随着我国公路桥梁的日益展发,我省预应力钢筋混凝土桥梁也从70年代初期50多米跨度发展到现在正在修建的180m 的大跨度预应力钢筋混凝土公路桥。为了加快建桥速度,保证工程质量、降低工程造价,满足 R_(3d)的强度达到36MPa 的预应力张拉需要,我省大部分的预应力桥梁均采用 FDN 减水剂来配制高强混凝土,起到了良好作用。在配合比的选择上,我们根据以往的经验,采用 With the development of highway bridges in our country, the prestressed reinforced concrete bridges in our province have also developed from the span of more than 50 meters in the early 1970s to the 180 m long-span prestressed reinforced concrete highway bridges now under construction. In order to speed up the construction of the bridge, ensure the quality of the project, reduce the construction cost and meet the prestressing tension of R_ (3d) reaching 36MPa, most prestressed bridges in our province adopt FDN superplasticizer to prepare high strength concrete. To a good effect. In the choice of mix, we use based on past experience