Journal of South China University of Technology (Natural Science Edition) ›› 2017, Vol. 45 ›› Issue (9): 102-109.doi: 10.3969/j.issn.1000-565X.2017.09.015

• Materials Science & Technology • Previous Articles     Next Articles

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)

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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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