再生混凝土抗碳化性能的研究

系统研究了水胶比、水泥用量、再生粗集料性能、矿物掺和料、再生粗集料取代率、荷载水平等因素对再生混凝土碳化性能的影响.试验表明:再生混凝土的碳化性能不仅受新砂浆的影响,而且还受再生粗集料取代率及其自身强度的影响;矿物掺和料取代水泥使得再生混凝土的碳化深度增大;应力水平对再生混凝土碳化过程产生重大影响.

Research on Carbonation Resistance of Recycled Aggregate Concrete

A study of carbonation resistance when recycled coarse aggregates were used to make new concrete was conducted.Effects of water-binder ratios(m_w/m_b),cement content,the kinds of mineral admixture,the quality of recycled coarse aggregates,recycled coarse aggregate replacement rate for natural coarse aggregates and loading levels on the carbonation behavior of recycled concrete were evaluated by accelerated carbonation experiments.The results show that carbonation behavior of recycled concrete is not only determined by the quality of new mortar but also by the quality and quantity of recycled coarse aggregates,the addition of mineral admixture replacing cement partially seems to accelerate carbonation;its loading levels may have a significant impact on the propagation of the carbonation.