1 College of Civil Engineering, Qingdao University of Technology, Qingdao 266033, China; 2 Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering, College of Civil Engineering, Shenzhen University, Shenzhen 518060, China
Abstract: The porous interfacial transition zone of the aggregate-cement slurry is an important reason for the difference between the properties of recycled aggregate and natural aggregate. The effect of microbial mineralization deposition on interfacial transition zone of recycled aggregate was studied. Cement paste was used to wrap recycled aggregate treated by different bacteria in different ways. After curing, the aggregate-cement interface transition zone was obtained by crushing. SEM was used to observe the changes in the microstructure of the interface transition zone. The elastic modulus and hardness of the interface transition zone were measured by nano indentation instrument. Combined with the compressive and flexural strength test results of reclaimed mortar blocks, the improvement effect of microbial mineralization deposition on interfacial transition zone of recycled aggregate was analyzed. The results showed that the recycled aggregate was treated with bacillus pseudoadamus and bacillus basophilus. The compressive and flexural strength of the recycled mortar prepared and the elastic modulus and hardness of the interfacial transition zone of recycled aggregate were significantly increased. The different mineralization capacity of the two strains leads to the difference of performance improvement effect.
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2020, Vol. 34 
