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Construction considerations for low density concrete

Quiz Questions:

1.	What does ACI stand for?

		American Concrete Institute
		Applicability civil institute
		American code institute
		None of the above

2.	Densities typically ranging from 140 to 150 lb/ft^3 fall into which category?

		Normal density concrete
		Low density concrete
		High density concrete
		None of the above

3.	Low density structural grade aggregate (LDA) typically has specific gravities in the range of 1.3 to 1.7, although specifications are based on loose bulk density, as covered by ASTM C 330.

		True
		False

4.	Specified density concrete is that in which normal density coarse aggregates have been partially replaced with low-density, structural grade coarse aggregate.

		True
		False

5.	What does ASTM stand for?

		American standard testing machine
		American society for testing machines
		American society for testing and materials
		None of the above

6.	The percentage of water absorbed in coarse aggregate for normal density concrete is higher than low density concrete.

		True
		False

7.	Although low-density fine aggregate can be used, typical practice in North America is to use normal density sand for the fine aggregate fraction.

		True
		False

8.	The water-cementitious materials ratios or minimum compressive strength ratios for normal density concrete are less than 0.40

		True
		False

9.	The normal size of coarse aggregate for a normal density concrete (mm) is

		4.75 - 25.0
		1.25 – 3.5
		9 – 13
		None of the above

10.	Low density concrete can be successfully pumped to 60 – story buildings.

		True
		False