高性能水泥基材料的耐久性能及其微观结构

采用加速扩散法、Na2SO4溶液浸泡法、快冻法、快速碳化法分别研究了普通混凝土(Ordinary Concrete,简称OC)、高性能混凝土(High Performance Concrete,简称HPC)、低渗透混凝土(Low Permeability Concrete,简称LPC)、无细观界面过渡区水泥基材料(Meso-inter-facial transition zone-free cement-based materials,简称MIF)等4种水泥基材料的抗氯离子渗透性能、抗硫酸盐侵蚀性能、抗冻性能、抗碳化性能。结果表明:OC、HPC、LPC和MIF的抗氯离子渗透性能、抗冻性能和抗碳化性能排列顺序均为:MIF>LPC>HPC>OC,而HPC、LPC和MIF均有较好的抗硫酸盐侵蚀性能。同时,孔结构分析表明:就孔隙率、最可几孔径、孔径≥50 nm的孔含量而言,OC、HPC、LPC和MIF的排列顺序均为:MIF

Durability and microstructure of high performance cement-based materials

Chloride ion penetration resistance,sulfate attack resistance,freeze-thaw rssistance and carbonization resistance of four kinds of cement-based materials including ordinary concrete(abbr.OC),high performance concrete(abbr.HPC),low permeability concrete(abbr.LPC) and meso-interfacial transition zone-free cement-based materials(abbr.MIF) were investigated by means of accelerated diffusion method,immersed in 5% Na2SO4 solution method,accelerated freeze-thaw method and accelerated carbonization method.The results show that the order of chloride ion penetration resistance,freeze-thaw rssistance and carbonization resistance is MIF>LPC>HPC>OC,and HPC,LPC and MIF have good sulfate attack resistance.As for porosity,the most probable pore radius,and the content of the pore which radius is more than 50 nm,the order is MIF