纤维与水泥砂浆界面黏结性能研究

摘要/Abstract

摘要： 本文采取“8字”型试件进行单根粗纤维拉拔试验,通过混合正交试验研究了纤维类型、纤维直径、纤维埋置长度及砂浆基体水胶比对纤维-砂浆界面黏结强度显著性优先次序,以及纤维与砂浆间最佳组合的影响。同时得到了纤维最大拔出荷载及荷载-滑移曲线,系统分析了纤维与水泥砂浆的界面黏结性能。试验结果表明,直径为0.6 mm、埋置长度为20 mm的聚丙烯粗纤维,水胶比为0.51的砂浆基体的界面黏结强度最大,其中平均黏结强度为7.71 MPa,等效黏结强度达到13.25 MPa。直径为0.6 mm、埋置长度为10 mm的聚乙烯醇(PVA)纤维,水胶比为0.41的砂浆基体的界面黏结强度次之。四种因素对界面黏结强度的影响优先次序为纤维种类、纤维直径、砂浆水胶比、纤维埋置长度,其中纤维种类对界面平均黏结强度的影响较为显著,纤维直径对界面等效黏结强度的影响较为显著。

关键词: 纤维增强混凝土, 钢纤维, 合成纤维, 界面, 界面黏结强度, 单根粗纤维拉拔试验, 荷载-滑移图, 显著性

Abstract: In this paper, a single coarse fiber pull-out test was carried out on a “figure-eight” specimen. Types of fibers, diameters of fibers, embedding lengths of fibers and water-binder ratio of mortar matrix were considered in the mixed orthogonal experiments to study the significant priority of the bond strength as well as the best combination between fiber and mortar matrix. Besides, the maximum fiber pull-out load and load-slip curves were obtained. The interface bonding performance of fiber and cement mortar matrix was systematically analyzed. The test results show that the interface bond strength of the polypropylene coarse fiber with a diameter of 0.6 mm and an embedded length of 20 mm to a mortar matrix with a water-binder ratio of 0.51 is the largest. The average bond strength of that is 7.71 MPa and the equivalent bond strength is up to 13.25 MPa. The interface bond strength of mortar matrix with polyvinyl alcohol (PVA) fiber with a diameter of 0.6 mm, an embedded length of 10 mm and a water-binder ratio of 0.41 is second. The priority of the influence of the four factors on the bond strength of the interface is fiber type, fiber diameter, water-binder ratio of mortar matrix and embedded length of fibers. The fiber type has a significant effect on the average bond strength of the interface, and the fiber diameter has a significant effect on the equivalent bond strength of the interface.

Key words: fiber reinforced concrete, steel fiber, synthetic fiber, interface, bond strength of interface, single coarse fiber pull-out test, load-slip diagram, significance

中图分类号:

TQ177.62

张献民, 陈雪芳, 李长辉, 霍海峰, 陈宇. 纤维与水泥砂浆界面黏结性能研究[J]. 硅酸盐通报, 2021, 40(12): 3927-3937.

ZHANG Xianmin, CHEN Xuefang, LI Changhui, HUO Haifeng, CHEN Yu. Research on Bonding Properties of Fiber and Cement Mortar Interface[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(12): 3927-3937.

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