Early-age thermal deformations of cement paste and mortar

Author(s): M. Wyrzykowski and P. Lura
Paper category: Conference
Book title: 2nd International Conference on Microstructural-related Durability of Cementitious Composites
Editor(s): Guang Ye, K. van Breugel, Wei Sun and Changwen Miao
Print ISBN: 978-2-35158-129-2
e-ISBN: 978-2-35158-123-0
Publisher: RILEM Publications SARL
Pages: 360 – 367
Total Pages: 8
Language: English

Abstract: One of the very important aspects regarding maturing of concrete is controlling the thermal deformations at early age. It is commonly known that the coefficient of thermal expansion (CTE) of cementitious materials is strongly dependent upon their moisture content. In particular, with a drop of internal relative humidity (RH), an increase of the CTE is observed. It has been shown recently that this effect can be attributed to the internal RH change associated with a temperature change. However, published data show a high scatter and moreover they mostly refer to drying and do not address the effect of self-desiccation in low water-to-cement ratio (w/c) materials.
The present work is focused on experimental determination of the CTE and the dependence of RH in pores upon changing temperature. The tests were performed on cement pastes and mortars with w/c 0.3. Next, using modeling based on the measured RH values, the CTE is back-calculated and verified against the measured values. The results indicate that the effect of RH change due to the change of temperature may reach much higher values than observed before.

Online publication: 2012
Publication Type: full_text
Public price (Euros): 0.00