再生粗骨料的形态及缺陷对再生混凝土干燥收缩和力学性能的影响

doi:10.11896/cldb.20100227

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Abstract The shapes, attached mortar and the microhardness of interface transition zone of recycled coarse aggregate prepared by three different processes were analyzed. And the effects of aggregate shapes and defects on drying shrinkage and mechanical properties were studied. Combining with the drainage characteristics, microhardness and failure patterns of aggregate, the difference of defects caused by different processes on recycled aggregate and its influence mechanism on drying shrinkage and mechanical properties of recycled concrete were discussed. The results show that comparing with jaw crusher, the aggregate prepared by impact crusher has better shape, less needle shape, and the content of attached mortar is obviously reduced. And the disc reshaping technology can further improve the aggregate shape and reduce the content of attached mortar on the aggregate surface. The mortar contained in recycled aggregate leads to high water absorption, which has a certain internal curing effect and reduce its early shrinkage, but the evaporation of water in the later period would lead to the increase of dry shrinkage of recycled concrete. The interfacial microhardness of recycled aggregate RA-C1 prepared by impact crusher is higher than that of RA-E prepared by Jaw crusher, and the strength of concrete prepared by impact crusher is higher than that of RA-E, while RA-C2 prepared by impact crusher and reshaping has the best interfacial properties, its mechanical properties are relatively low due to the low strength of aggregate.

Key words： recycled aggregate attached mortar defects of interface drying shrinkage

Published: 25 June 2021

CLC number:

TU528

Fund:This work was financially supported by the Natural Science Foundation of China (52078002, 51778003), Natural Science Research Project in Anhui Univer-sities (KJ2020A0476), Key Research and Development Projects of Anhui Province (202004b11020033).

About author:: Daosheng Sun received his B.E. degree in building materials and products from Chongqing University in 1986 and received his Ph.D. Degree in materials from the Nanjing Tech University in 2004. He was granted professor in 2005. He is the tutor of Anhui Jianzhu University and Hefei Institute of Physical Science, Chinese Academy of Sciences. He is the member of Anhui Silicate Society, Anhui Cement Standard-ization Technical Committee and Anhui Cement Association. His research interests include high performance concrete, comprehensive utilization of solid waste, and advanced building materials.Kaiwei Liu got his B.E. degree in materials chemistry in Nanjing Tech University in 2009 and got Ph.D. Degree in materials in Nanjing Tech University in 2014. He has hosted and participated in more than 10 Provincial or ministerial level research projects including National Natural Science Foundation of China, Natural Science Foundation of Higher Education of Anhui Pro-vince (Key Program), Open Project of State Key Laboratory of High Performance Civil Engineering Materials, Open Project of State Key Laboratory of Materials and Chemical Engineering. He also participated in the preparation of “Cement and Concrete Materials in Marine Engineering” and won the second prize of China Power Construction Science and Technology Award.

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	SUN Daosheng
	LI Zeying
	LIU Kaiwei
	WANG Aiguo
	HUANG Wei
	ZHANG Gaozhan

Cite this article:

SUN Daosheng,LI Zeying,LIU Kaiwei, et al. Influence of Shapes and Defects in Recycled Aggregate on Drying Shrinkage and Mechanical Properties of Recycled Aggregate Concrete[J]. Materials Reports, 2021, 35(11): 11027-11033.

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http://www.mater-rep.com/EN/10.11896/cldb.20100227 OR http://www.mater-rep.com/EN/Y2021/V35/I11/11027

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