How do fiber shape and matrix composition affect fiber pullout behavior and flexural properties of UHPC?

Naaman, 1991, Fiber pullout and bond slip I: analytical study, J. Struct. Eng., 117, 2769, 10.1061/(ASCE)0733-9445(1991)117:9(2769) Naaman, 1991, Fiber pullout and bond slip II: experimental validation, J. Struct. Eng., 117, 2791, 10.1061/(ASCE)0733-9445(1991)117:9(2791) Richard, 1994, Reactive powder concretes with high ductility and 200-800 MPa compressive strength, ACI Mater. J., 144, 507 Park, 2012, Tensile behavior of ultra high performance hybrid fiber reinforced concrete, Cement Concr. Compos., 34, 172, 10.1016/j.cemconcomp.2011.09.009 Kang, 2010, Tensile fracture properties of an ultra high performance fiber reinforced concrete (UHPFRC) with steel fiber, Compos. Struct., 92, 61, 10.1016/j.compstruct.2009.06.012 Zollo, 1997, Fiber-reinforced concrete: an overview after 30 years of development, Cement Concr. Compos., 19, 107, 10.1016/S0958-9465(96)00046-7 Lee, 2011, Study of interfacial microstructure, fracture energy, compressive energy and debonding load of steel fiber-reinforced mortar, Mater. Struct., 44, 1451, 10.1617/s11527-011-9710-4 Wille, 2012, Pullout behavior of high-strength steel fiber embedded in ultra-high-performance concrete, ACI Mater. J., 109, 479 Wu, 2007, Effect of nano-SiO2 particles and curing time on development of fiber-matrix bond properties and microstructure of ultra-high strength concrete, Cement Concr. Res., 95, 247, 10.1016/j.cemconres.2017.02.031 Chan, 2004, Effect of silica fume on steel fiber bond characteristics in reactive powder concrete, Cement Concr. Res., 34, 1167, 10.1016/j.cemconres.2003.12.023 Wille, 2013, Effect of ultra-high-performance concrete on pullout behavior of high-strength brass-coated straight steel fibers, ACI Mater. J., 110, 451 Li, 1996, Effect of plasma treatment of polyethylene fibers on interface and cementitious composite properties, J. Am. Ceram. Soc., 79, 700, 10.1111/j.1151-2916.1996.tb07932.x Li, 1997, Interface property characterization and strengthening mechanisms in fibre reinforced cement based composites, Advan. Cem. Based Compos., 6, 1, 10.1016/S1065-7355(97)90001-8 Robins, 2002, Pull-out behaviour of hooked steel fibres, Mater. Struct., 35, 434, 10.1007/BF02483148 Lee, 2010, Pullout behavior of inclined steel fiber in an ultra-high strength cementitious matrix, Construct. Build. Mater., 24, 2030, 10.1016/j.conbuildmat.2010.03.009 Shi, 2015, A review on ultra high performance concrete Part I: raw materials and mixture design, Construct. Build. Mater., 101, 741, 10.1016/j.conbuildmat.2015.10.088 Chanvillard, 1996, Pull-out behavior of corrugated steel fibers: qualitative and statistical analysis, Advan. Cem. Based Mater., 4, 28 Zīle, 2013, Effect of the fiber geometry on the pullout response of mechanically deformed steel fibers, Cement Concr. Res., 44, 18, 10.1016/j.cemconres.2012.10.014 Wu, 2016, Effects of steel fiber content and shape on mechanical properties of ultra high performance concrete, Construct. Build. Mater., 103, 8, 10.1016/j.conbuildmat.2015.11.028 Kim, 2011, Comparative flexural behavior of hybrid ultra high performance fiber reinforced concrete with different macro fibers, Construct. Build. Mater., 25, 4144, 10.1016/j.conbuildmat.2011.04.051 Wu, 2016, Influence of silica fume content on microstructure development and bond to steel fiber in ultra-high strength cement-based materials (UHSC), Cement Concr. Compos., 71, 97, 10.1016/j.cemconcomp.2016.05.005 Wu, 2016, Effects of different nanomaterials on hardening and performance of ultra-high strength concrete (UHSC), Cement Concr. Compos., 70, 24, 10.1016/j.cemconcomp.2016.03.003 Scrivener, 2004, The interfacial transition zone (ITZ) between cement paste and aggregate in concrete, Interface Sci., 12, 411, 10.1023/B:INTS.0000042339.92990.4c Xie, 2015, Experimental study of the interfacial transition zone (ITZ) of model rock-filled concrete (RFC), Cement Concr. Compos., 55, 223, 10.1016/j.cemconcomp.2014.09.002 Banthia, 1990, A study of some factors affecting the fiber-matrix bond in steel fiber reinforced concrete, Can. J. Civ. Eng., 17, 610, 10.1139/l90-069 Pompo, 1996, Analysis of steel fiber pull-out from a cement matrix using video photography, Cement Concr. Compos., 18, 3, 10.1016/0958-9465(95)00034-8 Shah, 1995 Laranjeira, 2010, Predicting the pullout response of inclined hooked steel fibers, Cement Concr. Res., 40, 1471, 10.1016/j.cemconres.2010.05.005 Zhang, 2003, Effect of water-to-cementitious materials ratio and silica fume on the autogenous shrinkage of concrete, Cement Concr. Res., 33, 1687, 10.1016/S0008-8846(03)00149-2 Wu, 2017, Static and dynamic compressive properties of ultra-high performance concrete (UHPC) with hybrid steel fiber reinforcements, Cement Concr. Compos., 31, 148, 10.1016/j.cemconcomp.2017.02.010 Krenchel, 1964 Gao, 2010 Han, 2016, Microstructure related mechanical behaviors of short-cut super-fine stainless wire reinforced reactive powder concrete, Mater. Des., 96, 16, 10.1016/j.matdes.2016.02.004