|Table of Contents|

Research Progress on Performance Enhancement of Recycled Aggregate from Construction Waste(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2022年06期
Page:
1-13
Research Field:
建筑材料
Publishing date:

Info

Title:
Research Progress on Performance Enhancement of Recycled Aggregate from Construction Waste
Author(s):
MA Shi-bin NIU Zong-yue LIU Yue-zhao WANG Peng
(School of Civil and Transportation Engineering, Hebei University of Technology, Tianjin 300401, China)
Keywords:
construction waste recycled aggregate reinforcement method attached mortar recycled concrete mixing process
PACS:
TU528
DOI:
10.19815/j.jace.2021.09011
Abstract:
In order to solve the problems of the weak interface transition zone, high water absorption and microcrack of recycled aggregate, the recycling process of recycled aggregate, the performance strengthening method and the mixing approach of recycled concrete were expounded in detail. The recycling process in each stage of recycled aggregate production was introduced, and the performance difference between recycled aggregate and natural aggregate was pointed out. According to the source of this performance difference, the performance strengthening methods were divided into two categories: removal of attached mortar and reinforcement of attached mortar. The principle, advantages, disadvantages and applicability of the strengthening methods were analyzed. Finally, the normal mixing approach(NMA)and the improved mixing approach(TSMAS, TSMASC)were introduced. Meanwhile, the principles and differences of them were expounded. The results show that the current recycling process mainly focuses on crushing and screening, which is easy to cause microcracks and old mortar layer adhesion. In the attached mortar removal technology, the pre-soaking in water and the autogenous cleaning process are simple and economical, but the strengthening effect is general. The strengthening effect of mechanical grinding and heating grinding has been improved, but the energy consumption is large. Acid treatment and thermo-chemical treatment are effective, but the acid concentration needs to be strictly controlled and the pollution is serious. In the attached mortar reinforcement technology, the pozzolanic slurry immersion process is simple and the materials are easy to obtain, but it will reduce workability. Emulsion polymer immersion can improve the workability, but it is hard to promote due to the complex process and equipment. Microbial mineralization and carbonation can effectively fill the microcracks and pores of attached mortar, which has great application prospects. However, there are uncertainty and lack of systematic research. Cement slurry coating needs a large amount of the cement and its strengthening effect is closely related to liquidity of the cement slurry. Immersion in sodium silicate solution will reduce the durability, and its concentration needs to be controlled.

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Last Update: 2022-12-20