MICP技术改性古建筑灰浆实验研究

Experimental Study on Modification of Ancient Building Mortar with MICP Technology

通过微生物诱导方解石沉积(microbial induced calcite precipitation,简称MICP)技术,对与现存古建筑灰浆各项性能相似的铝酸盐水泥砂浆进行生物浸泡修复研究,进而探究古建筑灰浆的修复方法.在实验中为确保试块反应充分,采用先浸泡后烘干再浸泡的循环处理方式,使溶液与干燥试块之间形成压力差,并通过内部毛细作用均匀进入试块当中.通过对比处理前后试块抗压强度、抗折强度、质量、软化系数和试块吸水率的变化情况,综合评价MICP技术改良效果.结果表明:经MICP技术处理后,试块平均质量、抗压强度和抗折强度较未处理时分别提高4.3%、67.26%和116%;试块软化系数较未处理时提高10%,质量吸水率降低47.8%.

Microbial induced calcite precipitation(MICP)technology was used to conduct biological immersion repair research on aluminate cement mortar with similar properties to the existing ancient architectural mortar,so as to explore the repair method of ancient architectural mortar.In the experiment process,the cyclic treatment method of soaking first,drying and then soaking was adopted to form the pressure difference between the solution and the dry block,which ensures the solutions evenly enter the test block through the internal capillary action making full reaction.The improvement effect of MICP technology was comprehensively evaluated by comparing the changes in the compressive strength,rupture strength,mass,softening coefficient and water absorption of the test block before and after the treatments.The results shows that the average mass,compressive strength and rupture strength of the test blocks are increased by 4.3%,67.26%and 116%after treatment with MICP technology,respectively,comparing with the test blocks without treatment.The softening coefficient of the block is increased by 10%and the water absorption rate of the mass is reduced by 47.8%.