磷酸锌改性钢纤维对UHPC单轴拉伸性能的影响.pdf

16年第9期(总第323期
混凝
士
原材料及辅駒物料
Number 9 in 2016(Total No 323
Concrete
MATERIAL AND ADMINICLE
doi:10.3969%-is1002-3530.2016.09.013
磷酸摔改性钢纤维对UHPC单轴拉伸性能的影响
张丽辉12,刘建忠12,刘加平2,阳知乾2,沙建芳12,吕进12
(1高性能土木工程材料国家重点实验室江苏省建筑科学研究院,江苏南京210008
2.江苏苏博特新材料股份有限公司,江苏南京211103)
摘要:系统研究了不同质量摻量下,磷酸锌(ZnPh)改性及未改性钢纤维对超高性能混凝土(UHPC)単轴拉伸性能的影响,并
采用单根纤维拨出试验、扫描电镜(SEM)及能谱仪(EDS)分别对纤维桥联作用、纤维/基体界面及纤维表观的形貌和元素进行分
析。结果表明;钢纤维掺量相同时,与未改性钢纤维 UEPC相比,ZnPh改性钢纤维UHPC的极限抗拉强度和轴拉韧性比均增大
以掺量为160kgm2时最优,此时二者分别为9.00MPa和0.85;单根ZmPh改性钢纤维拔出行为的最大力、界面剪切强度和拔出耗
能相较单根未改性钢纤维的分别提高了45.47%、45.239%、49.37%;ZnPh改性钢纤维与UHPC基体间更加致密的界面性能、纤维表
面更多的水化产物黏附和“沟壑”为单根ZnPh改性钢纤维拔出性能的增强及其UHPC単轴拉仲性的提升莫定了基础。
关键词:磷酸锌改性钢纤维;超高性能混凝士;单轴拉伸性能;机理分析
中图分类号:TU528.04
文献标志码
文章编号:1002-355002016)09-0052-04
Effect of zinc phsphate-teatd steel ber on naxia nsile prperty of utrahigh performance concret
ZHANG Lihui, LIU Jianzhong LTU Jiaping,, YANG Zhi a, HA Jianing 2, L Jin 2
1 State Key Laboratory of High Performance Civil Enginering Materials, Jian u Research Institute of Building Science
Nanjing 210008, China; 2. Jiangsu Sobute New Materials Co, Ltd. Nanjing 2[1103, China)
Abstract: Effects of zi hoshate-trated( Ph and un-trated steel fibers with difierent mass dosages on the uni-axial tensile prop
rty ofultra-high performance conc(HP were inv sgd s macally and in l-sided fr pulu t, scanning electron m
croscope and energy dispersive permeter were ed o determine steel fibers ridging function, morphologies of interface between
see fiber and HPC matrix and sufas of te fibers and chemical lem ns of el fbe suces, pectively. The experimental re
sul show that UHPCS in the presence of Znph reated steel fibers possess better ultimate tensile strength and toughness ratio than that of
UHPC with he same mass dosages of untreated steel ibers Also, he ultima ens le stength and toughess ratio of UHPCS with Znph
trea ed steel fibers at the mass dosage of 160 k eaching he mal value ae00 Mpa and 85 respectivel Compared to the n
treated steel fiber he ultimae load, e iner acial shear stength and pull-out energy of Znph eated fiber in the singlesided pullout test
are increased y 45. 47% 4523%and 49. 37, r el Te m dnr nn r ad l er an maix
in the Znph treated steel fibers surfaces are basic foundations for obta
gt
pullout property of Znph treated steel fiber extracted from the UHP matrix and improved ensile u ess of Ps with Znph eated
Key words: zinc posphate reaed steel fiber; ultra-high performance concrete uniaxial tensile property mechanismanalysis
和纤维确定时,优异的纤维/基体界面性能是保证UHPC
韧性提升得以实现的关键因素η,纤维/基体界面性能主
超高性能混凝土(UIua- High Performance Concrete,要由二者间摩療黏结力、机械内锁作用(当纤维截面形状
UHPC)具有超高强、高韧和高耐腐蚀等优异性能,能满足为波浪、扭曲或端部穹钩时)和化学黏结力决定,若纤维
土木工程结构轻量化、高层化、大跨化和高耐久的要求,是表面光滑、化学结合力弱将导致纤维/基体界面黏结失效,
混凝土科技发展的重要方向之一、为了提高UHPC韧性为了提高钢纤维与水泥基体间界面的化学黏结力,对钢纤
必须摻人入适量纤维,而评价UHPC韧性通常对其单轴拉伸维表面进行化学处理是最主要的技术措施,已见研究报道
性能进行测试。众多研究指出 OHIPC单轴拉伸性能受很多关于钢纤维表面化学处理仅有在其表面沉积礫酸锌涂层
因素如纤维(强度、几何尺寸、外观、掺量和分布)、基体(强(ZnPh)u。 Aggelis 4等通过声发射法(AE)研究指出钢纤
度、刚度和泊松比)及界面的影响。因此,当UHPC基体维表面化学处理增加了纤维与基体间的界面黏结强度及
收稿日期:2015-10-29
基金项目:国家自然科学基金重点项日(51438003);江苏省科技计划青年基金项日(BK20141012);六大人オ高峰项目(2013-JZ003)
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