关键词: 再生粗骨料;改性剂;废旧橡胶粉;力学性能;抗冻性

Abstract: Using span 40 and sodium dodecyl benzene sulfonate as two different types of modifier ( surfactant ) to modify waste tire rubber powder , mixed into recycled concrete , the concrete mechanical properties and frost resistance were tested .The effects of two kinds of modifiers on the modification of rubber powder and the effect of particle size and content of rubber powder on concrete were analyzed .The results shows that the modifier has a positive effect on the performance of rubber recycled coarse aggregate concrete, which improves the shortcomings of low compressive strength of rubber concrete and has a beneficial effect on the freeze-thaw cycle .When the rubber powder modified by span 40 , particle size was mesh 80 and 6%content acted outstanding .

Key words: recycled coarse aggregate;modifier;waste rubber powder;mechanical property;frost resistance property