Preliminary Study on the Proportion Design of Recycled aggregate Concrete
Zhang Yamei, Qin Honggen, Sun Wei, et al.
The approach for the proportion design of recycled aggregate concrete is investigated according to the experimental study. It is suggested that the proportion of cement, sand and aggregate can be calculated based on the current proportion design code for ordinary concrete. As regard to the water content, the water adsorption of waste concrete aggregate within certain time period should also be considered and added to the water content calculated according to the code for ordinary concrete. In addition, the using of good quality fly ash and superplasticizer can improve the strength of recycled aggregate concrete. The highest compressive strength of the concrete, in which all aggregate is insteaded by waste concrete aggregate, is up to 54.6MPa at 28days.