高温作用下活性粉末混凝土的孔结构研究
|
摘要
为探究活性粉末混凝土孔结构与强度的关系,本文研究了配合比参数对RPC抗压强度的影响,同时,使用X-CT、压汞法和氮气吸附法测试了热水养护与高温养护下RPC的孔结构.试验结果表明,通过优选组分配制出了在热水养护下抗压强度为205.3 MPa和在200℃高温养护下抗压强度达271.6 MPa的RPC;高温养护样品在介孔范围内的孔数远大于热水养护的样品,而微米孔径上的孔体积始终小于热水养护样品,高温养护能有效细化孔径和提高RPC的抗压强度,结合运用3种测试方法能够更详细地描述RPC从介孔到大孔的孔径分布情况.
In the report, in order to investigate the relationship between the pore structure and strength of reactive powder concrete, the effects of proportion parameters on the compressive strength of RPC were studied. X-CT technique, mercury intrusion porosimetry and nitrogen adsorption method were used to determine the hot water curing and high temperature curing RPC holes. The results showed that the RPC with a compressive strength of 205.3 MPa under hot water curing and a compressive strength of 271.6 MPa under high temperature curing at 200°C are prepared by the preferred components; the number of pores in the mesoporous range of the high temperature curing sample is much more than that of the hot water curing sample, and the pore volume on the micro pore size is always smaller than that of the hot water curing sample, and the high temperature curing can effectively refine the pore diameter, thereby increasing the RPC compressive strength. Combined with three test methods, the pore size distribution of RPC from mesopores to macropores can be described in more detail.
In the report, in order to investigate the relationship between the pore structure and strength of reactive powder concrete, the effects of proportion parameters on the compressive strength of RPC were studied. X-CT technique, mercury intrusion porosimetry and nitrogen adsorption method were used to determine the hot water curing and high temperature curing RPC holes. The results showed that the RPC with a compressive strength of 205.3 MPa under hot water curing and a compressive strength of 271.6 MPa under high temperature curing at 200°C are prepared by the preferred components; the number of pores in the mesoporous range of the high temperature curing sample is much more than that of the hot water curing sample, and the pore volume on the micro pore size is always smaller than that of the hot water curing sample, and the high temperature curing can effectively refine the pore diameter, thereby increasing the RPC compressive strength. Combined with three test methods, the pore size distribution of RPC from mesopores to macropores can be described in more detail.
引文
[1] Richard P ,Cheyrezy M .Composition of reactive powder concretes[J].Cement & Concretce Research,1995,25(7):1501-1511.
[2] 覃维祖,曹峰.一种超高性能混凝土——活性粉末混凝土[J].工业建筑,1999(4):18-20.
[3] 金南国,金贤玉,郭剑飞.混凝土孔结构与强度关系模型研究[J].浙江大学学报(工学版),2005(11):1680-1684.
[4] 龙广成,谢友均,王培铭,等.活性粉末混凝土的性能与微细观结构[J].硅酸盐学报,2005(4):456-461.
[5] 蒲心诚,王勇威.超高强高性能混凝土的孔结构与界面结构研究[J].混凝土与水泥制品,2004(3):9-13.
[6] Shi C ,Wang D ,Wu L ,et al.The hydration and microstructure of ultra high-strength concrete with cement-silica fume-slag binder[J].Cement and Concrete Composites,2015,61:44-52.
[7] Masdar Helmi,Matthew R Hall,Lee A Stevens,et al.Effects of high-pressure/temperature curing on reactive powder concrete microstructure formation[J].Construction and Building Materials,2016,105:554-562.
[8] Diamond S .Mercury porosimetry—An inappropriate method for the measurement of pore size distributions in cement-based materials[J].Cement and Concrete Research,2000,30(10):1517-1525.
[9] 韩建德,潘钢华,孙伟.基于三维XCT对碳化引起水泥砂浆内部缺陷改变的测试和分析(英文)[J].硅酸盐学报,2011,39(1):75-79.
[10] Promentilla M B A,Sugiyama T.X-ray microtomography of mortars exposed to freezing-thawing action[J].J.Adv.Concr.Technol,2010,8(2):97–111.
[11] Lu S ,Landis E N ,Keane D T .X-ray microtomographic studies of pore structure and permeability in Portland cement concrete[J].Materials & Structures,2006,39(6):611-620.
[12] 中华人民共和国建设部,GB/T 17671—1999,水泥胶砂强度检验方法(ISO法)[S].北京:中国标准出版社,1999.
[13] 何峰,黄政宇.硅灰和石英粉对活性粉末混凝土抗压强度贡献的分析[J].混凝土,2006(1):39-42.
[14] Lin Jian,Zhang Nannan,Zhang Qiyuan,et al.Research on Mechanical Properties and Pore Structure of Reactive Powder Concrete[C].第二届超高性能混凝土材料与结构国际会议论文摘要集.2018:11.
[15] 吴中伟,廉惠珍.高性能混凝土[M].北京:中国铁道出版社,1999.
[16] 鞠杨,刘红彬,田开培,等.RPC高温爆裂的微细观孔隙结构与蒸汽压变化机制的研究[J].中国科学:技术科学,2013,43(2):141-152.
[2] 覃维祖,曹峰.一种超高性能混凝土——活性粉末混凝土[J].工业建筑,1999(4):18-20.
[3] 金南国,金贤玉,郭剑飞.混凝土孔结构与强度关系模型研究[J].浙江大学学报(工学版),2005(11):1680-1684.
[4] 龙广成,谢友均,王培铭,等.活性粉末混凝土的性能与微细观结构[J].硅酸盐学报,2005(4):456-461.
[5] 蒲心诚,王勇威.超高强高性能混凝土的孔结构与界面结构研究[J].混凝土与水泥制品,2004(3):9-13.
[6] Shi C ,Wang D ,Wu L ,et al.The hydration and microstructure of ultra high-strength concrete with cement-silica fume-slag binder[J].Cement and Concrete Composites,2015,61:44-52.
[7] Masdar Helmi,Matthew R Hall,Lee A Stevens,et al.Effects of high-pressure/temperature curing on reactive powder concrete microstructure formation[J].Construction and Building Materials,2016,105:554-562.
[8] Diamond S .Mercury porosimetry—An inappropriate method for the measurement of pore size distributions in cement-based materials[J].Cement and Concrete Research,2000,30(10):1517-1525.
[9] 韩建德,潘钢华,孙伟.基于三维XCT对碳化引起水泥砂浆内部缺陷改变的测试和分析(英文)[J].硅酸盐学报,2011,39(1):75-79.
[10] Promentilla M B A,Sugiyama T.X-ray microtomography of mortars exposed to freezing-thawing action[J].J.Adv.Concr.Technol,2010,8(2):97–111.
[11] Lu S ,Landis E N ,Keane D T .X-ray microtomographic studies of pore structure and permeability in Portland cement concrete[J].Materials & Structures,2006,39(6):611-620.
[12] 中华人民共和国建设部,GB/T 17671—1999,水泥胶砂强度检验方法(ISO法)[S].北京:中国标准出版社,1999.
[13] 何峰,黄政宇.硅灰和石英粉对活性粉末混凝土抗压强度贡献的分析[J].混凝土,2006(1):39-42.
[14] Lin Jian,Zhang Nannan,Zhang Qiyuan,et al.Research on Mechanical Properties and Pore Structure of Reactive Powder Concrete[C].第二届超高性能混凝土材料与结构国际会议论文摘要集.2018:11.
[15] 吴中伟,廉惠珍.高性能混凝土[M].北京:中国铁道出版社,1999.
[16] 鞠杨,刘红彬,田开培,等.RPC高温爆裂的微细观孔隙结构与蒸汽压变化机制的研究[J].中国科学:技术科学,2013,43(2):141-152.
© 2004-2018 中国地质图书馆版权所有 京ICP备05064691号 京公网安备11010802017129号 地址：北京市海淀区学院路29号 邮编：100083 电话：办公室：(+86 10)66554848；文献借阅、咨询服务、科技查新：66554700 |