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	<title>The Constructor &#187; AAR</title>
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		<title>Deleterious Substances in Aggregate- Alkali-Aggregate Reactions</title>
		<link>http://theconstructor.org/2009/12/deleterious-substances-in-aggregate-alkali-aggregate-reactions/</link>
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		<pubDate>Sun, 20 Dec 2009 05:38:20 +0000</pubDate>
		<dc:creator>Gopal Mishra</dc:creator>
				<category><![CDATA[AAR]]></category>
		<category><![CDATA[Concrete]]></category>

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		<description><![CDATA[Deleterious Substances in Aggregate- Alkali-Aggregate Reactions Organic Impurities Organic impurities interfere with the hydration reaction Organic matter are mostly found in sand and consists usually of products of decay of vegetable matter (mainly tannic acid and its derivatives) Organic matter may removed from sand by washing To determine the organic content of aggregate, colorimetric test [...]

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