Research of the characteristics and technical requirements on brick products using fly ash and slag ash

Abstract

Currently, along with socio - economic development, the demand for construction materials is increasing, and there is a need to promote the use of environmentally friendly materials. On the other hand, the amount of fly ash and slag from coal - fired thermal power plants increases rapidly each year and the dumps are almost overloaded, so the urgent problem is solutions research to increase consumption of fly ash and slag. Therefore, the research about testing and putting into use of unfired bricks with main components of fly ash and slag can be considered a comprehensive solution, both without causing harm to the environment, without wasting natural materials, and consuming large amounts of fly ash and slag. In this study, the experimental brick mixes were designed using ash and slag to replace part or all of the crushed stone, and the cement was replaced by fly ash in different proportions, of which, the total amount of fly ash and lag used is more than 80% of the total amount of raw materials. The test results show that the characteristics of bricks such as compressive strength, flexural strength, bulk density,... are still satisfactory compared to conventional concrete bricks and traditional clay bricks, and even have more advantages. However, using the standards of concrete bricks or clay bricks to evaluate unfired bricks produced from fly ash and slag, the results are only approximate, because the material composition and production process are different. Therefore, this paper proposes specific technical requirements for unfired bricks produced from fly ash and slag.