【摘要】 为提高粉煤灰混凝土路面工作性能，使用纳米氧化硅对其进行改性。分别用纳米氧化硅质量分数为0、0.01%、0.02%和0.03%的试件进行测试，获得混凝土材料的力学性能、抗冻融性能、干缩性及耐磨性等指标。结果表明：经纳米氧化硅改性后的混凝土具有高强度、高抗冻性、高耐磨性及低干缩性、低渗透性等优良性能；纳米氧化硅颗粒可以降低混凝土的孔隙率，形成屏障阻止裂纹扩展，从而达到改善水泥基复合材料孔隙结构的目的。综合考虑性能提升与经济成本，采用粉煤灰质量分数为15%、纳米氧化硅质量分数为0.02%的材料作为路面混凝土的配比为宜。更多还原

【Abstract】 In order to improve the working performance, the fly ash pavement concrete was modified by nano silicon oxide. The mechanical properties, freeze-thaw resistance, dry shrinkage and wear resistance of concrete materials with nano-silica mass fraction of 0, 0.01%, 0.02 % and 0.03% were tested. The results showed that nano-silica modified concrete had high strength, high frost resistance, high wear resistance as well as low dry shrinkage and low permeability. Nano-silica particles could reduce the porosity of concrete and formed a barrier to prevent crack propagation, so as to improve the pore structure of cement-based composites. Considering the performance improvement and economic cost, it is suggested that concrete should be produced with the 15% mass fraction of fly ash and the 0.02% mass fraction of nano-silica.更多还原