Acceleration of cement hydration from supplementary cementitious materials: Performance comparison between silica fume and hydrophobic silica SCIE SCOPUS

Cited 28 time in WEB OF SCIENCE Cited 29 time in Scopus
Title
Acceleration of cement hydration from supplementary cementitious materials: Performance comparison between silica fume and hydrophobic silica
Author(s)
Jeong, Y.; Kang, S.-H.; Kim, M.O.; Moon, J.
Publication Year
2020-09
Abstract
This study investigated the effect of the incorporation of the supplementary cementitious material (SCM) of hydrophobic silica and silica fume on the mechanical properties and hydration behavior of ordinary Portland cement (OPC). Silica fume is a well-known SCM owing to its good compatibility with OPC by providing seeding sites for nucleation and subsequent acceleration and reactive silica for pozzolanic reaction. This study revealed that mortars containing hydrophobic silica developed higher compressive strength than pure mortar and mortar with regular silica fume during all curing ages. Furthermore, it was confirmed that it contributed to produce more hydration products and consume more portlandite, implying its acceleration and pozzolanic reaction, respectively. Although its particle size is larger than that of silica fume, its hydrophobicity accelerated the hydration reaction due to the better dispersion of OPC in the system, which leads to more exposure of cement particles to available water. These effects could cause higher dissolution of the particles and faster interfacial precipitation of hydration products. Therefore, the hydrophobic silica outperformed the seeding-based acceleration effect of silica fume.
ISSN
0958-9465
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/38587
DOI
10.1016/j.cemconcomp.2020.103688
Bibliographic Citation
CEMENT & CONCRETE COMPOSITES, v.112, 2020
Publisher
ELSEVIER SCI LTD
Keywords
Hydrophobic silica; Supplementary cementitious materials; Silica fume; Pozzolanic reaction; Cement hydration
Type
Article
Language
English
Document Type
Article
Publisher
ELSEVIER SCI LTD
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