4 cubic foot of pea sized medium shale measure 2 6 cubic feet of crushed fine shale mix the lumnite u00ae cement pea sized medium shale and crushed fine shale together to create a dry mix measure an amount of water equal to 0 4 times the weight of the one cubic foot of lumnite u00ae cement add the amount of water to the dry mix to create saggregate u2122 concrete mix handle pour cure and treat the saggregate u2122 concrete like conventional concrete in the context of the present invention saggregate u2122 concrete is used with suitable molds to form the desired hopper burn chamber assembly capable of withstanding the heat of burning and molten sulphur in use 0070 component amount lumnite u00ae cement one volume unit pea sized medium shale one volume unit crushed fine shale 2 0 u00d7 one volume unit water 4 u00d7 weight of one volume unit of lumnite u00ae for example one cubic foot of lumnite u00ae cement is measured and weighed the weight of one cubic foot of lumnite u00ae cement being noted measure one cubic foot of pea sized medium shale measure two cubic feet of crushed fine shale mix the lumnite u00ae cement pea sized medium shale and crushed fine shale together to create a dry mix measure an amount of water equal to 0 4 times the weight of the one cubic foot of lumnite u00ae cement add the amount of water to the dry mix to create saggregate u2122 concrete mix handle pour cure and treat the saggregate u2122 concrete like conventional concrete in the context of the present invention saggregate u2122.