为研究玄武岩纤维的耐碱性能及其对混凝土力学性能的影响规律,试验将玄武岩纤维分别置于不同碱浓度、不同温度的溶液中浸泡1天、3天和5天后,测最其质量损失率;并在偏光显微镜下观察腐蚀后的表面形貌;同时研究了3种不同幺武岩纤维掺量的混凝土强度性能,采用SEM观察混凝土中纤维的腐蚀情况.结果表明,随着碱溶液浓度和浸泡温度的提高,纤维的质量损失率增加,表面剥落严重.玄武岩纤维混凝土与空白样相比7天的力学性能变化不大,而养护28天的抗压、抗折强度则随纤维掺量的增加有明显的下降,电镜照片显示混凝土中纤维表面被腐蚀,混凝土强度损失可能与玄武岩纤维耐碱性能不强有关.
Experiments were carried out to test the alkaline resistance properties of basalt fibers and their effects on the mechanical property of fiber reinforced concrete. Mass loss rates of fibers were weighed after being soaked at different aqueous alkali and at different temperatures respectively. Meanwhile, mechanical properties of basalt fiber reinforced concrete (BFRC) were tested with three different volume fractions of basalt fiber. Microphotographs of corroded fibers show that as alkalinity and curing temperature increase, the scaling of fiber appeares even worse. However, mechanical properties of BFRC at the early age are close to those of the reference while compressive strength and flexural strength of BFRC at 28 d are deeply lower than those of the reference. Microstructure images of basalt fiber in concrete appeare to be corroded seriously. The results show that instability of basalt fiber in alkaline solution may impact the mechanical property of BFRC.
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