机制砂与河砂海工混凝土30m预应力T梁的变形及开裂性能对比研究

Comparative Research on Deformation and Cracking Properties of 30m Prestressed T-beam Made from Manufactured Sand and River Sand Marine Concrete

通过以"28d龄期同强度等级"标准优选配合比,利用机制砂和河砂配制工作性能相近、质量优良的C50高强混凝土,通过严格控制施工开展30m预应力T梁(中梁)足尺模型试验,对比研究机制砂与河砂混凝土的实体结构的变形性能与开裂性能。研究表明:机制砂混凝土预应力T梁具有与河砂混凝土预应力T梁相当的承载能力和抗变形能力,验证了机制砂应用于海工混凝土实体结构的可行性。

The ＇28d age with the same strength level＇ standard was used to design concrete mix proportion,CSO high-strength concrete mixture was prepared by manufactured sand and river sand with similar working performance and good quality, 30m prestressed T-beam full-scale model test was carried out by strictly controlling construction, the concrete deformation and cracking properties of entity structure is comparatively studied with manufactured sand and river sand. The results show that manufactured sand concrete T-beam has a high load-carrying capacity and resistance to deformation, and it is comparative to river sand concrete prestressed T-beam, which has verified that the feasibility of the machine-made sand applied to entity structure of marine concrete.