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水泥沥青砂浆是一种多相多孔的复合材料,其组分为水泥-沥青共同形成的复合胶凝体。为了解水泥沥青砂浆中的孔隙结构,应用低温氮吸附法分析了不同水泥-沥青质量比的水泥-沥青复合硬化体中BET比表面积、2～200nm孔分布随龄期的变化。测试结果显示:水泥-沥青复合硬化体的BET比表面积显著低于硅酸盐水泥石,随龄期增长而增大;在氮吸附法有效的孔径分析范围内(2～200nm),随龄期的增长,孔径50nm以下的孔数量增长显著,28d龄期CAB浆体的微分孔径分布曲线在5～7nm及20～50nm出现的分布峰,可分别归结于水化产物数量的增长及水化产物的填充作用;沥青含量对孔分布及孔结构形成有显著影响,随沥青含量的增大,复合硬化体的BET比表面积降低,小于50nm的孔数量减少。
Cement asphalt mortar is a multi-phase porous composite material, the composition of cement - asphalt co-formed composite gel. In order to understand the pore structure of cement asphalt mortar, the BET specific surface area and the pore distribution of 2 ~ 200nm in cement-asphalt composite hardened with different cement-asphalt mass ratios were analyzed by using low-temperature nitrogen adsorption method. The results show that the BET specific surface area of cement-asphalt composite hardened body is significantly lower than that of Portland cement, and increases with the age. In the range of effective pore size analysis (2 ~ 200nm) by nitrogen adsorption method, , The number of pores with diameters below 50 nm increased significantly. The distribution peaks of differential pore size distribution curves of 28-day-old CAB slurries at 5 ~ 7 nm and 20 ~ 50 nm can be attributed respectively to the increase of hydration products and hydration products The content of bitumen has a significant effect on pore distribution and pore structure formation. With the increase of bitumen content, the BET specific surface area of composite hardened body decreases and the number of pores less than 50nm decreases.