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Abstract

Due to the hydration heat reaction of concrete during the construction of the mass cap in winter, the temperature inside and outside the cap is greatly different, and the water temperature of the cooling pipe is difficult to control, which is easy to produce large stress and lead to cracks. In this paper, by means of high-frequency temperature monitoring and high-density measurement point layout, finite element software was used to simulate the humidity change process of large-scale concrete construction on the mass cap. The calculated results were consistent with the measured temperature change trend, and the maximum percentage of peak temperature reduction was 1.60% when the inlet temperature was reduced by 5 °C. The maximum tensile stress near the cooling pipe increased by 4.98%, and the sensitivity of inlet temperature to the tensile stress near the cooling pipe was greater than the peak temperature. Combined with a self-circulation water tank, cotton quilt insulation, and other reasonable temperature control measures, the set control goal was achieved, and the temperature control scheme was verified to be reasonable. It is recommended that for the mass cap constructed in winter, the inlet temperature of the cooling pipe should not be lower than 5 °C, and 10–25 °C is appropriate. The mold removal time around the cap should be controlled to 4–5 days, and the thermal insulation maintenance should be carried out immediately after the mold removal to ensure the construction quality of the mass cap.

Publication Date

11-24-2023

DOI

10.14048/j.issn.1671-2579.2023.05.016

First Page

91

Last Page

95

Submission Date

March 2025

Reference

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