Abstract: 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.

Key words: gobi region;concrete box girder;heat of hydration;strain;microstructure