Application of Coal Ash to Postmine Land for Prevention of Soil Erosion in Coal Mine in Indonesia: Utilization of Fly Ash and Bottom Ash

Table 3

The Atterberg limits of the simulated topsoil mixed with the coal ash at the mixing ratio of 0%, 30%, 60%, and 100%.

	Liquid limit ()	Plastic limit ()	Plasticity index ()
Topsoil (0%)	18.6	34.4	15.8
FA1-30	ND	ND	ND
FA1-60	ND	ND	ND
FA1-100	ND	ND	ND
BA1-30	ND	ND	ND
BA1-60	ND	ND	ND
BA1-100	ND	ND	ND
FA2-30	ND	14.1	ND
FA2-60	ND	ND	ND
FA2-100	ND	ND	ND