Strength of geopolymer concrete bricks using crushed stone

Abstract

The paper studies the strength of unburnt concrete brick, using crushed stone and the geopolymer technology instead of the traditional cement. Experiments based on the effect of the ratio of crushed stone (5-10mm) to sand, the ratio of sodium silicate/sodium hydroxide (SS/SH) in the activated alkaline solution and heat curing time to compressive strength. Experimental results show that the proportion with the ratio of crushed stone/sand of 75/25, SS/SH ratio of 2 and 10 hours heat curing gives the highest value. Using this proportion with the same heat curing condition to cast the brick sample, the masonry geopolymer brick products reach compressive and tensile strength values ​​up to 24,06MPa and 7,51MPa, respectively. This study showed that geopolymer unburnt bricks using crushed stone can be applied for bearing wall, high-strength pavement bricks, ...