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Thermal Conductivity of Seawater Cement-Based Materials: Effect of Water-to-Cement Ratio, Curing Age, Sand Content, and Porosity.

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Title: Thermal Conductivity of Seawater Cement-Based Materials: Effect of Water-to-Cement Ratio, Curing Age, Sand Content, and Porosity.
Authors: Du, He1 (AUTHOR) duhe3@mail2.sysu.edu.cn, Chen, Yuxuan2 (AUTHOR) chenyx559@mail2.sysu.edu.cn, Yan, Han3 (AUTHOR) wtl820520@163.com, Song, Baocang4 (AUTHOR) 30073232@qq.com, Liu, Jiankun5 (AUTHOR) liujiank@mail.sysu.edu.cn, Liang, Siming6 (AUTHOR) liangsm8@mail.sysu.edu.cn
Source: Journal of Materials in Civil Engineering. Sep2023, Vol. 35 Issue 9, p1-11. 11p.
Subjects: Thermal conductivity, Seawater, Porosity, Petrophysics, Seawater salinity, Sand, Pore water, Water salinization
Abstract: The microstructures of seawater cement-based materials normally are influenced by the salinity in seawater, which could result in different properties. The thermal conductivity (λ -value) of seawater cement-based materials is a key input parameter for the heat transfer analysis. However, few studies have been conducted on this issue. This study investigated the λ -value of seawater cement-based materials using experimental and numerical methods. The influences of water-to-cement (w/c) ratio, curing age, and sand content on the λ -value of seawater cement-based materials were examined experimentally. Then a three-dimensional mesoscale finite-element model was established to assess the influences of pore size and porosity on the λ -value of cement-based materials. It was found that the λ -value of seawater cement-based materials increases with increasing curing age or sand content, and a low w/c ratio contributes to a high λ -value, similar to that of the tap-water cementitious material. The λ -value of seawater cement paste with curing ages of 1 and 7 days was slightly greater than that of the tap-water cement paste. However, no significant difference was found between the λ -values of the 28-day seawater and tap-water cement pastes. Pore size had a negligible influence on the λ -value. The λ -value of cement-based materials decreased with increasing porosity, and the decrease in λ -value of cement-based materials with pores filled with air was more significant than that with pores filled with water, indicating that the pore-water saturation has a great effect on the thermal conductivity. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:The microstructures of seawater cement-based materials normally are influenced by the salinity in seawater, which could result in different properties. The thermal conductivity (λ -value) of seawater cement-based materials is a key input parameter for the heat transfer analysis. However, few studies have been conducted on this issue. This study investigated the λ -value of seawater cement-based materials using experimental and numerical methods. The influences of water-to-cement (w/c) ratio, curing age, and sand content on the λ -value of seawater cement-based materials were examined experimentally. Then a three-dimensional mesoscale finite-element model was established to assess the influences of pore size and porosity on the λ -value of cement-based materials. It was found that the λ -value of seawater cement-based materials increases with increasing curing age or sand content, and a low w/c ratio contributes to a high λ -value, similar to that of the tap-water cementitious material. The λ -value of seawater cement paste with curing ages of 1 and 7 days was slightly greater than that of the tap-water cement paste. However, no significant difference was found between the λ -values of the 28-day seawater and tap-water cement pastes. Pore size had a negligible influence on the λ -value. The λ -value of cement-based materials decreased with increasing porosity, and the decrease in λ -value of cement-based materials with pores filled with air was more significant than that with pores filled with water, indicating that the pore-water saturation has a great effect on the thermal conductivity. [ABSTRACT FROM AUTHOR]
ISSN:08991561
DOI:10.1061/JMCEE7.MTENG-15810