Experimental Study on MICP Repair of Sulphoaluminate Cement Mortar
[Purposes]Microbially Induced Carbonate Precipitation(MICP)was used to conduct repair ex-perimental research on thioaluminate cement products after corrosion damage.[Methods]The erosion failure experiment was carried out by simulating the failure of the actual thioaluminate cement products,and the damaged test blocks were repaired by MICP technology.In order to ensure the full reaction,the cyclic treatment method of first soaking,drying and then soaking were used to form a pressure difference between the solution and the drying test blocks,and uniformly entered the test blocks through the capil-lary action.The effectiveness of MICP repair was explored by monitoring the mass and strength changes of test blocks.[Findings]With the continuous increase of the number of repairs,the mass of the test blocks increased by 4%compared with the untreated after 12 repairs,and the compressive strength in-creased by 1 131%.It can be seen from the test that MICP technology can significantly avoid the mass loss and improve the compressive strength of the deteriorated test blocks.[Conclusions]MICP technol-ogy is feasible for the repair of thioaluminate cement products after failure.
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