GRADIENTS OF MICROSTRUCTURE AND DIFFUSION PROPERTIES IN CEMENT PASTE CAUSED BY DRYING

This paper demonstrates that the microstructure of hydrated cement paste varies with distance from an exposed, drying face. Supporting measurements of cement hydration, adsorption capacity, porosity and diffusion rate are reported for an ordinary portland cement and an ordinary portland/pulverised fuel ash blended cement at ages of 28 and 163 days. Possible causes of the microstructural gradients are discussed in relation to the effects of (a) moisture condition upon cement hydration and pore structure changes and (b) carbon dioxide upon cement hydrates and porosity. The practical implications of microstructural gradients are discussed with particular reference to the region immediately below the exposed surface. (Author/TRRL)

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Corporate Authors:
Pergamon Press, Incorporated

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Elmsford, NY United States 10523
Authors:
- PATEL, R G
- Parrott, C J
- Martin, S A
- Killoh, D C
Publication Date: 1985-3

Media Info

Features: Figures; References; Tables;
Pagination: p. 343-356
Serial:
- Cement and Concrete Research
- Volume: 15
- Issue Number: 2
- Publisher: Elsevier
- ISSN: 0008-8846
- Serial URL: http://www.sciencedirect.com/science/journal/00088846

Subject/Index Terms

TRT Terms: Adsorption; Carbon dioxide; Cement paste; Drying; Fly ash; Highway grades; Hydrates; Microstructure; Moisture content; Optical diffusion; Porosity; Portland cement; Slopes; Surfaces
ITRD Terms: 7154: Adsorption; 4767: Cement paste; 6769: Diffusion; 5184: Drying; 4580: Fly ash; 2806: Gradient; 5920: Moisture content; 5938: Porosity; 6438: Surface
Subject Areas: Highways; Materials; Planning and Forecasting; I32: Concrete; I72: Traffic and Transport Planning;

Filing Info

Accession Number: 00396944
Record Type: Publication
Source Agency: Transport Research Laboratory
Files: ITRD, TRIS
Created Date: Aug 25 2004 2:39AM