Effects of Fiber Distribution and Orientation Distribution Based on Image Processing on Bending Properties of PVA Fiber Reinforced Cementitious Composites
1 College of Information Engineering, Inner Mongolia University of Technology, Hohhot 010051; 2 College of Construction Engineering, Inner Mongolia Technical College of Construction, Hohhot 010070; 3 College of Civil Engineering, Inner Mongolia University of Technology, Hohhot 010051; 4 College of Science, Inner Mongolia University of Technology, Hohhot 010051
Abstract: Fiber distribution and orientation distribution play a key role in bending property of PVA fiber reinforced cementitious composites. PVA fibers distribution and orientation distribution based on image processing was quantitatively measured by fluorescence microscope images methods. Meanwhile, the effects of different formation of cementious matrix due to component adjusting on fibers distribution were discussed. Moreover, effects of fiber distribution and orientation distribution on bending properties of PVA fiber reinforced cementitious composites were comprehensively studied. The results of the distribution of PVA fibers showed that uniformity of the formation of cementious matrix was beneficial to good fibers distribution. At the same time, higher fiber distribution coefficient would lead to higher strength and ductility of the specimens with the same component and processing. The results of the orientation distribution of fibers showed that high distribution probability of orientation angle approaching to 90° between fiber length direction and the polishing surface direction contributed to high ductility of the specimens.
1 Li V C. On engineered cementitious composites: A review of the material and its applications[J]. J Adv Concr Technol,2003,1(3):215. 2 Li V C, Wu C, Wang S X, et al. Interface tailoring for strain-har-dening PVA-ECC [J]. ACI Mater J,2002,99(5):463. 3 Li V C, Mishra D K, Wu H C. Matrix design for pseudo strain-hardening fiber reinforced cementitious composites [J]. Mater Struct,1995,28(10):586. 4 Niu Hengmao, Wu Wenhong, Xing Yongming, et al. Effects of water/cement ratio on properties and microstructure of PVA fiber reinforced cementitious composites[J] Acta Mater Compos Sin,2015,32(4):1067(in Chinese). 牛恒茂, 邢永明, 武文红,等. 水灰比对PVA纤维增强水泥基复合材料性能和显微结构的影响[J]. 复合材料学报,2015,32(4):1067. 5 Akkaya Y, Shah S P, Ankenman B. Effect of fiber dispersion on multiple cracking of cement composites[J]. J Mater Civil Eng,2001,127(4):311. 6 Su T K, Jin K K. The relation between fiber orientation and tensile behavior in an ultra high performance fiber reinforced cementitious composites (UHPFRCC) [J]. Cem Concr Res,2011,41(10):1001. 7 Kang S T, Lee B Y, Kim J K, et al. The effect of fibre dispersion characteristics on the flexural strength of steel fibre-reinforced ultra high strength concrete[J]. Constr Build Mater,2011,25(5):2450. 8 Zhou J, Qian S Z, Guang Y, et al. Improved fiber distribution and mechanical properties of engineered cementitious composites by adjusting the mixing sequence[J]. Cem Concr Compos,2012,34(3):342. 9 Zerbino R, Tobes J M, Bossio M E, et al. On the orientation of fibres in structural members fabricated with self compacting fibre reinforced concrete[J]. Cem Concr Compos,2012,34(2):191. 10 Li M, Li V C. Rheology, fiber dispersion, and robust properties of engineered cementitious composites[J]. Mater Struct,2013,46(3):405. 11 Martinie L, Roussel N. Simple tools for fiber orientation prediction in industrial practice[J]. Cem Concr Res,2011,41(10):993. 12 Burak F, Kamile T, Ravir R, et al. Influence of matrix flowability, fiber mixing procedure, and curing conditions on the mechanical performance of HTPP-ECC[J]. Composites Part B,2014,60(60):359. 13 Naaman A E, Reinhardt H W. Proposed classification of FRC composites based on their tensile response[J]. Mater Struct,2006,39(5):547. 14 ASTM C 1609/C 1690M-05. Standard test method for flexural performance of fiber reinforced concrete (using beam with third-point loading) [S]. America: American Society of Testing and Materials,2006:1. 15 Su T K, Jin K K. Numerical simulation of the variation of fiber orientation distribution during flow molding of ultra high perfor-mance cementitious composites (UHPFRCC) [J]. Cem Concr Compos,2012,34(2):208. 16 Torigoe S, Horikoshi T, Ogawa A. Study on evaluation method for PVA fiber distribution in engineered cementitious composite[J]. J Adv Concr Technol,2003,1(3):265. 17 Kobayashi K, Cho R. Fiber reinforced concrete. Fiber-reinforced concrete: German Patent, 3161293[P/OL]. 1983-12-8. http://www. freepatentsonline.com/DE3161293.html 18 Wang S X, Li V C. Tailoring of pre-existing flaws in ECC matrix for saturated strain hardening[C]//Proceedings of FRAMCOS-5, Vail, Colorado, USA,2004:1005. 19 Shi Huisheng, Fang Zefeng. Influence of fly ash on early hydration and pore structure of cement pastes[J].J Chin Ceram Soc,2004,32(1):95(in Chinese). 施惠生,方泽锋. 粉煤灰对水泥浆体早期水化和孔结构的影响[J].硅酸盐学报,2004,32(1):95.
渝公网安备50019002502923号 版权所有：《材料导报》编辑部
2017, Vol. 31 
