2015-7-29 · 10-20 % of the municipal solid waste (excluding large construction projects). Fig 7: Construction and demolition waste[17] 2.8 CRUSHED SPENT FIRE BRICKS (CSFB) Fire bricks are the products manufactured (as per IS: 6 and IS: 8 specifications) from refractory grog, plastic, and non plastic clays of high purity.