Free ACI Field Testing Technician Questions and Answers

The concrete sample that will be used for the slump test needs to be obtained in compliance with ASTM Standard _____.

0.75 in. [19 mm], 1.50 in. [38 mm]

C172, Standard Practice for Sampling Freshly Mixed Concrete

Removed by wet sieving the sample over 1.5 in. [37.5 mm] sieve

2 5/8 in. [70 mm], 6 1/8 in. [160 mm]

Correct! Wrong!

Should vibration be used to solidify the concrete, a typical 4 by 8 in. It is necessary to fill the [100 mm by 200 mm] cylinder mold in _____ equal layers.

C172

Wet sieved over a 1 1/2 in. (37.5 mm) sieve

2

Wet sieved over a 1-in. (25-mm) sieve

Correct! Wrong!

Field-cured cylinders are kept and safeguarded .

False, if the air content is more than 9%, the number of calibrated cups of water introduced into the meter to bring the liquid level within the graduated range must be added

Rod each layer throughout its depth; on the second and final layers, the rod should penetrate into the previous layer approximately 1 in. [25 mm]

Acceptance testing for specified strength, checking the adequacy of mixture proportions for strength, quality control

In or on the structure as near to the point of deposit of the concrete represented as possible; In as near as possible the same way as the formed work

Correct! Wrong!

How far into each layer should the tamping rod be inserted?

Flat, straight steel bar at least 1/8 by 3/4 by 12 in. [3 by 20 by 300 mm] or a 4.4 flat, straight high-density polyethylene bar, or other plastic of equal or greater abrasion resistance, at least 1/4 by 3/4 by 23 in [6 by 30 by 300 mm].

Round, straight steel rod, with a 16 mm [5/8 in.] +- 2 mm [1/16 in.] diameter, length at least 100 mm [4 in.] greater than the depth of the measuring bowl, but not greater than 600 mm [24 in.] in overall length, with the tamping end rounded to a hemispherical tip of the same diameter as the rod.

No more than five seconds at a time, but must be repeated for a minimum of 45 seconds to free concrete from the base

Rod each layer throughout its depth; on the second and final layers, the rod should penetrate into the previous layer approximately 1 in. [25 mm]

Correct! Wrong!

What form does the rod's tamping end need to take?

A pointed tip

A flat plane

Rounded to a hemispherical tip

The frustum of a cone

Correct! Wrong!

Which consolidation technique needs to be applied when the slump is less than one inch? (25 mm)?

Vibration

9000 Vibrations Per Minute [150 Hz]

Rodding

Rapid Evaporation

Correct! Wrong!

Every layer ought to occupy around _____ of the mold's volume.

One-fourth

One-third

One-half

3 Equal

Correct! Wrong!

Use one stroke for every _____ of top surface area when rodding a flexural strength test specimen.

1 in. [25 mm]

1/8 in. [3 mm]

6 in. [150 mm]

2 in.^2 [14 cm^2]

Correct! Wrong!

Before starting any tests on a composite sample, certain portions of the sample must be fully blended. Is it True or False?

TRUE

FALSE

Correct! Wrong!

After the last layer has been firmed up, what should be done if there is an excessive amount of concrete in the measurement?

C172, Standard Practice for Sampling Freshly Mixed Concrete

Add additional concrete to keep an excess of concrete above the top of the mold at all times

Remove a representative quantity of concrete with the scoop or trowel before the strike off

Lightweight, air-cooled blast furnace slag, or aggregates of high porosity

Correct! Wrong!

What is the measuring bowl's minimum permitted volume that this test procedure uses?

28 l (1ft^3)

50 Mm (2 in.)

1/2 In. [12 mm]

6 L (0.20 ft^3)

Correct! Wrong!

FREE ACI Field Testing Technician Questions and Answers

The concrete sample that will be used for the slump test needs to be obtained in compliance with ASTM Standard _____.

Should vibration be used to solidify the concrete, a typical 4 by 8 in. It is necessary to fill the [100 mm by 200 mm] cylinder mold in _____ equal layers.

Field-cured cylinders are kept __________ and safeguarded __________.

How far into each layer should the tamping rod be inserted?

What form does the rod's tamping end need to take?

Which consolidation technique needs to be applied when the slump is less than one inch? (25 mm)?

Every layer ought to occupy around _____ of the mold's volume.

Use one stroke for every _____ of top surface area when rodding a flexural strength test specimen.

Before starting any tests on a composite sample, certain portions of the sample must be fully blended. Is it True or False?

After the last layer has been firmed up, what should be done if there is an excessive amount of concrete in the measurement?

What is the measuring bowl's minimum permitted volume that this test procedure uses?

Related Post

Field-cured cylinders are kept and safeguarded .