Sulfate resistance of nanosilica and microsilica contained mortars
Document Type
Article
Publication Date
1-1-2016
Publication Title
ACI Materials Journal
Volume
113
Issue
4
First page number:
459
Last page number:
469
Abstract
Presented is a side-by-side comparison study intended to identify the effects of nanosilica (nS) on chemical sulfate attack resistance of portland cement (PC) mortars and its effectiveness in comparison to similar replacement levels of the more widely implemented microsilica (mS). Several mortar mixtures were prepared with a 4.1 and 7.2% tricalcium aluminate (C3A) PC by progressive cement replacement with nS or mS. The mortars tested were measured for expansion, compressive strength, and mass loss. Results indicated that nS replacement benefited the studied mortars. However, in the dry powder form and method of mixing used in this study, poor dispersion and agglomeration of the nS was suspected to hinder mortar permeability in comparison to mS and low-C3A cement mortars. Replacement with nS in aqueous dispersion, however, proved to be significantly more effective than equivalent replacement of dry powder nS and mS. © 2016, American Concrete Institute. All rights reserved.
Keywords
Durability; Microsilica; Mineral admixture; Nanosilica; Sulfate attack
Language
English
Repository Citation
Ghafoori, N.,
Batilov, I. B.,
Najimi, M.
(2016).
Sulfate resistance of nanosilica and microsilica contained mortars.
ACI Materials Journal, 113(4),
459-469.