Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 25, Issue 7, Pages 3149-3157Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2010.12.005
Keywords
beta-hemihydrate; Hydration; Ultrasonic; Workability; Microstructure; Mechanical properties
Categories
Funding
- European Commission [026661-2]
- Bouwdienst Rijkswaterstaat
- Graniet-Import Benelux
- Kijlstra Betonmortel
- Struyk Verwo
- Insulinde
- Enci
- Provincie Overijssel
- Rijkswaterstaat Directie Zeeland
- AG maasvlakte
- BTE
- Alvon Bouwsystemen
- V.d. Bosch Beton
- Selor
- Twee R Recycling
- GMB
- Schenk Concrete Consultancy
- De Mobiele Fabriek
- Creative Match
- Intron
- Geochem Research
- lcopal
- BN International (chronological order of joining)
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This article addresses the microstructure and related mechanical properties of gypsum produced from beta-hemihydrate using information of its hydration process, from fresh paste to hardened gypsum. The water demand of the investigated beta-hemihydrate was determined applying the spread flow test. The flowability was studied and the deformation coefficient of the beta-hemihydrate was derived accordingly. The hydration process of the beta-hemihydrate was investigated applying an ultrasonic wave method and the influence of the water content on hydration was analyzed. The microstructure of the generated gypsum was studied by experiments and modeling. A model [1] was applied, which was successfully validated by the present experiments. Furthermore, the mechanical properties of the produced gypsum were investigated, and a numerical relation between water amount and strength was found. (C) 2010 Elsevier Ltd. All rights reserved.
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