Title: Supplementary Cementitious Materials in Portland- Limestone Cements

Author(s): Keshav Bharadwaj, O. Burkan Isgor, and W. Jason Weiss

Publication: Materials Journal

Volume: 119

Issue: 2

Appears on pages(s): 141-154

Keywords: clinker; limestone; portland-limestone cement (PLC); supplementary cementitious materials (SCMs); thermodynamic modeling

DOI: 10.14359/51734356

Date: 3/1/2022

Abstract:
Thermodynamic modeling was used to study the performance of portland-limestone cements (PLC) when they are combined with supplementary cementitious materials (SCMs). The type of cement (that is, I, II, III, or V) did not substantially affect the porosity; however, cements with a greater alumina content resulted in more ettringite formation than low-alumina cements in systems with similar porosity. Alumina in clinker or SCM was predicted to react with calcite to form hemi-/monocarbonate phases when calcium hydroxide is available, and strätlingite if calcium hydroxide is depleted. The decrease in the porosity was greater in the PLC+ metakaolin systems due to the higher available reactive alumina than PLC+fly ash and PLC+slag systems. SCMs can be beneficially used with PLC.