Journal of South China University of Technology(Natural Science Edition) ›› 2007, Vol. 35 ›› Issue (8): 103-108.

• Materials Science & Technology • Previous Articles     Next Articles

Contrastive Investigation into Activated Effects of Two Alkali-Activators on Geopolymers

Guo Wen-ying1  Wen Zi-yun2  Yin Su-hong2  Wu Guo-lin3   

  1. 1. School of Traffic and Communications , South China Univ. of Tech. , Guangzhou 510640 , Guangdong , China;2. School of Materials Science and Engineering , South China Univ. of Tech. , Guangzhou 510640 , Guangdong , China;3. Guangzhou Municipal and Garden Quality Testing Center , Guangzhou 510050 , Guangdong , China
  • Received:2006-11-23 Online:2007-08-25 Published:2007-08-25
  • Contact: 郭文瑛(1977-) ，女，博士后，主要从事建筑材料研究。 E-mail:wyguo@scut. edu.cn
  • About author:郭文瑛(1977-) ，女，博士后，主要从事建筑材料研究。
  • Supported by:

    广州市科技攻关引导项目(2004-D038 )

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Abstract:

The activated effects of two kinds of alkali-activators , namely , sodium hydroxide solution and sodium silicate solution , on metakaolinite were investigated using the large solid-liquid ratio method. In the investigation , the slurry was separated after a period of activation , and the separated solutions and powders were then analyzed , respectively. It is found that (1) in the separated solution after the reaction between sodium silicate solution and metakaolin , the polymerization degree of Si increases with the reaction time , the soluble Al polymerizes with the siliceous ion , and the separated powder contains both the fragment of metakaolinite and the gel of silicate-aluminium;( 2) in the separated solution after the reaction between sodium hydroxide solution and metakaolin , the contents of Si and Al increase with the reaction time , the soluble Al does not polymerize with the siliceous ion , and the separated powder only contains the fragment of metakaolinite; and (3) the siliceous ion in sodium silicate solution plays a significant role in the geopolymeric reaction.

Key words: geopolymer, alkali -activator, activated effect, erosion, polymerization