微生物矿化沉积对再生骨料界面过渡区的影响

doi:10.11896/cldb.19020043

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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.

Key words： recycled aggregate microbial mineralization deposition interfacial transition zone nano indentation elastic modulus

Published: 12 March 2020

CLC number:

TU502

Fund:This work was financially supported by the National Natural Science Foundation of China (51578342), China Postdoctoral Science Fund Project (2015M582418).

About author:: Peizhen Xu, female, Ph.D., professor, master tutor, long-term engaged in structural seismic, engineering vibration control and construction waste resource utilization of related research work. Presided over the completion of 1 National Natural Fund projects, provincial Nature Fund projects 1, the Ministry of Education International Students Launch Fund project 1, postdoctoral research Fund 1, Qingdao Science and Technology Program Project 1 and other 5 longitudinal topics; Presided over the completion of more than 10 horizontal topics, 7 patents, including 2 invention patents, 5 utility model patents; the first author published more than 30 academic papers, of which EI included 8; Yaguang Zhu, Ph.D., associate professor, master tutor. Harbin Institute of Technology Mobile Station and Shenzhen University Workstation joint training in the station postdoctoral, China Green Building and Energy Conservation Committee member, China Building Waste Resources Chemical Group members. The main research interests are the resource utilization of construction waste and the construction control and safety eva-luation of large span bridges. Presided over and completed the key project of Qingdao Public Domain Science and Technology Support plan "Research and Application of Construction Waste Resource in the Construction of Qingdao World Horticultural Exposition Park",participate in the completion of the national "xv." Science and Technology Support Project sub-topic 1, the National "Eleven-Five" Science and Technology Support Project 1 projects, the National Natural Fund 2, won the third prize of Scie-nce and Technology in Shandong Province and Qingdao Science and Techno-logy Progress Second Prize, published more than 10 academic papers.

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	XU Peizhen
	CHEN Fabin
	LI Quanquan
	REN Yinan
	WU Chunran
	ZHU Yaguang

Cite this article:

XU Peizhen,CHEN Fabin,LI Quanquan, et al. Effect of Microbial Mineralization Deposition on Interfacial Transition Zone of Recycled Aggregate[J]. Materials Reports, 2020, 34(6): 6095-6099.

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http://www.mater-rep.com/EN/10.11896/cldb.19020043 OR http://www.mater-rep.com/EN/Y2020/V34/I6/6095

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