Summary Test

Question 1

True or false. The method of determining air content of content containing lightweight aggregate is the pressure method

Answer 1

false

Question 2

true or false: when making a test cylinder from concrete being used in construction, the field technician must also measure the slump of the concrete.

Answer 2

True

Question 3

While the technician is checking the slump of the concrete there is a decided falling away or shearing off of concrete from one side of the sample. What should the technician do?

Answer 3

Disregard test, and retest on another portion of the sample

Question 4

Preparation of specimens for transport include

Answer 4

determination that at least 8 hours has elapsed since final set

Question 5

If the aggregate correction factor for a given source of fine and course aggregate is found to be .2% in a pressure air meter, and an air content value of 5% is reason the gage of the same air meter containing concrete with the same aggregate, what is the correct air content?

Answer 5

4.8%

Question 6

strength test specimens transported from the field to the testing lab must be

Answer 6

protected from jarring, protected from moisture loss, protected from freezing

Question 7

Test for slump and air content must be started within ___ after obtaining the final portion of the composite sample

Answer 7

5 min

Question 8

the min size for samples to be used for strength test is ____

Answer 8

1 cf of 28 L

Question 9

For normal strength concrete what temperature range must be maintained for test cylinders during initial curing?

Answer 9

60 to 80 degrees

Question 10

true or false when a concrete contains large aggregate the testing tech should wet screen the sample before making density tests for the use in yield computations.

Answer 10

False

Question 11

When determining the temperature of fresh concrete, what is the min amount of cover in all directions around the sensor of the temperature taking device

Answer 11

3 inches

Question 12

true or false: the sides of the slump mold should be lightly tapped to consolidate the concrete to the mold

Answer 12

false

Question 13

true or false: unless specified otherwise, strength test specimens molded from concrete having a slump less than 1 inch must be consolidated by vibration

Answer 13

true

Question 14

should the tampering rod be flat, tapered, or pointed

Answer 14

none it should have hemispherical end

Question 15

start molding strength test specimens within ____ after fabricating the composite sample

Answer 15

15 minuets