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Study of thermal conductivity of constituent materials for electrically heated bridge decks.

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Title: Study of thermal conductivity of constituent materials for electrically heated bridge decks.
Authors: Luo, Yong1,2 (AUTHOR) luoyong@student.usm.my, Yussof, Mustafasanie M.1,2 (AUTHOR) cemustafa@usm.my, Zhang, Liyao3 (AUTHOR) 1289991932@qq.com
Source: Construction & Building Materials. Nov2024, Vol. 453, pN.PAG-N.PAG. 1p.
Subjects: High strength concrete, Bridge floors, Thermal conductivity, Snowmelt, Heat conduction
Abstract: Due to the dual requirements of its basic road use function and snow melting and deicing function, the electrically heated bridge deck inevitably requires the constituent materials of the bridge deck pavement to possess both good mechanical strength and thermal conductivity simultaneously. This paper intends to systematically analyze the mechanical strength and thermal conductivity of pavement materials such as ordinary road concrete, high thermal conductivity steel fiber concrete, and low thermal conductivity bamboo fiber concrete under multiple mix proportion schemes through indoor concrete strength tests and material thermal conductivity tests. Thus, three mix proportion schemes of pavement concrete with high mechanical strength and thermal conductivity suitable for their respective requirements are selected, and the structure layer of the electrically heated bridge deck is constructed. The results show that compared with ordinary road concrete, the thermal conductivity of steel fiber concrete has increased by 28.3 %, with a thermal conduction influence value of 1.28, further accelerating heat conduction. The thermal conductivity of bamboo fiber concrete has decreased by 31.9 %, with a thermal conduction influence value of 0.68, further blocking heat conduction, achieving directional conduction. In comprehensive comparison, selecting pavement steel fiber concrete and pavement bamboo fiber concrete as the thermal conductive surface layer and heat insulation interlayer pavement materials of the electrically heated bridge deck respectively is more ideal. This lays a solid foundation and provides practical evidence for achieving directional heat conduction and low-energy precise heating of the electrically heated bridge deck. • We have established a system of thermal conductivity of different types of concrete. • We built the structural composition framework of electrically heated bridge deck. • We realized the directional conduction function of the electrically heated bridge deck. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:Due to the dual requirements of its basic road use function and snow melting and deicing function, the electrically heated bridge deck inevitably requires the constituent materials of the bridge deck pavement to possess both good mechanical strength and thermal conductivity simultaneously. This paper intends to systematically analyze the mechanical strength and thermal conductivity of pavement materials such as ordinary road concrete, high thermal conductivity steel fiber concrete, and low thermal conductivity bamboo fiber concrete under multiple mix proportion schemes through indoor concrete strength tests and material thermal conductivity tests. Thus, three mix proportion schemes of pavement concrete with high mechanical strength and thermal conductivity suitable for their respective requirements are selected, and the structure layer of the electrically heated bridge deck is constructed. The results show that compared with ordinary road concrete, the thermal conductivity of steel fiber concrete has increased by 28.3 %, with a thermal conduction influence value of 1.28, further accelerating heat conduction. The thermal conductivity of bamboo fiber concrete has decreased by 31.9 %, with a thermal conduction influence value of 0.68, further blocking heat conduction, achieving directional conduction. In comprehensive comparison, selecting pavement steel fiber concrete and pavement bamboo fiber concrete as the thermal conductive surface layer and heat insulation interlayer pavement materials of the electrically heated bridge deck respectively is more ideal. This lays a solid foundation and provides practical evidence for achieving directional heat conduction and low-energy precise heating of the electrically heated bridge deck. • We have established a system of thermal conductivity of different types of concrete. • We built the structural composition framework of electrically heated bridge deck. • We realized the directional conduction function of the electrically heated bridge deck. [ABSTRACT FROM AUTHOR]
ISSN:09500618
DOI:10.1016/j.conbuildmat.2024.139122