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用自然扩散法测定混凝土中的总氯离子和自由氯离子浓度,计算不同种类混凝土对Cl-的结合能力,研究环境介质的种类及其氯离子浓度对混凝土氯离子结合能力的影响。结果表明,环境介质的成分越复杂、浓度越高、其他离子越多,普通混凝土对氯离子的结合能力越弱,掺矿物掺合料的混凝土与此规律基本相同。其中,以3.5%NaCl溶液为基准,普通混凝土、粉煤灰混凝土、硅灰混凝土、矿渣混凝土在(3.5%NaCl+5%MgSO4)溶液中的氯离子结合能力分别降低38%、36.7%、36%、51.7%,在青海盐湖卤水中则降低更多,分别达到58%、64.7%、74.9%、62.1%。因此,在成分复杂、浓度较高的氯盐环境中,应该考虑混凝土对氯离子结合能力的弱化作用。
The total chloride and free chlorine concentration in concrete were determined by natural diffusion method. The binding capacity of different types of concrete to Cl- was calculated. The influence of environmental medium and chloride ion concentration on the chloride ion binding capacity of concrete was studied. The results show that the more complex and the higher the concentration of the environmental medium, the more other ions, the weaker the binding capacity of ordinary concrete to chloride ions. The concrete with mineral admixture is basically the same with this law. Among them, the chloride ion binding capacity of ordinary concrete, fly ash concrete, silica fume concrete and slag concrete in (3.5% NaCl + 5% MgSO4) solution decreased by 38%, 36.7%, 36% % And 51.7%, respectively, but decreased more in Qinghai Salt Lake Brines, reaching 58%, 64.7%, 74.9% and 62.1% respectively. Therefore, in the composition of complex, high concentrations of chloride salt environment, we should consider the weakening of chloride binding capacity of concrete.