【摘要】 考虑再生粗骨料取代率与聚丙烯纤维体积率的影响，开展了再生混凝土快速碳化以及碳化后的毛细吸水试验研究。试验结果表明：混凝土碳化深度随着再生粗骨料取代率的增加而增大，随聚丙烯纤维体积率增大呈先下降后上升的趋势，纤维会降低再生混凝土的碳化深度。再生混凝土毛细吸水系数随碳化程度的增加先减小后增大；随再生粗骨料取代率增加而增大；随聚丙烯纤维体积率增加先降低后增大。碳化对再生混凝土初始毛细吸水系数的影响大于后期吸水系数，且混凝土孔隙率越大，碳化对初始吸水系数的影响越显著。最后，建立了考虑碳化影响的再生混凝土初始毛细吸水系数预测模型。更多还原

【Abstract】 Considering the influence of the replacement ratio of recycled coarse aggregate and the volume ratio of polypropylene fiber,the rapid carbonization of recycled concrete and the capillary absorption of carbonated concrete were studied.The results show that the carbonation depth of concrete increases with the increase of the replacement rate of recycled coarse aggregate,decreases first and then increases with the increase of the volume rate of polypropylene fiber,and the carbonation depth of recycled concrete decreases with the increase of the fiber content.The capillary water absorption coefficient of recycled concrete decreases first and then increases with the increase of carbonation degree,increases with the increase of the replacement rate of recycled coarse aggregate and decreases first and then increases with the increase of the volume rate of polypropylene fiber.The effect of carbonation on the initial water absorption coefficient of recycled concrete is greater than that of the later,and the bigger the porosity of concrete is,the more significant the effect of carbonation on the initial water absorption coefficient is.Finally,a prediction model of initial capillary water absorption coefficient of recycled concrete considering the effect of carbonation is established.更多还原