SPECIFICATION
U Drain Size: 500mm(W) X 450mm(H) X 75mm thk Concrete Base
BRC A7
Reinforce Concrete Grating Y12
Porous Grooveline (size 400mm X 600mm X 75mm thk)
Mix Design
Grade 25 concrete
"Mix Materials 10mm aggregate.course sand, water/cement. fly ash content for projected strength at 28 days.