Possibility of making heavyweight concrete using waste aluminum dust and geopolymer binder from material sources in Vietnam

Abstract

This article has shown the potential for making heavyweight concrete using waste aluminum dust and Geopolymer adhesive from a mixture of Vietnamese industrial waste. In particular, aluminum dust, fly ash from Mong Duong 02 thermal power plant, and Hoa Phat finely ground blast furnace slag are used as mineral materials. While NaOH solution with a concentration of 12 M and Na2SiO3 has a silicon module. 2.75 was used as the activating solution. In addition, aluminum dust was also used to reduce residual alkalinity in this study. The ratio between the activated solution and the mineral material investigated was 0.40. The investigated contents of aluminum dust, blast furnace slag, and fly ash were 10%, 30%, and 60% mineral material content, respectively. The workability of the concrete mixture is determined by the slump in a standard cone, and the strength of the test samples is determined on a cylindrical sample measuring 150x300 mm. At the same time, the adhesion force between heavyweight concrete and reinforcement is determined according to 22 TCN 60-84. Experimental results have shown that the concrete mixture has an average slump of about 14 cm, compressive strength at 28 days is about 49.02 MPa and average bond strength between concrete and reinforcement is about 15.66 MPa.

Keywords: Heavyweight concrete; fly ash; franulated blast furnace slag; flkali-activator; compressive strength.