关键词: 等体积砂浆法;力学性能;抗冻性能

Abstract: Equivalent volume mortar method (EMV method) was a new method proposed by Canadian scientists in recent years for recycled concrete .But it was failed to put into practical application because its poor ease of work.The purpose of this experiment was to optimize the method by adding high efficiency water reducing agent and fly ash on the basis of the original EMV method .The modified EMV method and the traditional alternative method were used to prepare the recycled concrete with different mix ratio, and compared with the ordinary concrete of the reference group , the mechanical properties and the frost resistance were analyzed.The results show that the performance of the recycled concrete prepared by the improved equal volume mortar method has been greatly improved .The variation law of compressive strength of recycled concrete cubes prepared by equal volume mortar method are basically the same as those of ordinary concrete, while the the traditional replacement method has lower strength .At the same time, according to the mass lose rates and the relative dynamic modulus of elasticity , it is found that the frost resistance of the recycled concrete prepared by the improved EMV method is better than the recycled concrete prepared by the traditional replacement method .

Key words: equivalent volume mortar method(EMV);mechanical property;frost resistance