Hydraulic cement set-accelerating admixtures incorporating amino acid derivatives
AssigneeW.R. Grace & Co.-Conn.
InventorsAhmad Arfaei, Leslie A. Jardine, Ara Jeknavorian
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Abstract
New set-accelerating admixtures for hydraulic cement compositions are disclosed. These admixtures incorporate set-accelerating compounds and methylol derivatives of amino acids, are found to be surprisingly effective in decreasing the initial set time of hydraulic cements, mortars, and concretes, and are particularly advantageous in reduced-temperature set-accelerators.
Claims44
A cement admixture composition comprising a set-accelerating compound and a first compound of the formula ##STR8## wherein L is a divalent organic linking group, n is 0 or 1, A is an acidic group, R.sup.1 is a methylol group, hydrogen, or a group which is linked to L to form an aliphatic ring structure, and M is either hydrogen or a cation.
The admixture of claim I wherein R.sup.1 of said first compound is hydrogen or a group which is linked to L to form an aliphatic ring structure and said admixture additionally comprises a second compound of said formula (I), wherein R.sup.1 of said second compound is a methylol group.
A cement composition comprising a hydraulic cement, a set-accelerating compound and a first compound of the formula ##STR13## wherein L is a divalent organic linking group, n is 0 or 1, A is an acidic group, R.sup.1 is a methylol group, hydrogen, or a group which is linked to L to form an aliphatic ring structure, and M is either hydrogen or a cation.
A method of accelerating the set of a cement composition comprising adding to a cement composition a set-accelerating compound and a first compound of the formula ##STR16## wherein L is a divalent organic linking group, n is 0 or 1, A is an acidic group, R.sup.1 is a methylol group, hydrogen, or a group which is linked to L to form an aliphatic ring structure, and M is either hydrogen or a cation.
Dependencies are inferred from the claim text.