【摘要】 针对斜拉桥异形主塔钢混结合段的特殊构造特点和施工工艺要求,结合安徽涡河三桥工程,对C50高性能自密实微膨胀混凝土的配合比进行试验研究。在此基础上,考虑不同外加剂、掺合料掺量等因素对钢混结合段内混凝土性能的影响,进行配合比优化试验并得到钢混结合段混凝土配合比。结果表明:膨胀剂掺量对混凝土工作性能影响较大,掺量为10%时混凝土性能最佳。本试验结果有效解决了钢混结合段入模难、易收缩开裂等技术难题,为同类结构的自密实混凝土配合比试验提供了参考。更多还原

【Abstract】 In consideration of specific constructional characteristics and technology requirements of steel-concrete composite sections of cable-stayed bridge with special shaped tower,C50 high performance of self-compacting micro expansion concrete mixture proportion were studied,based on practical project Anhui Guohe River Bridge.It also presents the reasonable mixture proportion for steel-concrete composite section via tests on specimens with different contents of additives.The results indicate that expanding agent has great impact on concrete performance,with best property when content is 10%.The results can effectively solve the technical problems of the steel concrete composite,such as the difficulty of entering the mold,easy to shrink,and so on.It also provides a reference for mixture ratio test for the similar structure of self-compacting concrete.更多还原