Title

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


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