Utilization of Coconut Coir as an Additional Fiber Reinforcement and Partial Replacement of Sand in Concrete Hollow Block

Christian Samson and Dr. Ma. Magdalena Gatdula
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Christian Samson: MSCE, Graduate School, Bulacan State University, Malolos City, Bulacan, Philippines
Dr. Ma. Magdalena Gatdula: MSCE, Graduate School, Bulacan State University, Malolos City, Bulacan, Philippines

International Journal of Research and Innovation in Applied Science, 2025, vol. 10, issue 4, 470-478

Abstract: Conventional Concrete Hollow Blocks (CHB) use sand as an aggregate. However, this research studies the utilization of an alternative aggregate, such as coconut coir, which has potential use for recycled materials. Philippines, as one of the largest coconuts producing country in the world too much coconut waste are being produced every day in our country. Though there are other studies trying to maximize the use of coconut fiber, a large portion of the wastes are left unused or burnt affecting our natural environment. This research explores the possibility of utilizing coconut coir as fiber reinforcement and an alternative aggregate for hollow CMU by replacing a fraction of sand with coconut coir. Tests shows that on seventh day, the proportion A(control) and B (CHB with 1% coir) attained a compressive strength above 3.45 MPa, the minimum value stipulated in ASTM C-129 for Hollow non-load bearing CMU. All the samples comply in the maximum requirements for water absorption and moisture content tests which is 240Kg/m3 and 45 percent respectively. Not only does the addition of coconut coir improves the durability of CHB, but equally significant are the potential of recycling materials for a better environment and economic impact in communities where coconut production is abundant.

Date: 2025
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