期刊
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
卷 100, 期 7, 页码 3316-3328出版社
WILEY
DOI: 10.1111/jace.14859
关键词
C3S; filler effect; limestone; nucleation; quartz
资金
- National Science Foundation [1235269, 1401533]
- Federal Highway Administration [DTFH61-13-H-00011]
- Directorate For Engineering [1253269] Funding Source: National Science Foundation
- Div Of Civil, Mechanical, & Manufact Inn [1253269] Funding Source: National Science Foundation
- Div Of Civil, Mechanical, & Manufact Inn
- Directorate For Engineering [1401533] Funding Source: National Science Foundation
The partial replacement of ordinary portland cement (OPC) by fine mineral fillers accelerates the rate of hydration reactions. This acceleration, known as the filler effect, has been attributed to enhanced heterogeneous nucleation of C-S-H on the extra surface provided by fillers. This study isolates the cause of the filler effect by examining how the composition and replacement levels of two filler agents influence the hydration of tricalcium silicate (T1-Ca3SiO5; C3S), a polymorph of the major phase in ordinary portland cement (OPC). For a unit increase in surface area of the filler, C3S reaction rates increase far less than expected. This is because the agglomeration of fine filler particles can render up to 65% of their surface area unavailable for C-S-H nucleation. By analysis of mixtures with equal surface areas, it is hypothesized that limestone is a superior filler as compared to quartz due to the sorption of its aqueous CO32- ions by the C-S-Hwhich in turn releases OH- species to increase the driving force for C-S-H growth. This hypothesis is supported by kinetic data of C3S hydration occurring in the presence of CO32- and SO42- ions provisioned by readily soluble salts. Contrary to prior investigations, these results suggest that differences in heterogeneous nucleation of the C-S-H on filler particle surfaces, caused due to differences in their interfacial properties, have little if any effect on C3S hydration kinetics.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据