江市特大桥箱梁混凝土早期力学性能实验研究

Experimental Study on Mechanical Properties of Early-age Concrete in the Box Girder of Jiang Shi Bridge

混凝土的力学性能直接影响桥梁结构的安全和工作性能,有必要对其进行现场测试研究。根据标准试验方法,分别测定了江市特大桥箱梁混凝土的抗压强度、回弹值、弹性模量等早期物理力学性能参数,得出了现场养护和标准养护两种条件下混凝土的力学性能发展规律,建立了江市特大桥箱梁混凝土专用测强曲线,确定了混凝土随龄期增长变化的物理力学参数发展模式,并对现场施工提出了若干建议,对施工具有指导意义。

Mechanical properties of concrete directly affect the performance of the bridge struc- ture. According to the standard test method, the physical and mechanical parameters of the early-age concrete, including the concrete rebounding value, compressing strength and elastic modulus, which was used in the box girder of the Jiangshi bridge, were measured, The law of mechanical properties develop- ment of the concrete under site curing and standard curing was obtained, and a dedicated concrete strength curve was established for Jiangshi bridge. The development model of physical and mechanical parameters of concrete with the age growth was also established.