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Primary Examiner: Rutledge, L. Dewayne
Assistant Examiner: Sheehan, John P.
Attorney: Noe; Alphonse R.

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Title: Method and composition for controlling contraction in setting cementitious systems through the addition of gas generating agents

Abstract: The contraction of aqueous hydraulic cement mixtures is controlled by the addition thereto of a gas generating agent capable of generating gas in the mixture without the addition of activators or other agents. Gas generation may be controlled over an extended period of time so that even slow setting cementitious mixtures may have their shrinkage or contraction inhibited during setting and hardening.

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Inventors: Gaines, Robert W. (Darien, CT, US)

Application Number: 612239
Filing Date: 1975-09-11
Publication_date: 1979-03-06
Assignee: Construction Products Research, Inc. (Old Greenwich, CT)
Primary Class(es): 106/673 106/122, 106/677, 106/678
Other Classes:
US Patent Ref:

2626933	Jan, 1953	Lober	106/122.
2930771	Mar, 1960	Wade	106/87.
3062669	Nov, 1962	Dilnot	106/87.
3330675	Jul, 1967	Magder	106/87.
3591394	Jul, 1971	Diggelmann et al.	106/87.
3608060	Sep, 1971	Osment et al.	106/87.
3625724	Dec, 1971	Alvero	106/87.
3794504	Feb, 1974	Babcock	106/87.

Other Refs: Other References: The Condensed Chemical Dictionary; 8th ed., Van Nostrand Reinhold Co., 1968, p. 192.
The American College Dictionary; Random House Inc., 1970, p. 194.
The Merck Index; 8th ed., Merck & Co. Inc., 1968, p. 955.
The Condensed Chemical Dictionary; 8th ed., Van Nostrand Reinhold Co. 1968 p. 87.