腐蚀环境下再生混凝土结构耐久性试验研究
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摘要
再生混凝土结构能够有效的利用废弃混凝土材料,因此,相对于传统的混凝上结构来说,它具有节约天然石料资源、保护生态环境和良好的经济性等优点。在腐蚀环境作用下,再生混凝土结构将因其组成材料性能的退化而引起诸如结构抗力衰减、可靠性降低等耐久性问题的发生。从国内外当前的研究文献来看,相关再生混凝土结构耐久性方面研究的报道还较少,因此,研究腐蚀环境境再生混凝土结构的耐久性问题具有重要的工程与现实意义。
     论文对硫酸钠-干湿交替循环环境、冻融循环环境下再生混凝土的耐久性能,以及冻融循环环境作用下钢筋-再生混凝土粘结耐久性能进行了试验研究。通过试验,分析研究了腐蚀环境(介质腐蚀与冻融侵蚀)作用下再生混凝土自身、钢筋与再生混凝土间粘结性能的损伤演化过程与演化规律,并建立了再生混凝土耐久性退化分析模型,以及钢筋与再生混凝土间粘结性能退化分析模型,初步实现了基于腐蚀环境因素和再生混凝土材料因素的再生混凝土损伤预测问题。同时,基于结构时变可靠度理论,建立了硫酸钠环境作用下,考虑再生混凝土强度、再生混凝土与钢筋粘结性能以及几何参数变化的钢筋再生混凝土梁受弯承载力时变可靠度分析模型。论文研究结论可对再生混凝土在道路工程、桥梁工程、住宅建筑工程等工程的应用,以及工程可靠性评估提供有益的参考。
Compared with conventional reinforced concrete structure, recycle aggregate concrete (RAC) structure has the potential huge advantage on saving natural building stones resources, protecting environment and good economy because of effective usage of the waste concrete material in RAC structure. The degradation of material properties of RAC and steel bar exposed to corrosive environment will certainly lead to gradual decline in resistance and reliability of RAC structure. From the domestic and overseas research literatures nowadays, the relative research on durability of RAC structure has been rarely reported. So, the study on durability of RAC structure has a vital realistic and engineering significance for us.
     In order to investigate the damage evolution process and laws of RAC structure, the experiment was performed. The focus was the RAC durability and bond durability between RAC and steel bar in sulfate or freeze-thaw cycles corrosive environment. Considering the factors of corrosion condition and RAC material, the durability decay models were established by the application of damage theory and attenuation function, which is effective to achieve the initial the goal of damage prediction of RAC structure. Meanwhile, based on the time-variant reliability theory and the testing results, the time-variant reliability model of bending capacity of RAC beam was established, considering the changes of RAC strength, bond performance and geometric parameter. This conclusion can provide some effective references for the application and reliability assessment of RAC structure in road, bridge, tunnel and housing construction.
引文
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