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

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. e particle size distribution and surface properties of SF, as well as the cement hydration with modified SF, were investigated. e 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.is work indicated that surface-modified SF was well dispersed and was able to regulate the hydration rate of cement.

Performance Comparison between Densified and Undensified Silica Fume in Ultra-High Performance Fiber-Reinforced Concrete

“…Moreover, due to the nature of the agglomeration, it is also considered very challenging to accurately measure the particle size or size distribution of SF [ 41 ]. Although ultrasonic dispersion or sonification before measurement is somewhat effective [ 44 ], it did not show completely satisfactory results because it could not affect the strong electrical attraction of the whole particles [ 41 , 45 , 46 , 47 ]. In general, laser diffraction (LD) and dynamic light scattering (DLS) are used for particle size analysis of powder materials, with advantages such as short analysis time and good reproducibility [ 48 , 49 ].…”