Mechanical Properties of Pre-cracked Cement-stabilized Crushed Stone Molded by Dynamic and Static Methods
DUAN Kairui1, GAO Yingli1, ZHOU Wenjuan1, PEI Ganpeng1, HE Bei2
1 School of Traffic and Transportation Engineering, Changsha University of Science and Technology, Changsha 410114, China 2 Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education, School of Materials Science and Engineering, Tongji University, Shanghai 201804, China
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%.
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2020, Vol. 34 
