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(续1980年第一期)根据国外资料介绍,每一段箱节从预制到顶推的作业周期一般为一周,结合万江桥的施工设备与条件及箱节结构尺寸狭小的限制,为了使混凝土获得更好的和易性保证浇筑质量,同时提高早期强度满足张拉要求以缩短箱节的作业周期,在拌制混凝土时掺用了减水剂 NNO 高浓扩散剂,按照试验配方选用的配合比为:
(Continued 1980 first phase) According to foreign information, each box section from prefabricated to the thrust of the operating cycle is generally a week, combined with Wan Jiangqiao construction equipment and conditions and the size of the box section structure restrictions, in order to make concrete access Better workability to ensure the quality of pouring, while improving the early strength to meet the requirements of the tension to reduce the box section of the cycle, when mixed in the mixing of concrete admixture superplasticizer NNO high concentration, according to the test formula selection of the mix for: