CE Materials Lab 4

What will we be conducting in lab this week?

• Mix concrete based on our designs

• Water to cement ratio test

• Air Content test

• Slump test

What are the first 2 materials we add to the mixer?

• Water

• Cement

• Fine Aggregate

• Course Aggregate

During the slump test and air content test, each device must be ____ before starting the test.

• Damp

• Oven Dry

• Covered in a layer of silt

• Saturated

What are the specified mixing times in ASTM 192?

• Mix 10 minutes

• Mix 5 minutes, Rest 5 minutes, Mix 3 minute

• Mix 3 minutes, Rest 3 minutes, Mix 2 minutes

• A specified mixing time is not required.

In ASTM 143, which section describes how the rodding procedure shall be conducted?

• 5.2

• 7.1

• 7.2

• 8.1

The value of slump is measured as:

• The distance from the ground to the top of the concrete

• The height of the concrete measured against the tamping rod

• The distance between the top of the mold and the concrete that started at the top edge of the mold

• The distance between the top of the mold and the displaced original center of the top center of concrete

From ASTM 231, the air content test is charged using the rodding method. Which section in the ASTM describes this process?

• 5.1

• 6.1.4

• 8.1.2

• 4.9

From ASTM 231, prior to sealing the air content measure you must first make sure which 2 actions are taken?

• Strike off the top surface

• Add a layer of water

• Record the weight of the measure

• Clean the rim of the measure

How many concrete cylinders will you pour today?

• 2

• 3

• 4

• 6

When are you able to remove the concrete from the molds?