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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.
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Received: 22 March 2012
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2012, Vol. 31 
