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浙江大学学报(工学版)
浙江大学学报(工学版)  2021, Vol. 55 Issue (1): 1-9    DOI: 10.3785/j.issn.1008-973X.2021.01.001
土木工程、交通工程、水利工程     
硅烷涂层提升钢纤维-砂浆界面性能的试验研究
姚勇1(),杨贞军2,*(),张麒3
1. 浙江大学 建筑工程学院，浙江 杭州 310058
2. 武汉大学 土木建筑工程学院，湖北省岩土与结构安全重点实验室，湖北 武汉 433000
3. 华鸿嘉信集团，浙江 杭州 310000
Experiment research on improving interface performance of steel fiber and mortal by silane coatings
Yong YAO1(),Zhen-jun YANG2,*(),Qi ZHANG3
1. College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China
2. Hubei Provincial Key Laboratory of Geotechnical and Structural Safety, School of Civil Engineering, Wuhan University, Wuhan 433000, China
3. Huahong Jiaxin Group, Hangzhou 310000, China
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摘要：

为了提升钢纤维-砂浆界面的黏结性能，采用9种基于硅烷的表面处理剂对钢纤维进行浸渍处理并高温固化成膜；埋置于水泥砂浆圆柱体试块中，开展单根纤维拉拔试验，获得拉拔荷载-位移曲线. 试验结果表明，采用不同的硅烷涂层对钢纤维进行表面改性，可以不同程度地改善钢纤维-砂浆界面的黏结性能；拉拔峰值荷载最高增加5.75倍，拉拔能耗最多增加2.48倍. 硅烷Z6011和Z6020及复合涂层能够较大幅度地提升界面黏结强度，主要增加钢纤维与砂浆界面的化学黏结力；硅烷Z6030和Z6040及复合涂层对界面黏结强度的提升幅度相对较小，主要增加界面滑移摩擦力. 采用扫描电子显微镜（SEM）研究界面黏结性能的提升机理，发现硅烷涂层使得界面过渡区的微观结构更致密，显著提升了钢纤维-砂浆之间的黏结性能.
关键词： 钢纤维混凝土;  硅烷;  表面改性;  拉拔试验;  界面过渡区    
Abstract:

Steel fibers were impregnated in nine types of silane based solutions and dried at a high temperature to form silane coatings in order to improve the interfacial bonding properties. The treated and untreated fibers were embedded in cylindrical specimens of cementitious mortar, and a single fiber pullout test was conducted to obtain load-displacement curves. The test results showed that surfacial treatment of steel fibers with different silane coatings improved the fiber and mortar interfacial bonding properties by different extents. The peak pullout load increased by a maximum of 5.75 times, and the energy consumption increased by a maximum of 2.48 times, respectively. Silane Z6011, Z6020 and their composite coatings can greatly improve the interfacial bonding strength. These coatings mainly increase the chemical bonding force between steel fiber and mortar. Silane Z6030, Z6040 and their composite coatings improve the interfacial bonding strength relatively small, and mainly increase the interface sliding friction. The scanning electron microscope (SEM) was used to observe the surface of steel fibers and the interfacial transition zone of steel fibers and cementitious mortar. Results show that the silane based solutions can effectively form coatings on the surface of steel fibers. The silane coatings made the microstructure of the interface transitional zone denser, leading to significant improvement on the bonding behavior between steel fibers and mortar.
Key words: steel fiber reinforced concrete    silane    surface modification    pullout test    interfacial transition zone
收稿日期: 2020-04-10 出版日期: 2021-01-05
CLC:  TU 528  
基金资助: 国家自然科学基金资助项目（51779222，51974202）；中德科学中心合作交流项目（M-0172）
通讯作者: 杨贞军     E-mail: yyong102@zju.edu.cn;zhjyang@whu.edu.cn
作者简介: 姚勇（1992—），男，博士生，从事钢纤维混凝土的研究. orcid.org/0000-0001-5264-6813. E-mail： yyong102@zju.edu.cn
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引用本文:

姚勇,杨贞军,张麒. 硅烷涂层提升钢纤维-砂浆界面性能的试验研究[J]. 浙江大学学报(工学版), 2021, 55(1): 1-9.

Yong YAO,Zhen-jun YANG,Qi ZHANG. Experiment research on improving interface performance of steel fiber and mortal by silane coatings. Journal of ZheJiang University (Engineering Science), 2021, 55(1): 1-9.

链接本文:

http://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2021.01.001    或    http://www.zjujournals.com/eng/CN/Y2021/V55/I1/1

图 1  单根钢纤维拉拔试件
图 2  单根钢纤维拉拔试验装置
图 3  4种硅烷（Z组）改性钢纤维拉拔荷载-位移曲线
图 4  4种硅烷与硝酸锆复合剂（ZZ组）改性钢纤维拉拔荷载-位移曲线
图 5  硅烷与六氟锆酸（ZH2组）改性钢纤维拉拔荷载-位移曲线
图 6  原钢纤维（U组）拉拔荷载-位移曲线
图 7  单根钢纤维拉拔试验典型荷载-位移曲线[22]
编号 处理方式 Pe/N Pmax/N Ps/N τmax/MPa τc/MPa τf/MPa G/J
U 未处理 70.65 99.91 41.95 0.80 0.46 0.33 1.07
Z1 Z6011 546.88 673.96 158.95 5.37 4.10 1.27 3.71
Z2 Z6020 407.25 467.10 132.35 3.72 2.67 1.05 2.43
Z3 Z6030 126.11 141.22 83.22 1.12 0.46 0.66 2.02
Z4 Z6040 233.74 260.43 138.57 2.07 0.97 1.10 2.76
ZZ1 Z6011+Zr（NO3）4 569.51 613.84 142.09 4.89 3.76 1.13 3.19
ZZ2 Z6020+Zr（NO3）4 404.70 475.95 140.37 3.79 2.67 1.12 3.56
ZZ3 Z6030+Zr（NO3）4 96.82 110.83 50.41 0.88 0.48 0.40 1.08
ZZ4 Z6040+Zr（NO3）4 174.03 186.43 108.25 1.48 0.62 0.86 2.41
ZH2 Z6020+H2ZrF6 522.34 587.41 156.05 4.68 3.43 1.24 3.52
表 1  拔出试验结果
图 8  拉拔荷载（Pe, Pmax, Ps）
图 9  界面黏结强度（τmax =τf +τc）
图 10  各组钢纤维拔出能量
图 11  处理后纤维界面黏结强度及拔出能量增加量
图 12  拉拔试验前钢纤维表面的SEM图像和EDS图谱
图 13  拉拔试验前的钢纤维表面SEM图像
图 14  拔出试验后的钢纤维表面SEM图像
图 15  钢纤维与砂浆界面过渡区SEM图像
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