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本文在分析文献的基础上,综述和分析了再生混凝土的耐久特征及其改善措施,主要包括再生混凝土的抗渗性、抗冻融性、碳化以及耐磨性。总体来讲,再生混凝土的耐久性较普通混凝土差。但是,通过减小水灰比、掺加粉煤灰、采用二次搅拌工艺、减小再生骨料最大粒径和采用半饱和状态的再生骨料等措施可以改善再生混凝土的耐久性。最后,提出了关于再生混凝土耐久性需要进一步研究的问题。
Based on the analysis of the literature, this paper reviews and analyzes the durable characteristics of recycled concrete and its improvement measures, including the impermeability, freeze-thaw resistance, carbonization and wear resistance of recycled concrete. In general, the durability of recycled concrete worse than ordinary concrete. However, the durability of recycled concrete can be improved by reducing the ratio of water to cement, adding fly ash, using secondary mixing process, reducing the maximum size of recycled aggregates and using recycled aggregates in semi-saturated state. Finally, the issue of further research on the durability of recycled concrete is proposed.