Abstract
The surface temperature of a testing sample should be immediately adjusted to equal to the central point when testing adiabatic temperature rise of concrete. However, due to the insufficient tracking accuracy, there are temperature differences between the environment and the central point temperature. In this paper, the heat loss of the sample is deduced based on thermal balance equation and an assumption that the heat passing through cylindrical surface temperature and through the two ends of the sample do not affect each other, and the total heat losses of the sample can be calculated by adding the heat passing through cylindrical surface and the heat passing through two ends. Then, according to the relationship between heat and temperature, the maximum error caused by the adiabatic temperature rise testing device was deduced, and the proposed measurement accuracy of the adiabatic temperature rise testing device was presented. According to the results of the verification case, a corrective constant should be used to modify the deduction.
Highlights
Thermal crack is one of the most common problems of concrete structures, and hydration behaviors of the concrete should be taken into consideration when calculating concrete temperature.The adiabatic temperature rise of ordinary Portland cement can be precisely tested by adiabatic temperature rise testing devices [1]
The maximum error caused by the adiabatic temperature rise testing device was analyzed, and the accuracy was verified using the finite element analysis
The surface temperature of a testing sample should be immediately adjusted to equal to the central point when testing adiabatic temperature rise of concrete
Summary
Thermal crack is one of the most common problems of concrete structures, and hydration behaviors of the concrete should be taken into consideration when calculating concrete temperature. The adiabatic temperature rise of ordinary Portland cement can be precisely tested by adiabatic temperature rise testing devices [1]. The adiabatic temperature rise of moderate heat concrete mixed with fly ash is hard to be tested. Low heat concrete is more widely used because when compared with the ordinary Portland cement, the moderate heat and low heat cement contains more dicalcium silicate which has a low calorific value. Moderate and low heat cement contains fewer elements with high calorific values such as tricalcium silicate. The generation of heat during hydration of moderate or low heat concrete mixed with fly ash is an ongoing process, contributing to cracking in concrete dams due to the substantial interior temperature rise after water cooling the material [3 - 6]. Methodologies and measuring devices alike intended to improve the measurement accuracy of concrete
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