混杂纤维自密实混凝土冻融性能试验研究_《混凝土与水泥制品》杂志社

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发布时间：2020-01-06 00:00:00

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混杂纤维自密实混凝土冻融性能试验研究

Experimental Study on Freeze-thaw Performance of Hybrid Fiber Reinforced Self-compacting Concrete

2020年第十一期

冻融循环；混杂纤维；自密实混凝土；工作性；力学性能；混杂效应

Freeze-thaw cycle; Hybrid fiber; Self-compacting concrete; Workability; Mechanical propery; Hybrid effect

2020年第十一期

10.19761/j.1000-4637.2020.11.052.05

甘肃省重点研发计划项目（17YF1FM148）。

吕圆芳，杨永东

陇东学院土木工程学院，甘肃庆阳745000

吕圆芳，杨永东

吕圆芳,杨永东.混杂纤维自密实混凝土冻融性能试验研究[J].混凝土与水泥制品,2020(11):52-56.

LYU Y F,YANG Y D.Experimental Study on Freeze-thaw Performance of Hybrid Fiber Reinforced Self-compacting Concrete[J].CHINA CONCRETE AND CEMENT PRODUCTS,2020(11):52-56.

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摘要：研究了PP纤维、镀铜钢纤维和钢-PP混杂纤维对自密实混凝土工作性及冻融前后力学性能的影响，并探讨了冻融作用对纤维混杂增强效应系数的影响。结果表明：PP纤维对自密实混凝土工作性的影响大于钢纤维；未掺纤维的空白组经300次冻融后，其质量损失率及相对动弹性模量损失分别达到4.23%、34.8%，表观质量劣化严重；冻融作用对试件抗折强度影响最大，其次是动弹性模量和抗压强度；纤维的掺入能有效提高混凝土的抗冻性能，但钢纤维对表观质量的改善作用小于PP纤维；混杂纤维抗冻融能力明显高于单掺纤维组和空白组，纤维混杂增强效应随冻融循环次数的增加而降低。 Abstract: The effects of polypropylene fiber(PP), ultrafine steel fiber and steel-PP hybrid fiber on the workability and mechanical properties of self compacting concrete(SCC) before and after freeze-thaw were studied, and the influence of freeze-thaw on fiber hybrid reinforcement effect coefficient was discussed. The results show that PP fiber has greater influence on the workability of SCC than steel fiber. After 300 freeze-thaw cycles, the mass loss rate and relative dynamic elastic modulus loss of the SCC without fiber reach 4.23% and 34.8%, respectively, and the apparent quality deteriorate seriously. The freeze-thaw effect has the greatest influence on the flexural strength of the specimen, followed by the dynamic elastic modulus and compressive strength. The addition of fiber can effectively improve the frost resistance of SCC, but the improvement effect of steel fiber on the apparent quality is less than that of PP fiber. The freeze-thaw resistance of the hybrid fiber specimens is significantly higher than that of the single-blend fiber group and the blank group, and the fiber hybrid reinforcement effect coefficient decreases with the increase of freeze-thaw cycles.

英文名 : Experimental Study on Freeze-thaw Performance of Hybrid Fiber Reinforced Self-compacting Concrete

刊期 : 2020年第十一期

关键词 : 冻融循环；混杂纤维；自密实混凝土；工作性；力学性能；混杂效应

Key words : Freeze-thaw cycle; Hybrid fiber; Self-compacting concrete; Workability; Mechanical propery; Hybrid effect

刊期 : 2020年第十一期

DOI : 10.19761/j.1000-4637.2020.11.052.05

文章编号 :

基金项目 : 甘肃省重点研发计划项目（17YF1FM148）。

作者 : 吕圆芳，杨永东

单位 : 陇东学院土木工程学院，甘肃庆阳745000

吕圆芳，杨永东

吕圆芳,杨永东.混杂纤维自密实混凝土冻融性能试验研究[J].混凝土与水泥制品,2020(11):52-56.

LYU Y F,YANG Y D.Experimental Study on Freeze-thaw Performance of Hybrid Fiber Reinforced Self-compacting Concrete[J].CHINA CONCRETE AND CEMENT PRODUCTS,2020(11):52-56.

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摘要

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结论

参考文献

引用本文

Abstract: The effects of polypropylene fiber(PP), ultrafine steel fiber and steel-PP hybrid fiber on the workability and mechanical properties of self compacting concrete(SCC) before and after freeze-thaw were studied, and the influence of freeze-thaw on fiber hybrid reinforcement effect coefficient was discussed. The results show that PP fiber has greater influence on the workability of SCC than steel fiber. After 300 freeze-thaw cycles, the mass loss rate and relative dynamic elastic modulus loss of the SCC without fiber reach 4.23% and 34.8%, respectively, and the apparent quality deteriorate seriously. The freeze-thaw effect has the greatest influence on the flexural strength of the specimen, followed by the dynamic elastic modulus and compressive strength. The addition of fiber can effectively improve the frost resistance of SCC, but the improvement effect of steel fiber on the apparent quality is less than that of PP fiber. The freeze-thaw resistance of the hybrid fiber specimens is significantly higher than that of the single-blend fiber group and the blank group, and the fiber hybrid reinforcement effect coefficient decreases with the increase of freeze-thaw cycles.

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