多尺寸聚丙烯纤维混凝土抗弯韧性试验研究
发布时间：2018-07-30 07:46
【摘要】：为研究多尺寸聚丙烯纤维混凝土的抗弯韧性,采用四点弯曲试验对30个长×宽×高为400 mm×100 mm×100 mm的聚丙烯纤维混凝土试件进行研究,得到纤维混凝土梁的荷载-挠度曲线。基于美国ASTM-C1399-98方法,研究不同尺寸聚丙烯纤维及其混杂纤维对混凝土抗弯韧性的影响。研究结果表明:在相同掺量条件下,直径越小、长度越短的聚丙烯细纤维对混凝土裂前抗弯韧性改善效果越好;聚丙烯粗纤维和多尺寸聚丙烯纤维对混凝土裂后抗弯韧性有较大改善,并且在裂后出现低应力应变硬化现象;在相同掺量条件下,多尺寸聚丙烯纤维对混凝土的抗弯韧性改善效果最好;相对于素混凝土剩余强度,单掺聚丙烯细纤维混凝土剩余强度提高1.53~2.53倍,单掺聚丙烯粗纤维混凝土提高5.58~8.88倍,多尺寸聚丙烯纤维混凝土提高7.76~10.82倍。
[Abstract]:In order to study the flexural toughness of multi-size polypropylene fiber reinforced concrete, 30 polypropylene fiber reinforced concrete specimens with length 脳 width 脳 height of 400 mm 脳 100 mm were studied by four-point bending test. The load-deflection curves of fiber reinforced concrete beams were obtained. Based on American ASTM-C1399-98 method, the influence of polypropylene fiber and hybrid fiber on flexural toughness of concrete was studied. The results show that the smaller the diameter and the shorter the length of polypropylene fine fiber, the better the effect of improving the flexural toughness of concrete before crack. The flexural toughness of concrete after cracking is greatly improved by polypropylene coarse fiber and multi-size polypropylene fiber, and the phenomenon of low stress-strain hardening occurs after crack. Compared with the residual strength of plain concrete, the residual strength of pure polypropylene fine fiber concrete is increased by 1.53 ~ 2.53 times, and that of pure polypropylene coarse fiber concrete is increased by 5.58 ~ 8.88 times. The multi-size polypropylene fiber reinforced concrete was increased by 7.76 ~ 10.82 times.
【作者单位】： 重庆大学土木工程学院山地城镇建设与新技术教育部重点实验室(重庆大学);
【基金】：国家自然科学基金资助项目(41372356) 中央高校基本科研业务费专项基金资助项目(106112015CDJXY200007) 重庆市研究生科研创新项目(CYS16005)~~
【分类号】：TU528.572
本文编号：2154321
[Abstract]:In order to study the flexural toughness of multi-size polypropylene fiber reinforced concrete, 30 polypropylene fiber reinforced concrete specimens with length 脳 width 脳 height of 400 mm 脳 100 mm were studied by four-point bending test. The load-deflection curves of fiber reinforced concrete beams were obtained. Based on American ASTM-C1399-98 method, the influence of polypropylene fiber and hybrid fiber on flexural toughness of concrete was studied. The results show that the smaller the diameter and the shorter the length of polypropylene fine fiber, the better the effect of improving the flexural toughness of concrete before crack. The flexural toughness of concrete after cracking is greatly improved by polypropylene coarse fiber and multi-size polypropylene fiber, and the phenomenon of low stress-strain hardening occurs after crack. Compared with the residual strength of plain concrete, the residual strength of pure polypropylene fine fiber concrete is increased by 1.53 ~ 2.53 times, and that of pure polypropylene coarse fiber concrete is increased by 5.58 ~ 8.88 times. The multi-size polypropylene fiber reinforced concrete was increased by 7.76 ~ 10.82 times.
【作者单位】： 重庆大学土木工程学院山地城镇建设与新技术教育部重点实验室(重庆大学);
【基金】：国家自然科学基金资助项目(41372356) 中央高校基本科研业务费专项基金资助项目(106112015CDJXY200007) 重庆市研究生科研创新项目(CYS16005)~~
【分类号】：TU528.572
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