Mechanical Properties of Concrete with Recycled High-Density Polyethylene Macro Flat Fiber and Rice Hull Ash as Partial Replacement to Cement

Abstract

As concrete is still one of the most used in construction,developmenton improving its strength andpossible reduced environment impactis necessary.This study determines the mechanical properties of concrete with the addition of recycled High-Density Polyethylene (HDPE) Macro Flat Fiber (MFF) and Rice Hull Ash(RHA) as partial replacement to cement. The objective of this study is to identify theoptimum mix ratio for compressive and flexural strength of concrete. Various percentage of HDPE MFF (0.5%, 0.75%, and1.0%)and 10% partial replacement of RHA to cementis incorporated in the mixture. The RHA is obtained through uncontrolled burning whileHDPE MFF is collected through shredding and manual cutting. The results showed thatthe addition of HDPE MFF had a positiveeffect on the compressive and flexural strength of concrete. The optimum value is achieved on concrete with 0.5% HDPE MFF and no RHA, as it had showed an average of 31.87 MPa with a 18.04% increase in compressive strength, and an average of 4.532 MPawitha 17.78% increase for flexural strength. Moreover, the combination with RHA had not showed promising results. It had been concluded that the addition of recycled HDPE MFF with no RHA increases the compressive and flexural strength of concrete.