Use of Coal Bottom Ash as Mechanical Stabiliser in Subgrade Soil

Table 1

Laboratory tests carried out and standards used.

Test and standard	Samples on which tests were carried out
	Subgrade soil	Coal bottom ash	Mixture of subgrade soil and bottom ash
Particle size distribution; BS 1377-2:1990	√	√	√; (only for mixture containing 30% by weight of CBA)
Particle density; BS 1377-2:1990	√	√
Atterberg limits; BS 1377-2:1990	√		√; (only for mixture containing 30% by weight of CBA)
Heavy proctor test; BS 1377:4:1990	√		√ (for all mixtures)
California bearing ratio; BS 1377:4:1990	√		√ (for all mixtures)
Loss on ignition; BS 1377-3:1990		√