玄武岩纤维增强混凝土的力学性能研究

摘要

Fiber-reinforced concrete (FRC) has become a viable new material used in various constructions such as building pavements,large industrial floors,and runways.In this research,basalt chopped fibers in filament form were used to develop an FRC material called basalt fiber-reinforced concrete (BFRC) to study the possible improvement in the 28-day compressive strength and modulus of rupture,though the latter one is more important for the construction of pavements,industrial floors,and runways.The basalt fiber specimens were cast using basalt filament fibers of three different lengths and three different amounts.Clumping of fibers at high fiber amounts caused mixing and casting problems.These problems become even more severe when long fibers are used at the high fiber dosage amount.The results indicated that 36-mm-long chopped basalt filament fiber and a fiber amount of 8 kg =m3 are optimum for achieving high performance in both the compressive strength and modulus of rupture.This paper discusses the test matrix and test results obtained from various BFRC and plain concrete specimens.%纤维增强混凝土(Fiber-Reinforced Concrete,FRC)作为一种可靠的新型材料已经被广泛应用于建造路面、大型工业地板和机场跑道.采用玄武岩短切纤维开发了一种称为玄武岩纤维增强混凝土(Basalt Fi-ber-Reinforced Concrete,BFRC)的FRC材料,以寻求混凝土28 d抗压强度和断裂模量的改善,鉴于断裂模量对路面、工业地板和机场跑道建设的重要性.成型了不同纤维长度和纤维掺量的玄武岩纤维混凝土试件.过高的纤维掺量会导致纤维结团,不利于混凝土的拌和与成型,使用长纤维会使这一问题更加严重.结果表明:玄武岩纤维长度为36 mm,掺量为8 kg/m3时,混凝土的抗压强度和断裂模量最佳.讨论了不同玄武岩纤维混凝土和普通混凝土的试验结果.