Impacts of Space Restriction on the Microstructure of Calcium Silicate Hydrate

Materials

Zheyu Zhu¹  Yue Zhou¹  Zhongping Wang¹  Linglin Xu¹  Yuting Chen¹  Kai Wu¹ 

[1] School of Materials Science and Engineering, Tongji University, 4800 Cao’an Road, Shanghai 201804, China;

关键词: calcium silicate hydrate (C-S-H);    space restriction;    cement;    hydration;   

DOI  :  10.3390/ma14133645

来源: DOAJ

【 摘 要 】

The effect of hydration space on cement hydration is essential. After a few days, space restriction affects the hydration kinetics which dominate the expansion, shrinkage and creep of cement materials. The influence of space restriction on the hydration products of tricalcium silicate was studied in this paper. The microstructure, morphology and composition of calcium silicate hydrate (C-S-H) were explored from the perspective of a specific single micropore. A combination of Raman spectra, Fourier transform infrared spectra, scanning electron microscopy and energy dispersive X-ray spectroscopy were employed. The results show that space restriction affects the structure of the hydration products. The C-S-H formed in the micropores was mainly composed of Q³ silicate tetrahedra with a high degree of polymerization. The C-S-H formed under standard conditions with a water to cement ratio of 0.5 mostly existed as Q² units. Space restriction during hydration is conducive to the formation of C-S-H with silica tetrahedra of a high polymerization degree, while the amount of water filling the micropore plays no obvious role on the polymeric structure of C-S-H during hydration.

【 授权许可】

Unknown