纤维对GFRP筋与自密实混凝土基体粘结性能影响
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摘要
侵蚀环境下,用玻璃纤维增强聚合物(GFRF)筋替代混凝土结构中的钢筋,可作为一种有效的解决钢筋锈蚀的方法。由于GFRF筋与钢筋在制作和力学性能上存在本质的不同,将其应用于混凝土构件中存在的主要问题之一是与混凝土基体粘结性能不足。GFRF筋与混凝土基体良好的粘结性能是两者协同工作的基础,改善GFRF筋与混凝土基体粘结性能对GFRF筋的实际应用具有重要意义。
自密实混凝土由于其良好的流动性、填充性和抗离析性,能保证混凝土与GFRF筋之间良好的粘结性能,增强基体与GFRF筋之间的握裹力。将纤维掺入混凝土中能明显改善混凝土性能,乱向分布的结构型钢纤维可阻滞混凝土内部微裂缝的扩展、限制宏观裂缝发展以及提高构件开裂后的韧性;传统聚丙烯短纤维通常用于阻止混凝土的早期塑性开裂;增韧增强型聚丙烯长纤维既可在早期提高混凝土的抗裂性,也能明显改善硬化混凝土的韧性和抗裂性,但在混凝土中掺入纤维后对GFRF筋与混凝土基体粘结性能的影响还不明了。
在保证新拌自密实混凝土优良的工作性能和硬化后的力学性能的前提下,本文通过拉拔和梁式试验,主要研究不同结构型纤维(钢纤维,聚丙烯长纤维)、抵抗收缩裂缝为主的聚丙烯短纤维以及不同纤维掺量对GFRF筋与混凝土基体粘结性能的影响,旨在找寻改善GFRF筋与混凝土基体粘结性能的有效途径。并参照德国纤维混凝土标准DBV和国际材料与结构研究试验联合会标准RILEM弯曲韧性评价方法,提出了一种评价粘结延性的新方法。结果表明,短纤维对粘结强度有所降低;钢纤维与聚丙烯纤维的适量混杂以及长纤维均既可提高粘结强度,还可改善粘结延性;GFRF筋与基体的粘结强度随钢纤维掺量增大而提高。
最后,在本文试验以及已有试验研究的基础上,对粘结滑移曲线上升段进行了拟合,模型曲线与试验曲线吻合良好;并综合考虑GFRF筋的表面特性、试件浇注方向等因素提出了GFRP筋粘结强度理论公式和锚固长度设计建议,为有关规范的编制提供了依据。
One of the effective ways to avoid the problem of corrosion of steel reinforcement in concrete is to use fiber reinforced polymer (FRP) reinforcing bars as alternative. Because of the differences between FRP bar and steel bar in the production technique and mechanical properties, the bond stress of FRP bar embedded in concrete is not as good as steel bar embedded. Good bond behavior between FRP bars and concrete is a fundamental issue for reinforced concrete, and it is meaningful for the application of FRP bar in the civil engineering to improve the bond performance of FRP bar and concrete.
Self-compacting concrete (SCC) have good workability such as fluidity, ability of filling and ability of resistance to segregation, which can enhance the bond strength of FRP bar embedded in concrete and strengthen the grasp force between FRP bar and concrete. Adding fibers to concrete can improve the performance of concrete: unorderly distribution of structural steel fibers can retard the extension of interior microcracks, and limit the development of macroscopical cracks, and enhance the toughness after concrete members cracking; traditional micro PP-fiber can prevent the early plastic cracking of concrete; macro PP-fiber can not only enhance the early cracking resistance behavior, but also improve significantly the toughness and the cracking resistance after concrete indurate. But it is still uncertain whether the adding fibers to concrete can enhance the bond strength of FRP bar embedded in concrete.
On the premise of ensuring the good workability and mechanical properties of self-compacting concrete, the influence of different type of fiber (steel fiber, macro PP-fiber and micro PP-fiber) and addition magnitude of fiber on the bond behavior between FRP bars and concrete are studied by pull-out test and beam test aiming at finding out an effective way of improving the bond behavior of FRP bar embedded in concrete. A new way of evaluating bond ductility is proposed according to the bend toughness evaluation measure of DBV and RILEM. The results show that adding micro PP-fibers to concrete will decrease the bond strength of FRP bar embedded in concrete to some extent; adding suitable hybrid of steel fiber and PP-fiber or macro fiber to concrete can both enhance the bond strength and improve the bond ductility; the bond strength between FRP bars and concrete will be enhanced with increasing of steel fiber content.
Finally based on the test results and former works, the ascending branch of the bond-slip curve is modeled, and the modeled curve corresponds with the test curve greatly; In addition, a new equation for bond strength and embedment length of GFRP rebar is proposed and provide principles for design code, which takes types of GFRP bars, position in the cast into consideration.
自密实混凝土由于其良好的流动性、填充性和抗离析性,能保证混凝土与GFRF筋之间良好的粘结性能,增强基体与GFRF筋之间的握裹力。将纤维掺入混凝土中能明显改善混凝土性能,乱向分布的结构型钢纤维可阻滞混凝土内部微裂缝的扩展、限制宏观裂缝发展以及提高构件开裂后的韧性;传统聚丙烯短纤维通常用于阻止混凝土的早期塑性开裂;增韧增强型聚丙烯长纤维既可在早期提高混凝土的抗裂性,也能明显改善硬化混凝土的韧性和抗裂性,但在混凝土中掺入纤维后对GFRF筋与混凝土基体粘结性能的影响还不明了。
在保证新拌自密实混凝土优良的工作性能和硬化后的力学性能的前提下,本文通过拉拔和梁式试验,主要研究不同结构型纤维(钢纤维,聚丙烯长纤维)、抵抗收缩裂缝为主的聚丙烯短纤维以及不同纤维掺量对GFRF筋与混凝土基体粘结性能的影响,旨在找寻改善GFRF筋与混凝土基体粘结性能的有效途径。并参照德国纤维混凝土标准DBV和国际材料与结构研究试验联合会标准RILEM弯曲韧性评价方法,提出了一种评价粘结延性的新方法。结果表明,短纤维对粘结强度有所降低;钢纤维与聚丙烯纤维的适量混杂以及长纤维均既可提高粘结强度,还可改善粘结延性;GFRF筋与基体的粘结强度随钢纤维掺量增大而提高。
最后,在本文试验以及已有试验研究的基础上,对粘结滑移曲线上升段进行了拟合,模型曲线与试验曲线吻合良好;并综合考虑GFRF筋的表面特性、试件浇注方向等因素提出了GFRP筋粘结强度理论公式和锚固长度设计建议,为有关规范的编制提供了依据。
One of the effective ways to avoid the problem of corrosion of steel reinforcement in concrete is to use fiber reinforced polymer (FRP) reinforcing bars as alternative. Because of the differences between FRP bar and steel bar in the production technique and mechanical properties, the bond stress of FRP bar embedded in concrete is not as good as steel bar embedded. Good bond behavior between FRP bars and concrete is a fundamental issue for reinforced concrete, and it is meaningful for the application of FRP bar in the civil engineering to improve the bond performance of FRP bar and concrete.
Self-compacting concrete (SCC) have good workability such as fluidity, ability of filling and ability of resistance to segregation, which can enhance the bond strength of FRP bar embedded in concrete and strengthen the grasp force between FRP bar and concrete. Adding fibers to concrete can improve the performance of concrete: unorderly distribution of structural steel fibers can retard the extension of interior microcracks, and limit the development of macroscopical cracks, and enhance the toughness after concrete members cracking; traditional micro PP-fiber can prevent the early plastic cracking of concrete; macro PP-fiber can not only enhance the early cracking resistance behavior, but also improve significantly the toughness and the cracking resistance after concrete indurate. But it is still uncertain whether the adding fibers to concrete can enhance the bond strength of FRP bar embedded in concrete.
On the premise of ensuring the good workability and mechanical properties of self-compacting concrete, the influence of different type of fiber (steel fiber, macro PP-fiber and micro PP-fiber) and addition magnitude of fiber on the bond behavior between FRP bars and concrete are studied by pull-out test and beam test aiming at finding out an effective way of improving the bond behavior of FRP bar embedded in concrete. A new way of evaluating bond ductility is proposed according to the bend toughness evaluation measure of DBV and RILEM. The results show that adding micro PP-fibers to concrete will decrease the bond strength of FRP bar embedded in concrete to some extent; adding suitable hybrid of steel fiber and PP-fiber or macro fiber to concrete can both enhance the bond strength and improve the bond ductility; the bond strength between FRP bars and concrete will be enhanced with increasing of steel fiber content.
Finally based on the test results and former works, the ascending branch of the bond-slip curve is modeled, and the modeled curve corresponds with the test curve greatly; In addition, a new equation for bond strength and embedment length of GFRP rebar is proposed and provide principles for design code, which takes types of GFRP bars, position in the cast into consideration.
引文
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