腐蚀环境下再生混凝土结构耐久性设计研究

为推广耐久性设计在再生混凝土结构工程设计中的应用,在考虑再生粗骨料来源的复杂性和再生混凝土初始损伤的影响基础上,结合近年来我国再生混凝土结构相关研究与应用成果,根据普通混凝土结构耐久性设计原则,分析研究腐蚀环境条件下再生混凝土结构的耐久性设计问题,然后确立腐蚀环境条件下再生混凝土结构耐久性设计的基本方法。结果表明:在再生混凝土与普通混凝土强度等级相同的情况下,当30%再生粗骨料取代率≤50%及再生粗骨料取代率50%时,钢筋保护层厚度应适当分别增加3 mm和5 mm,而再生混凝土养护时间应适当分别延长24 h和48 h。

Study of durability design method for recycled concrete structures exposed to corrosion environment

In order to propose application of durability design technology in the design of recycled concrete structures to extend the applied field of durability design, the durability design of recycled concrete structure exposed to corrosion environment was analyzed based on the durability design of concrete structure, and the important achievements obtained on the study and application of recycled concrete structure in China. A basic design method for durable recycled concrete structure is presented in this paper. The environmental factor and the quality control requirement to guarantee the durability of recycled concrete structure are taken into consideration in the method. The results show that when the recycled coarse aggregate replacement ratio is 30%~50% and the recycled coarse aggregate replacement ratio is more than 50%, the protection cover of reinforcing bar should increase respectively 3 mm and 5 mm,and the curing time of recycled concrete should increase respectively 24 hour and 48 hour.