HYSON-CELLS

	Application and method	Estimated installed cost			Estimated installed cost
		S A Rand			US Dollars			unit
Velocities 0-6 m / sec

	Hyson Cells
	20 MPa concrete. 100 mm to 250 mm thick	R35	to	R90	$6	to	$15	/ m²



	Concrete slabs	R150	to	R350	$25	to	$58	/ m²
	Rubber jointing. Subsurface drainage. Uses shuttering. Not flexible therefore fails if movement of underlying material.

	Concrete blocks	R85	to	R180	$14	to	$30	/ m²
	Blocks are secured with wire therefore potential rust problem. Needs non woven layer underneath.

	Reno mattresses filled with stone	R125	to	R250	$21	to	$42	/ m²


	Concrete filled cloth mattresses	R85	to	R110	$14	to	$18	/ m²
	UV breaks down the cloth. Not flexible

Velocities 6 to 18 m / sec

	Hyson Cells
	30 MPa to 40 MPa concrete in cells 150 mm to 250 mm deep.	R75	to	R125	$13	to	$21	/ m³

	Reinforced concrete with dowels	R175	to	R400	$29	to	$67	/ m³
	Also needs jointing. Shuttering. Subsurface drainage.

	Concrete steps	R450	to	R600	$75	to	$100	/ m³
	Needs shuttering, reinforcement, subsurface drainage

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