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    <managingEditor>tris-trb@nas.edu (Bill McLeod)</managingEditor>
    <webMaster>tris-trb@nas.edu (Bill McLeod)</webMaster>
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      <title>DYNAMIC NON DESTRUCTIVE TESTING OF STRUCTURES. APPLICATION TO THE DETECTION OF DEFECTS IN ENGINEERING STRUCTURES</title>
      <link>https://trid.trb.org/View/1071888</link>
      <description><![CDATA[EXPERIENCE HAS SHOWN THAT THE COMPRESSIVE AND TENSILE STRENGTH, MEASURED ON SAMPLES PREPARED AT THE TIME OF CONSTRUCTION OF A STRUCTURE AND KEPT IN  UNSATISFACTORY CONDITIONS, WAS NOT ALWAYS REPRESENTATIVE OF THAT OF THE ORIGINAL STRUCTURE. NON DESTRUCTIVE TESTING CAN HELP THE ENGINEER TO EVALUATE ACCURATELY CONCRETE QUALITY IN THE STRUCTURE ITSELF, EVEN AS REGARDS CONCRETE HOMOGENEITY, LOCALISATION OF POSSIBLE DEFECTS (PRESENCE OF FOREIGN  BODIES, CRACKS, LACK OF COMPACTION, RESUMPTION OF CONCRETING), AND EVALUATION OF COMPRESSIVE STRENGTH AT A YOUNG AGE (E.G. BETWEEN ONE AND TEN DAYS THE ACCURACY IS HIGHLY SATISFACTORY). THREE EXAMPLES ILLUSTRATE THE TECHNIQUES DESCRIBED.]]></description>
      <pubDate>Sun, 21 Nov 2010 13:11:13 GMT</pubDate>
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      <title>EFFECTS OF MINERAL ADMIXTURE ON PROPERTIES OF YOUNG CONCRETE</title>
      <link>https://trid.trb.org/View/665236</link>
      <description><![CDATA[This paper reports the results of an experimental study on the effects of mineral admixtures, such as silica fume, slag, fly ash, and metakaolin, on the mechanical behavior of young concrete under either uniaxial compression or tension. The uniaxial compression and uniaxial tension tests have been conducted on the concrete specimens at ages of 1/2, 1, 2, 3, 7, and 28 days. By utilizing the circumferential control and adaptive deformation control, the complete stress-strain (deformation) curves have been obtained for young concrete under either uniaxial compression or uniaxial tension. Experimental results show that the different mineral admixtures do have different influences on properties of young concrete. In general, metakaolin shows the best enhancement on the mechanical properties of young concrete.]]></description>
      <pubDate>Thu, 02 Oct 2003 00:00:00 GMT</pubDate>
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      <title>SUPERPLASTICIZED CONCRETE IN HOT WEATHER</title>
      <link>https://trid.trb.org/View/191701</link>
      <description><![CDATA[It is known that hot weather adversely affects some of the properties of both fresh and hardened concrete.  The most affected characteristics of fresh concrete are: increased water requirement, shorter setting time, slump loss, increased plastic shrinkage.  Most of the affected properties of hardened of hardened concrete follow from the increased water requirements of fresh concrete.  Increased rates of temperature rise at early ages complicate the situation further.  In recent years new types of concrete additives, commonly known as superplasticizers, have appeared on the market.  The authors briefly describe the different types of superplasticizer and their modes of operation.  It is shown that some of the adverse effects of hot weather could be counteracted by selecting the right type and proportion of superplasticizer.  The properties which could be influenced are: water requirement, setting time, rate of temperature rise at an early age.  For the covering abstract of the Congress see TRIS 378413.  (TRRL)]]></description>
      <pubDate>Fri, 30 Dec 1983 00:00:00 GMT</pubDate>
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