隧道花岗岩洞渣骨料在C50混凝土预制T梁中的应用研究

Research on Application of Tunnel Granite Cave Slag Aggregate in C50 Concrete Precast T-Beam

依托三峡翻坝江北高速公路项目,将隧道花岗岩洞渣加工成机制砂石骨料,并制备了C50混凝土预制T梁,通过T梁静载试验和T梁混凝土专用回弹测强曲线试验,研究了花岗岩洞渣机制骨料在C50混凝土预制T梁中的应用技术。结果表明:利用花岗岩洞渣生产的机制砂石骨料可以配制出工作性、力学性能与耐久性优良的T梁用C50混凝土,且混凝土T梁的刚度、强度及抗裂性均满足设计要求;通过试验建立的T梁用C50混凝土专用回弹测强曲线较国家通用测强曲线更精确。

Relying on the Three Gorges Fanba Jiangbei Highway Project,the tunnel granite cave slag was processed into machine-made sand and gravel aggregate,and the C50 concrete precast T-beams were prepared.Through T-beam static load test and T-beam concrete rebound strength test curve test,the application technology of granite cave slag machine-made aggregate in C50 concrete precast T-beam was studied.The results show that the machine-made sand and gravel aggregate produced from granite cave slag can be used to formulate C50 concrete for T-beams with excellent workability,mechanical properties and durability,and the stiffness,strength and crack resistance of the precast T-beams meet the design requirements.The special rebound strength test curve for C50 concrete for T-beams established through experiments is more accurate than the national general strength test curve.