Types of Admixtures

Question 1

Concrete chemical admixtures shall be classified as follows and shall conform to the requirements
of AASHTO ______.

Answer 1

M194

Question 2

ASTM ____ Standard Specifications for Chemical Admixtures for Concrete covers
the material and the test methods for use in chemical admixtures to be added to hydraulic-cement
concrete mixtures in the field.

Answer 2

C494

Question 3

Water-reducing admixtures will decrease mixing water content by 5 to 12%, depending on the
admixture, dosage, and other materials and proportions. _________ water reducing admixtures are
useful when placing concrete by means of a pump or tremie, and can assist with applications
where placing concrete would otherwise be difficult. They also may improve the properties of
concrete containing aggregates that are harsh, poorly graded, or both.

Answer 3

Type A

Question 4

Admixtures that delay the time of setting of concrete

Retarding Admixtures

Answer 4

Type B

Question 5

Accelerating Admixtures
An admixture that accelerates the time of setting and early strength development of concrete.

Answer 5

Type C

Question 6

Water-Reducing and Retarding Admixtures
An admixture that decreases the quantity of mixing water required to produce concrete of a given
consistency and delays the time of setting of concrete.

Answer 6

Type D

Question 7

Water-Reducing and Accelerating Admixtures
An admixture that decreases the quantity of mixing water required to produce concrete of a given
consistency and hastens the time of setting and early strength development of concrete.

Answer 7

Type E

Question 8

Water-reducing High Range, Admixture
An admixture that decreases the quantity of mixing water required to produce concrete of a given
consistency by 12 percent or greater

Answer 8

Type F

Question 9

Water-Reducing, High Range, and Retarding Admixtures
An admixture that decreases the quantity of mixing water required to produce concrete of a given
consistency of 12 percent or greater and delays the time of setting of concrete.

Answer 9

Type G

Question 10

Specific performance admixtures (e.g. slump retaining admixtures, used to improve and
extend workability time of freshly mixed concrete without negative effect on setting times)

Answer 10

Type S

Question 11

admixtures in which pozzolanic activity can be expected

Answer 11

Fly ash, Silica fume, volcanic ash, Siliceous white clay, Diatomite

Question 12

admixtures which latent hydraulic can be expected.
It Improves durability of concrete

Answer 12

ground granulated blast-furnace slag

Question 13

are admixtures that contribute to gaining high strength during autoclave curing.

Answer 13

Siliceous fine powder

Question 14

decreases material segregation and/or bleeding of concrete
with high Flowability

Answer 14

limestone powder admixtures