杨露,张文清
YANG Lu,ZHANG Wen-qing

• 1:安徽理工大学安全科学与工程学院
• 2:煤矿安全高效开采省部共建教育部重点实验室

摘要(Abstract)：

为了研究聚丙烯纤维含量和长径比对混凝土劈裂强度以及分形维数的影响，首先通过在含钢混凝土中添加不同含量和长径比的聚丙烯纤维制作混杂纤维混凝土试样，再利用分离式霍普金森压杆对试样进行高应变率动态劈裂力学试验。实验以相同冲击气压(0.2 MPa)对直径65 mm,高35 mm的10组试件进行测试。研究结果表明：聚丙烯纤维体积掺量为0.05%、0.1%时，长径比在3 000～9 000区间，混杂纤维混凝土的动态劈裂强度与能耗随掺量和长径比的增加有明显上升；在掺量为0.15%时，混杂纤维混凝土的动态劈裂强度与能耗均有所降低。各实验组中混杂纤维混凝土的分形维数均在2.3～2.6之间且小于普通混凝土，说明混杂纤维的添加可使混凝土的韧性、阻裂性能提升。
To study the effect of polypropylene fiber content and aspect ratio on the splitting strength and fractal dimension of concrete, hybrid fiber concrete samples were made by adding polypropylene fiber with different content and aspect ratio to steel concrete. Then the split-Hopkinson pressure bar was used to carry out high strain rate dynamic splitting mechanics test on the sample. Ten groups of specimens with diameter 65 mm and high 35 mm were tested at the same impact pressure(0.2 MPa). The results show that when the volume content of polypropylene fibers is 0.05% and 0.1%, and the length-diameter ratio is in the range of 3 000～9 000, The dynamic splitting strength and energy consumption of hybrid fiber reinforced concrete increase obviously with the increase of content and aspect ratio. When the dosage is 0.15%, the dynamic splitting strength of the hybrid fiber concrete decreases. The fractal dimension of the hybrid fiber concrete in each experimental group is in 2.3～2.6, which is smaller than that of ordinary concrete, indicating that the addition of hybrid fiber can improve the toughening and crack resistance of concrete.

关键词(KeyWords)： 劈裂强度;分形维数;混杂纤维混凝土;分离式霍普金森压杆
splitting strength;fractal dimension;hybrid fiber reinforced concrete;split-Hopkinson pressure bar

Abstract:

Keywords:

基金项目(Foundation): 安徽省自然科学基金资助项目(1808085ME160);; 煤炭安全精准开采国家地方联合工程研究中心开放基金资助项目(EC2021017)

作者(Author): 杨露,张文清
YANG Lu,ZHANG Wen-qing

DOI: 10.19931/j.EB.20220150

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