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水泥混凝土的抗渗性是指混凝土抵抗外界H2O、Cl-、SO4-2等一切具有腐蚀性离子渗透的能力,是多孔性材料的基本性质之一。由于其既反映了混凝土内部孔隙的大小、数量与连通性情况,又表征了密实性,因此被认为是最重要的耐久性评价指标。国内外很多学者都以抗渗性作为混凝土耐久性研究的起点,其中氯离子抗渗性在近二十年来得到了最广泛的重视,本文首先对氯离子渗透对混凝土路面破坏机理分析,然后通过对不同外加材料、不同掺量下混凝土的力学性能进行分析,优选出外加材料的掺量范围,然后进行抗渗性试验研究,提出外加材料的最佳掺量。
Impermeability of concrete refers to the concrete resistance to the outside world H2O, Cl-, SO4-2 all corrosive ion penetration ability, is one of the basic properties of porous materials. It is considered to be the most important indicator of durability because it reflects both the size, the amount and the connectivity of the pores inside the concrete and the characterization of the compactness. Many scholars at home and abroad regard impermeability as the starting point of concrete durability research. Among them, chloride ion impermeability has received the most extensive attention in recent twenty years. In this paper, firstly, the mechanism of chloride ion penetration on concrete pavement failure is analyzed, The mechanical properties of concrete with different added materials and different dosage were analyzed, and the range of the added materials was optimized. Then the impermeability test was conducted and the best dosage of the added materials was put forward.