江津观音岩长江大桥为结合梁桥,为防止桥面板湿接缝在约束条件下产生裂缝,该桥面板湿接缝要求采用微膨胀混凝土,以补偿混凝土的收缩、徐变。试验通过测试膨胀混凝土掺不同的膨胀剂及同种膨胀剂在不同掺量条件下的限制膨胀率,比选出桥面湿接缝混凝土所要采用的配合比、膨胀剂类型及其掺量。 Jiangjin Guanyinyan Changjiang River Bridge as a combination of bridges, in order to prevent cracks in the bridge deck wet joints under the constraints, the bridge deck wet joints require the use of micro-expansion of concrete to compensate for concrete shrinkage, creep. Test by testing the expansive mixed with different expansive expanders and expansive expansive agent under different conditions of the limited expansion rate than the selection of the bridge deck wet joint concrete to be used with the mixing ratio, type of expander and its dosage.