Concrete admixture
AssigneeFujisawa Pharmaceutical Co., Ltd.
InventorsHideo Yagi, Toru Takeuchi
Life of this patent
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Abstract
The invention relates to an admixture to be used in preparing a fresh concrete with enhanced flowability and air-entraining property.
Claims4
An admixture to be used in preparing a fresh concrete, which comprises 90 to 95 parts by weight of component A comprising a copolymer prepared by polymerizing 10 to 95 parts by weight of a compound of the general formula:
- ##STR13## wherein R.sup.1 is hydrogen or methyl, R.sup.2 is lower(C2 to C4) alkylene, R.sup.3 is hydrogen or lower(C1 to C5) alkyl and l is an integer of 1 to 100, and 90 to 5 parts by weight of a compound of the general formula:
- ##STR14## wherein R.sup.4 is hydrogen or methyl, or a salt thereof, 0.05 to 5 parts by weight of component B comprising a compound of the general formula:
- ##STR15## wherein R.sup.5 is hydrogen or alkanoyl, R.sup.6 is hydrogen or alkyl, m is an integer of 1 to 99 and n is an integer of 1 to 15, and further wherein m+n is an integer of 2 to 100 and the units ##STR16## appear randomly, and 0.01 to 10 parts by weight of component C comprising at least one compound selected from the group consisting of polyoxyethylene alkyl ether sulfate or polyoxyethylene alkylphenyl ether sulfate or a salt thereof, polyoxyethylene alkyl ether phosphate or polyoxyethylene alkylphenyl ether phosphate or a salt thereof, and alkylbenzenesulfonic acid or a salt thereof.
A method of preparing a fresh concrete which comprises adding per cement 0.001 to 1.0 percent by weight of a concrete admixture which comprises 90 to 95 parts by weight of component A comprising a copolymer prepared by polymerizing 10 to 95 parts by weight of a compound of the general formula:
- ##STR25## wherein R.sup.1 is hydrogen or methyl, R.sup.2 is lower(C2 to C4) alkylene, R.sup.3 is hydrogen or lower(C1 to C5) alkyl and l is an integer of 1 to 100, and 90 to 5 parts by weight of a compound of the general formula:
- ##STR26## wherein R.sup.4 is hydrogen or methyl, or a salt thereof, 0.05 to 5 parts by weight of component B comprising a compound of the general formula:
- ##STR27## wherein R.sup.5 is hydrogen or alkanoyl, R.sup.6 is hydrogen or alkyl, m is an integer of 1 to 99 and n is an integer of 1 to 15, and further wherein m+n is an integer of 2 to 100 and the units ##STR28## appear randomly, and 0.01 to 10 parts by weight of component C comprising at least one compound selected from the group consisting of polyoxyethylene alkyl ether sulfate or polyoxyethylene alkylphenyl ether sulfate or a salt thereof, polyoxyethylene alkyl ether phosphate or polyoxyethylene alkylphenyl ether phosphate or a salt thereof, and alkylbenzenesulfonic acid or a salt thereof.
Dependencies are inferred from the claim text.