高延性纤维增强水泥基复合材料力学性能试验研究

发布时间：2018-03-29 16:16

本文选题：ECC　切入点：PVA　出处：《工业建筑》2017年06期

【摘要】：高延性纤维增强水泥基复合材料(ECC)是一种高韧性延性土木工程材料,通过对13组288个ECC试件进行单轴抗压、劈裂抗拉及四点弯曲等试验,分析聚乙烯醇纤维(PVA)掺量、水胶比及粉煤灰掺量对ECC力学性能的影响规律。研究表明:水胶比及粉煤灰掺量是影响其抗压强度的主要因素,增加PVA掺量,ECC抗压强度变化较小,峰值应变值及极限应变值明显提高,峰值后延性较好;随着水胶比增加,ECC抗拉强度及抗弯强度降低,增加PVA掺量可明显提高抗拉及抗弯强度,PVA掺量为2.0%的ECC抗拉强度较基体提高53%,抗弯强度及弯曲韧度系数分别是相应基体的2.8倍及7倍,ECC在各种破坏荷载作用下可保持良好的整体性,未发生脆性破坏。
[Abstract]:High ductile fiber reinforced cement matrix composite (Ecc) is a kind of high toughness ductile civil engineering material. Through uniaxial compression, splitting tensile and four point bending tests on 13 groups of 288 ECC specimens, the content of polyvinyl alcohol fiber (PVA) was analyzed. The effect of water binder ratio and fly ash content on the mechanical properties of ECC is studied. The results show that the ratio of water to binder and the content of fly ash are the main factors affecting the compressive strength of ECC, and the increase of PVA content has little effect on the compressive strength of ECC. The peak strain value and limit strain value are obviously increased, and the peak elongation is better, and the tensile strength and bending strength of ECC decrease with the increase of water-binder ratio. The tensile strength and flexural strength of ECC containing 2.0% PVA can be increased by 53% than that of the matrix. The flexural strength and bending toughness coefficient are 2.8 times and 7 times of the corresponding matrix respectively under various failure loads. Maintain good integrity, No brittle failure occurred.
【作者单位】：长安大学建筑工程学院;
【基金】：国家自然科学基金项目(51208058) 陕西省自然科学基金项目(2014JM7294) 陕西省协同创新计划项目(2015XT-38) 中央高校基本科研业务费(2013G2281016)
【分类号】：TU528

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