玄武岩纤维桥梁混凝土力学与耐久性能研究
作者简介:
李忠诚,高级工程师,E⁃mail:zsjdhd445@ 126. com
作者单位:
中铁十九局集团华东工程有限公司,浙江余姚 315400
基金项目:
∗中铁十九局集团科研课题
摘要:
为研究玄武岩纤维对桥梁混凝土力学性能、耐久性能的影响规律,提高桥梁混凝土综合性能,对桥梁混凝土抗压强度、劈裂抗拉强度、抗冻性能与抗氯离子渗透性能进行了试验研究。研究结果表明,在养护龄期为 7,28d的条件下,当混凝土中玄武岩纤维掺量增加时,桥梁混凝土抗压强度均先增大后减小,28d 劈裂抗拉强度先增大后减小,质量损失率大致先减小后增大,相对动弹性模量大致先增大后减小,电通量先减小后增大。当混凝土中玄武岩纤维掺量为 0. 3%时,有助于提高桥梁混凝土抗压强度、劈裂抗拉强度、相对动弹性模量,降低质量损失率和电通量,相比素混凝土,玄武岩纤维桥梁混凝土力学性能、耐久性能更优异。

English:
In order to study the influence of basalt fibers on mechanics and durability of bridge concrete,and improve the comprehensive performance of bridge concrete, compressive strength tests, splittingtensile strength tests, frost resistance tests and chloride ion penetration resistance tests were conducted onbridge concrete. The research results show that with the increase of basalt fiber content, the compressivestrength of bridge concrete at 7,28d first increases and then decreases, the splitting tensile strength at28d first increases and then decreases, the mass loss rate roughly decreases and then increases, therelative dynamic elastic modulus roughly increases and then decreases, and the electric flux firstdecreases and then increases. The optimal dosage of basalt fiber is 0. 3%. Adding basalt fiber can helpimprove the compressive strength, splitting tensile strength, relative dynamic elastic modulus, reducemass loss rate and electric flux of bridge concrete. Compared with plain concrete, basalt fiber bridgeconcrete has better mechanical properties and durability.