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AASHTO Standard C 191: Time of Setting of Hydraulic Cement

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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?

30 min greater than the maximum and 30 min less than the minimum Signup and view all the answers

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

Compliance with the qualification requirements Signup and view all the answers

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

In Annex A2 Signup and view all the answers

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

To establish acceptance or rejection criteria for cement Signup and view all the answers

Why is standardization necessary in the Vicat test method?

To correct bias in end points Signup and view all the answers

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

When time of setting results are used for acceptance or rejection of cement Signup and view all the answers

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

To ensure the method is applicable to a range of cements Signup and view all the answers