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Biz Law > Construction Trade > Flashcards

Construction Trade Flashcards

0
Q

Packed cinders or gravel should be used as a base for slab floors when the soil tends to retain water.

A

True

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1
Q

Concrete can be thinned to any consistency and still retain its full strength

A

False. Water will weaken concrete.

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2
Q

Slightly salty water used in mixing concrete will not harm the mixture.

A

False. Water should be clean and free of salt

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3
Q

Voids in concrete are caused by inadequate tamping, spading, or vibrating when being poured.

A

True

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4
Q

The concrete forms should be dry while mix is being poured.

A

False

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5
Q

The footing trenches should be dry when concrete is poured.

A

False

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6
Q

Clay makes a better footing base than sand or gravel.

A

False

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7
Q

Concrete is fully cured in seven days.

A

False. The longer it has to cure the stronger it will be.

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8
Q

It is permissible to add more water to concrete if it begins to lose its workability after one hour of working with it.

A

False. Concrete begins to set about 30 minutes after it is mixed with water and should not be thinned again.

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9
Q

It is good procedure to use a membrane such as a roofing felt between the concrete slab floor and it’s base.

A

True

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10
Q

The slump test determines the consistency of concrete.

A

True. This test shows how much a given amount of concrete sags when emptied from a container

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11
Q

Beach sand is not advisable to use in some mixtures

A

True. Sand containing any salt should not be used.

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12
Q

A good mixture for a footing consist of one part cement, four parts sand, and three parts rock gravel.

A

False. A good mixture is 1 part cement, 2 1/4 part sand, and 3 parts gravel.

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13
Q

Forms of concrete soffits can be stripped within three days.

A

False. 7 days should be the minimum.

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14
Q

Expansion joints or lines should be provided for the expansion and contraction of the concrete walks

A

True

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15
Q

A broom finish or slightly rough finish is better than a steel trowel finish for a walk.

A

True

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16
Q

Terrazzo is a special mixture of concrete

A

True

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17
Q

Concrete should be mixed dry before water is added.

A

True

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18
Q

Concrete should be cured by sprinkling with water daily for about seven days.

A

True

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19
Q

Monolithic construction in concrete means one piece concrete construction free of construction joints.

A

True

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20
Q

Monolithic topping is the finish topping.

A

True

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21
Q

Excessive spading, tamping, or vibrating of concrete will cause a separation of materials and the course aggregate will settle to the bottom.

A

True

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22
Q

In pouring concrete from an excessive distance the course aggregate have a tendency to sink to the bottom.

A

True

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23
Q

Sand which contains more than 10% loam or clay can be used in the concrete mix.

A

False. Fine aggregates should consist of natural sand or screenings of crushed rock and should be free from injurious amounts of loam, clay, or organic material.

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24
Q

Anchor bolts should be put into the concrete after the concrete has started to set.

A

False. The bolts should be put in as soon as possible in order to have a good grip.

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25
Q

The picot test is a test for abrasiveness of concrete.

A

True

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26
Q

Reinforcing bars should overlap at least 40 diameters at their joints. (40 times the diameter of the bar).

A

True

27
Q

Mixing 1 cubic yard of gravel with 1 cubic yard of sand will yield 2 cubic yards of mix.

A

False. The yield will be less as the sand will fill in the void in the gravel when mixed.

28
Q

Voids are open air spaces or pockets in concrete, they should be eliminated when concrete is poured by adequate tamping, spading, or by vibrating.

A

True

29
Q

A steel trowel finish is recommended for all sidewalks.

A

False. It will make the sidewalk to smooth.

30
Q

It is permitted to dig a foundation trench 4 feet deep within 1 foot of a foundation.

A

False

31
Q

If a trench is dug too deep it is permissible to refill the trench with loose dirt if it is to be used for a foundation.

A

False. The dirt will be too soft for the foundation.

32
Q

Concrete does not reach it’s maximum strength in 1 or 2 weeks after his poured, it may take years to reach it’s maximum strength.

A

True

33
Q

One cubic yard of coarse aggregate plus 1/2 cubic yard of fine aggregate will make 1 cubic yard total.

A

False. It will be a little over 1 cubic yard.

34
Q

Cement mortar is usually composed of 1 part cement and 3 parts of fine sand.

A

True

35
Q

The force that is most commonly applied to concrete is __________.

A

Compression

36
Q

One sack of cement contains the following cubic feet of cement:
A- 5 ft.³ , B- 6 ft.³ , C- 2 ft.³ , D- 1 ft.³

A

D- 1 cubic ft.

37
Q

One sack of cement contains the following pounds of cement:

A-100 lbs., B- 90 lbs., C- 94 lbs., D- 110 lbs.

A

C- 94 lbs.

38
Q

One barrel of cement weighs:

A- 400 lbs., B- 325 lbs., C- 376 lbs.

A

C- 376 lbs.

39
Q

One barrel of cement contains the following sacks of cement:

A- 3 sacks, B- 4 sacks, C- 5 sacks, D- 6 sacks

A

B- 4 sacks

40
Q

One barrel of cement weighs 4 times as much as 1 sack of cement and has 4 times as many cubic feet.

A

True

41
Q

A construction wheelbarrel will hold approximately 4 ft.³ of material when filled.

A

True

42
Q

An “admixture” in concrete is any material other than cement, aggregates, and water that is added to the concrete.

A

False. It increases the setting time.

43
Q

An “accelerator” is some type of material added to the concrete to slow down the set of the concrete.

A

False. It increases the setting time.

44
Q

A “retarder” speeds up the set of the concrete.

A

False. It slows the setting down.

45
Q

Calcium chloride is an accelerator admixture that will fast harden concrete.

A

True

46
Q

__________ ___________ __________ is the retarder used as an admixture to concrete to slow down the set of the concrete.

A

Calcium Lingo Sulfonate or Hydroxylated Carbonic Acid.

47
Q

How many cubic feet of concrete will the following make: 1 cubic foot of cement, 2 ft.³ of sand, and 4 ft.³ of course aggregate:
A- 4 cu. ft, B- 4 1/2 ft.³, C- 6 ft.³, D- 7 ft.³

A

B- 4 1/2 ft.³

48
Q

Concrete is a mixture of 2 substances.

A

False

49
Q

1-2-4, means what in concrete?

A

1 part cement, 2 parts sand, and 4 parts of stone or course aggregate.

50
Q

A 1-2-3 mix in concrete makes 1 cubic foot of concrete.

A

False

51
Q

A “jitterbug” in concrete is used for vibrating, forcing the course aggregates below the surface and brings fine material and fat to the surface for fast easy finishing.

A

True. (We think this is the answer they are looking for. A “jitterbug” is really a wire mesh tamper not a vibrator.)

52
Q

What is fire clay?

A

It is light fluffy clay that must be used for laying fire bricks it is the only mortar that can resist heat and flame.

53
Q

Fresh poured concrete that is vibrated remains fluid and acts as a liquid, filling voids, while being vibrated.

A

True

54
Q

It is a good practice to gently tamp the mudsill down into the mortar while it is still wet to assure a full contact of the mudsill.

A

True

55
Q

The sideview (long side) of bricks is called __________.

A

Stretchers or face.

56
Q

The end view (short side) of bricks is called __________.

A

Headers

57
Q

It is not permissible to use retempered concrete.

A

True. Concrete that has set is considered tempered and should not be re-tempered and used again.

58
Q

What are expansion joints for in concrete?

A

Concrete will expand and shrink according to temperature. An expansion joint will take up the expansion without permitting the concrete to crack. Some expansion joints are formed by wood, fiber board, tar, Celotex, etc. These are all soft materials that will contract when the concrete expands against them.

59
Q

A good concrete mixture should:
A-run off a shovel,
B-stick to a shovel,
C- slide off a shovel

A

C- slide off a shovel.

60
Q

The standard sizes of reinforcing bars are 1/2 inch to 2 inch.

A

False

61
Q

It is better to hot bend reinforcing rods for concrete three-quarter inch and over in size.

A

False. Cold bending is better.

62
Q

According to the Uniform Building Code Standards, reinforcing bars come in sizes from three-eights inch to 2 1/4 inch.

A

True

63
Q

“Portland” cement is a manufactured cement. The name “Portland” is not a brand-name, it refers to a type of cement.

A

True

64
Q

What is “unslaked lime” in mortar and when is it used?

A

Unslaked lime is lime that has not been treated with water. When lime is treated with water it is known as slaked lime. It is used in mortar for brick and stone laying for a better workability of the mortar. It makes the mortar smoother and easier to handle.

Biz Law (5 decks)

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