动静态成型条件下预裂水稳碎石的力学特性

doi:10.11896/cldb.19040164

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Abstract Skeleton dense cement-stabilized crushed stone was prepared by static pressing (SP) and vibration compaction (VC), respectively, and then the vibration machine was used to crack them at the early curing stage. The development of the pre-cracking degree, mechanical, dry shrinkage and crack resistance performance of specimens were studied. The results showed that pre-cracking degree increased firstly then decreased with the increase of vibration time and the pre-cracking degree of SP specimen was higher than that of the VC specimen; self-healing ability of the VC specimen was better than that of the SP specimen and the indirect tensile strength recovery of SP specimen was the worst; after the pre-cracking treatment, dry shrinkage strain of VC and SP specimen was reduced by at most 35.8% and 35.3%, respectively; the crack resistance of specimens was improved by nearly 2—3 times through the treatment of pre-cracking. It was easier to form the stable structure of “cement-coarse aggregate-fine aggregate” and ideal pre-cracks for VC specimen. Thus, the optimal parameters are: vibration forming, pre-cracking time of 2 d, pre-cracking degree of 30%.

Key words： cement-stabilized crushed stone forming methods pre-cracked mechanical properties

Published: 26 April 2020

CLC number:

TU502

Fund:This work was financially supported by the Joint Fund of the National Natural Science Foundation of China and the China Civil Aviation Administration (U1833127), Natural Science Foundation of Hunan Province (2018JJ4016), Key Scientific Research Projects of Hunan Education Department (18A129).

Corresponding Authors: Yingli Gao,Ph.D., master's supervisor, vice president and professor in School of Traffic and Transportation Engineering of Changsha University of Science and Technology, more than 100 academic papers has been published, among which, more than 50 papers can be indexed by SCI, EI and ISTP. His interests are high performance functional materials for pavement and new materials.

About author:: Kairui Duan,master degree candidate in Changsha University of Science and Technology. His interest is cement-based materials.

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	DUAN Kairui
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	ZHOU Wenjuan
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	HE Bei

Cite this article:

DUAN Kairui,GAO Yingli,ZHOU Wenjuan, et al. Mechanical Properties of Pre-cracked Cement-stabilized Crushed Stone Molded by Dynamic and Static Methods[J]. Materials Reports, 2020, 34(10): 10068-10075.

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http://www.mater-rep.com/EN/10.11896/cldb.19040164 OR http://www.mater-rep.com/EN/Y2020/V34/I10/10068

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