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1. What is the name of the stage of \"being less than potentialabsorption\"?

   	a.	Saturated Surface Dry
   	b.	Air dry
   	c.	Oven dry
   	d.	Damp

1 points   

QUESTION 2

1. Fine aggregates are particles that . . .

   	a.	are all of these items
   	b.	completely pass through a 3/8 inch (9.5 mm) sieve.
   	c.	are created from crushing stone.
   	d.	are made of natural sands.

1 points   

QUESTION 3

1. The amount of Fine Aggregate passing the #50 and the #100 sieveswill affect . . .

   	a.	strength of the concrete
   	b.	workability and bleeding of the concrete
   	c.	the durability of the concrete.
   	d.	color of the concrete

1 points   

QUESTION 4

1. New concrete made from recycled aggregate, as compared toconventional aggregate, has all of the following properties except. . .

   	a.	some reduction in compressive strength using recycled fineaggregates only.
   	b.	dry shrinkage and creep of the concrete up to 100% lower.
   	c.	equal or better freeze-thaw resistance.
   	d.	good durability.

1 points   

QUESTION 5

1. Care in selecting gap-graded aggregates is not affected by . ..

   	a.	the cost of processing the material is much less than inregularly graded aggregate.
   	b.	excess fine particle sizes may have a higher water demand.
   	c.	homogenizing or segregation may be a problem.
   	d.	certain particle sizes are intentionally omitted.

1 points   

QUESTION 6

1. Aggregates used to produce insulating light-weight concrete (15- 90 lb/cubic foot) include . . .

   	a.	sand, gravels, crushed stone, and air-cooled blast furnaceslags.
   	b.	expanded shale, clay, and slates.
   	c.	barite, limonite, magnetite, ilmenite, hematite, iron and steelpunchings or shot.
   	d.	pumice, scoria, vermiculite, and diatomite.

1 points   

QUESTION 7

1. A factor that does not increase acid or corrosive resistance ofa fresh mixed concrete is . . .

   	a.	a low permeability.
   	b.	a low-to-moderate cement content.
   	c.	a low water-cement ratio.
   	d.	a protective coating.

1 points   

QUESTION 8

1. Natural aggregates are . . .

   	a.	dug or dredged from a pit, river, lake or seabed.
   	b.	created by screening and washing large quantities of minedmaterial for needed sizes.
   	c.	created by crushing large rock, boulders or cobbles
   	d.	created by crushing recycled pavements and other concretematerials.

1 points   

QUESTION 9

1. The larger the value of the fineness modulus, the . . .

   	a.	ratio has nothing to do with aggregate size.
   	b.	finer the aggregate size.
   	c.	ratio must be a value less than 2.3 for best concreteresults.
   	d.	coarser the aggregate size.

1 points   

QUESTION 10

1. Aggregates used to produce fresh-mixed normal-weight concrete(140 - 150 lb/cubic foot) include . . .

   	a.	sand, gravels, crushed stone, and air-cooled blast furnaceslags.
   	b.	expanded shale, clay, and slates.
   	c.	barite, limonite, magnetite, ilmenite, hematite, iron and steelpunchings or shot.
   	d.	pumice, scoria, vermiculite, and diatomite.