关键词: 水工混凝土, PVA纤维, 体积掺量, 抗冲磨性, 劈裂抗拉强度, 微观形貌

Abstract: In order to improve the abrasion resistance of hydraulic structures, we investigated into the influence of volumetric content of PVA fiber on the strength and abrasion resistance of hydraulic concrete at different curing ages, and also analyzed the micro-morphology of PVA fiber-added concretes. Compared with baseline group, the concrete samples added with 0.2% PVA fiber in volumetric content boasts larger compressive strength, splitting tensile strength, and abrasion resistance strength, up by 20.8%, 33.2%, and 108.4%, respectively, yet meanwhile smaller wearing depth and mass wear rate, down by 34.2% and 3.9%, respectively. Micro-morphology analysis reveal that the PVA fiber is well dispersed in the concrete matrix and distributed in random directions when its volumetric content is 0.2%. In association with SEM analysis, we can conclude that PVA fiber of suitable dosage would enhance the strength and abrasion resistance of hydraulic concrete remarkably.

Key words: hydraulic concrete, PVA fiber, volumetric content, abrasion resistance, splitting tensile strength, micro-morphology