ACI GRADE 1 WRITTEN EXAM LATEST ACTUAL EXAM 200 QUESTIONS AND CORRECT DETAILED ANSWERS WITH RATIONALES (VERIFIED ANSWERS) |ALREADY GRADED A+

ACI GRADE 1 WRITTEN EXAM LATEST 2023-

2024 ACTUAL EXAM 200 QUESTIONS AND

CORRECT DETAILED ANSWERS WITH

RATIONALES (VERIFIED ANSWERS) |ALREADY

GRADED A+

T or F: After the final rodding, the sides of the slump mold should

should be tapped lightly with the tamping rod. - ANSWER- False

T or F: When raising the slump mold, it should not be rotated or twisted.

(C143/C143M - 15a, Slump of Hydraulic-Cement Concrete) -

ANSWER- True

How much time is allowed for lifting the slump mold? (C143/C143M -

15a, Slump of Hydraulic-Cement Concrete) - ANSWER- 5 +/- 2

seconds

The measurement for slump is made from the top of the mold to what

point is the concrete specimen? (C143/C143M - 15a, Slump of

Hydraulic-Cement Concrete) - ANSWER- The displaced original center

of the top surface of the specimen

The slump of the concrete is measured and reported to the nearest...

(C143/C143M - 15a, Slump of Hydraulic-Cement Concrete) -

ANSWER- 1/4 in (5 mm)

How much time is allowed to conduct the slump test from beginning to

completion? (C143/C143M - 15a, Slump of Hydraulic-Cement

Concrete) - ANSWER- 2.5 minutes

The diameter of the tamping rod used in the test method is _____.

(C138/C138M - 17a, Density (unit weight), yields, and air content

(gravimetric) of concrete) - ANSWER- 16 mm (5/8 in) +/- 2 mm (1/16

in)

What is the required shape of the tamping end of the rod? (C138/C138M

- 17a, Density (unit weight), yields, and air content (gravimetric) of

concrete) - ANSWER- Rounded to a hemispherical tip

What is the required minimum frequency of the vibratos used in this

testing method? (C138/C138M - 17a, Density (unit weight), yields, and

air content (gravimetric) of concrete) - ANSWER- 9000 vibrations per

min (150 hz)

The outside diameter or size dimension of the vibrating element must be

at least ___, but not greater than ___. (C138/C138M - 17a, Density (unit

weight), yields, and air content (gravimetric) of concrete) - ANSWER19 mm (0.75 in), 38 mm (1.50 in)

T or F: A plastic container can be used for the measure in this method.

(C138/C138M - 17a, Density (unit weight), yields, and air content

(gravimetric) of concrete) - ANSWER- False, measure must be steel or

other suitable metal

What is the minimum thickness of a metal striker-off plate?

(C138/C138M - 17a, Density (unit weight), yields, and air content

(gravimetric) of concrete) - ANSWER- 6 mm (1/4 in)

What is the minimum thickness for a glass or acrylic strike-off plate?

(C138/C138M - 17a, Density (unit weight), yields, and air content

(gravimetric) of concrete) - ANSWER- 12 mm (1/2 in)

What is the specific red weight of the mallet used on measures that are

14 L (0.5 ft3)? (C138/C138M - 17a, Density (unit weight), yields, and

air content (gravimetric) of concrete) - ANSWER- 600 +/- 200 g (1.25

+/- 0.50 lb)

Measures other than air meter bowls used for this test must conform to

ASTM _____. (C138/C138M - 17a, Density (unit weight), yields, and

air content (gravimetric) of concrete) - ANSWER- C29/C29M

Air meter bowls used for this test must conform to ASTM _____ and be

calibrated for volume according to ASTM _____. (C138/C138M - 17a,

Density (unit weight), yields, and air content (gravimetric) of concrete) -

ANSWER- C231/C231M, C29/C29M

The concrete sample must be obtained in accodance with what ASTM

method? (C138/C138M - 17a, Density (unit weight), yields, and air

content (gravimetric) of concrete) - ANSWER- C172/C172M

What method of consolidation must be used when the slump is greater

than 75 mm (3 in) (C138/C138M - 17a, Density (unit weight), yields,

and air content (gravimetric) of concrete) - ANSWER- Rodding

What method of consolidation must be used when the slump is less than

1 in. (25 mm]? (C138/C138M - 17a, Density (unit weight), yields, and

air content (gravimetric) of concrete) - ANSWER- Vibration

If rodding is the method of consolidation being used, the measure must

be filled in how many layers? (C138/C138M - 17a, Density (unit

weight), yields, and air content (gravimetric) of concrete) - ANSWER- 3

For a measure of 0.5 ft^3 [14 L], what is the required number of strokes

of the tamping rod for consolidation of each layer? (C138/C138M - 17a,

Density (unit weight), yields, and air content (gravimetric) of concrete) -

ANSWER- 25

When rodding the middle and the top layers, the tamping rod should

penetrate into the layer below approximately ___. (C138/C138M - 17a,

Density (unit weight), yields, and air content (gravimetric) of concrete) -

ANSWER- 25 mm (1 in)

If vibration is the method of consolidation, the measure must be filled in

_____ approximately equal layers. (C138/C138M - 17a, Density (unit

weight), yields, and air content (gravimetric) of concrete) - ANSWER- 2