【摘要】：為研究多尺寸聚丙烯纖維混凝土的抗彎韌性,采用四點(diǎn)彎曲試驗(yàn)對(duì)30個(gè)長(zhǎng)×寬×高為400 mm×100 mm×100 mm的聚丙烯纖維混凝土試件進(jìn)行研究,得到纖維混凝土梁的荷載-撓度曲線�；诿绹�(guó)ASTM-C1399-98方法,研究不同尺寸聚丙烯纖維及其混雜纖維對(duì)混凝土抗彎韌性的影響。研究結(jié)果表明:在相同摻量條件下,直徑越小、長(zhǎng)度越短的聚丙烯細(xì)纖維對(duì)混凝土裂前抗彎韌性改善效果越好;聚丙烯粗纖維和多尺寸聚丙烯纖維對(duì)混凝土裂后抗彎韌性有較大改善,并且在裂后出現(xiàn)低應(yīng)力應(yīng)變硬化現(xiàn)象;在相同摻量條件下,多尺寸聚丙烯纖維對(duì)混凝土的抗彎韌性改善效果最好;相對(duì)于素混凝土剩余強(qiáng)度,單摻聚丙烯細(xì)纖維混凝土剩余強(qiáng)度提高1.53~2.53倍,單摻聚丙烯粗纖維混凝土提高5.58~8.88倍,多尺寸聚丙烯纖維混凝土提高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.
【作者單位】： 重慶大學(xué)土木工程學(xué)院山地城鎮(zhèn)建設(shè)與新技術(shù)教育部重點(diǎn)實(shí)驗(yàn)室(重慶大學(xué));
【基金】：國(guó)家自然科學(xué)基金資助項(xiàng)目(41372356) 中央高�；究蒲袠I(yè)務(wù)費(fèi)專(zhuān)項(xiàng)基金資助項(xiàng)目(106112015CDJXY200007) 重慶市研究生科研創(chuàng)新項(xiàng)目(CYS16005)~~
【分類(lèi)號(hào)】：TU528.572

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