Effects of CaCO 3 whisker, hybrid fiber content and size on uniaxial compressive behavior of cementitious composites
Author(s) -
Li Li,
Cao Mingli,
Xie Chaopeng,
Yin Hong
Publication year - 2019
Publication title -
structural concrete
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.912
H-Index - 34
eISSN - 1751-7648
pISSN - 1464-4177
DOI - 10.1002/suco.201800185
Subject(s) - whisker , materials science , composite material , polyvinyl alcohol , fiber , compressive strength
Introduction of hybrid fiber and calcium carbonate (CaCO 3 ) whisker could improve the properties of cementitious composites. Nevertheless, little attention has been paid to influences of steel‐polyvinyl alcohol (PVA) hybrid fiber and whisker on stress–strain behavior of hybrid fiber reinforced cementitious composites (HFRCC). In this research, 19 groups of mixtures have been used to explore this topic. The results present that CaCO 3 whisker can improve the compressive strength, peak strain and prepeak strain energy of steel‐PVA HFRCC. Generally, HFRCCs reach better compressive behavior when the fibers size are grading. For example, 13 mm steel fiber+ 6 mm PVA fiber+ whisker and 35 mm steel fiber+ 12 mm PVA fiber+ whisker are better than 13 mm steel fiber+ 12 mm PVA fiber+ whisker and 35 mm steel fiber+ 6 mm PVA fiber+ whisker. The results are employed to develop formulas for calculating the strength, deformation, and toughness of HFRCC. Two models were developed to evaluate the stress–strain response of HFRCC. The prediction results of prepeak stress–strain curves using Model 2 (piecewise function involves a cubic parabola and a rational fraction) are closer to the experimental curves and lower than those using Model 1 (continuous rational power function). Therefore, Model 2 is recommended if more accurate prediction of the prepeak stress–strain curve is required. Otherwise, the simpler Model 1 can be used.