Addition Of Polypropylene Fibers To The Compressive Strength And Split Tensile Strength Of Geopolymer Concrete Mixtures

Penambahan Serat Polypropylene Terhadap Kuat Tekan Dan Kuat Tarik Belah Campuran Beton Geopolimer

Abstract

The need for concrete in Indonesia is currently increasing, the first thing people often notice is the greenhouse gas emissions (carbon dioxide) produced during cement production. So one solution is to use other materials to replace the Portland cement used in making concrete.  Geopolymer concrete is a type of concrete made from natural materials such as volcanic ash and activated alkali. Geopolymer concrete has the disadvantage of low workability. This research aims to improve the workability and durability of geopolymer concrete by adding admixture and polypropylene fiber. The method used is the experimental method. In this study, the percentage of polypropylene fiber addition was 0,5%; 1%; 1,5%; and 2% of the concrete volume. Tests were conducted to obtain the maximum value of compressive strength and split tensile strength using cylindrical samples with a diameter of 10 cm and a height of 20 cm. The maximum compressive strength value occurs in the 0,5% variation of concrete with the addition of polypropylene fiber, which is 25,6 MPa, while the maximum split tensile strength value occurs in the 0,5% variation of concrete with the addition of polypropylene fiber, which is 2,767 MPa.