Adaptable Design Theory and Reliability Verification of an Ecological High Ductility Cementitious Composites: Part Ⅰ, Adaptable Design Theory
GUO Liping1,2,3, CHEN Zhengkai1, CHEN Bo4, YANG Yanan1
1 School of Materials Science & Engineering, Southeast University, Nanjing 211189; 2 Jiangsu Key Laboratory of Construction Materials, Nanjing 211189; 3 Collaborative Innovation Center for Advanced Civil Engineering Materials, Nanjing 211189; 4 State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Nanjing Hydraulic Research Institute, Nanjing 210029
Abstract: Currently, various recycled solid waste powders and domestic designed synthetic fibers with high tensile strength and high modulus are widely used for preparing ecological high ductility cementitious composites (Eco-HDCC) in China. However, the theoretical criterion in classical design theory of HDCC is out of touch with the actual situation of the present Eco-HDCC materials, and can not be fully applied to the reliability design and performance control of multicomponent composite Eco-HDCC materials. Consequently, there is an urgent need for modifying and optimizing the classical design theory of HDCC. In this study, the classic design theory of HDCC was reformed by introducing two modified parameters, namely fiber dispersion coefficient and effective fiber volume ratio of main crack section, and limiting the value ranges of four key parameters according to theoretical calculation and test results. The reasonableness of design theory of suitability was evaluated by testing the mechanical pro-perties, micro-mechanical behaviors and fiber dispersion effect of the designed Eco-HDCCs with typical mix proportions. It could be proved by the results that Eco-HDCC held a steady performance of high ductility (the average ultimate tensile strain exceeds 2%) and featured multiple cracks when the modified design theory was adopted, and the value of four key parameters were carefully controlled within the optimizing range (namely, fiber dispersion index α* of 0.75—1, effective fiber volume fraction Vf,effect>1.5%, energy safe margin PSH1>2.0, stress safe margin PSH2>1.2). Accordingly, the results of this study can not only make design process of the Eco-HDCC composites prepared by various types of solid wastes and domestic synthetic fibers with high strength and high modulus be more reliable and flexible, but also satisfy different engineering demands of ductility and performance-price ratio, which exhibit important theoretical significance and engineering guidance value.
1 Li V C, Leung C K Y. Journal of Engineering Mechanics,1992,118(11),2246. 2 Pan Z, Wu C, Liu J. Construction and Building Materials,2015,78,397. 3 Turk K, Demirhan S. Canadian Journal of Civil Engineering,2013,40(2),151. 4 Li M, Li V C. Materials and Structures,2013,46(3),405. 5 Felekoglu B, Tosun-Felekoglu K, Ranade R, et al. Composites Part B: Engineering,2014,60,359. 6 Hussein M, Kunieda M, Nakamura H. Cement and Concrete Composites,2012,34(9),1061. 7 Hou L, Xu S, Liu H, et al. Journal of Advanced Concrete Technology,2015,13(2),82. 8 Sahmaran M, Lachemi M, Li V C. Concrete,DOI:10.1520/STP49084S. 9 Özbay E, Karahan O, Lachemi M. Composites Part B: Engineering,2013,45(1),1384. 10 Kim J K, Kim J S, Ha G J. Cement and Concrete Research,2007,37(7),1096. 11 Kojima S, Sakata N, Kanda T, et al. Concrete Journal,2004,42(5),135. 12 Fukuyama H, Suwada H, Ilseung Y. In: Proceeding DFRCC Int′l Workshop, Ta kayama, Japan,2002,pp.219. 13 Qudah S, Maalej M. Engineering Structures,2014,69(9),235. 14 Zhang L H, Guo L P, Sun W , et al. Journal of the Chinese Ceramic So-ciety,2014,42(8),1018(in Chinese). 张丽辉,郭丽萍,孙伟,等.硅酸盐学报,2014,42(8),1018. 15 Zhang L H, Guo L P, Sun W, et al. Journal of Southeast University (Natural Science Edition),2014,44(5),1037(in Chinese). 张丽辉,郭丽萍,孙伟,等.东南大学学报(自然科学版),2014,44(5),1037. 16 Chai L J, Guo L P, Chen B, et al. Journal of Southeast University (Natural Science Edition),2018,48(3),543(in Chinese). 柴丽娟,郭丽萍,陈波,等.东南大学学报(自然科学版),2018,48(3),543. 17 Guo L P, Chen B, Sun W, et al. Journal of Building Structures,2018,39(7),169(in Chinese). 郭丽萍,陈波,孙伟,等.建筑结构学报,2018,39(7),169. 18 Guo L P, Chen B, Sun W, et al. Journal of Southeast University (Natural Science Edition),2017,47(6),1221(in Chinese). 郭丽萍,陈波,孙伟,等.东南大学学报(自然科学版),2017,47(6),1221. 19 Jiang G Q. Preparation techniques, basic performances, micro-mechanism and simulation analysis of ECO-ECC. Ph.D. Thesis, Southeast University, China,2009(in Chinese). 姜国庆.ECO-ECC的制备技术,性能,微观机理及仿真分析.博士学位论文,东南大学,2009. 20 Zhang J, Ju X. Cement and Concrete Research,2011,41(8),903. 21 Tian L, Jing B, Zhao T J, et al. Building Science,2007,23(6),76(in Chinese). 田砺,荆斌,赵铁军,等.建筑科学,2007,23(6),76. 22 Zhu G H, Tian L, Guo P G, et al. Engineering Construction,2006,38(5),7(in Chinese). 朱桂红,田砺,郭平功,等.工程建设,2006,38(5),7. 23 Guo L L. Research and numerical simulation on the mechanical properties of strain hardening cementitious composites (SHCC). Master’s Thesis, Qingdao Technological University, China,2010(in Chinese). 郭磊磊.应变硬化水泥基复合材料(SHCC)力学性能研究及数值模拟.硕士学位论文,青岛理工大学,2010. 24 Li V C. In: Proceedings of 4th RILEM International Symposium on Fiber Reinforced Concrete. Sheffield,1992,pp.12. 25 Li V C, Mishra D K, Wu H C. Materials and Structures,1995,28(10),586. 26 Kanda T, Li V C. Journal of Advanced Concrete Technology,2006,4(1),59. 27 Marshall D, Cox B N. Mechanics and Materials,1988,7,127. 28 Li V C. Journal of Structural Mechanics and Earthquake Engineering,1993,10(2),37. 29 Redon C, Li V C, Wu C, et al. Journal of Materials in Civil Enginee-ring,2001,13(6),399. 30 Li V C. Structural Mechanics and Earthquake Engineering,1994,10(2),37. 31 Chen Z K. Optimized design and key performance of domestic green high ductility cementitious composites. Master’s Thesis, Southeast University, China,2015(in Chinese). 谌正凯.国产化绿色高延性水泥基复合材料优化设计与关键性能.硕士学位论文,东南大学,2015.
渝公网安备50019002502923号 版权所有：《材料导报》编辑部
2019, Vol. 33 
