Durability improving agent for cement-hydraulic-set substances, method of improving same, and cement-hydraulic-set substances improved in durability
AssigneesFujisawa Pharmaceutical Co., Ltd., Takenaka Corporation, Nippon Nyukazai Co., Ltd.
InventorsMasaharu Sakuta, Toshio Saito, Kunio Yanagibashi
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Abstract
The present invention provides a method for improving the durability of cement-hydraulic substances, the method decreasing the dry shrinkage of cement-hydraulic-set substances such as concrete, mortar or related substances, and increasing resistance to a repetition of the freezing and thawing of the cement-hydraulic-set substances, by the use of terminal alkyletherified compounds or terminal alkylesterified compounds of polymers having --C.sub.2 H.sub.5 O-- and/or --C.sub.3 H.sub.6 O-- as a repetitive unit.
Claims8
A method for improving the durability of cement-hydraulic substances, which comprises mixing 0.1 to 8.0 parts by weight of a durability improving agent with 100 parts by weight of cement, followed by setting, wherein said durability improving agent comprises a compound of the formula:
- R--O--Z--H
- wherein R denotes an alkyl group having 9 to 18 carbon atoms, alkanoyl group having 8 to 19 carbon atoms or alkenoyl group having 8 to 19 carbon atoms, and Z denotes a group in which none or a whole number of --C.sub.2 H.sub.4 O-- radicals are bonded to none or a whole number of --C.sub.3 H.sub.6 O-- radicals in random order, the group containing at least one --C.sub.2 H.sub.4 O-- radical, or at least one --C.sub.3 H.sub.6 O-- radical, or both said radicals, with the proviso that:
- (1) in the case of a single adduct or polymer of ethylene oxide, the number of --C.sub.2 H.sub.4 O-- radicals is 1 to 4,
- (2) in the case of a single adduct or polymer of propylene oxide, the number of --C.sub.3 H.sub.6 O-- radicals is 1 to 30,
- (3) in the case of a block copolymer or random copolymer of ethylene oxide and propylene oxide, the total number of --C.sub.2 H.sub.4 O-- radicals and --C.sub.3 H.sub.6 O-- radicals is 2 to 30, and the mole ratio of --C.sub.2 H.sub.4 O--/--C.sub.3 H.sub.6 O-- is less than 1.0.
Cement-hydraulic substances improved in durability, wherein 0.1 to 8.0 parts by weight of a durability improving agent is contained in 100 parts by weight of cement, said durability improving agent comprising a compound of the formula
- R--O--Z--H
- wherein R denotes an alkyl group having 9 to 18 carbon atoms, alkanoyl group having 8 to 19 carbon atoms or alkenoyl group having 8 to 19 carbon atoms, and Z denotes a group in which none or a whole number of --C.sub.2 H.sub.4 O-- radicals are bonded to none or a whole number of --C.sub.3 H.sub.6 O-- radicals in random order, the group containing at least one --C.sub.2 H.sub.4 O-- radical, or at least one --C.sub.3 H.sub.6 O-- radical, or both said radicals, with the proviso that:
- (1) in the case of a single adduct or polymer of ethylene oxide, the number of --C.sub.2 H.sub.4 O-- radicals is 1 to 4,
- (2) in the case of a single adduct or polymer of propylene oxide, the number of --C.sub.3 H.sub.6 O-- radicals is 1 to 30,
- (3) in the case of a block copolymer or random copolymer of ethylene oxide and propylene oxide, the total number of --C.sub.2 H.sub.4 O-- radicals and --C.sub.3 H.sub.6 O-- radicals is 2 to 30, and the mole ratio of --C.sub.2 H.sub.4 O--/--C.sub.3 H.sub.6 O-- is less than 1.0.
Dependencies are inferred from the claim text.