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首页 > 过刊浏览>2023年第26卷第10期 >1072-1081. DOI:10.3969/j.issn.1007-9629.2023.10.004
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混杂纤维/束高强混凝土的抗冻性
作者:
作者单位:

1.郑州大学 土木工程学院，河南 郑州 450001;2.福州大学 土木工程学院， 福建 福州 350108;3.河南交院工程技术集团有限公司，河南 郑州 450015

作者简介:

李趁趁（1977—），女，河南济源人，郑州大学副教授，硕士生导师，博士. E-mail： lcc0506@zzu.edu.cn

通讯作者:

张 普（1982—），男，河南周口人，郑州大学教授，博士生导师，博士. E-mail： zhpu@zzu.edu.cn

中图分类号:

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）


Freezing Resistance of Hybrid Fiber/Bundle High Strength Concrete
Author:
Affiliation:

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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    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.

    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.

    表 4 硫酸钙晶须的物理力学性能Table 4 Physical and mechanical properties of calcium sulfate whisker
    表 2 粗骨料的级配组成Table 2 Gradation of coarse aggregates
    表 6 单掺玄武岩纤维束混凝土的配合比Table 6 Mix proportions of single basalt macro-fibers concretes
    表 8 三掺短切玄武岩纤维、玄武岩纤维束和硫酸钙晶须混凝土的配合比Table 8 Mix proportions of concretes with chopped basalt fiber， basalt macro-fibers and calcium sulfate whiskers
    表 5 水泥和硫酸钙晶须的化学组成Table 5 Chemical compositions of cement and calcium sulfate whisker
    表 1 细骨料的级配组成Table 1 Gradation of fine aggregates
    表 3 单丝玄武岩纤维的物理力学性能Table 3 Physical and mechanical properties of single basalt fiber
    图1 水泥的粒径分布Fig.1 Size distribution of cement particles
    图2 玄武岩纤维束与短切玄武岩纤维的外观Fig.2 Morphology of basalt macro-fibers and chopped basalt fibers
    图3 硫酸钙晶须的形貌Fig.3 Morphology of calcium sulfate whiskers
    图4 单掺BMF对高强混凝土相对动弹性模量的影响Fig.4 Effect of BMF on relative dynamic elastic modulus of high strength concrete
    图5 混杂玄武岩纤维/束掺量对相对动弹性模量的影响Fig.5 Effect of hybrid basalt fiber/bundle content on relative dynamic elastic modulus
    图6 三掺短切玄武岩纤维、玄武岩纤维束和硫酸钙晶须高强混凝土的相对动弹性模量Fig.6 Relative dynamic elastic modulus of high strength concretes with chopped basalt fibers， basalt macro-fibers and calcium sulfate whiskers
    图7 单掺BMF对高强混凝土抗压强度损失率的影响Fig.7 Effect of single BMF on LR of high strength concretes
    图8 CBF/BMFRC冻融循环150次后的抗压强度损失率Fig.8 LR of hybrid CBF and BMF high strength concretes after 150 freeze-thaw cycles
    图9 CSW/CBF/BMFRC冻融循环150次后的抗压强度损失率Fig.9 LR of high strength concrete with CBF， BMF and CSW after 150 freeze-thaw cycles
    图10 试件CSW2CBF0.15BMF0.3冻融循环前后的微观结构Fig.10 Microstructure of specimen CSW2CBF0.15BMF0.3 before and after freeze-thaw cycles
    表 7 双掺短切玄武岩纤维和玄武岩纤维束混凝土的配合比Table 7 Mix proportions of concretes with chopped basalt fibers and basalt macro-fibers
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李趁趁,马娇,张普,张冬,邵景干.混杂纤维/束高强混凝土的抗冻性[J].建筑材料学报,2023,26(10):1072-1081

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  • 收稿日期:2022-12-12
  • 最后修改日期:2023-02-17
  • 在线发布日期: 2023-11-14
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