1 College of Civil Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China 2 National and Local Joint Engineering Laboratory of Road & Bridge Engineering Disaster Prevention Technology Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China 3 Gansu Changlong Highway Maintenance Technology Research Institute Co., Ltd., Lanzhou 730000, China
Abstract: In order to study the influence of different molding temperatures on the strength development of concrete under low negative temperature, the influence of four molding temperature conditions (5 ℃, 10 ℃, 15 ℃, 20 ℃) on the compressive strength of concrete under continuous ne-gative temperature (-5 ℃)environment and standard curing conditions was carried out. As the results show, (i) whether it is standard curing or negative temperature environment, the strength of concrete is positively correlated with the molding temperature (the higher the molding temperature, the higher the strength of concrete at the same age); (ii) negative temperature environment will inhibit the development of concrete strength, which makes the strength of concrete in negative temperature environment under the same molding temperature condition lower than that under standard curing; (iii) with the molding temperature increasing from 5 ℃ to 20 ℃, the age required for concrete under negative tempe-rature environment to reach 28 d strength under standard curing will be reduced by 7 d in turn, which is conducive to shortening the construction period of concrete engineering in alpine and frozen soil regions in China. Based on maturity theory, logarithmic,exponential and hyperbolic function models were used to analyze the influence of molding temperature on concrete strength under continuous negative temperature environment. By comparing the fitting accuracy between different models, it is found that logarithmic model and hyperbolic model have higher fitting accuracy. The fitting accuracy of the exponential model is poor, but the exponential model can be revised to achieve a higher fitting accuracy. According to the obtained three strength-maturity models, the logarithmic, exponential and hyperbolic models of strength-molding temperature under continuous negative temperature were further established. By comparing the predicted value of the model with the measured value, it is concluded that the logarithmic model and the hyperbolic model can be used to predict the la-ter strength of concrete, but the prediction accuracy of the early strength is low. The prediction accuracy of the two types of exponential models for the strength of concrete at different ages is high, and the prediction accuracy of the second type of exponential model is the highest, which can provide reference for the prediction of concrete strength under different molding temperature conditions in alpine permafrost regions of China.
龙朝飞, 张戎令, 段运, 郭海贞, 肖鹏震, 段亚伟. 基于成熟度理论持续负温下不同入模温度工况的混凝土强度预测模型[J]. 材料导报, 2022, 36(6): 20100044-8.
LONG Zhaofei, ZHANG Rongling, DUAN Yun, GUO Haizhen, XIAO Pengzhen, DUAN Yawei. Prediction Model of Concrete Strength at Different Molding Temperature Conditions Based on Maturity Theory Under Continuous Negative Temperature. Materials Reports, 2022, 36(6): 20100044-8.
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2022, Vol. 36 
