Compositions: coating or plastic – Coating or plastic compositions – Inorganic settable ingredient containing
Patent
1996-08-22
1998-02-24
Marcantoni, Paul
Compositions: coating or plastic
Coating or plastic compositions
Inorganic settable ingredient containing
106724, 106728, 106802, 106823, 524 5, C04B 2404
Patent
active
057208077
DESCRIPTION:
BRIEF SUMMARY
FIELD OF INDUSTRIAL APPLICATION
The present invention relates to a hydraulic composition having a high flowability and no need of compaction. More particularly, the present invention relates to a hydraulic composition capable of increasing the viscosities and flowabilities of concrete, mortar and paste to be used as a construction material and a secondary product material and having an excellent resistance to segregation caused by aggregate, cement and water, and no need of compaction through vibration with a vibrator or the like.
PRIOR ART
The conventional method of placing a concrete composition generally comprises supplying concrete into a form wherein reinforcing steel bars are disposed, and compacting the concrete through vibration with a vibrator. However, noise pollution caused by the vibrator during concrete placing and a lack of manpower in the concrete industry have recently become problems.
In order to solve these problems, investigations into self-packing concrete which can dispense with vibration compaction have started, but the fact is that no such self-packing concrete is yet to be technologically put into practical use.
In Japanese Patent Laid-Open No. 85,788/1993, there has been proposed a self-packing concrete composition wherein use is made of a superplasticizer and a water-soluble polymer having an alkylene oxide chain. This concrete composition, though excellent in segregation resistance and self-packing properties just after being prepared, involves the problem of a decrease in self-packing properties with time.
DISCLOSURE OF THE INVENTION
In view of the foregoing, the inventors of the present invention have made intensive investigations with a view to solving the above-mentioned problem to find a self-packing concrete composition having high flowability, high aggregate segregation resistance, and reduced in the lowering of self-packing properties even after the lapse of time. The present invention has been completed based on this finding.
Specifically, in accordance with the present invention, there is provided a hydraulic composition characterized by comprising: to 2,000 mol of added alkylene oxide units in the molecule and having the molecular terminals thereof rendered hydrophobic; most 5,000;
In accordance with the present invention, there is also provided a hydraulic composition characterized by comprising a water-soluble polymer in the form of a polyalkylene oxide derivative having a hydroxyl value of at most 50 KOH-mg/g in terms of terminal hydroxyl groups rendered hydrophobic; a thickening accelerator having a weight-average molecular weight of at most 5,000; a superplasticizer; and a hydraulic powder. In this embodiment of the present invention, the polyalkylene oxide derivative is preferably a reaction product prepared from an alkylene oxide adduct of a monohydric alcohol having 6 to 30 carbon atoms in the molecule, a monovalent mercaptan having 6 to 30 carbon atoms in the molecule or an alkylphenol having 6 to 30 carbon atoms in the molecule with 10 to 1,000 mol of an alkylene oxide, and a compound having 2 to 6 epoxy groups, a dicarboxylic acid, a dicarboxylic acid anhydride or a diisocyanate; a reaction product prepared from an epoxy compound having 6 to 30 carbon atoms, a fatty acid having 6 to 30 carbon atoms or an alkyl isocyanate having 6 to 30 carbon atoms, and a polyalkylene oxide prepared by polymerizing 10 to 2,000 mol of an alkylene oxide; or a reaction product prepared by reacting at least one member selected from the group consisting of compounds having 2 to 6 epoxy groups, dicarboxylic acids, dicarboxylic acid anhydrides and diisocyanates with a polyalkylene oxide prepared by polymerizing 10 to 2,000 mol of an alkylene oxide, and then reacting the resulting product with an epoxy compound having 6 to 30 carbon atoms, a fatty acid having 6 to 30 carbon atoms or an alkyl isocyanate having 6 to 30 carbon atoms.
Where the hydraulic composition of the present invention is used as a concrete which can dispense with compaction, the slump flow value thereof mus
REFERENCES:
patent: 4946901 (1990-08-01), Akimoto et al.
Izumi Tatsuo
Kurara Akira
Murahara Shin
Yamamuro Hotaka
Kao Corporation
Marcantoni Paul
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