ZHANG Yan-hong, HU Xiao, YANG Chen, LI Chun-lei, ZHU Hong-dong, JIAO Jian

Earthquake Engineering Research Center, China Institute of Water Resources and Hydropower Research, Beijing 100044, China

Abstract: Axial tension test is the most direct way to determine the tensile properties of concrete. In this paper, dynamic axial tension test of fully-graded concrete is firstly carried out on the material testing ma chine in IWHR, China. The hinge components are set between the specimen and the testing machine to eliminate the influence of additional bending moment during tension, and appropriate measures are also taken to mitigate the effects of eccentricity in the test. Twenty fully-graded large specimens and twenty-three wet-sieving small specimens are divided into three groups according to their casting date. The results show that the aggregate effect and the size effect of concrete axial tensile strength are significant, and their effects on the static axial tensile strength are greater than those on the dynamic axial tensile strength. Under impact loads, aggregate damage increases. Rate effects of axial tensile strength and limit tensile strain are greater than that of axial tensile elastic modulus. With decreasing of the axial tensile strength, the rate effect increases greatly.

Key words: axial tension, concrete, fully-graded large specimen, wet-sieving small specimen, loading rate

Published in: Journal of Hydraulic Engineering, Vol. 45, No. 6, 2014