混菌矿化增强再生粗骨料的物理力学性能

Physical and Mechanical Properties of Recycled Coarse Aggregate Enhanced by Mixed Bacterial Mineralization

摘要:

为克服单一微生物培养成本高且矿化鲁棒性不足的缺陷，提出了一种混菌矿化增强再生粗骨料物理力学性能的方法.通过筛选矿化效率较高的好氧嗜碱混菌，考察了混菌矿化对再生粗骨料物理力学性能和混凝土抗压强度的影响.结果表明：相同增强时间下，混菌比纯菌呈现出更优异的矿化增强效果；随着混菌矿化增强时间的延长，再生粗骨料吸水率和压碎指标呈现出先减小后增大的趋势，最优增强时间为15 d；采用矿化增强再生粗骨料制备的再生混凝土抗压强度提高幅度达到22.1%.

Abstract:

To overcome the high cultivation cost and low robustness of single microorganism， a method of mixed bacteria mineralization to enhance the physical and mechanical properties of recycled coarse aggregate was proposed. A kind of aerobic mixed bacteria with high mineralization efficiency was selected. The effect of mixed bacteria mineralization on physical and mechanical properties of recycled coarse aggregates， and the compressive strength of recycled concrete was investigated. The results show that under the same enhancement time， mixed bacteria exhibit much better mineralization enhancement effect than pure bacteria. With the extension of the enhancement time of mixed bacteria mineralization， the water absorption and crushing index of recycled coarse aggregate decrease firstly， and then increase. The optimal enhanced time is 15 days. The compressive strength of recycled concrete prepared by mineralized reinforced recycled coarse aggregate increases by 22.1%.