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通过拉拔和四点弯曲试验研究了氯盐(NaCl)溶液作用下干湿循环次数、氯盐溶液浓度(质量分数)和短切纤维种类对纤维编织网增强混凝土(TRC)性能的影响.结果表明:在浓度为5.0%的氯盐溶液作用下,随着干湿循环次数的增加,TRC中纤维束与混凝土的界面性能呈现下降趋势,而TRC的抗弯强度有先提高后降低的趋势;在120次干湿循环作用下,随着氯盐溶液浓度的增加,纤维束与混凝土的界面黏结强度变化不大,而TRC的抗弯强度也呈现先升高后降低的趋势.掺加短切AR-glass纤维和PVA纤维均可提高纤维束与混凝土的界面性能及TRC的抗弯性能,且后者对TRC抗弯承载力的提高更为明显.
The effects of the number of wet-dry cycles, the concentration of chloride salt solution (mass fraction) and the types of chopped fibers on the properties of fiber-reinforced concrete (TRC) were studied by drawing and four-point bending test. Results It is shown that the interfacial properties of fiber bundles and concrete in TRC show a downward trend with the increase of the number of wet and dry cycles under the action of the chloride salt solution at a concentration of 5.0%, while the flexural strength of TRC first increases and then decreases. Under the action of 120 cycles of wetting and drying, the interfacial bonding strength of fiber bundles and concrete changed little with the increase of the concentration of chloride salt solution, but the flexural strength of TRC also increased firstly and then decreased. Both AR-glass fiber and PVA fiber can improve the interfacial properties of fiber bundles and concrete and the flexural properties of TRC, and the latter increase the flexural strength of TRC more obviously.