Chapter 5

Question 1

the determination of the
relative weight proportions of cement, fine aggregate, coarse
aggregate and water by absolute volume as outlined in the
American Concrete Institute (ACI) Standard 211.1,
“Recommended Practice for Selecting Proportions for Normal
and Heavy Weight Concrete.”

Answer 1

design of concrete mixture

Question 2

The design of concrete mixture is the determination of the
relative weight proportions of cement, fine aggregate, coarse
aggregate and water by absolute volume as outlined in the
________________________
“Recommended Practice for Selecting Proportions for Normal
and Heavy Weight Concrete.”

Answer 2

American Concrete Institute (ACI) Standard 211.1,

Question 3

The design of concrete mixture is the determination of the
relative weight proportions of cement, fine aggregate, coarse
aggregate and water by absolute volume as outlined in the
American Concrete Institute (ACI) Standard 211.1,
___________________________________

Answer 3

“Recommended Practice for Selecting Proportions for Normal
and Heavy Weight Concrete.”

Question 4

The purpose of concrete mixture is designed to give the _________________________

Answer 4

most economical
and most practical combination of the materials

Question 5

The concrete mixture is designed to give the most economical
and most practical combination of the materials which will
produce the desired

Answer 5

workability, strength and durability.

Question 6

Some the materials used in producing concrete should
be tested as to quality ahead of the start of concreting
work,

Answer 6

False, All

Question 7

Cement Factor Specification

Answer 7

9.10 bags/cu.m.

Question 8

Flexural Strength at 14 days

Answer 8

3.8 MPa (550 Psi) Third-Point Loading

4.5 MPa (650 Psi) Mid-Point Loading

Question 9

Compressive Strength

Answer 9

85% of 3500 Psi

Question 10

Slump Specification

Answer 10

40-75mm (1.5”-3”)

Question 11

The mix shall either be designed or approved
by the Engineer.

Answer 11

True

Question 12

A change in the source of materials during the
progress of work must necessitate a new mix design.

Answer 12

False (may)

Question 13

Other
methods of proportioning may be employed in the mix design with prior
approval of the Owner.

Answer 13

False (Engineer)

Question 14

All superstructures and heavily reinforced substructures.

Answer 14

Class A

Question 15

The important parts of the structures included are slabs, beams, girders,
columns, arch ribs, box culverts, reinforced abutments, retaining walls and
reinforced footings and large diameter cast-in-place reinforced concrete
piles (bored piles).

Answer 15

Class A

Question 16

Footings, pedestals, massive pier shafts, pipe bedding, and gravity
walls, unreinforced or with a small amount of reinforcement.

Answer 16

Class B

Question 17

Thin reinforced sections, railings, precast R.C. piles and cribbing and for filler in steel grid floors.

Answer 17

Class c

Question 18

Pre-stressed concrete structures and members.

Answer 18

Class P

Question 19

Concrete deposited in water.

Answer 19

Seal

Question 20

It will be necessary for the Project Engineer to determine in
advance of construction by means of trial mixes, the exact
proportions by weight for each class of concrete. If the trial mix or
batch is made in the laboratory, representative samples of the
concrete materials which will be used in the work should be
furnished.

Answer 20

True

Question 21

The second trial mix is selected on the basis of established relationships
such as those given in Table V.

Answer 21

False

Question 22

This Table, which has been developed
from experience and data from several research agencies, indicates
the __________________ required per cubic meter of concrete and the
________________ (of total aggregate by absolute volume) required for
good workability

Answer 22

amount of water, perfect sand

Question 23

The values in Table V are based on a mix having a water-cement
ratio of ____ by weight of ____ kg. per bag of cement, ____
mm slump and natural sand having a fineness modulus of
_____

Answer 23

0.57, 22.80, 75.0, 2.75

Question 24

Each _____ increase or decrease in water-cement ratio

Answer 24

0.05

Question 25

Each 0.10 increase or decrease in fineness modulus of sand is ____ of percent sand and ____ net water contetn

Answer 25

1/2, 0

Question 26

is defined as the condition of
an aggregate in which the surfaces of the particles are “dry”, but
the inter-particle voids are saturated with water.

Answer 26

Saturated surface dry (SSD)