Abstract
Nowadays researchers are developing a new hybrid fiber reinforced cement-based composites (HyFRCC). The new HyFRCC can restrain micro-cracking, improves compressive and flexural performance of beams by addition of calcium carbonate (CaCO3) whisker, polyvinyl alcohol (PVA) fiber and steel fiber. In this work, a mix optimization procedure is shown for multi-scale HyFRCC, with steel, PVA fiber and CaCO3 whisker. The new HyFRCC is explored with addition of coarse sand to further improve its mechanical properties. Additionally, the flexural performance of beam and slabs has been investigated to optimize sand gradation and fiber combination in new HyFRCC. The compressive strength, flexural strength, flexural behavior, flexural toughness, equivalent flexural strength and deflection-hardening behavior of beams and slabs are improved with optimized content of sand gradation, fibers and CaCO3 whisker. The HyFRCC slab with 1.5% steel fiber, 0.4% PVA fiber, 1% CaCO3 whisker and optimized coarse sand showed overall best properties.
Highlights
RESUMEN: Effecto de fibras híbridas, filamentos de carbonato cálcico y arena gruesa en las propiedades mecánicas de cementos compuestos
The fiber cost of hybrid fiber reinforced cement-based composites (HyFRCC) with 1.5% steel fiber, 0.4% polyvinyl alcohol (PVA) fiber and 1% CaCO3 whisker is $365 per cubic meter, while that with 2% steel fiber is $437 per cubic meter according to Chinese market price
The flexural toughness and number of cracks at mid span of HyRCC incorporating 1.5% steel fiber, 0.4% PVA fiber and 1% CaCO3 whisker are increased by 20% and 760%, respectively, as compared to that of HyRCC with 2% steel fiber [5]
Summary
RESUMEN: Effecto de fibras híbridas, filamentos de carbonato cálcico y arena gruesa en las propiedades mecánicas de cementos compuestos. Researchers [5, 15] have worked on the development of a multi-scale cost-effective hybrid fiber reinforced cement-based composites (HyFRCC) incorporating micron calcium carbonate (CaCO3) whisker to restrain the initiation and growth of micro-cracks. In comparison with HyFRCC incorporating steel and polyvinyl alcohol (PVA) fiber [4, 13, 14]; the steel fiber ($2800 per ton) and PVA fiber ($5950 per ton) were partially replaced by cheaper CaCO3 whisker ($236 per ton) mainly to improve the mechanical performance as well as reduce the production cost. The new HyFRCC can restrain plastic shrinkage, improves compressive and flexural performance of beams efficiently by addition of micro-CaCO3 whisker, meso- PVA fiber and macro- steel fiber [5, 15]. The numeric value after S, P and W shows the percentage of fibers by total volume fraction
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