Process for preparing frost resistant concrete
AssigneeAkzo N.V.
InventorPoppe de Rook
Life of this patent
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Abstract
A process is provided for making frost resistant cement products having improved 28 day compressive strengths wherein a gas is included in the product by substantially uniformly dispersing hollow gas filled synthetic polymeric spheres in the cement mixture prior to setting thereof. The invention also provides a frost resistant cement product having from about 0.01 to about 0.1% by weight based on the weight of cement of synthetic polymer spheres filled with air and having a diameter of from about 10 to about 100 .mu.m substantially uniformly dispersed therein.
Claims12
In a process for the preparation of a frost resistant concrete, in which process a volume percentage of gas in a finely divided form is incorporated in a fresh concrete mixture which is subsequently allowed to cure, the improvement which comprises adding the gas to the mixture while it is entrapped in spheres of a synthetic polymer which is inert under the curing conditions, the dimensions of the spheres being in the range of about 10 to 100 .mu.m and the amount in which they are added in the range of 0.01 to 0.1% by weight, calculated on the dry cement weight.
A frost resistant cement based product having from about 0.01 to about 0.1% by weight based on the weight of cement of synthetic polymer spheres filled with air and having a diameter of from about 10 to about 100 .mu.m substantially uniformly dispersed therein.
A process for improving the frost resistance of a cement based product which comprises mixing with a cement mix prior to setting from about 0.01% to about 0.1% by weight calculated on the weight of dry cement of spheres of a synthetic polymer containing an inert gas, said spheres having a cross-section of from about 10 to about 100 .mu.m and being inert to the cement product.
Dependencies are inferred from the claim text.