Utilization of Fiber Glass as an Additive Material in Concrete
K A Sambowo, R A Sumarno, I M Malik

Department of Civil Engineering, Engineering Faculty, State University of Jakarta

Abstract

Concrete material has a weakness in the very low flexural or tensile strength which is only around 9% - 15% of the compressive strength value. An alternative to increase the flexural strength of concrete is by adding fiber into the concrete mixture so that the flexural strength can increase in the concrete. Fiberglass is a composite material, which is liquid glass that is drawn into thin fibers in the form of threads and then impregnated with polyester plastic resin so that it has a tensile ability that can reach 3445 MPa and is corrosion resistant.
This study used a prism beam sample of 15 cm X 15 cm X 60 cm, and a cylindrical sample of 15 cm in diameter and a height of 30 cm as a control of concrete compressive strength. Variation in levels used was 0%, 0.5%, 1%, 1.5% and 2% of the weight of cement.
The control concrete compressive strength was 38,94 MPa with a water cement ratio of 0.46. The results showed that the value of concrete flexural strength of fiberglass concrete at levels of 0%, 0.5%, 1%, 1.5% and 2% were 3,86 MPa, 4,06 MPa, 4,09 MPa, 4,56 MPa and 4,71 MPa respectively.

Keywords: Concrete, Fiberglass, Compressive Strength, Flexural Strength

Topic: Civil Engineering