高锆耐碱玻璃纤维混凝土弯曲疲劳特性试验研究

Risk Matrix Research on the Bending Fatigue Properties of Concrete with Alkali-resistant Glass Fiber of High Zirconium

为了掌握高锆耐碱玻璃纤维对混凝土疲劳性能的改善效果,研究了不同应力水平、不同体积掺率的高锆耐碱玻璃纤维混凝土的弯曲疲劳特性。对比了高锆耐碱玻璃纤维与钢纤维、粗聚丙烯纤维增强混凝土弯曲疲劳寿命的差异。试验结果表明：在低应力水平为0.63时,体积掺率分别为0.25%、0.45%和0.75%的高锆耐碱玻璃纤维混凝土GF25、GF45和GF75的疲劳寿命比素混凝土分别提高了68%、171%和243%;中等应力水平0.67时,GF25、GF45和GF75的疲劳寿命比素混凝土分别提高了59%、154%和209%;较高应力水平为0.70时,GF25、GF45和GF75的疲劳寿命比素混凝土分别提高了53%、76%和115%。当中等应力水平为0.67时,GF75的疲劳寿命比同体积掺率为0.75%的粗聚丙烯纤维混凝土PPF75提高了130%,GF45的疲劳寿命比同体积掺率为0.45%的钢纤维混凝土SF45提高了104%。可见掺加了高锆耐碱玻璃纤维显著改善了混凝土的疲劳性能;在中等应力水平、同体积掺率下,高锆耐碱玻璃纤维对混凝土弯曲疲劳性能的改善效果优于钢纤维与粗聚丙烯纤维。

In order to master on the fatigue per Alkali-- resistant formance of co glass fiber nc hi the improvement effect of Alkali resistant glass fiber of high zirconium rete, the bending fatigue properties of concrete with different volume of gh zirconium at different stress levels are studied systematically. The fatigue properties of Alkali-resistant glass fiber of high zirconium reinforced concrete and steel fiber reinforced concrete and coarse polypropylene fiber reinforced concrete are compared. The experimental results show that at the low stress level of 0. 63, the fatigue life of the GF25, GF45 and GF75 of the Alkali-resistant glass fiber of high zirconium reinforced concrete with the volume fraction of 0. 25%, 0.45% and 0.75% respectively increases by 68%, 171% and 243% compared with plain concrete. At the middle stress level of 0.67, the fatigue life of GF25, GF45 and GF75 increases by 59%, 154% and 209% compared with plain concrete respectively. At higher stress level of 0.70, the fatigue life of GF25, GF45 and GF75 is increased by 53%, 76% and 115% compared with plain concrete, respectively. In the middle level, the fatigue life of GF75 is higher than that of coarse polypropylene fiber concrete PPF75 of 130% with the same volume fraction of 0. 75%. The fatigue life of GF45 is 104% higher than that of steel fiber concrete with the same volume fraction of 0.45%. It can be seen that the adding of Alkali resistant glass fiber of high zirconium significantly improves the fatigue properties of concrete; under the condition of middle stress level and the same volume fraction, the effect of Alkali resistant glass fiber of high zirconium on the bending fatigue performance of concrete is better than that of steel fiber and coarse polypropylene fiber.