首页|硅灰和纤维直径对UHPC黏结性能的影响研究

硅灰和纤维直径对UHPC黏结性能的影响研究

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为探究钢纤维类型对超高性能混凝土(ultra-high performance concrete,UHPC)基体黏结性能的影响规律,以直圆型钢纤维直径(0.2、0.3 mm)和硅灰掺量为变量,开展了10组双丝拉拔试验.结果表明:随着硅灰掺量的增加,0.3 mm的直圆型钢纤维的拉拔荷载、拉拔功及黏结强度均呈现先增大后减小的趋势.在硅灰掺量为20%时,钢纤维的利用率达到峰值43%;在进一步分析硅灰掺量对直径为0.2 mm的直圆型钢纤维的影响时,其评价参数(如拉拔荷载、拉拔功及黏结强度)的变化规律与0.3 mm钢纤维的截然相反.虽然两种不同直径钢纤维的荷载-滑移曲线在趋势上呈现一定的相似性,但0.3 mm的直圆型钢纤维曲线较为饱满,并且存在较多波峰波谷.综上可得,钢纤维直径和硅灰掺量对UHPC基体的黏结性能均有较大影响,这一发现不仅深化了UHPC复合材料内部作用机制的研究,也为后续进一步优化UHPC基体的整体性能、探索其更广泛的应用领域提供了宝贵的参考依据.
Influence of silica fume and fiber diameter on bonding performance of UHPC
In order to reveal the influence of steel fiber type on the bonding performance of ultra-high performance concrete(UHPC)matrix,10 groups of double fibers pull-out tests were carried out with different straight circular fiber diameters(0.2 mm and 0.3 mm)and mixing amounts of silica fume as variables.The results show that with the increase in the mixing amount of silica fume,the pull-out load,pull-out work,and bond strength of the straight circular fiber with a diameter of 0.3 mm follow a trend of first increasing and then decreasing.When the mixing amount of silica fume is 20%,the utilization rate of steel fiber reaches its peak of 43%.A further analysis was made on the effect of the mixing amount of silica fume on straight circular fibers with a diameter of 0.2 mm,and it is found that the variation of evaluation parameters(such as pull-out load,pull-out work,and bond strength)is completely opposite to that of 0.3 mm fibers.Although the load-slip curves of the two kinds of steel fibers show some similarity in trend,the curves of the straight circular fibers with a diameter of 0.3 mm are relatively full,and there are many peaks and troughs.To sum up,both the steel fiber diameter and the mixing amount of silica fume largely influence the bonding performance of UHPC.This finding not only deepens the study of the internal mechanism of UHPC composites but also provides valuable reference for further optimizing the overall performance of UHPC and exploring its wider applications.

bridge engineeringultra-high performance concretedouble fibers pull-out testbonding performancesteel fiber type

袁明、朱海乐、颜东煌、朱楠萱、袁晟

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长沙理工大学 土木工程学院,湖南 长沙 410114

桥梁工程 超高性能混凝土 双丝拉拔试验 黏结性能 钢纤维类型

国家自然科学基金项目国家自然科学基金项目湖南省交通科技项目湖南省自然科学基金项目湖南省研究生科研创新项目湖南省研究生科研创新项目

52078054518780732019322021JJ30730CX20200832CX20190650

2024

10.16544/j.cnki.cn43-1494/u.202205182024101980

交通科学与工程
长沙理工大学

交通科学与工程

影响因子：0.444
ISSN：1674-599X
年,卷(期)：2024.40(5)
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