Effect of Light-burned Magnesium Oxide on Deformation Behavior of Geopolymer and its Mechanism
For the exploration of a way to compensate the shrinkage of geopolymer, the deformation behavior of geopolymer bars with different contents of MgO was investigated via curing under different conditions (i.e., room temperature and 38 at relative humidity (RH) of > 95%). The composition
of the geopolymer was characterized by X-ray diffraction and thermogravimetry. The mechanism of MgO on affecting the deformation behaviour of geopolymer was proposed. The results show that the addition of MgO has an influence on the deformation behavior of geopolymer, and this effect is various
with curing conditions. The addition of MgO decreases the shrinkage of geopolymer. The more MgO added, the less shrinkage would be. However, the effect of MgO in shrinkage compensation in geopolymer is not as significant as that in OPC system. MgO is involved in reactions in geopolymer based
on different mechanisms. MgO could bond with free [SiO4]4- to form magnesium silicate gel at a normal temperature, resulting in a high water absorption capacity. The increase of the curing temperature promotes the geopolymerization, and the reduction of the availability
of free [SiO4]4- suppresses the formation of magnesium silicate gel.
Keywords: deformation behavior; geopolymer; magnesium oxide; shrinkage compensation
Document Type: Research Article
Affiliations: College of Materials Science and Engineering, Nanjing University of Technology, Nanjing 210009, China
Publication date: 01 November 2012
- Journal of the Chinese Ceramic Society (JCCS), published in Chinese and in English, is a comprehensive monthly periodical focused on the fields of inorganic and non-metallic materials. The main purpose of the JCCS is to report the latest creative achievements in research, production and design for ceramics, glass, cementing materials, refractory, artificial crystals and other non-metallic materials. JCCS is regarded as an important journal in inorganic and non-metallic materials sciences in China and has been awarded by China Association for Science and Technology. The full-text of papers in JCCS is also published by CNKI (China National Knowledge Infrastructure). JCCS is indexed in EI Compendex, CA( Chemical Abstracts) ,SA and Ж and more than 20 databases.
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