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工程科学与技术:2016,48(2):225-230
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不同亲水性能的纤维对混凝土抗冻耐久性的影响
(1.四川大学 能源工程安全与灾害力学教育部重点实验室;2.四川大学 新能源与低碳技术研究院;3.四川省交通勘察设计研究院)
Influence of Fiber Hydrophilic to Improve the Frost Resistance of Concrete
(1.Key Lab.of Energy Eng.Safety and Disaster Mechanics for Ministry of Education,Sichuan Univ.;2.Inst.of New Energy and Lowcarbon Technol.,Sichuan Univ.;3.Sichuan Communication Surveying & Design Inst.)
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投稿时间:2015-05-21    修订日期:2015-11-26
中文摘要: 为了研究不同亲水性能的纤维对混凝土抗冻性能的影响规律,选择3种不同回潮率的纤维,采用快冻法对纤维混凝土的抗冻耐久性进行试验研究;分析不同纤维混凝土的冻融损伤规律,以及回潮率对其冻融损伤的影响。利用SEM对冻融前后纤维-水泥石基体进行了观测,进一步探讨纤维亲水性对混凝土抗冻性能的影响机理。结果表明,亲水性良好的纤维能够与水泥石更好的共同作用,有效抑制混凝土内部初期微缺陷及冻融过程中微缺陷的生长;而疏水性纤维难以与水泥石难以形成有效的共同作用体系,对于冻融循环过程中微缺陷的生长抑制能力较弱,其纤维-水泥石之间的薄弱带甚至可能会加速混凝土的冻融损伤;且随着冻融循环次数的增加,纤维的亲水性对混凝土的抗冻性能影响愈加明显。
中文关键词: 亲水性  疏水性  冻融  回潮率  纤维混凝土
Abstract:Three kinds of fibers with different rate of moisture regain were selected to study the effect of hydrophilism of fibers on the durability of fiber reinforced concrete during freeze-thaw with the rapid freeze-thaw cycle experiment.Microstructure of fiber-cement matrix were observed using SEM before and after freeze-thaw.The results showed that compared with the hydrophobic fibers,since the latter can be tightly bonded with cement matrix together hydrophilic fibers can effectively inhibit the initial micro-defects of concrete and prevent the growth of micro-defects in the freeze-thaw cycles.Therefore,hydrophobic fiber concrete may even accelerate the growth of damage during freeze-thaw cycles,due to the interfacial performance between fibers and concrete is weak.With the increase of freeze-thaw cycles,the impact on frost resistance of concrete by the hydrophilic of fibers became more and more obvious.
文章编号:201500488     中图分类号:    文献标志码:
基金项目:四川交通科技资助项目(2011c15_2_2)
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何柏,谢凌志,刘泉,张生.不同亲水性能的纤维对混凝土抗冻耐久性的影响[J].工程科学与技术,2016,48(2):225-230.
HE Bo,XIE Lingzhi,LIU Quan,ZHANG Sheng.Influence of Fiber Hydrophilic to Improve the Frost Resistance of Concrete[J].Advanced Engineering Sciences,2016,48(2):225-230.