Open AccessThe Study of Factors on the Heat Transfer Characteristics of Interface between Cast-in-Place Concrete and Frozen Soil
Author(s) -
Yanjun Ji,
Yupu Hu,
Tao Luo
Publication year - 2019
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.179
H-Index - 26
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/304/5/052079
Subject(s) - heat transfer , materials science , geotechnical engineering , pile , phase change , heat flux , composite material , mechanics , geology , thermodynamics , physics
The heat transfer characteristics of cast-in-place concrete-frozen soil contact surface directly affect the surface freezing strength of cast-in-place pile, and it is important to study the heat transfer characteristics of cast-in-place concrete-frozen soil contact surface for Pile Foundation design and construction in frozen soil area. Based on the small model pile test, a numerical analysis model is established to calculate the heat transfer characteristics during concrete poured in situ. The results show that the heat flow of 0.5h concrete and the contact surface of frozen soil increases by 381.2% when the pouring temperature raised from 5 to 30°C. The water-cement ratio increased from 0.4 to 0.6, and the heat flux of 0.5h contact surface is reduced by 23.7%. The temperature of the contact surface increased first and then decreased, and the peak is near the liquid limit of soil. When the temperature of frozen soil decreased from -1 to -3°, the temperature of the contact surface increased with the decrease of the temperature of the frozen soil. The thermal conductivity and transformation of the thermal effect of phase transition have played a decisive role. 0~1h (especially 0~0.5h) is the main time for the heat released from concrete to frozen soil.