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汶川地震灾后重建项目是在不断发生的余震中开工建设的,余震是否会对在建建筑物造成损伤是共同关注的问题。对早龄期混凝土试块模拟不同峰值加速度的振动扰动,通过28d的抗压强度及超声波波速的比较,研究不同龄期的新浇混凝土受振动扰动后强度及损伤的变化规律。试验结果表明,在刚性模板的试验条件下,新浇混凝土在2d后受振对后期强度及损伤影响甚微。
The Wenchuan earthquake reconstruction project is started in the ongoing aftershocks, aftershocks will cause damage to the buildings under construction is a common concern. Vibration disturbances with different peak accelerations were simulated for early age concrete blocks. The compressive strength and ultrasonic wave velocity of 28 days were compared to study the variation of strength and damage of fresh concrete at different ages after vibration disturbance. The experimental results show that under the test conditions of rigid formwork, the fresh cast concrete has little effect on the strength and damage in the late stage after 2 days.