氧化镁膨胀剂对UHPC浆体早期孔结构演变的影响

硅酸盐通报 ›› 2023, Vol. 42 ›› Issue (3): 871-877.

所属专题：水泥混凝土

氧化镁膨胀剂对UHPC浆体早期孔结构演变的影响

张占强¹, 陈平^2,3,4, 李顺凯^2,3,4, 明阳^2,3,4, 刘荣进^1,3,4, 李航¹, 赵欢²

1.桂林理工大学材料科学与工程学院,桂林 541004;
2.桂林理工大学土木与建筑工程学院,桂林 541004;
3.广西建筑新能源与节能重点实验室,桂林 541004;
4.有色金属矿产勘查与资源高效利用省部共建协同创新中心,桂林 541004

收稿日期:2022-11-03 修订日期:2022-12-08 出版日期:2023-03-15 发布日期:2023-03-31
通信作者: 李顺凯,教授。E-mail:lishunkai7910@163.com
作者简介:张占强(1989—),男,硕士研究生。主要从事超高性能混凝土的制备及耐久性研究。E-mail:Zhengxin@glut.edu.cn
基金资助:
广西重点研发计划(桂科 AB19259008)

Effect of MgO Expansive Agent on Early Pore Structure Evolution of UHPC Pastes

ZHANG Zhanqiang¹, CHEN Ping^2,3,4, LI Shunkai^2,3,4, MING Yang^2,3,4, LIU Rongjin^1,3,4, LI Hang¹, ZHAO Huan²

1. College of Materials Science and Engineering, Guilin University of Technology, Guilin 541004, China;
2. College of Civil and Architecture Engineering, Guilin University of Technology, Guilin 541004, China;
3. Guangxi Key Laboratory of New Energy and Building Energy Saving, Guilin 541004, China;
4. Collaborative Innovation Center for Exploration of Nonferrous Metal Deposits and Efficient Utilization of Resources in Guangxi, Guilin 541004, China

Received:2022-11-03 Revised:2022-12-08 Online:2023-03-15 Published:2023-03-31

摘要/Abstract

摘要： 氧化镁膨胀剂(MEA)是一种性能优异的外加剂,可以补偿大体积混凝土收缩。本文采用压汞法(MIP)测试了不同活性水平的MEA对超高性能混凝土(UHPC)浆体1～7 d龄期孔结构演变的影响,并借助SEM及EDS对孔结构演变机理进行了分析。结果表明:颗粒粒径较小的高活性MEA更有利于丰富UHPC的粒径分布,实现基体最紧密堆积;不同活性的MEA均会增加1 d龄期UHPC浆体的孔隙率,但3 d以后各龄期浆体的孔隙率随MEA的掺入而降低,活性越高降低越明显;高活性MEA更有利于细化UHPC浆体3～67 nm的孔径;使用孔隙率及孔结构评价UHPC自收缩应考虑不同龄期的影响;MEA活性越高,水化生成的Mg(OH)₂晶体更多,有助于减小孔隙率并优化孔径;使用内掺法会增加硅灰的相对含量,增强硅灰的种子效应和火山灰效应,降低UHPC基体的最终孔隙率。

关键词: 氧化镁膨胀剂, 超高性能混凝土, 孔结构, 自收缩, 收缩补偿

Abstract: MgO expansive agent (MEA) is an excellent admixture that can compensate for the shrinkage in bulk concrete. The effect of MEA with different activity levels on the pore structure evolution of ultra-high performance concrete (UHPC) paste from 1 d to 7 d was tested by mercury intrusion porosimetry (MIP), and the pore evolution mechanism was also analyzed with the aid of SEM and EDS. The results show that the highly active MEA with a smaller particle size is more conducive to widening the particle size distribution of UHPC and achieving the closest stacking of matrix. The porosity of UHPC paste increases with different activity of MEA at 1 d, but after 3 d, the porosity of UHPC paste at all curing ages decreases with the incorporation of MEA. The higher active the MEA is, the more significant the reduction is. The highly active MEA is more favorable to refining the pore size distribution of UHPC paste in range of 3～67 nm. The use of porosity and pore structure to evaluate the autogenous shrinkage of UHPC should take the effects of different curing ages into account. The higher the active MEA is, the more Mg(OH)₂ crystals are produced, which reduces the porosity and refines the pore size distribution. In addition, the relative content of silica fume increases by internal doping method, which contributes to the seeding effect and pozzolanic effect, reducing the final porosity of UHPC matrix.

Key words: MgO expansive agent, ultra-high performance concrete, pore structure, autogenous shrinkage, shrinkage compensation

中图分类号:

TU528

张占强, 陈平, 李顺凯, 明阳, 刘荣进, 李航, 赵欢. 氧化镁膨胀剂对UHPC浆体早期孔结构演变的影响[J]. 硅酸盐通报, 2023, 42(3): 871-877.

ZHANG Zhanqiang, CHEN Ping, LI Shunkai, MING Yang, LIU Rongjin, LI Hang, ZHAO Huan. Effect of MgO Expansive Agent on Early Pore Structure Evolution of UHPC Pastes[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(3): 871-877.

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氧化镁膨胀剂对UHPC浆体早期孔结构演变的影响

Effect of MgO Expansive Agent on Early Pore Structure Evolution of UHPC Pastes

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