荷载-硫酸腐蚀耦合下混凝土物理力学性质劣化特性OA

This paper first conducted experiments under different load-sulfuric acid corrosion coupling conditions.A general ion diffusion model was established to describe the dissolution process of solid-phase calcium,considering the effect of load,and the deterioration of concrete under sulfuric acid corrosion at different load levels was investigated.The results indicate that sulfuric acid corrosion is jointly controlled by ion diffusion and solid-phase calcium dissolution,with the corrosion rate gradually decreasing over time.Numerical simulation results closely match experimental data,confirming their reliability.Loading affects concrete through pore shrinkage and damage accumulation:low loads can inhibit corrosion,whereas high loads accelerate it.At the same loading level,corrosion under cyclic loading is higher than that under static loading,though it slightly decreases with increasing loading cycles.Steel fibers act as a barrier to sulfuric acid diffusion,reducing corrosion and slowing its rate.These findings provide a reference for the durability design and maintenance of deep tunnel structures.