大体积毛石混凝土在控制温度裂缝方面的应用

Application of Mass Rubble Concrete in Control of Temperature Crack

针对重庆市南川神童镇污水处理厂工程C20混凝土挡土墙绝热温升(60.19℃)和内外温差(17.76℃)过高造成温度裂缝的问题,考虑到当地多阴雨、湿度大的气候特点,在比较其他控制裂缝方法的基础上,采用大体积毛石混凝土,毛石体积掺量为20%,热工计算后发现,结构的绝热温升值(48.15℃)和内外温差(14.20℃)明显下降,温度应力为0.76N/mm2,有效控制了由于温度应力造成的温度裂缝.在未采取其他措施的情况下,实施效果良好.通过工程实践进一步验证了大体积毛石混凝土在控制温度裂缝方面的作用.

According to the problem of temperature crack caused by C20 concrete retaining wall with the high adiabatic temperature （60.19 ℃） and the temperature of center and surface （17. 76 ℃） for Chongqing Nanchuan Wastewater Treatment Plant, mass rubble concrete is applied to the control of the crack based on the local rainy and humidity climate characteristics and the comparison of other crack control methods. Incorporation of rubble is 20% per cubic meter, thermotechnical calculation showed the adiabatic temperature （48. 15 ℃） and the temperature of center and surface （14.20 ℃ ） decreases obviously, and thus thermal stress is 0. 76 N/ram2. The results are good without other maintenance measures. The paper further verifies that mass rubble concrete plays a positive role in control of such temperature cracks.