| 摘要 |
The present invention is the following invention which provides a cement admixture which satisfies fluidity of fresh concrete and high strength of the hardened product of concrete simultaneously. Namely, the present invention resides in a cement admixture which is a mixture of fluorine-containing compounds represented by the formula (1): <paragraph lvl="0"><in-line-formula>Rf-Q1-O-(A1-O)k-R1 (1) </in-line-formula>wherein Rf is a C1-22 polyfluoroaliphatic hydrocarbon group which may contain ethereal oxygen atoms or thioethereal sulfur atoms, Q1 is a C1-5 linear or branched alkylene group, k is an integer of from 1 to 100, A1 is a C2-4 linear alkylene group or a group having at least one hydrogen atom of said alkylene group substituted by a hydrocarbon group which may contain ethereal oxygen atoms, provided that when k is from 2 to 100, the plurality of A1 may be the same or different, and R1 is a hydrogen atom, a C1-18 hydrocarbon group or a C1-18 acyl group, said mixture having a ratio of the weight average molecular weight (Mw) to the number average molecular weight (Mn) (i.e. Mw/Mn) of at least 1.1, and concrete which contains said cement admixture.
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