ACI Grade 1 Written Exam ACI

ACI Grade 1 Written Exam ACI Grade 1 Actual Exam Latest Update Questions and Correct Answers Rated A+

The temp. measuring device shall be capable of accurately measuring the temp. of freshly mixed concrete to ____ throughout a range of ____. -ANSWER-1 Degree F, 30-120 Degrees F

A composite sample of concrete is required even if the only purpose for obtaining the sample is to determine the temp. T or F? -ANSWER- False

C172/C172M covers sampling from five type of equipment which are___, ___, ___, ___, & ____? -ANSWER-revolving drum, stationary, paving, continuous, & open top

The mold for making the slump test is in the shape of ____. - ANSWER-the frustum of a cone

The surface on which the slump mold will be placed must be ____. - ANSWER-Flat, moist non-absorbent, & rigid

How deep should the tamping rod penetrate each layer? -ANSWER- Rod each layer throughout its depth, on second & final layer the rod should penetrate into the previous layer approximately 1 in.

Prior to lifting the mold, concrete must be removed from ____. - ANSWER-the area surrounding the base of the mold

What is the minimum frequency of the vibrator used in Test Method C138/C138M -ANSWER-9000 Vibrations/Min., 150 Hertz

What is the minimum thickness of a metal strike-off plate used in Test Method C138/C138M? -ANSWER-1/4 in.

What is the minimum thickness of a glass/acrylic strike-off plate used in Test Method C138/C138M? -ANSWER-1/2 in.

Measures other than air meter bowls used for Test Method C138/C138M must conform to Test Method ___. -ANSWER-

C29/C29M

Air meter bowls used for Test Method C138/C138M must conform to Test Method ___ and be calibrated for volume according to Test Method ___. -ANSWER-C231, C29

The pressure method of determining air content can be used on concrete containing ___ ____ aggregate. -ANSWER-relatively dense

The pressure method of determining air content cannot be used on

concrete containing the following types of aggregate: ___, ___, & ___.

-ANSWER-light weight, air-cooled blast furnace slag, & aggregate of high porosity

What is the minimum allowable capacity of the measuring bowl used in Test Method C231/C231M? -ANSWER-6L (0.2ft^3)

What are the required characteristics of the tamping rod used in Test Method C231/C231M? -ANSWER-Round, straight steel rod, w/ a 16 mm (5/8 in) +-2 mm (1/16 in) diameter, length of 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 w/ the tamping end rounded to a hemispherical tip of the same diameter as the rod

What is the specified size of the mallet required for Test Method C231/C231M when the measuring bowl has a capacity of 14 L (0.5 ft^3) or less? -ANSWER-1 & 1/4 lbs +-0.5 lbs

The maximum size aggregate allowed for Test Method C231/C231M is ___. -ANSWER-2 in

What tools maybe used to strike off the top surface of the concrete following consolidation of the final layer? -ANSWER-strike-off plate made of acrylic, glass, or metal

What are the requirements of the strike off bar used in Test Method C173/C173M? -ANSWER-Flat straight steel bar at least 3 x 20 x 300 mm (1/8 x 3/4 x 12 in) or a flat straight high density polyethyline bar, or plastic of equal or greater abrasion resistance at least 6 x 20 x 300 mm (1/4 x 3/4 x 12 in)

In Test Method C173/C173M, When filling the measuring bowl of the air meter, the concrete must be placed in _____ layers of equal volume. -ANSWER-2

The direct reading of the final liquid level, in the neck of the air meter is estimated to the nearest ____. -ANSWER-0.25%

Practice C31/C31M gives standardized requirements for ____, ____, ____, & ____ of test specimens. -ANSWER-Making, curing, protecting, & transporting

For cylinders with a diameter of 150 mm (6 in) or greater, the tamping rod must be a round, straight steel rod with a diameter of ___. - ANSWER-5/8 +-1/16 in

The container for obtaining the concrete sample used in Practice C31 can be a ___, ___, or ___. -ANSWER-metal pan, wheelbarrow, or flat clean non absorbent mixing board.

A 150 x 300 mm (6 x 12 in.) cylinder mold can be used for concrete containing aggregate with particles not exceeding ___ in size, without the need for wet sieving the concrete. -ANSWER-2 in.

The supporting surface on which specimens are stored shall be level within ___. -ANSWER-20 mm/m (1/4 in/ft)

When using an internal vibrator to consolidate a 150 x 300 mm (6 x 12 in) compressive strength test specimen, the vibrator must be inserted at ___ different points for each layer. -ANSWER-2

When consolidating a flexural strength test specimen, by rodding, rod one stroke for each ___ of top surface area. -ANSWER-14 cm^2 (2 in^2)

Concrete mixtures with specified strength of 40 MPa (6000 psi) or greater shall have an initial curing temp. between ___. -ANSWER-- Degrees C (68-78 Degrees F)

Up to 48 hours after molding, test specimens that are to be standard cured shall be stored in a temp. range between ___. -ANSWER-16-27 Degrees C (60-80 Degrees F)