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中文摘要：
将多重全内反射傅里叶变换红外光谱（FTIR-MIR）技术应用于混凝土渗透性研究。考察了水灰比和养护龄期与混凝土微孔结构之间的关系及其对混凝土渗透性的影响。简要分析了水和硫酸根离子在混凝土中传输规律。原位FTIR-MIR研究表明,水在混凝土中的传输主要依靠混凝土内部孔隙两端的毛细势能梯度。SO42-离子的传输过程则要考虑对流和浓度差引起的扩散两种方式以及SO42-与混凝土中水化产物的反应。混凝土抗渗性能与其微观孔结构有着密切的关系,随着水灰比降低或养护龄期延长,混凝土孔隙率减小,孔的连通性下降,混凝土抗渗性能提高。
英文摘要：
Fourier transform infrared spectroscopy with multiple internal reflection mode（FTIR-MIR） has been applied for the first time to measure the permeability of concrete.The effect of water-cement ratio and curing time on the microstructure and permeability of concrete was studied.Also,the penetration process of H2O and SO2-4 through the concrete specimens was investigated.The results indicated that the movement of H2O through unsaturated concrete was mainly caused by capillary suction and the movement of SO2-4 through unsaturated concrete should take into account diffusion,advection caused by a capillary suction flow and the reaction between SO2-4 and the cement hydration products.The permeability of concrete was determined by its microstructure.With the decrease in water-cement ratio and the increase in curing time,the porosity and the connectivity of pores in concrete decreased,which resulted in the decrease of concrete permeability.
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