Pengaruh Konsentrasi Dan Rasio Berat Grafena Pada Geopolimer Berbasis Limbah Fly Ash Pabrik Kelapa Sawit Dengan Aktivator KOH

Abstract

Geopolimer is a synthesis of organic polymers with high concentrated alkaline activator reacting with SiO2 and Al2O3 in fly ash. Geopolimer can reduce the use of OPC and reducing solid waste (fly ash) the result of burning oil palm shells in the industry’s oleokimia at Riau Province. This research aims to make the fly ash-based factory geopolimer palm oil is obtained from PT. Bangun Tenera Riau (PT. BTR) with the addition of graphene as a filler
and determine the influence of the concentration of graphene and graphene weight ratio against the compressive strength, porosity, and morphological properties of geopolimer. The making of geopolimer include the preparation of fly ash and sand and then continued with the creation of alkaline activator (KOH + sodium silicate) with variation concentration of
graphene 10 mg/ml, 20 mg/ml, 30 mg/ml, as well as the weight ratio of graphene 0 %wt, 0.1 %wt, 0.4 %wt, and 0.7 %wt. Raman Spectroscopy Analysis of graphene shows graphene produced during the process turbulance assisted shear exfoliation (TASE) is a few layer graphene (FLG). XRD analysis showed the highest intensity of graphene on geopolimer is
1849.26 cts on 25.4112 °. The SEM analysis showed the increasing graphene, closer the structure of geopolymer. The value of compressive strength in addition concentrations of graphene 30 mg/ml and weight ratio of graphene 0.7 wt% i.e. 10.8 MPa with an increasing
compressive strength 74.19%. The value of the lowest porosity on the concentration of graphene 30 mg/ml and weight ratio of graphene 0.7% i.e. 5.92%.
Keywords : fly ash, geopolimer, graphene, OPC, TASE