Observational analysis found improved flexural and compressive strength in M30 and M35 grades, suggesting natural fibers as a sustainable option.
Since concrete, the most extensively used material in the world, is weak in tension and strong in compression, its flexural strength is lower than its compressive strength. Fiber is one of the components utilized in concrete to improve its tensile qualities. Based on the findings that natural jute fibers enhance flexural strength, coconut fiber increases flexural strength. We also discovered that natural fibers with a higher percentage of natural fibers have a lower compressive strength than natural fibers with a lower percentage of natural fibers (coconut Fiber, jute fiber). After addition 0.5 % jute to M30 grade, the highest compressive strength was 45.23 N/mm 2 , which was 14.50 % higher than that of the reference mixture M30. After adding 0.5 % jute, the maximum compressive strength for M35 grade was 51.75 N/mm 2 , which was 15% higher than that of the reference mixture M30. The M30 grade’s maximum compressive strength, with the addition of 0.5 % coconut fiber, was 48.15 N/mm 2 , 21.89 percent higher than that of the reference mixture M30. The ideal compressive strength for M35 grade was 51.48 N/mm 2 , which was 14.43 % higher, following a 0.5 percent addition of coconut fiber. Following a 1 percent jute addition, the maximum flexural strength in M30 grade was 6.51 N/mm 2 , 17.72% more than that of the control mix M30. When 1% jute was added to M35 grade, the maximum flexural strength was 6.91 N/mm 2 , 17.11% more than that of the reference mixture M35. After adding 0.5 percent coconut fiber to M30 grade, the maximum flexural strength was 5.98 N/mm 2 , which was 7.96 % higher than that of the control mix M30. When 1 percent coconut fiber was added to M35 grade, the highest flexural strength evaluated was 6.10 N/mm 2 , which was 3.39 % more than that of the reference mixture M35. As a result, we discovered that increasing the overall strength and durability of the design mix over the nominal mix should lead to greater use of inexpensive and sustainable concrete.
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Meena et al. (2025) studied this question.