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US 2021/0147293 A1Published application
Method of reducing stickiness of cementitious compositions
AssigneeGCP Applied Technologies Inc.
InventorsLawrence L. Kuo, Shuqiang Zhang, Hideo Koyata
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Abstract
The present invention provides a method and admixture composition for making hydratable cementitious compositions, ones believed to have much less stickiness in comparison to prior methods. Decreased stickiness in concrete mixes means that they are easier to pour or to cast into place, as well as easier to finish. Dispersant carboxylate polymers of the invention having this ability are characterized by possessing two different, relatively short chain lengths of polyalkyleneoxide units and low weight-average molecular weights.
Claims33
A method for reducing stickiness in a hydratable cementitious composition, comprising:
- combining water, cement, sand aggregates, and stone aggregates to obtain a hydratable cementitious composition, wherein the amount of cement in the hydratable cementitious composition is at least 340 kilograms per cubic meter of concrete, and wherein the weight ratio of water to cement is less than 0.40, and further combining with these components at least one carboxylate copolymer formed from different monomer components designated as components (A), (B), (C), and optionally (D) wherein the components comprise:
- (A) a first polyoxyalkylene monomer represented by structural formula:
- wherein R1 and R2 individually represent hydrogen atom or methyl group;
- R3 represents hydrogen or C(O)OM group wherein M represents a hydrogen atom or an alkali metal;
- AO represents oxyalkylene group having 2 to 4 carbon atoms or mixtures thereof;
- “m” represents an integer of 0 to 2;
- “n” represents an integer of 0 or 1;
- “o” represents an integer of 0 to 4;
- “p” represents an average number of oxyalkylene groups and is an integer from 5 to 35;
- and R4 represents a hydrogen atom or C1 to C4 alkyl group;
- (B) a second polyoxyalkylene monomer represented by structural formula:
- wherein R1 and R2 individually represent hydrogen atom or methyl group;
- R3 represents hydrogen or C(O)OM group wherein M represents a hydrogen atom or an alkali metal;
- AO represents an oxyalkylene group having 2 to 4 carbon atoms or mixtures thereof;
- “m” represents an integer of 0 to 2;
- “n” represents an integer of 0 or 1;
- “o” represents an integer of 0 to 4;
- “q” represents an average number of oxyalkylene groups and is an integer from 20 to 80;
- and R4 represents a hydrogen atom or C1 to C4 alkyl group;
- (C) an unsaturated carboxylic acid monomer represented by structural formula:
- wherein R5 and R6 individually represent hydrogen atom or methyl group;
- R7 represents hydrogen atom, C(O)OM, C(O)OR8, or C(O)NH R8 wherein R8 represents a C1 to C4 alkyl group, and M represents a hydrogen atom or an alkali metal;
- and, optionally,
- (D) an unsaturated, water-soluble monomer represented by structural formula:
- wherein R9, R10, and R11 each independently represent a hydrogen atom, methyl group or C(O)OH;
- X represents C(O)NH2, C(O)NHR12, C(O)NR13R14, —R15, SO3H, C6H4SO3H, or C(O)NHC(CH3)2CH2SO3H, or mixture thereof, wherein R12, R13, R14, and R15 each independently represent a C1 to C alkyl group;
- and
- wherein the molar ratio of component (A) to component (B) is from 15:85 to 85:15, and further wherein the molar ratio of component (C) to the sum of component (A) and component (B) is 90:10 to 50:50;
- and
- wherein the difference between “q” in the second polyoxyalkylene monomer of component (B) and “p” in the first polyoxyalkylene monomer of component (A) is an integer of at least 8.
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A method for reducing stickiness in a hydratable cementitious composition, comprising:
- combining water, cement, sand aggregates, and stone aggregates to obtain a hydratable cementitious composition, wherein the amount of cement in the hydratable cementitious composition is at least 340 kilograms per cubic meter of concrete, and wherein the weight ratio of water to cement is less than 0.40, and further combining with these components at least one carboxylate copolymer formed from different monomer components designated as components (A), (B), (C), and optionally (D) wherein the components comprise:
- (A) a first polyoxyalkylene monomer represented by structural formula:
- wherein R1 and R2 individually represent hydrogen atom or methyl group;
- R3 represents hydrogen or C(O)OM group wherein M represents a hydrogen atom or an alkali metal;
- AO represents oxyalkylene group having 2 to 4 carbon atoms or mixtures thereof;
- “m” represents an integer of 0 to 2;
- “n” represents an integer of 0 or 1;
- “o” represents an integer of 0 to 4;
- “p” represents an average number of oxyalkylene groups and is an integer from 5 to 35;
- and R4 represents a hydrogen atom or C1 to C4 alkyl group;
- (B) a second polyoxyalkylene monomer represented by structural formula:
- wherein R1 and R2 individually represent hydrogen atom or methyl group;
- R3 represents hydrogen or C(O)OM group wherein M represents a hydrogen atom or an alkali metal;
- AO represents an oxyalkylene group having 2 to 4 carbon atoms or mixtures thereof;
- “m” represents an integer of 0 to 2;
- “n” represents an integer of 0 or 1;
- “o” represents an integer of 0 to 4;
- “q” represents an average number of oxyalkylene groups and is an integer from 25 to 80;
- and R4 represents a hydrogen atom or C1 to C4 alkyl group;
- (C) an unsaturated carboxylic acid monomer represented by structural formula:
- wherein R5 and R6 individually represent hydrogen atom or methyl group;
- R7 represents hydrogen atom, C(O)OM, C(O)OR8, or C(O)NH R8 wherein R8 represents a C1 to C4 alkyl group, and M represents a hydrogen atom or an alkali metal;
- and, optionally,
- (D) unsaturated, water-soluble monomer represented by structural formula:
- wherein R9, R10, and R11 each independently represent a hydrogen atom, methyl group or C(O)OH;
- X represents C(O)NH2, C(O)NHR12, C(O)NR13R14, —R15, SO3H, C6H4SO3H, or C(O)NHC(CH3)2CH2SO3H, or mixture thereof, wherein R12, R13, R14, and R15 each independently represent a C1 to C5 alkyl group;
- and
- wherein the molar ratio of component (A) to component (B) is from 15:85 to 85:15, and further wherein the molar ratio of component (C) to the sum of component (A) and component (B) is 90:10 to 50:50;
- and
- wherein the difference between “q” in the second polyoxyalkylene monomer of component (B) and “p” in the first polyoxyalkylene monomer of component (A) is an integer of at least 8.
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Dependencies are inferred from the claim text.