The existence of amorphous phase in Portland cements: Physical factors affecting Rietveld quantitative phase analysis

Snellings, Ruben; Bazzoni, Amélie; Scrivener, Karen

doi:10.1016/j.cemconres.2014.03.002

Cited by 135 publications

(43 citation statements)

References 46 publications

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“…The chemical and mineralogical composition of the starting materials are given in Table 2. The chemical composition was determined by X-Ray Fluorescence (XRF) spectrometry, the mineralogical composition by X-Ray Diffraction (XRD) using Rietveld refinement and the external standard approach as in Snellings et al [35]. The particle size distribution of the SCMs was measured by laser diffraction using isopropanol as the dispersing medium.…”

Section: Methodsmentioning

confidence: 99%

Rapid screening tests for supplementary cementitious materials: past and future

2015

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Rapid screening tests for supplementary cementitious materials (SCMs) have been in use for over 150 years. Over the years a multitude of methods have been put forward to predict the strength development of SCM blended mortars and concrete. This paper summarizes and rationalizes the main approaches and then applies them to a selection of materials that cover a broad range of SCMs, both pozzolanic and hydraulic. Included are siliceous fly ash, blast furnace slag, natural pozzolan, metakaolin and an inert quartz filler. The selected test methods are the Chapelle test, the Frattini test, active silica and alumina extractions, a dissolution rate test, and a new calorimetry-based test. The results are compared, interpreted and discussed in view of their aim of predicting the compressive strength development. Finally, a new test method is proposed that relates the cumulative heat of the SCM reaction in a simplified model system to the compressive strength development in standardized mortars. The new method is practical, repeatable and applicable to a wide range of SCMs (both pozzolanic and hydraulic), it furthermore reduces the experiment duration by a factor of 10 and correlates well to the compressive strength development of blended cement mortar bars.

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Section: Methodsmentioning

confidence: 99%

Rapid screening tests for supplementary cementitious materials: past and future

2015

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“…The XRD data collected on fresh slices were analyzed using the X'Pert High Score Plus v3.0e software package by PANalytical. The Rietveld refinement strategy for quantitative phase analysis is detailed in [28][29][30]. The hydrated pastes were analyzed according to the external standard method as described by [31].…”

Section: Blended Cement Hydrationmentioning

confidence: 99%