稻壳灰混凝土的氯离子扩散系数

N. Maeda, I. Wada, M. Kawakami, T. Ueda, G. Pushpalal
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引用次数: 9

摘要

研究了稻壳灰掺量对混凝土氯离子扩散系数的影响。混凝土标本,water-cementitious材料比率为0.30,0.36和0.53,有或没有稻壳灰受到加速氯离子渗透使用以下两种方法:1)浸泡在饱和氯化钠在20摄氏度,ii)接触交替周期3天浸泡在3%的氯化钠溶液在20摄氏度,4天干燥在50%相对湿度加速氯离子渗透后,混凝土的总氯含量的标本在不同深度决定。因此,利用氯化物含量分布,应用菲克第二定律计算混凝土的氯化物扩散系数。此外,还测定了混凝土的孔径分布,以评价混凝土微观结构对氯离子扩散系数的影响。从试验结果来看,掺入稻壳灰的混凝土经加速氯离子渗透后,总氯离子含量低于对照混凝土。掺稻壳灰混凝土的氯离子扩散系数比对照混凝土低57% ~ 25%。观察了稻壳灰对混凝土孔隙细化的影响,特别是对孔隙半径大于50nm的混凝土。稻壳灰掺入后,混凝土的孔径分布有向小孔方向移动的趋势。掺入RHA的混凝土氯离子扩散系数的降低可能是由于其孔隙细化效应。
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Chloride Diffusivity of Concrete Incorporating Rice Husk Ash
Effect of rice husk ash addition on the chloride diffusivity of concrete is investigated in the present paper. The concrete specimens, having water-cementitious materials ratio of 0.30, 0.36 and 0.53, with and without rice husk ash are subjected to accelerated chloride penetration using the following two methods: i) Immersion in saturated NaCl at 20 degrees C, ii) Exposure to alternate cycles of 3 days immersion in 3% NaCl solution at 20 degrees C and 4 days drying at 50% R.H. After the accelerated chloride penetration, the total chloride content of concrete specimens at various depths was determined. Consequently, using the chloride content distributions, the chloride diffusion coefficient of concrete is evaluated by applying Fick's second law. In addition, the pore size distribution of concrete is determined in order to assess the effect of concrete microstructure on chloride diffusivity. From the experimental results, the total chloride content of concrete incorporating rice husk ash was shown to be lower than that of the control concrete after accelerated chloride penetration. The concrete specimens incorporating rice husk ash had chloride diffusion coefficients 57% to 25% lower than the control concrete. The effect of rice husk ash on pore refinement in concrete was observed, especially in the pore radii larger than 50nm. The pore size distribution of concrete tended to shift towards the smaller pores with the addition of rice husk ash. The decrease of the chloride diffusion coefficient of concrete incorporating RHA may therefore be attributed to the pore-refinement effect.
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