Controlled release of chemical admixtures
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United States of America Patent
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Mar 26, 2013
Grant Date -
Apr 14, 2011
app pub date -
Dec 16, 2010
filing date -
Aug 1, 2005
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Abstract
A method of controlling release of an admixture in a cement-based composition involves intercalating an admixture (e.g. an accelerator, a set retarder, a superplasticizer) for the cement-based composition into a layered double hydroxide or mixture thereof. A cement-based composition prepared in such a manner and containing a cement-based material (e.g. cement, mortar or concrete) has better workability, especially in respect of slump-loss characteristics.
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