Abstract:In recent years, the microbial induced calcium carbonate precipitation (MICP) technology has received widespread attention in the field of the soil reinforcement. However, the comparative study on the mechanical properties of the MCP technology and the cement-solidified coral sand is still insufficient. In this test, in order to compare the mechanical properties of the MICP coral sand sample and the coral sand cement mortar sample, the failure form and the stress-strain curve of the two samples are analyzed, and their microstructures are compared through the SEM test. The test results reveal as follows: when the calcium carbonate/cement content inside the sample is less than 15%, the unconfined compressive strength of the MICP sample is significantly higher than that of the cement mortar sample; especially, when the calcium carbonate content is 5.3%, 7.7%, and 9.1%, the unconfined strength of the MICP sample is more than 200% of the strength of the corresponding cement mortar sample; when the calcium carbonate/cement content is higher than 15%, the difference between the two strengths is within 5% is within 5%. Meanwhile, there are apparent differences in the microstructure of the MICP sample and the coral sand cement mortar sample.