Study on effect of compressive strength of recycled aggregate concrete with water cement ratio

Water cement ratio on effects of compressive strength of natural and recycled aggregate concrete were examined.The results show that compressive strength of concrete concerns water cement ratio very nearly.When water cement ratio is above 0.57,compressive strength of recycled aggregate concrete decreases with water cement ratio increased.This rule is similar to one of natural concrete.However,when water cement ratio is below 0.57,compressive strength of recycled aggregate concrete increases with water cement ratio increased.The rule which the velocity of ultrasonic sound and rebound number of natural and recycled aggregate concrete change with water cement ratio is the same as one of compressive strength of both concrete respectively.