机场道面合成纤维混凝土的耐久性

为了提高道面混凝土的耐久性,在室内对单丝聚丙烯、网状聚丙烯和聚丙烯腈纤维混凝土进行了抗渗性、抗冻性和耐磨性试验。抗渗性试验采用静水压力法和氯离子渗透法,抗冻性试验采用快冻法,耐磨性试验采用滚珠轴承法。试验结果表明:当纤维体积率为0·10%时,合成纤维混凝土的抗冻性和抗渗性比普通道面混凝土提高了40%~160%,纤维混凝土的耐磨度比普通混凝土提高了23%~50%;合成纤维的体积率为0·15%~0·18%时,混凝土的抗渗性与抗冻性最好。

Durability of synthetic fiber reinforced concrete for airport pavement

In order to improve the durability of airport pavement concrete, the impermeabilities, frost resistances and abrasion resistances of three kinds of fiber(single polypropylene, reticular polypropylene and polyacrylonitrile) reinforced concretes were tested in laboratory. Hydrostatic pressure method and chloride penetration method were used in impermeability test, fast freeze-thaw method was used in frost resistance test, and ball bearing method was used in abrasion resistance test. Test result indicates that when the volume fraction of fiber is 0.10%, the levels of the impermeabilities and frost resistances for fiber reinforced concretes increase by 40%~160% compared with normal pavement concrete, their abrasion resistances increase by 23%~50%; when the fraction is within 0.15%~0.18%, their impermeabilities and frost resistances are best. 6 tabs, 10 refs.