Self-levelling cementitious mixes
OwnerLeslie W. Cheriton, Philip J. Ansellinventors
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Abstract
A self-levelling cementitious mix, especially a screeding mix comprises high alumina cement and portland cement in non-critical proportions together with sufficient plasticizer and set retarder to make the mix workable in an acceptable setting period. Preferable proportions of the cement are 20-80:80-20 most advantageously 50:50.
Claims14
A self-levelling screeding composition in the form of a free flowing paste, said composition comprising sand and other fillers, water, and hydraulic cement component comprising a portland cement and a high alumina cement characterized in that the cements are present in a weight ratio of 20-80:80-20 and in that the composition further includes a plasticiser component in a weight ratio of about 1% of the cement component to make the mix workable and sufficient of a set retarder component to delay the initial setting time about one hour.
A method of levelling the surface of a floor, comprising applying to the floor a paste of water and self levelling cementitious composition, the composition comprising:
- sand and like fillers,
- a hydraulic cement component comprising
- a portland cement and a high alumina cement, the cements being present in a weight ratio of 20-80:80-20,
- a plasticiser component in a weight ratio of about 1% of the cement,
- a set retarder component in a proportion to make the initial set time of the composition be about one hour, the water being added in a proportion to form a free flowing paste, the paste being applied to a maximum thickness of about 3 mm and an average thickness of about 1.5 mm, and allowing the paste to set.
Dependencies are inferred from the claim text.