AASHTO Standard C 191: Time of Setting of Hydraulic Cement
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Questions and Answers

Why may end points established by a qualified automatic Vicat test method deviate from end points specified in Method A?

  • Because of apparatus malfunction
  • Because of bias requiring standardization (correct)
  • Due to differences in cement quality
  • Due to laboratory errors

What is the purpose of standardization in the Vicat test method?

  • To correct bias in end points (correct)
  • To establish new end points
  • To adjust the apparatus
  • To determine cement quality

How is the range of applicability of the method determined?

  • From the range of the average time of setting of the cements (correct)
  • By the range of cement quality
  • By the apparatus manufacturer's guidelines
  • By the laboratory technician's experience

What is the limit of the range of applicability?

<p>30 min greater than the maximum and 30 min less than the minimum (A)</p> Signup and view all the answers

What is required for the automatic Vicat apparatus when used for acceptance or rejection of cement?

<p>Compliance with the qualification requirements (D)</p> Signup and view all the answers

Where can the qualification requirements for the automatic Vicat instrument be found?

<p>In Annex A2 (A)</p> Signup and view all the answers

What is the purpose of the performance requirement for the automatic Vicat instrument?

<p>To establish acceptance or rejection criteria for cement (D)</p> Signup and view all the answers

Why is standardization necessary in the Vicat test method?

<p>To correct bias in end points (D)</p> Signup and view all the answers

What is the scope of the performance requirement for the automatic Vicat instrument?

<p>When time of setting results are used for acceptance or rejection of cement (C)</p> Signup and view all the answers

What is the purpose of determining the range of applicability of the method?

<p>To ensure the method is applicable to a range of cements (D)</p> Signup and view all the answers

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