving the mechanical properties of Yellow River silt was evaluated. The results showed that the chemical conversion efficiency of the pre-mixing method was about 5% higher than that of the multiple-phase injection method. With the increase of the cementation solution concentration and the treatment times, the unconfined compressive strength (UCS) of the samples treated by the pre-mixing method increased faster and the distribution of calcium carbonate (CaCO₃) was more uniform. After ten treatments, the UCS of the samples treated by pre-mixing method exceeds 5 MPa with a relatively uniform CaCO₃ content of 25%.

摘要

通过微生物诱导碳酸钙沉淀（MICP）将黄河淤泥胶结成绿色和可持续的建筑材料是一项具有广泛应用的新技术。本文采用多相注入法和预混法对废弃黄河淤泥进行MICP处理。考察了胶结液浓度和处理次数对化学转化效率的影响，评价了两种处理方法改善黄河淤泥力学性能的有效性。结果表明，预混合法的化学转化效率比多相注入法提高了约5%。随着胶结液浓度和处理次数的增加，₃）更均匀。经10次处理后，预混法处理的样品UCS均超过5 MPa，CaCO ₃含量相对均匀，为25%。