Workability of coconut fiber concrete with rice husk ash as a sand replacement

Fiber concrete has been widely known for its ability to prevent cracks especially micro crack. Natural fiber concrete was one way to accommodate the use of waste natural fibers and at the same time producing sustainable materials. This research tried to examine the workability of Coconut Fiber Concrete (CFC) that incorporated 2% of Coconut Fiber (CF) with Rice Husk Ash (RHA) as a sand replacement with ratio 10, 20 and 30% respectively. Three types of water-cement ratios were used 0.38, 0.41 and 0.44. The result showed that slump value ranging from 3.5 cm and 4 cm. The addition of 20% of RHA resulted in the steady slump value for all water-cement ratio. The CFC is on the same par compare to the steel fiber concrete which incorporated 1.28% fiber.