戈壁地区不同养护方式下混凝土箱梁养护效果试验研究

Testing the Curing Effect of Concrete Box Girder under Different Curing Methods in Gobi Area

为研究戈壁地区混凝土箱梁在不同养护方式下的各项性能及在这种特殊环境下的实用性,对实验原材料在现场进行验证试验研究其养护效果。结果表明:与塑料薄膜和土工布养护相比,橡塑板养护早期强度增长更快;不同养护方式下混凝土水化热均在20 h后达到峰值,并呈现正弦规律的周期性变化,给出了箱梁的水化热温度分布规律;箱梁应变的产生是由混凝土自收缩和温度共同作用的结果,通过曲线规律分析出了收缩应变和温度应变的作用阶段;通过微观结构测试,分析出了不同养护方式下混凝土孔结构的分布特征,具有较小孔间距系数的橡塑板养护力学性能优于其他两种养护方式。

In order to study the gobi region various properties of concrete box girder under different curing methods,in the special environment of practicality,in the field experiment and verify its curing effect.The results show： compared with the plastic film curing and geotextile curing,rubber and plastic plate curing early strength growth faster. The hydration heat of concrete under different curing methods are 20 h after the peak and presented the law of sine periodic change. The hydration heat temperature distribution law of box girder is presented; Box girder strain is produced by the autogenous shrinkage of concrete and temperature is the result of joint action. The effect of shrinkage strain and temperature strain was analyzed by curve law. Through the micro structure tests,the distribution characteristics of concrete pore structure under different curing methods are analyzed. Has a hole spacing coefficient of rubber plate curing mechanical property is better than the other two curing methods.