Well-Dispersed Silica Fume by Surface Modification and the Control of Cement Hydration

Author:

Ma Rui1,Guo Liping12ORCID,Sun Wei12,Rong Zhidan12ORCID

Affiliation:

1. School of Materials Science and Engineering, Southeast University, Nanjing 211189, China

2. Jiangsu Key Laboratory of Construction Materials, Advanced Civil Engineering Materials Collaborative Innovation Center, Nanjing 211189, China

Abstract

Silica fume (SF) is a valuable nanoscaled industrial by-product used in cementitious materials owing to its filling and pozzolanic effect. However, the heavy agglomeration of SF is a severe and common problem. In this study, surface modification with polyacrylic acid (PAA) was applied on SF to achieve a better dispersion and to optimize the hydration process of cement at early age. The particle size distribution and surface properties of SF, as well as the cement hydration with modified SF, were investigated. The results demonstrated that the agglomeration of SF particles was efficiently mitigated by the surface treatment with PAA, and the acceleration effect of SF was delayed by the resistance of the surface layer at early age. However, the grafted PAA layer eventually dropped in alkali solution after 6 hours, and the hydration rate was increased again and continued for long time. This work indicated that surface-modified SF was well dispersed and was able to regulate the hydration rate of cement.

Funder

National Natural Science Foundation of China

Publisher

Hindawi Limited

Subject

Civil and Structural Engineering

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