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US 4,537,796 AGranted
Method for treating the surface of a concrete slab
OwnerRomain J. B. Buys, Jean-Aime Manouvrierinventors
Life of this patent
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Abstract
In a method of roughening the surface of a concrete slab for roads to provide anti-skid properties, an agent for retarding the setting of the concrete is distributed over the slab which has been recently laid and a water-impermeable sheet of plastics material is spread over the upper surface simultaneously with the spraying operation. After the underlying or subjacent layer of concrete has set, the plastic sheet is lifted away and the still soft upper layer of concrete is removed by brushing and spraying with pressurized water.
Claims7
A method of chemically stripping a concrete slab, comprising the steps of:
- distributing an agent for retarding the setting of an upper layer of mortar on the surface of a freshly laid concrete slab by spraying said agent from a row of nozzles, simultaneously spreading a water-impermeable sheet of plastics material over said upper layer immediately upstream of said spraying nozzles, and, as soon as the concrete in a layer subjacent to said upper layer has set, removing said sheet, then removing said upper layer of mortar whose setting has been retarded from between surface aggregates in the concrete by simultaneously brushing and spraying with pressurized water.
Dependencies are inferred from the claim text.