河套灌区渠道衬砌混凝土的纳米颗粒改性研究
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摘要
为了改善河套灌区大量渠道衬砌工程中混凝土的干缩变形性能,采用纳米二氧化硅(NS)和纳米碳化硅(NC)掺入粉煤灰水泥砂浆制备混凝土试样,并对其作用机理进行理论分析。结果表明,纳米颗粒在提高粉煤灰混凝土抗压和抗弯强度得同时也改善了干缩性能;与普通水泥砂浆相比,单掺2%NS和单掺2%NC的水泥砂浆干燥收缩率分别提高了约90%和120%;改性干缩率在早期增加明显,单掺与双掺对混凝土的干缩率影响差异不大;纳米颗粒的表面效应和微观骨料填充效应,增大了骨料得表面能且填充了内部孔隙,是干缩性能有明显提高的原因。研究结果对设计高强度和高干缩性的衬砌混凝土,提高河套灌区渠道使用寿命具有一定指导意义。
In order to improve the dry shrinkage deformation performance of concrete in a large number of canal lining works in Hetao irrigation area,two types of nano-particles,including nano-silica( NS) and nano-silicon carbide( NC),were used to prepare concrete specimens. On the basis of strength tests,the effect of nano-particle content on the drying shrinkage performance of different specimens was studied,and the mechanism was analyzed theoretically. The results show that nano-particles can improve both the compressive and bending strength of fly ash concrete,so as the drying shrinkage performance. The optimum adding quantity of NS and NC is 2% and 2% with the drying shrinkage rate of drying enhanced by 90% and 120% respectively. The dry shrinkage rate is significantly increased in the early stages,and the effect of single and double mixing on the dry shrinkage of concrete are not very different. The surface energy of aggregate is increased and the micro-structure pore is filled,so the drying shrinkage performance of fly ash concrete is improved based on the surface effect of nano-particles and micro-aggregate filling effect. The research results have certain guiding significance for designing high strength and drying shrinkage performance of concrete in Hetao irrigation area.
In order to improve the dry shrinkage deformation performance of concrete in a large number of canal lining works in Hetao irrigation area,two types of nano-particles,including nano-silica( NS) and nano-silicon carbide( NC),were used to prepare concrete specimens. On the basis of strength tests,the effect of nano-particle content on the drying shrinkage performance of different specimens was studied,and the mechanism was analyzed theoretically. The results show that nano-particles can improve both the compressive and bending strength of fly ash concrete,so as the drying shrinkage performance. The optimum adding quantity of NS and NC is 2% and 2% with the drying shrinkage rate of drying enhanced by 90% and 120% respectively. The dry shrinkage rate is significantly increased in the early stages,and the effect of single and double mixing on the dry shrinkage of concrete are not very different. The surface energy of aggregate is increased and the micro-structure pore is filled,so the drying shrinkage performance of fly ash concrete is improved based on the surface effect of nano-particles and micro-aggregate filling effect. The research results have certain guiding significance for designing high strength and drying shrinkage performance of concrete in Hetao irrigation area.
引文
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[3]郑慧慧.聚丙烯纤维混凝土衬砌堤坝应用数值模拟[J].节水灌溉,2018(7):65-70.
[4]田振华,李宝石,王经臣.水工隧洞混凝土衬砌裂缝监测与成因分析[J].水力发电,2017,43(9):45-48.
[5]郝蓓蓓,龚爱民,彭玉林,等.硅粉掺量对钢纤维硅粉混凝土力学性能的影响[J].水电能源科学,2016,34(9):144-147.
[6]阎培渝,余成行,王强,等.高强自密实混凝土的减缩措施[J].硅酸盐学报,2015,43(4):363-367.
[7]郝蓓蓓,龚爱民,彭玉林,等.硅粉掺量对钢纤维硅粉混凝土力学性能的影响[J].水电能源科学,2016,34(9):144-147.
[8]高翔.纳米SiO2改性超高韧性水泥基复合材料试验研究[D].杭州:浙江大学,2016.
[9]宁逢伟,丁建彤,陈波,等.纳米级掺合料粗合成纤维湿喷混凝土施工及抗裂性能分析[J].水电能源科学,2017,35(2):123-126.
[10]王大伟,袁维华,王潘绣,等.陶粒形态对超轻淤泥陶粒混凝土强度影响[J].工业安全与环保,2017,43(6):98-100.
[11]霍建梅,丁强.纳米材料对橡胶再生混凝土干湿腐蚀循环性能的影响[J].混凝土与水泥制品,2016(5):27-31.
[12]范玉辉,牛海成,张向冈.纳米SiO2改性再生混凝土试验研究[J].混凝土,2017(7):92-95.
[13]秦子鹏,田艳,李刚,等.水工泵送及常态混凝土性能对比试验研究[J].长江科学院院报,2017,34(3):139-142,147.
[14]郑慧慧.聚丙烯纤维混凝土衬砌堤坝应用数值模拟[J].节水灌溉,2018(7):65-70.
[15]许耀群,李曙光,王娟,等.纳米材料对混凝土耐久性和功能性影响研究[J].水利水电技术,2017,48(9):208-215.
[16]王德志,孟云芳,李田雨.纳米Si O2和纳米CaCO3改善混凝土抗冻性能试验[J].混凝土与水泥制品,2015(7):6-10.