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为了探讨混凝土获得良好的表层抗氯离子渗透性对早期湿养护时间的需求,设置了4种不同的养护方法,将一直湿养护条件下的混凝土表层氯离子扩散系数与抗压强度进行关联,研究了养护方法对不同强度等级的混凝土表层氯离子渗透性的影响规律。研究结果显示:混凝土的表层氯离子渗透性比抗压强度和本体氯离子渗透性对湿养护时间的敏感性更高,缩短湿养护时间会明显降低混凝土的表层抗氯离子渗透性;高强混凝土的表层氯离子渗透性对湿养护时间长短的敏感性比中等强度等级和低强度等级混凝土的表层氯离子渗透性略低;为使混凝土获得良好的表层抗氯离子渗透性,需保证混凝土有足够的(14d以上)湿养护时间。
In order to find out the demand of early wet curing time for concrete to obtain good surface resistance to chloride ion penetration, four different curing methods were set up to correlate the chloride ion diffusion coefficient and compressive strength of concrete surface under wet curing condition. Effect of Conservation Methods on Chloride Ion Permeability of Concrete Surfaces with Different Intensity Levels. The results show that the chloride ion permeability of concrete is higher than that of compressive strength and bulk chloride ion permeability for wet curing time. Shortening the wet curing time will obviously reduce the resistance of concrete to chloride ion penetration. The sensitivity of surface chloride ion permeability to wet curing time is slightly lower than the surface chloride ion permeability of concrete with medium-strength and low-strength grades; in order to obtain good surface chloride resistance of concrete, it is necessary to ensure that concrete has enough (14d above) wet curing time.