Method to improve the soil quality for hydraulic contructions in Thai Binh province by cement and bottom ash

Abstract

     Because it is built of soil, every year, the system of dykes and irrigation canals in Thai Binh province reveals many problems related to insecurity in terms of seepage and stability. Upgrading and repairing requires high costs and difficulties. One of the difficulties comes from the problem of shortage of backfill soils. In Thai Binh province, most of the projects use backfill materials transported from neighboring localities or use sand and then cover with clay. Clay is purchased by the contractor in small quantities in the field, sold by the local people. Annual amount of coal ash of Thai Binh thermal power plant is 570,000 tons. Only about 30% of this amount is recycled, the remaining is discharged to the landfill, causing the landfill to become increasingly overloaded. Faced with that situation, the research to make use of coal ash from thermal power plants in combination with in situ soil to create new materials with mechanical and physical criteria to meet the technical requirements for earth structures is not only scientifically meaningful but also brings economic, environmental and social benefits to Thai Binh province.