Shrinking Reducing Agent
AssigneeConstruction Research & Technology GmbH
InventorsRaita Iwata, Tomomi Sugiyama, Takumi Sugamata
Life of this patent
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Abstract
To provide shrinkage reducing agents which render excellent shrinkage reducing effect and frost-thaw resistance to cement compositions such as mortar and concrete without entraining excessive air, and exhibit excellent solution stability. The shrinkage reducing agent comprises a (poly)alkylene compound having an unsaturated bond represented by the formula (1): R2O—R1—O-(A1O)n—R3 (1) -(A2O)m—R4 (2) (wherein R1 is a C2-10 hydrocarbon group having an unsaturated bond; R2 is hydrogen or the formula (2); R3 and R4 are each independently hydrogen or a C1-8 alkyl group; A1O and A2O are one or more kinds of C2-4 oxyalkylene groups; and n and m are mean addition numbers of moles of A1O and A2O, respectively, and 1 to 20).
Claims16
A shrinkage reducing agent comprising a (poly)alkylene compound having an unsaturated bond represented by the formula (1):
- R2O—R1—O-(A1O)n—R3 (1)
- -(A2O)m—R4 (2)
- wherein R1 is a C2-10 hydrocarbon group having an unsaturated bond;
- R2 is hydrogen or the formula (2);
- R3 and R4 are each independently hydrogen or a C1-8 alkyl group:
- A1O and A2O are one or more kinds of C2-4 oxyalkylene groups;
- and n and m are mean addition numbers of moles of A1O and A2O, respectively, and 1 to 20.
A method of adding a cement admixture to a cement composition comprising adding to the cement composition a (poly)alkylene compound having an unsaturated bond represented by the formula (1) as a shrinkage reducing agent:
- R2O—R1—O-(A1O)n—R3 (1)
- —(A2O)m—R4 (2)
- (wherein R1 is a C2-10 hydrocarbon group having an unsaturated bond;
- R2 is hydrogen or the formula (2);
- R3 and R4 are each independently hydrogen or a C1-8 alkyl group;
- A1O and A2O are one or more kinds of C2-4 oxyalkylene groups;
- and n and m are mean addition numbers of moles of A1O and A2O, respectively, and 1 to 20).
(canceled)
Dependencies are inferred from the claim text.