Utilization of lime sludge waste from paper mills for the production of unburn bricks

Abstract

ABSTRACT:
The development of the production of environmentally friendly sustainable materials based on the utilization of industrial wastes has been concerned by many researchers and encouraged to develop in many countries. This paper presents the results of research on utilizing lime sludge waste in the pulp and paper industry in combination with other industrial waste to produce unburnt concrete bricks. This brick has a low production costs and to minimize the environmental impacts of both paper production and the unburnt bricks manufacturing. The mechanical properties of the brick samples were studied include moisture content, density, water absorption, and compressive strength. The results show that, when the content of lime sludge increases, the compressive strength and density decrease, while the water absorption and forming moisture increase. It is completely possible to produce grade 5 to 10- grade concrete bricks according to TCVN 6477: 2016 and has a production price equivalent to that of normal concrete bricks.

Keywords: Unburt brick (UB), Concrete brick (CB); Lime Sludge Waste (LSW); Ground Granulated Blast furnace Slag (GGBS); Industrial Waste (IW).