The effects of moisture on the thermal properties of concrete between -80 degrees C and 0 degrees C
The effects of moisture on the thermal properties of concrete between -80 degrees C and 0 degrees C
Samples of saturated moist-cured micro-concrete and pasta with vv/c ratios between 0.30 and 0.70 have been invest- igated and compared with samples of dry and rewetted paste between -80°C and 0°C. The freezable water in these pastes has been measured from the enthalpy difference between moist-cured and dry samples, and is significantly less than evaporable water contcnt. The NMR spectra of these pastes have been studied at temperatures down to -80°C and suggest that the eva- porable water is adsorbed and not free. Thermal strains of samples with different degrees of saturation between 0°C and -80°C have been measured and the effect of rewetted water also investigated. It is concluded that the physically adsorbed water which causes a large thermal strain in concrete paste comprises 75% of the total evaporable water. The permanent expansion of concrete paste during a thermal cycle only occurred in a rewetted, resoaked, fully moist-cured concrete paste.
University of Southampton
Mohd Yusof, Kamarudin Bin
6f7597bd-5af9-419a-a125-fba7e1bbe92f
1984
Mohd Yusof, Kamarudin Bin
6f7597bd-5af9-419a-a125-fba7e1bbe92f
Mohd Yusof, Kamarudin Bin
(1984)
The effects of moisture on the thermal properties of concrete between -80 degrees C and 0 degrees C.
University of Southampton, Doctoral Thesis.
Record type:
Thesis
(Doctoral)
Abstract
Samples of saturated moist-cured micro-concrete and pasta with vv/c ratios between 0.30 and 0.70 have been invest- igated and compared with samples of dry and rewetted paste between -80°C and 0°C. The freezable water in these pastes has been measured from the enthalpy difference between moist-cured and dry samples, and is significantly less than evaporable water contcnt. The NMR spectra of these pastes have been studied at temperatures down to -80°C and suggest that the eva- porable water is adsorbed and not free. Thermal strains of samples with different degrees of saturation between 0°C and -80°C have been measured and the effect of rewetted water also investigated. It is concluded that the physically adsorbed water which causes a large thermal strain in concrete paste comprises 75% of the total evaporable water. The permanent expansion of concrete paste during a thermal cycle only occurred in a rewetted, resoaked, fully moist-cured concrete paste.
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Published date: 1984
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Local EPrints ID: 459572
URI: http://eprints.soton.ac.uk/id/eprint/459572
PURE UUID: 694b0c53-e99e-4be6-87b2-47e8cfb7f0ac
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Date deposited: 04 Jul 2022 17:14
Last modified: 16 Mar 2024 18:31
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Author:
Kamarudin Bin Mohd Yusof
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