Controlled hydration of quicklime
AssigneeGCP Applied Technologies Inc.
InventorsZen Chun, Klaus-Alexander Rieder, Ezgi Yurdakul, Antonio J. Aldykiewicz
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Abstract
The present invention provides a liquid composition of quicklime particles within an alkylene glycol-based paste or slurry environment, which allows for pumpability and meterability of a liquid composition into cementitious materials such as concrete and mortar. Treated quicklime particles of the present invention manifest an unexpected and surprising hydration induction postponement behavior, as demonstrated through calorimetric testing.
Claims23
An exemplary composition of the invention for controlling hydration of quicklime, comprises:
- a liquid paste or slurry formed from (A) quicklime particles comprising calcium oxide in the amount of 45-100% by dry weight based on the total weight of the quicklime particles;
- and (B) an organic liquid comprising an alkylene glycol, wherein the quicklime particles and alkylene glycol are present within the composition in an A:B weight ratio of 80:20 to 30:70, the alkylene glycol forming a liquid paste or slurry of the quicklime particles;
- and further wherein the organic liquid of component (B) comprises water in the amount of 0.1% to 10% percent based on the weight of the quicklime particles of component (A).
A method for treating quicklime, comprising:
- combining quicklime particles with an organic liquid composition comprising an alkylene glycol, wherein the quicklime particles and alkylene glycol are present within the liquid composition in an A:B weight ratio of 80:20 to 30:70, to provide a paste or slurry that is pumpable and meterable as a liquid into concrete or mortar;
- and further wherein, after dispersing the quicklime particles within an alkylene-glycol environment to form a paste or slurry, the method further comprises exposing the surface of the quicklime particles within the alkylene glycol paste or slurry environment to a carbonation agent or carboxylation agent to form around the quicklime particles a protective barrier of carbonyl-containing or carboxyl-containing byproduct within a liquid organic environment.
A hardened cementitious material, concrete, or mortar, substantially free of shrinkage crack up to the age of 28 days, including a quicklime composition prepared prior to mixing in said cementitious material, concrete or mortar, which comprises:
- (A) quicklime particles comprising calcium oxide in the amount of 45-100% by dry weight based on the total weight of the quicklime particles;
- and (B) an organic liquid comprising an alkylene glycol, wherein the quicklime particles and alkylene glycol are present within the composition in an A:B weight ratio of 80:20 to 30:70.
Dependencies are inferred from the claim text.