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采用综合测试手段，对香港粉煤灰的理化特性、粒度分布、表面结构进行了较为系统的研究．结果表明：该粉煤灰以铝硅玻璃体（高铝）为主，其晶相为莫来石和少量石英，含碳量较低，平均粒度为１１．６μｍ，明显小于香港水泥颗粒的平均粒度１９．６μｍ．Ｎ２吸附比表面积测定表明：香港粉煤灰具有较大的比表面积，约为水泥的２．３倍．表面结构以球形为主且大部分球体具有明显的气孔与内部空腔相连，从而导致了较强的离子吸附效应．１ａ的对比实验表明：在混凝土中掺入质量分数为２５％的粉煤灰不但能显著降低Ｃｌ－渗透系数，而且也减少了ＳＯ２－４引起的破坏，因而可大幅度延长沿岸混凝土工程的使用寿命．
Using comprehensive testing methods, the physical and chemical characteristics, particle size distribution and surface structure of Hong Kong fly ash were systematically studied. The results show that the fly ash is mainly composed of Al-Si glass body (high aluminum), its crystal phase is mullite and a small amount of quartz, and the carbon content is relatively low. The average particle size is 11.6 μm, which is obviously smaller than the average grain size of cement particles in Hong Kong. 19 .6μm. N2 adsorption specific surface area measurement shows that: Hong Kong fly ash has a larger specific surface area, about 2.3 times that of cement. The surface structure is mainly spherical and most of the spheres have obvious pores connected with the internal cavity, which leads to a strong ion adsorption effect. The comparative experiment of 1a shows that the incorporation of fly ash with a mass fraction of 25% in concrete not only can significantly reduce the Cl-permeability coefficient, but also reduce the damage caused by SO2-4, thus greatly prolonging the use of coastal concrete works. life.