纳米氧化硅对粉煤灰混凝土路面工作性能的影响  

Effect of Nano-silica on Working Performance of Fly Ash Pavement Concrete

作　　者：宋宝峰[1] 王保权[1] 李和玉[2] 张淑芬[1] SONG Bao-feng;WANG Bao-quan;LI He-yu;ZHANG Shu-fen(College of Urban Construction,Eastern Liaoning University,Dandong 118003,China;College of Urban Construction,Heilongjiang Forestry Vocational and Technical College,Mudanjiang 157011,China)

机构地区：[1]辽东学院城市建设学院,辽宁丹东118003 [2]黑龙江林业职业技术学院城市建设学院,黑龙江牡丹江157011

出　　处：《辽东学院学报（自然科学版）》2022年第4期293-299,共7页Journal of Eastern Liaoning University:Natural Science Edition

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。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.

关 键 词：粉煤灰混凝土 路面性能 纳米氧化硅 微观形态 

分 类 号：TU528.572[建筑科学—建筑技术科学]