A combined QXRD/TG method to quantify the phase composition of hydrated Portland cements

Journal Article · Sat Jun 15 04:00:00 EDT 2013 · Cement and Concrete Research

DOI:https://doi.org/10.1016/J.CEMCONRES.2013.02.007· OSTI ID:22220797

Soin, Alexander V.; Catalan, Lionel J.J. ^[1]

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1. Department of Chemical Engineering, Lakehead University, 955 Oliver Road, Thunder Bay, Ontario P7B 5E1 (Canada)

A new method is reported for quantifying the mineral phases in hydrated cement pastes that is based on a combination of quantitative X-ray diffractometry (QXRD) and thermogravimetry (TG). It differs from previous methods in that it gives a precise measure of the amorphous phase content without relying on an assumed stoichiometric relationship between the principal hydration products, calcium hydroxide (CH) and calcium silicate hydrate (C–S–H). The method was successfully applied to gray and white ordinary Portland cements (GOPC and WOPC, respectively) that were cured for up to 56 days. Phase distributions determined by QXRD/TG closely matched those from gray-level analysis of backscattered scanning electron microscope (BSEM) images, whereas elemental compositions obtained for the amorphous phase by QXRD/TG agreed well with those measured by quantitative energy dispersive X-ray spectroscopy (EDS)

• OSTI ID: 22220797
• Journal Information: Cement and Concrete Research, Journal Name: Cement and Concrete Research Vol. 48; ISSN 0008-8846; ISSN CCNRAI
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AMORPHOUS STATE
CALCIUM HYDROXIDES
CALCIUM SILICATES
HYDRATES
HYDRATION
PORTLAND CEMENT
SCANNING ELECTRON MICROSCOPY
THERMAL GRAVIMETRIC ANALYSIS
X-RAY DIFFRACTION
X-RAY SPECTROSCOPY