id	keyword
ap-7289	± ±
ap-7289	cement
ap-7289	clay
ap-7289	hcwpan
ap-7289	soil
ap-7289	strength
ap-7289	samples
ap-7289	journal
ap-7289	waste
ap-7289	properties
ap-7289	water
ap-7289	paper
ap-7289	materials
ap-7289	ash
ap-7289	content
ap-7289	building
ap-7289	clay soil
ap-7289	energy