Study on Freeze-thaw Properties of Calcium Sulfate Whisker Concrete
Research purposes:In northern China,concrete structures not only face freeze-thaw cycles but also suffer from abrasion caused by sediment and gravel during flood seasons,leading to significant durability degradation.Adding high-strength,high-modulus fibers can effectively improve durability.This study investigated the concrete used in a high-speed railway bridge in northern China.By incorporating calcium sulfate whisker(CSW),freeze-thaw and abrasion tests were conducted on C40 and C60 CSWC,and the effects on durability were analyzed.Research conclusions:(1)Incorporating CSW significantly improved the freeze-thaw and mechanical properties of CSWC.(2)The optimal surface performance under freeze-thaw and abrasion occurred with 5 kg/m³ of CSW.(3)A plastic microstrain-based freeze-thaw damage model was established to predict frost resistance durability.(4)The research results can provide a theoretical basis for the improvement of concrete durability,and have guiding significance for the practical application of CSWC in cold regions of northern China.
calcium sulfate whisker concretefreeze-thaw cycleabrasionservice life prediction
万方数据
维普
