Effect of Nano-Silica Agglomeration on Hydration and Hardening of Cement
Effect of nano-silica agglomeration on the hydration and hardening of cement was investigated by using precipitated silica (PS) with much larger agglomerates and nano-silica (NS) powder with much smaller ones as additives. The results reveal that the PS exhibits a higher pozzolanic
reactivity at early ages and a better accelerating effect on the cement hydration though it possesses some larger agglomerates and a little lower pozzolanic reactivity at late ages rather than NS. The observation by scanning electron microscopy indicates that the cementitious property of the
pozzolanic C–S–H gels from the agglomerates was limited. There even existed an interfacial transition zone between the reacted agglomerates and bulk hardened cement paste (HCP). The MIP results show that the NS addition can reduce the capillary and the gel pore of the HCP in the
range of 20 nm–10 μm more effectively, compared to the PS addition. It is suggested that the effect of nano-silica addition on the microstructure improvement of the HCP could be resulted from the filling and water adsorbing effects of the agglomerates in the powder rather than the
seeding effect.
Keywords: agglomeration; cement hydration; microstructure; nano-silica
Document Type: Research Article
Affiliations: College of Civil Engineering & Architecture, Zhejiang University of Technology, Hangzhou 310014, 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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