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Concrete Mix Design Quiz

Total questions: 40

Worksheet time: 20mins

Name
Class
Date
1.

Mix proportioning is the process of:

a)

Testing concrete strength

b)

Determining the correct combination of concrete ingredients

c)

Measuring slump

d)

Selecting aggregate color

2.

The main goal of mix design is to produce concrete that is:

a)

Cheap and colorful

b)

Strong workable durable and economical

c)

Lightweight only

d)

High in sand

3.

Which of the following is NOT a parameter of mix design?

a)

Workability

b)

Strength and durability

c)

Economy

d)

Color

4.

Required concrete strength must be:

a)

Less than design strength

b)

Equal to average strength

c)

Greater than specified design strength

d)

Independent of testing

5.

ACI recommends mix proportions be based on:

a)

Guesswork

b)

Visual inspection

c)

Field experience or lab trial batches

d)

Personal preference

6.

The costliest ingredient in concrete is:

a)

Water

b)

Sand

c)

Cement

d)

Gravel

7.

Using local aggregates helps to:

a)

Increase cost

b)

Reduce cost

c)

Reduce strength

d)

Increase air

8.

Durability depends on:

a)

Cement content

b)

Curing time

c)

Quantity of water

d)

All of the above

9.

Concrete consistency measures:

a)

Color

b)

Temperature

c)

Wetness or fluidity

d)

Strength

10.

Consistency is measured using:

a)

Compression test

b)

Slump test

c)

Sieve test

d)

Absorption test

11.

The slump test indicates:

a)

Air content

b)

Workability

c)

Cement quality

d)

Aggregate size

12.

The slump test was developed in:

a)

1850

b)

1913

c)

1955

d)

2000

13.

To maximize strength, water should be:

a)

Increased

b)

Minimized

c)

Ignored

d)

Doubled

14.

Reducing segregation helps improve:

a)

Color

b)

Durability

c)

Cost only

d)

Slump

15.

Information required for mix design includes:

a)

Sieve analysis

b)

Specific gravity

c)

Moisture content

d)

All of the above

16.

Vcon represents:

a)

Volume of cement

b)

Volume of air

c)

Volume of fresh concrete

d)

Volume of sand

17.

Va stands for:

a)

Air volume

b)

Aggregate volume

c)

Cement volume

d)

Water volume

18.

Vw stands for:

a)

Water volume

b)

Workability

c)

Weight volume

d)

Wet aggregate

19.

Vc stands for:

a)

Volume of cement

b)

Concrete weight

c)

Coarse aggregate

d)

Air

20.

Vfa stands for:

a)

Fine aggregate volume

b)

Final aggregate volume

c)

Fluid amount

d)

Field aggregate

21.

Vca stands for:

a)

Coarse aggregate volume

b)

Cement amount

c)

Concrete air

d)

Water correction

22.

Step 1 in ACI mix design is:

a)

Select slump

b)

Select cement content

c)

Adjust moisture

d)

Select W/C ratio

23.

Step 2 in ACI mix design is:

a)

Fine aggregate content

b)

Maximum aggregate size selection

c)

Slump test

d)

Cement test

24.

Step 3 in ACI mix design is:

a)

Select W/C ratio

b)

Mixing water and air content selection

c)

Cement content

d)

Moisture correction

25.

Step 4 in ACI mix design is:

a)

Water-cement ratio selection

b)

Slump choice

c)

Coarse aggregate content

d)

Cost analysis

26.

Step 5 in ACI mix design is:

a)

Fine aggregate content

b)

Cement content

c)

Air correction

d)

Slump test

27.

Step 6 in ACI mix design is:

a)

Coarse aggregate content

b)

Moisture correction

c)

Water content

d)

Specific gravity

28.

Step 7 in ACI mix design is:

a)

Fine aggregate content

b)

Cement content

c)

Air adjustment

d)

Slump selection

29.

Step 8 in ACI mix design is:

a)

Adjustments for aggregate moisture

b)

Air content selection

c)

Cement content

d)

Strength test

30.

Nominal maximum aggregate size is:

a)

Smallest particle

b)

Largest sieve retaining some particles

c)

Average size

d)

Stone weight

31.

ACI limit for aggregate size is:

a)

Full slab depth

b)

1/3 slab depth

c)

Half slab depth

d)

Equal to slab thickness

32.

ACI limit for spacing between bars is:

a)

1/4 spacing

b)

3/4 minimum clear spacing

c)

Equal spacing

d)

Full spacing

33.

If aggregate is too large it may cause:

a)

Better compaction

b)

Honeycombing

c)

More strength

d)

Better workability

34.

W/C ratio formula is:

a)

Water volume/Cement volume

b)

Weight of water/Weight of cement

c)

Cement/Sand

d)

Sand/Gravel

35.

If aggregates are dry they will:

a)

Add water

b)

Absorb water

c)

Increase slump

d)

Reduce cement

36.

If aggregates are wet they will:

a)

Absorb water

b)

Reduce water in mix

c)

Add water to mix

d)

Reduce air

37.

Specific gravity is ratio of density to:

a)

Air

b)

Oil

c)

Water

d)

Cement

38.

Moisture correction is needed because it affects:

a)

Color only

b)

Available mixing water

c)

Equipment only

d)

Slump cone size

39.

Reducing cement content generally:

a)

Increases cost

b)

Reduces cost

c)

Increases slump

d)

Reduces durability

40.

Using largest possible gravel reduces:

a)

Strength

b)

Cost

c)

Paste requirement

d)

Workability