Experimental investigation on durability properties of ramie fibers and hooked-end steel fibers reinforced high strength concrete incorporating silica fume and metakaolin
- Vol.96(12), Dec
- Mumbai ACC LTD 2022
- 46-58p.
The durability properties of hybrid fiber-reinforced high-strength concrete (HFRHSC) were examined in this research. Ramie fibers and hooked-end steel fibers combination is a new one and these combinations highly enhance the performances of the concrete specimens. Silica fume and metakaolin were added to both HFRHSC and conventional concrete specimens. Ramie fiber usage in concrete is a new trend and it gives good results compared to other types of natural fibers. The optimum contents of silica fume and metakaolin are 10 % and 5 % respectively. A concrete mix of grade M70 is used for this investigation. For developing HFRHSC, different proportions of ramie and steel fibers are mixed with cementitious composites. Ramie fiber fractions of 0.5, 1, 1.5, and 2 % are kept constant with varying fractions of hooked-end steel fibers of 17 different mixes prepared. The durability properties of HFRHSC are determined by different tests such as water absorption, acid test, sorptivity test, drying test, sulfate test, and marine attack test. The water absorption of HFRHSC is decreased by 4.5 %; whereas, the sorptivity and drying shrinkage are decreased by 3.5, and 3 % respectively. Furthermore, the results of the acid test of HFRHSC are decreased by 10 %, the sulphate attack test of HFRHSC is decreased by 12 % and the marine attack test results achieves 11 % compared to the conventional concrete specimens. The hybrid fiber-reinforced concrete specimens exhibit a highly reduced absorption capacity than conventional concrete specimens. The effects of HFRHSC in acid tests show less deterioration compared to conventional concrete specimens.