[1]Yao Zhenya,Zheng Juanrong,Liu Lina.Experimental study of chemical shrinkage or expansion of alkali-inspired cementitious materials[J].Journal of Zhengzhou University (Engineering Science),2008,29(04):69-72.[doi:10.3969/j.issn.1671-6833.2008.04.017]
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Journal of Zhengzhou University (Engineering Science)[ISSN
1671-6833/CN
41-1339/T] Volume:
29卷
Number of periods:
2008年04期
Page number:
69-72
Column:
Public date:
1900-01-01
- Title:
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Experimental study of chemical shrinkage or expansion of alkali-inspired cementitious materials
- Author(s):
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Yao Zhenya; Zheng Juanrong; Liu Lina
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- Keywords:
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- CLC:
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- DOI:
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10.3969/j.issn.1671-6833.2008.04.017
- Abstract:
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The chemical shrinkage or expansion of alkali-jerked cementitious material and water-cement system was experimentally studied, and the water-cement system was used as a contrast sample. The results showed that chemical shrinkage occurred in the water-cement system, alkali-excited slag and alkali-excited fly ash system at room temperature (20±1)°C, and the shrinkage value increased with the extension of reaction age. The chemical shrinkage of the water-cement system is greatest at the same age. The chemical shrinkage of alkali-excited slag systems is minimal; Chemical expansion occurred in alkali-inspired metakaolin system, and its expansion value increased with the extension of reaction age. The reaction product of alkali excitation metakaolin is amorphous zeolites (because of the NH4+ ion exchange properties of zeolite), in which the products with low polymerization degree contribute greatly to chemical expansion; The properties of the main reaction products of alkali-excited slag system and alkali-excited fly ash system are similar to those of cement products, but there is a small amount of amorphous zeolite, which partially counteracts chemical shrinkage.