海洋环境下湿态混凝土力学性能时变规律研究

Study on time-varying law of mechanical properties of wet concrete in the marine environment

海洋环境下的湿态混凝土力学性能由于其所处环境变得更为复杂。掌握其力学性能随其饱和度变化的时变规律对混凝土结构设计和耐久性维护十分重要。该研究结合实际工况,通过理论分析和力学性能试验,对湿态混凝土轴心抗压强度、弹性模量和泊松比随其饱和度变化的时变规律进行了系统研究。研究结果表明:4种强度的混凝土单轴轴心抗压强度在浸泡28 d内变化趋势较多,到达28 d时较初始状态均下降,下降比例在7%~14%之间。4种强度混凝土的弹性模量和泊松比浸泡28 d内变化趋势较多,到达28 d时较初始状态均上升,弹性模量升高比例在5%~7%之间,泊松比升高比例在10.5%~23.5%之间。该研究对水运工程湿态混凝土力学性能研究具有积极的推动作用。

The mechanical properties of wet concrete in the marine environment are more complicated because of its environment.The time-varying law of its mechanical properties with its saturation is known to be very important for the design and durability of concrete structures.In this study,the time-varying law of the axial compressive strength,elastic modulus and Poisson′s ratio of wet concrete varying with its saturation was studied through theoretical analysis and mechanical property test.The results show that the axial compressive strength of the four kinds of concrete changed a lot within 28 days after immersion.When the concrete reached 28 days,it decreased compared with the initial state,and the decrease ratio was between 7%and 14%.The elastic modulus and Poisson′s ratio of four kinds of strength concrete change more in 28 days than in the initial state.When the concrete reaches 28 days,the increase ratio of elastic modulus was between 5%and 7%,and the increase ratio of Poisson′s ratio was between 10.5%and 23.5%.This study has a positive role in promoting the field of mechanical properties of wet concrete in water transport engineering.