华南理工大学学报(自然科学版) ›› 2017, Vol. 45 ›› Issue (9): 102-109.doi: 10.3969/j.issn.1000-565X.2017.09.015

• 材料科学与技术 • 上一篇    下一篇

活性氧化镁补偿无机聚合物浆体收缩的作用机制

杨永民1,2,3 李兆恒1,2,3 张同生1 殷素红1†韦江雄1 陈晓文2 余其俊1   

  1. 1. 华南理工大学 材料科学与工程学院,广东 广州 510640; 2. 广东省水利水电科学研究院,广东 广州 510635;3. 广东省水利新材料与结构工程技术研究中心,广东 广州 510635
  • 收稿日期:2016-11-24 修回日期:2016-12-20 出版日期:2017-09-25 发布日期:2017-08-30
  • 通信作者: 殷素红( 1971-) ,女,教授,博士生导师,主要从事碱激发材料和低品位天然资源与工业废渣的高效利用等的研究. E-mail:imshyin@scut.edu.cn
  • 作者简介:杨永民( 1981-) ,男,博士生,主要从事水工建筑材料、水生态与水环境修复材料研究. E-mail: 381982967@ qq. com
  • 基金资助:
    国家自然科学基金国际( 地区) 合作与交流项目( 51561135012) ; “十三五”国家重点研发计划项目 ( 2016YFB0303502) ; 中国博士后科学基金资助项目( 2016M590776) ; 广东省水利科技创新项目( 2015-10)

Reaction Mechanism of Compensating Shrinkage of Inorganic Polymer Pastes by Using Reactive MgO

YANG Yong-min1,2,3 LI Zhao-heng1,2,3 ZHANG Tong-sheng1 YIN Su-hong1 WEI Jiang-xiong1 CHEN Xiao-wen2 YU Qi-jun1   

  1. 1.School of Materials Science and Engineering,South China University of Technology,Guangzhou 510640,Guangdong,China; 2.Guangdong Research Institute of Water Resources and Hydropower,Guangzhou 510635,Guangdong,China; 3.Guangdong Technical Research Center of Hydraulic New Materials and Structural Engineering,Guangzhou 510635,Guangdong,China
  • Received:2016-11-24 Revised:2016-12-20 Online:2017-09-25 Published:2017-08-30
  • Contact: 殷素红( 1971-) ,女,教授,博士生导师,主要从事碱激发材料和低品位天然资源与工业废渣的高效利用等的研究. E-mail:imshyin@scut.edu.cn
  • About author:杨永民( 1981-) ,男,博士生,主要从事水工建筑材料、水生态与水环境修复材料研究. E-mail: 381982967@ qq. com
  • Supported by:
    Supported by the National Natural Science Fundation of International ( Regional) Cooperation and Exchange Program ( 51561135012 ) ,the National Program on Key Research Project of China During the “13th Five-Year Plan” ( 2016YFB0303502) and the China Postdoctoral Science Fundation( 2016M590776)

摘要: 将活性氧化镁均匀分散于无机聚合物浆体中,以期快速、均匀补偿收缩. 研究了掺活性氧化镁的无机聚合物浆体的形变、力学性能、结构与组成. 结果表明: 活性氧化镁掺量为6%时,无机聚合物浆体的28 d 化学收缩降低10. 7%,7 d 自收缩降低72. 1%,28 d 干燥收缩降低20. 0%,有效补偿了无机聚合物硬化过程中的体积收缩. 颗粒细小的活性氧化镁在高碱度液相环境中与水反应生成晶体细小的蠕虫状Mg( OH)2,在无机聚合物浆体中产生均匀微膨胀,细化了浆体孔径,并提高了无机聚合物的强度,实现了无机聚合物浆体收缩和氧化镁补偿收缩历程的匹配.

关键词: 活性氧化镁, 无机聚合物, 收缩, 膨胀

Abstract: In order to compensate the shrinkage of inorganic polymer pastes uniformly and quickly,reactive MgO powders were evenly dispersed in the inorganic polymer pastes,and the deformation,mechanical property,microstructure and component of the inorganic polymer pastes doped with the reactive MgO were investigated.The results indicate that,when the dosage of the reactive MgO is 6%,the chemical shrinkage,autogenous shrinkage and drying shrinkage of the inorganic polymer pastes decrease respectively by 10. 7% at 28d,72. 1% at 7d and 20. 0% at 28 d,which means that the shrinkage of the inorganic polymer pastes in a hardening process is effectively compensated by the reactive MgO,In addition,after the reaction of the reactive MgO with the water in a high-alkalinity liquid-phase environment,fine wormlike Mg( OH) 2 crystal forms and causes a uniform expansion in the inorganic polymer pastes,which refines the pore size of the inorganic polymer pastes and enhances their compressive strength,so that the compensation of the reactive MgO for the shrinkage of the inorganic polymer pastes is accomplished.

Key words: reactive MgO, inorganic polymers, shrinkage, expansion

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