Cementitious compositions
First Claim
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1. A homogeneous uncured cementitious composition which comprises the ingredients:
- a. a hydraulic cement selected from the group consisting of cements which comprise compounds of calcium, aluminum, silicon, oxygen and/or sulfur which set and harden by reaction with water,b. water, andc. a water-dispersible polymer, whereini. the ratio of water to hydraulic cement is in the range 15 - 28 parts by weight of water to 100 parts by weight of hydraulic cement;
ii. the ratio of water-dispersible polymer to hydraulic cement is in the range 0.1 - 3.0 parts by weight of water dispersible polymer to 100 parts by weight of hydraulic cement; and
iii. the water-dispersible polymer is selected, with reference to the hydraulic cement and to the selected proportions of polymer and water, for its suitability to facilitate homogenization and to yield on homogenization an uncured composition which can be shaped under pressure and which is shape retaining,and wherein the ingredients (a), (b) and (c) have been subjected to a homogenization process of dispersion and homogenization so that they are regularly dispersed throughout the composition;
such that on curing and drying, the homogeneous uncured composition yields a cured and dried cementitious composition having a modulus of rupture greater than 15 MN/m2.
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Abstract
Cured cementitious compositions having a modulus of rupture of greater than 15 MN/m2 are prepared by curing and drying a homogeneous uncured cementitious composition which comprises in defined proportions hydraulic cement, water and a selected water-dispersible polymer.
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32 Claims
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1. A homogeneous uncured cementitious composition which comprises the ingredients:
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a. a hydraulic cement selected from the group consisting of cements which comprise compounds of calcium, aluminum, silicon, oxygen and/or sulfur which set and harden by reaction with water, b. water, and c. a water-dispersible polymer, wherein i. the ratio of water to hydraulic cement is in the range 15 - 28 parts by weight of water to 100 parts by weight of hydraulic cement; ii. the ratio of water-dispersible polymer to hydraulic cement is in the range 0.1 - 3.0 parts by weight of water dispersible polymer to 100 parts by weight of hydraulic cement; and iii. the water-dispersible polymer is selected, with reference to the hydraulic cement and to the selected proportions of polymer and water, for its suitability to facilitate homogenization and to yield on homogenization an uncured composition which can be shaped under pressure and which is shape retaining, and wherein the ingredients (a), (b) and (c) have been subjected to a homogenization process of dispersion and homogenization so that they are regularly dispersed throughout the composition;
such that on curing and drying, the homogeneous uncured composition yields a cured and dried cementitious composition having a modulus of rupture greater than 15 MN/m2. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 31, 32)
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- 26. A cured and dried cementitious composition comprising cured hydraulic cement and a water-dispersible polymer which has a modulus of rupture greater than 15 MN/m2.
Specification