Optimization of dam concrete temperature control standard based on concrete thermal cracking test

Abstract

In this paper, the influence of temperature drop rate at an early age on the thermal cracking risk of concrete was investigated by using concrete thermal cracking test. The temperature drop rates of 1℃/day and 0.5℃/day were set. The test results showed that under the condition of the same temperature drop, the temperature drop rate of 1℃/day can effectively reduce the tensile stress caused by temperature drop, and the cracking temperature can be reduced by more than 8%. The test results verify that the concrete should be cooled to the target temperature as soon as possible provided that the tensile stress is less than tensile strength. This test can effectively optimize the temperature control standard of dam concrete quantitatively and improve the safety of dam construction period.