Experimental study on the Influence of Water Content in Concrete Dynamic Elastic modulus Test

摘要

The dynamic elastic modulus is an important damage assessment index of concrete structures induced by freezing-thaw cycle,fire and chemical attacks.Water content is one of key effect factors on the dynamic elastic modulus tested by the ultrasonic and bending vibration method.The regularity of dynamic elastic modulus changed with the water content of concrete specimens was analyzed in this paper.The results show that the ultrasonic velocity had a low sensitivity to water content when it is below 1.5％.The bending vibration method can better reflect the effect of water content change on dynamic elastic modulus.The regression equation of dynamic elastic modulus and water content was set up by introducing the index function.The research results offer technical reference for the predicting of actual concrete dynamic elastic modulus in different humidity environment.