Abstract

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Title:: Research on Design Parameters of Mix Proportion for Recycled Aggregate Concrete

Author(s):: GAO Dan-ying; ZHANG Li-juan; LU Jing-yun; YAN Zhao-qiang; Research Center of New Style Building Material ＆ Structure, Zhengzhou University

Keywords:: recycled aggregate concrete; mix proportion; watercement ratio; unit water content; sand ratio; compressive strength

Abstract:: The influences of properties of recycled coarse aggregate on the key parameters of mix proportion design for recycled aggregate concrete, including watercement ratio, unit water content and sand ratio, were discussed through the mixture proportion tests. The formulas for calculating the key parameters of mix proportion for recycled aggregate concrete were established through the statistical analysis of test results, which considered the influences of replacement ratio of recycled aggregates in the waterbinder ratio formula, water absorption and replacement ratio in the unit water content formula, and void fraction, apparent density and replacement ratio in the sand ratio formula. The results indicate that the replacement ratio, void fraction and water absorption of recycled aggregates have significant effect on the mix proportion of recycled aggregate concrete. The obtained formulas have simple forms, and reflect the characteristics of recycled aggregate, enhance the mix proportion design accuracy, and can provide reference for mix proportion design of recycled concrete.