砂浆–花岗岩ITZ动态直接拉伸力学性能的试验研究

doi:10.13722/j.cnki.jrme.2017.1608

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Abstract The interfacial transition zone(ITZ) is considered to be the “weakest link” of concrete structures. To study the effect of different strain rates，aspect ratios，and surface roughness of the aggregate on the dynamic tensile properties of the mortar-granite ITZ，a large-diameter(? 75 mm) split Hopkinson tensile bar(SHTB) device was applied in dynamic direct tensile tests to mortar-granite composite specimens. Experimental results showed that the tensile strength of ITZ increased with the growth of strain rate. The tensile strength of ITZ is strain rate sensitive，which is closely related to the surface roughness of aggregates. The average tensile strength of ITZ decreased with the increasing of surface roughness of aggregates. Under the same loading pressure，the average tensile strength of ITZ declined significantly with the growth of aspect ratio，and the descent range was diminished with the increasing of aggregate surface roughness.

Key words： rock mechanics interfacial transition zone structural characteristics mechanical properties dynamic direct tension

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	Articles by authors
	JIANG Wei1
	LU Yubin1
	JIANG Xiquan2
	DUAN Junzhou1

Cite this article:

JIANG Wei1,LU Yubin1,JIANG Xiquan2, et al. Experimental study on dynamic direct tensile mechanical properties of mortar-granite ITZ[J]. , 2018, 37(8): 1905-1915.

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2017.1608 OR http://www.rockmech.org/EN/Y2018/V37/I8/1905

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