Service Life Prediction of Recycled Aggregate Concrete Based on Freezing-thawing Damage Model

摘要

Recycled aggregate concrete is gradually formed into important building materials on environment protection and sustainable development. Basic experimental research has been done to researched frost resistance of recycled aggregate concrete, and research work into law of concrete freezing-thawing cycle damage processes has been summarized by the principles of damage mechanic with relative dynamic modulus loss as damage variable. Service life of recycled aggregate concrete was predicted based on damage parabola model. It was concluded that strength, mass, and relative dynamic modulus all decreased in different levels, and argument fall of mass and relative dynamic modulus in recycled aggregate was less than common concrete, where argument fall of strength was higher than common concrete.