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    <managingEditor>tris-trb@nas.edu (Bill McLeod)</managingEditor>
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      <title>KANSAS WATER-CEMENT RATIO METER: PRELIMINARY RESULTS</title>
      <link>https://trid.trb.org/View/467949</link>
      <description><![CDATA[The water-cement ratio of fresh concrete is recognized as the one factor that affects the strength and durability of an adequately compacted concrete mix.  Although water-cement ratio is the predominant factor affecting strength of hardened concrete, currently no widely used, reliable method is available for measuring water-cement ratio in the field.  A prototype device has been developed to measure the water-cement ratio of a plastic concrete mix.  The method is based on the measurement of turbidity of water-cement slurry separated out of a concrete mixture by pressure sieving.  Consistent results were obtained for air-entrained and non-air-entrained concrete.  Statistical analyses of the test results have shown that this meter can measure the water-cement ratio of fresh concrete with an accuracy of +/-0.01 on the water-cement ratio scale for a single test at a 90% confidence interval.  The equipment will cost less than $10,000.  If the method works as well in the field as it does in the laboratory, accurate determination of water-cement ratio could dramatically improve the ability of the concrete industry to ensure the quality of concrete construction.]]></description>
      <pubDate>Tue, 22 Oct 1996 00:00:00 GMT</pubDate>
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