Influence of the Coupling Action of Flexural Load and Freezing–Thawing on the Chloride Diffusion of Marine High-Performance Concrete

The chloride diffusion of marine high-performance concrete under a couple actions, flexural load and freezing–thawing, was investigated by fast freezing thawing test in NaCl solution. Concrete specimens 100 × 515 mm were tested bending 300 freeze–thaw cycles the stress levels 15%, 30%, 50% ultimate fracture modulus. change microstructure analyzed SEM MIP. results indicated that coefficient coupling effect freezing–thawing or simple increased with increasing level, approximately exponential to as D = 0.8777e1.668σ for actions 0.8336e1.3231σ load. resistance ability reduced procedures, resisted dropped more severely than at same level. Micro-cracks interfacial transition zone between aggregate paste matrix induced which average pore size total volume, resulting modification distribution concrete. influence on greater