聚丙烯纤维混凝土单轴受压损伤机理研究
Research on Uniaxial Compression Damage Mechanism of Polypropylene Fiber Reinforced Concrete[J].
浏览量:
关键词：
聚丙烯纤维混凝土；单轴受压；应力-应变全曲线；声发射；损伤机理
Key words：
Polypropylene Fiber Reinforced Concrete; Uniaxial Compression; Stress-strain Curve; Acoustic Emission (AE); Damage Mechanism
刊期：
２０18年第2期
DOI：
文章编号：
1000-4637(2018)02-55-06
基金项目：
作者：
黄俊男1，颜燕祥2
单位：
1.湖北工程学院国际教育学院，孝感 432000；2. 湖北工程学院土木工程学院，孝感 432000
摘要
摘 要：考虑聚丙烯纤维体积掺量和长径比两因素，设计制作了7组混凝土试件，通过单轴受压应力-应变全曲线试验，研究了聚丙烯纤维对混凝土力学行为的影响。采用声发射信号采集系统同步监测混凝土内部损伤演化过程，分析了聚丙烯纤维混凝土单轴受压损伤机理。结果表明，聚丙烯纤维显著改善了混凝土的峰后延性和抗压韧性。混凝土试件贯通裂缝形成时，声发射撞击数突增，应力迅速下降，损伤发展较快。随着纤维体积掺量增加，试件声发射累计撞击数逐渐增大；纤维长径比为280时，声发射累计撞击数最大。聚丙烯纤维混凝土破坏时剪切裂纹所占裂纹总数比重较大，试件呈现剪切破坏形态。
Abstract: A total of 7 group of concrete specimens for different fiber volume fractions and aspect ratios was fabricated and tested. Based on the stress-strain curve under uniaxial loading, the effects of PF(polypropylene fiber) on the stress-strain behavior of concrete were studied. The damage evolution process was monitored by acoustic emission (AE) signal acquisition system, and the compressive damage mechanism was analyzed based on AE parameters. The results indicate that the post-peak ductility and compressive toughness are improved by addition of PF. Results from AE showe that the AE hits hare a concentrated release when the main cracks of specimen are formed with a sharp drop in axial stress. Moreover, the cumulative AE hits increase with the increasing fiber volume fraction, and can reache the biggest for the fiber aspect ratio of 280. Furthermore, the mass ratio of shear cracks to the total increases by the incorporation of polypropylene fibers and the specimen showe an obvious shearing failure mode.
结论
（1）聚丙烯纤维混凝土破坏呈现明显的延性特征。聚丙烯纤维混凝土单轴受压全过程可分为五个阶段：弹性受力阶段、细观裂缝扩展阶段、宏观裂纹扩展段、裂缝失稳扩展段和破坏段。
（2）聚丙烯纤维的掺入可以显著改善混凝土的受压力学性能，提高其极限应变，增强其抗压韧性和峰后延性。
（3）混凝土损伤过程与声发射信号特征密切相关。在贯通裂缝形成时，试件声发射撞击数突增，混凝土强度迅速下降，损伤发展较快。聚丙烯纤维混凝土贯通裂缝形成时间晚于普通混凝土。与普通混凝土相比，由于纤维的滑移和拔出，聚丙烯纤维混凝土累计声发射撞击数较高，且随纤维体积掺量增加而增加，长径比为280时，声发射累计撞击数达到最大值。
（4）随着聚丙烯纤维的掺入，混凝土中剪切裂缝所占比重增大，混凝土破坏由受拉裂缝控制向剪切裂纹控制转变。
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引用本文
黄俊男,颜燕祥.聚丙烯纤维混凝土单轴受压损伤机理研究[J].混凝土与水泥制品,2018(2):55-60.
RHUANG J N,YAN Y X.Research on Uniaxial Compression Damage Mechanism of Polypropylene Fiber Reinforced Concrete[J].China Concrete and Cement Products,2018(2):55-60.
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