不同纤维对混凝土在多重因素作用下抗冻耐久性的影响

宁喜亮; 王万平; 郝帅; 赵子舜; 张发山

doi:10.13204/j.gyjzG19110401

不同纤维对混凝土在多重因素作用下抗冻耐久性的影响

doi: 10.13204/j.gyjzG19110401

1. 东北电力大学建筑工程学院, 吉林吉林 132012;
2. 绿色建筑材料国家重点实验室, 北京 100024;
3. 江苏方洋能源科技有限公司, 江苏连云港 222000;
4. 国网宜宾供电公司, 四川宜宾 644000;
5. 中国冶金地质总局山东局蒙古正元有限责任公司, 济南 250013

基金项目:

国家自然科学基金项目（51608100）；吉林省科技厅优秀青年人才基金项目（20190103048JH）；吉林省教育厅科技项目（JJKH20180423KJ）；绿色建筑材料国家重点实验室开放基金项目（YA-589）。

详细信息

作者简介:
宁喜亮,男,1984年出生,博士,副教授,硕士研究生导师。电子信箱:ning-tony@163.com

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出版历程
- 收稿日期: 2020-06-04

EFFECT OF DIFFERENT FIBERS ON FROST RESISTANCE OF CONCRETE UNDER MULTIPLE FACTORS

1. School of Architecture and Civil Engineering, Northeast Electric Power University, Jilin 132012, China;
2. State Key Laboratory of Green Building Materials, Bejing 100024, China;
3. JS Fangyang Energy Science and Technology Ltd., Lianyungang 222000, China;
4. State Grid Yibin Electric Power Company, Yibin 644000, China;
5. Mongolia Zhengyuan Co., Ltd., Shandong Bureau of China Metallurgical Geology Bureau, Jinan 250013, China

摘要

摘要: 为探究钢纤维与聚丙烯纤维在冻融及荷载作用下混凝土的抗冻耐久性，以冻融介质、纤维种类及掺量和荷载为变量，通过快速冻融法对纤维混凝土的相对弹性模量、质量损失、抗压强度、抗折强度和弯曲韧性进行测定。结果表明：损伤程度由大到小排序为：荷载+氯盐+冻融耦合作用、氯盐+冻融耦合作用、单一冻融循环作用；掺加纤维能减轻混凝土的损伤，聚丙烯纤维较钢纤维更能减缓混凝土在不同因素冻融循环后的质量损失和相对弹性模量的下降，钢纤维能有效改善不同因素作用下混凝土强度的损失；钢纤维掺量为40 kg/m³时，可显著改善水冻融循环作用后混凝土的抗压和抗折强度损失，并能显著提高混凝土在荷载+氯盐+冻融多重因素耦合作用下的弯曲韧性；钢纤维在强度方面起到的改善作用优于聚丙烯纤维。
- 钢纤维 /
- 聚丙烯纤维 /
- 冻融循环 /
- 盐溶液 /
- 弯曲荷载 /
- 耐久性
Abstract: In order to study the effect of steel fibers and polypropylene fibers on frost resistance of concrete under different environmental conditions, freeze-thaw media, fiber types, fiber contents and acted loads were chosen as variables. Based on the rapid freezing and thawing, the relative elastic modulus, mass loss, compressive strength, flexural strength and bending toughness of fiber reinforced concrete were determined. The results showed that the damage degree of concrete under different factors was ranked from large to small as:loads + chloride + freeze-thaw effect, chloride + freeze-thaw effect, and single freeze-thaw cycle effect, and mixing fibers could reduce freeze-thaw damage effectively. In the case of water freezing and salt freezing, the inclusion of polypropylene fiber could reduce the mass loss and the relative elastic modulus of concrete significantly. Adding 40 kg/m³ steel fibers into concrete matrices could improve the compressive strength and flexural strength after freeze and thaw cycles and improve the flexural toughness of concrete under combined action of loads, chloride salt and freeze-thaw cycles greatly, steel fibers could play a more important role in improving the mechanical properties than polypropylene fibers.
- steel fiber /
- polypropylene fiber /
- freeze-thaw cycle /
- salt solution /
- bending load /
- durability

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参考文献(21)

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