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水泥材料力学特性、外界气温变化和约束条件等多种因素综合影响着混凝土体内外温差,进而控制着大体积混凝土温度裂缝性状产生和发展.为了把握中空箱型截面梁大体积混凝土体内温度变化发展模式,在工地实测资料的基础上,用MATLAB建立数学模型作仿真分析.结果表明,混凝土内部温度随时间的变化规律服从双峰正态分布,在混凝土浇捣后30.3小时和102.8小时分别达到第一和第二个峰值:混凝土内部与表面的温度差随时间变化呈现正态分布模式,在混凝土浇捣后32.5小时混凝土内外温差达到峰值.在综合调查分析实际施工条件、技术和方法的基础上,提出了大体积混凝土施工阶段温度裂缝防范措施.
The mechanical properties of cement, the change of outside air temperature and the constraints and other factors affect the temperature difference between the inside and outside of the concrete body, and then control the occurrence and development of the temperature cracks in the mass concrete.In order to grasp the development of the mass concrete temperature change Model was established on the basis of the measured data of the site and the mathematic model was established by MATLAB for simulation analysis.The results showed that the law of the internal temperature of concrete obeyed the bimodal normal distribution with the time varying from 30.3 hours to 102.8 hours The first and second peaks: the temperature difference between the inside and the surface of the concrete presents a normal distribution pattern over time, and the difference between the inside and outside of the concrete reaches the peak value at 32.5 hours after the concrete is poured and pounded. Based on the comprehensive investigation and analysis of the actual construction conditions, technologies and methods , Put forward a large-scale concrete construction phase temperature cracks prevention measures.