Effect of alkaline solution to binder ratio on the fracture parameters of lightweight geopolymer concrete based on fly ash

Abstract

<span style="letter-spacing: -.1pt;">Geopolymer concrete is an innovative building material that is produced by the chemical action of mineral molecules. Removal of cement is one of the great advantages of the use of geopolymer concrete. For this reason, to know the types of geopolymer concrete, it is important to examine its different components and their effect on fracture parameters. In this paper, the fracture parameters of lightweight geopolymer concrete based on class C fly ash (LWFCGC) are presented. In this research, three mix designs with the activator to binder ratios of 0.4, 0.5 and 0.6 were considered. By changing the ratio of activator to glue from 0.6 to 0.4, compressive strength from 18.9 MPa to 28.4 MPa, toughness from 14.07 MPa mm to 19.04 MPa mm 0.5, fracture energy from N/ 17.31 m to 20.98 N/m and the length of the fracture process area changed from 54.12 mm to 29.07 mm.</span>