EXPERIMENTAL STUDY OF DAMAGE PROPERTIES OF DIFFERENT AGES CONCRETE UNDER MULTIPLE IMPACT LOADS
LI Xibing1，WANG Shiming1，GONG Fengqiang1，MA Haipeng1，ZHONG Fangping2
(1. School of Resources and Safety Engineering，Central South University，Changsha，Hunan 410083，China；
2. Hunan Provincial Changsha—Xiangtan Expressway Construction and Development Co.，Ltd.，Changsha，Hunan 410219，China)
Abstract：In order to understand the damage properties of different ages concrete under multiple impact loads systematically，the impact compression tests of 5 early ages concrete were conducted with a large diameter split Hopkinson pressure bar. The damage properties were analyzed by the statistical damage theory based on Weibull distribution to systematically study the damage law of concrete induced by repeated impact loads. The results show that，under the impact condition of 75% critical incident energy，the first time impact could improve the compressive strength of each age concrete. Then，the compressive strength and deformability become weaker with the increasing impact times. The damage-strain curve of concrete displayed different damage properties with the growth of ages. The sensitivity of damage to incident energy decreased. There was no obvious changes of cumulative damage when sample was broken as the age increased，almost at 1.00. However，the peak damage decreased logarithmically as the age increased. Peak damage at stable age indicated that the damage properties can be presented by the statistical damage model based on Weibull distribution.
李夕兵1，王世鸣1，宫凤强1，马海鹏1，钟放平2. 不同龄期混凝土多次冲击损伤特性试验研究[J]. 岩石力学与工程学报, 2012, 31(12): 2465-2472.
LI Xibing1，WANG Shiming1，GONG Fengqiang1，MA Haipeng1，ZHONG Fangping2. EXPERIMENTAL STUDY OF DAMAGE PROPERTIES OF DIFFERENT AGES CONCRETE UNDER MULTIPLE IMPACT LOADS. , 2012, 31(12): 2465-2472.
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2012, Vol. 31 
