ASTM Concrete Slump Test Precision
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Questions and Answers

What was the primary purpose of adding a double dosage of chemical retarder to the concrete?

  • To change the type of cement used
  • To increase the slump of the concrete
  • To reduce the amount of cementitious materials
  • To minimize slump losses and maintain workability (correct)
  • What was the ratio of cement to fly ash in the concrete mixture?

  • Equal parts by volume
  • 2:1 by weight
  • 1:2 by weight
  • 1:1 by weight (correct)
  • What was the average slump loss during the 20-minute testing period?

  • 1.5 in.
  • 0.68 in. (correct)
  • 0.5 in.
  • 1.0 in.
  • What was the temperature range of the concrete during testing?

    <p>86 to 93°F</p> Signup and view all the answers

    Why were both metal and plastic molds used in testing?

    <p>To compare the results between the two</p> Signup and view all the answers

    What was the total number of slump tests performed?

    <p>270</p> Signup and view all the answers

    What was the purpose of using a low slump in the initial concrete delivery?

    <p>To create a base for further concrete mixing</p> Signup and view all the answers

    What is the definition of 'same materials' in the context of this test method?

    <p>Freshly mixed concrete from one batch</p> Signup and view all the answers

    Why does this test method have no bias?

    <p>Because slump is defined only in terms of this test method</p> Signup and view all the answers

    What was the type of cement used in the concrete mixture?

    <p>Type I/II</p> Signup and view all the answers

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