Compositions: coating or plastic – Coating or plastic compositions – Inorganic settable ingredient containing
Patent
1996-05-17
1998-11-24
Marcheschi, Michael
Compositions: coating or plastic
Coating or plastic compositions
Inorganic settable ingredient containing
106727, 106728, 106724, 106808, 106810, 106819, 106823, 524 2, 524 5, 524650, 5253299, 526262, 528322, C04B 2208, C04B 2404
Patent
active
058401148
ABSTRACT:
A high early strength admixture for precast hydraulic cement comprises a calcium salt and a copolymer having a carbon-containing backbone to which are attached cement-anchoring members, such as carboxyl groups, and to which are also attached oxyalkylene pendant groups by linkages selected from the group consisting of amide and imide members. The copolymers used are preferably formed by reacting an acrylic polymer with ammonia or an alkoxylated amine. The calcium salt, preferably calcium nitrite, and the copolymer can be added simultaneously as one admixture, or separately. The invention relates also to methods for enhancing high early strength in concrete, cement, masonry, and mortar mixtures generally, and to precast concrete particarly, and also pertains to such hydraulic mixtures containing the calcium salt and copolymer.
REFERENCES:
patent: 4496506 (1985-01-01), Arfaei et al.
patent: 5393343 (1995-02-01), Darwin et al.
patent: 5527388 (1996-06-01), Berke et al.
patent: 5531825 (1996-07-01), Gartner
Arfaei Ahmad
Berke Neal Steven
Darwin David Charles
Gartner Ellis Martin
Jardine Leslie Ann
Baker William L.
Leon Craig K.
Marcheschi Michael
W. R. Grace & Co.,-Conn.
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