ASTM C172

Sampling with this method is required when tests are to be made to determine ___ with specification requirements.

This method covers sampling from four types of mixers, which are ___, ___, ___, and ___.

The maximum allowable time between obtaining the first and final portions of a composite sample is ___ minutes.

Portions of a composite sample shall be thoroughly remixed before beginning tests on the sample.  True or False?
True False

The maximum elapsed time allowed between obtaining the final portion of the composite sample and beginning the tests for slump, temperature, and air content is ___ minutes.

The molding of strength test specimens shall begin within ___ minutes after fabricating the composite sample.

The concrete sample must be protected from contamination and ___.

The minimum size sample for making strength  test specimens is ___.

When sampling from a stationary mixer, the batch must be sampled at ___ or more regularly spaced intervals during discharge of the middle portion of the batch.

The composite sample for a paving mixer must represent a minimum of ___ different portions of the batch of concrete taken from the pile at discharge.

When sampling from a revolving drum truck mixer, concrete must be sampled at a minimum of ___ regularly spaced intervals during discharge of the middle portion of the batch.

Concrete samples from a truck mixer must be obtained before any water or admixtures are added to the mixer at the job site.  True or False?
True False

The composite sample from a truck mixer must be obtained from the ___ portion of the batch.

When the concrete contains aggregate larger than that permitted for a particular test method, the sample of concrete must be ___ ___ before making the test.