| 摘要: |
| 为提高混凝土的抗冻性及促进工业废料的应用，利用快冻法对混凝土试件进行冻融试验，测试冻融前后试件的相对动弹性模量（Er）和抗压强度，研究单掺玄武岩纤维束（BMF）、双掺短切玄武岩纤维（CBF）和BMF以及在双掺的较优配比基础上继续掺加硫酸钙晶须（CSW）对高强混凝土抗冻性能的影响.结果表明：素高强混凝土（PC）在经历150次冻融循环后的Er值为52.4%，视为冻融破坏；单掺、双掺和三掺均提高了高强混凝土的抗冻性，三掺的效果最好；当BMF体积分数为0.30%、CBF掺量为0.15%、CSW掺量为水泥质量的3%时，高强混凝土试件（CSW3CBF0.15BMF0.3）的抗冻性最佳，经历300次冻融循环后的Er值为86.6%，仍未冻融破坏；试件CSW3CBF0.15BMF0.3在经历150次冻融循环后的抗压强度损失率仅为2.5%，远低于PC（30.9%）；CSW、CBF和BMF发挥混掺效应，多尺度阻止了高强混凝土的冻胀开裂. |
| 关键词: 玄武岩纤维束 短切玄武岩纤维 硫酸钙晶须 混掺纤维 高强混凝土 抗冻性能 |
| DOI：10.3969/j.issn.1007-9629.2023.10.004 |
| 分类号:TU528.572 |
| 基金项目:交通部重点研发项目（2018-MS5-136）；河南省交通运输行业重点科技项目（2018J2，2019J-2-10） |
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| Freezing Resistance of Hybrid Fiber/Bundle High Strength Concrete |
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LI Chenchen1, MA Jiao1, ZHANG Pu1, ZHANG Dong2, SHAO Jinggan3
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1.College of Civil Engineering， Zhengzhou University， Zhengzhou 450001， China;2.College of Civil Engineering， Fuzhou University， Fuzhou 350108， China;3.Henan Communications Engineering Technology Group Co.， Ltd.， Zhengzhou 450015， China
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| Abstract: |
| To improve the freezing resistance of high strength concrete and expand the application of industrial waste， the freeze-thaw test of concrete specimens was carried out by rapid freeze-thaw method， the relative dynamic modulus of elasticity（Er） and compressive strength of the specimens before and after freeze-thaw were acquired， the effects of single basalt macro-fibers （BMF）， double mixed chopped basalt fibers （CBF） and BMF and calcium sulfate whiskers （CSW） on the freezing resistance of high strength concrete were studied. The results show that freeze-thaw failure occurs during 150 cycles for plain high strength concrete （PC）， and Er value is 52.4%. Single BMF， double mixed CBF and BMF and adding them all can improve the freezing resistance of high strength concrete， and adding them all in the concrete can get the best effect. The freezing resistance of high strength concrete is the best when the volume fraction of BMF is 0.30%， the volume fraction of CBF is 0.15% and the mass fraction of CSW is 3%（CSW3CBF0.15BMF0.3）， Er value is 86.6% after 300 freeze-thaw cycles. Loss ratio of compressive strength is only 2.5% for specimen CSW3CBF0.15BMF0.3 after 150 cycles， but is 30.9% for PC. CSW， CBF and BMF play a mixing effect and prevent freeze swelling cracking of high strength concrete in multi-scale. |
| Key words: basalt macro-fiber chopped basalt fiber calcium sulfate whisker hybrid fiber high strength concrete freezing resistance |
