码头面层纤维混凝土抗冲击性能的试验研究与评价

Experimental study and evaluation on the impact resistance performance of fiber reinforced concrete used on surface layer of wharf pavement

在C30素水泥混凝土中分别添加杜拉纤维、尼龙纤维、钢纤维配制纤维混凝土,标准养护28 d后进行抗弯曲冲击试验研究。以初裂次数、终裂次数、冲击韧性评价混凝土抗冲击性能的优劣。试验结果表明:在设定的落锤抗弯曲冲击试验方法基础上添加钢纤维混凝土、杜拉纤维混凝土、尼龙纤维混凝土,其冲击韧性分别是素混凝土冲击韧性的15.1倍、3.4倍、2.7倍。素混凝土冲击破坏突出表现为脆性断裂破坏,纤维混凝土冲击破坏表现为韧性断裂破坏。3种纤维混凝土的抗冲击性能均较素混凝土有较大的提高,其中钢纤维混凝土的抗冲击性能最强,其次是杜拉纤维混凝土。

The fiber reinforced concrete with Dura fiber,nylon fiber and steel fiber respectively added into C30 plain concrete,curing under standard condition for 28 days,was used for flexural impact resistance performance experiment.The impact resistance property was evaluated by initial cracking times,final cracking times and impact toughness.The result shows that the impact toughness of steel fiber concrete,Dura fiber concrete and nylon fiber concrete is respectively 15.1,3.4,2.7 times of the plain concrete.The flexural failure of plain concrete after impact damage shows brittle fracture mode,but the fiber reinforced concrete shows ductile fracture failure mode.All of the fiber reinforced concrete improves the impact resistance property much more compared with the plain concrete.The impact resistance of steel fiber reinforced concrete is the best,and that of the Dura fiber reinforced concrete is the secondly strongest.