基于氯离子渗透机制的超高性能混凝土生命周期预测

Based on the existing concrete life cycle prediction theory,the life cycle prediction of ultra-high performance concrete members with special structure is carried out according to the experimental results.The chloride penetration test of ultra-high performance concrete (UHPC) specimens was carried out,in which the chloride ion concentrations at different depth were measured.Functions between the chloride ion concentration and depth are established.Chloride ion diffusion coefficient of ultra-high performance concrete is calculated theoretically,and the service life of ultra-high performance concrete could be calculated.The results show that,even if the reinforced protection layer is smaller,in the environment of seawater intrusion or deicing salt environment,ultra high performance concrete product service life could be more than 50 years,which means that the UHPC has the value of engineering utilization.Chloride ion permeation mechanism could be used as an effective means of life cycle prediction of UHPC.