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1. Specified compressive strength requirements shall be based on?
-compression test cylinders
-laboratory experience
-an approved mix design
-flexural beam samples - Correct Answer: an approved mix design
2. Beams, girders or slabs supported by columns or walls shall not be erected
untill the concrete in the vertical members
-has hardened to 80% of the design f'c
-is stripped of forms
-has sufficient strength to support its weight and loads placed thereon
-is with 10% of the design f'c - Correct Answer: has sufficient strength to
support its weight and the loads placed thereon
3. Without considering tolerances, reinforcing steel placed in concrete cast against
and permanently exposed to earth have a minimum concrete cover of.
-3 inches
,-2 inches
1-1/2 inches
4 inches - Correct Answer: 3 inches
4. The inclined portion of an offset bar shall not have a slope greater then?
-1 in 6
-1 to 1.5
-1 to 12
-10% - Correct Answer: 1 in 6
5. When no special properties are specified or required, _________ portland
cement may be used.
-type I
-type IA
-type II
-type IIIA - Correct Answer: type I
6. Grade 60 deformed reinforcing steel has a minimum yield strength of?
-60,000 psi
-600,000 psi
-6,000 psi
-600 psi - Correct Answer: 60,000 psi
, 7. The tamping rod used in preparing a standard 6 x 12 field test cylinder shall be?
- 1 inch dia.
- 1/2 ich dia
- 3/4 inch dia
- 5/8 inch dia - Correct Answer: 5/8 inch dia
8. The end of the tamping rod shall be?
-rounded to hemispherical tip
-tapered
-flat
-sharpened to a point - Correct Answer: rounded to hemispherical tip
9. The notation for specified compressive strength of concrete is?
- f'm
- f'cr
- f'cs
- f'c - Correct Answer: f'c
10. A concrete mix containing of 150 gallons of water and 30 sacks of portland
cement will produce a water cement ratio of?
-0.4
-0.44
-0.46