结合镇(宁)胜(境关)高速公路大桥和隧道施工中应用机制砂拌制高强度泵送混凝土的经验,介绍了机制砂的特点、生产工艺及机械设备选择、配合比设计、施工应用等施工技术问题,为机制砂的应用和生产提供参考。 Combining experience of mixing sand with high-strength concrete in sand bridge construction and tunnel construction of Zhenning (Jingguan) Expressway Bridge, this paper introduces the characteristics of sand, the production technology, the selection of mechanical equipment, the mix design, the construction application And other construction technology, for the application of sand and production of reference.