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Testing practice questions

33 questions from the concrete and masonry practice test.

Testing practice test

10 questions, graded as you go, with the reason for every answer. No sign-up.

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Sample questions

What are the dimensions of a standard slump cone?

  1. 6 in. top, 6 in. base, 12 in. high
  2. 4 in. top, 8 in. base, 12 in. high
  3. 4 in. top, 8 in. base, 8 in. high
  4. 6 in. top, 12 in. base, 12 in. high
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B. 4 in. top, 8 in. base, 12 in. high

The mold is a cone frustum 4 in. across the top, 8 in. across the base and 12 in. high. A 6 in. by 12 in. shape is the standard strength cylinder, not the slump cone.

Reference: ASTM C143, apparatus

How is the slump cone filled?

  1. Two layers of equal height, each rodded 25 times
  2. Three layers of equal height, each rodded 15 times
  3. One full layer that is rodded a total of 50 times
  4. Three layers of equal volume, each rodded 25 times
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D. Three layers of equal volume, each rodded 25 times

The cone is filled in three layers of about equal volume and each is rodded 25 times. Because the cone tapers, equal volume is not equal height: the first layer is only about 2-5/8 in. deep.

Reference: ASTM C143, procedure

What tamping rod is used for the slump test?

  1. 3/8 in. diameter with a rounded tip
  2. 5/8 in. diameter with a flat sawn end
  3. 1/2 in. rebar with a deformed surface
  4. 5/8 in. diameter with a rounded tip
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D. 5/8 in. diameter with a rounded tip

The standard rod is a smooth, straight 5/8 in. steel rod with a hemispherical tip. The 3/8 in. rod is used for 4 in. cylinders, and rebar or a flat-ended rod is never acceptable.

Reference: ASTM C143, apparatus

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