Test II

Match words in columns A and B (synonym match):

A B

1. to divide a). to cause b). to contribute

c). to view d). to share

2. waste a). refuse b). need

c). taste d). order

3. hazard a). purlin b). danger

c). strut d). truss

4. unit a). angle b). glue

c). block d). joist

5. superior a). higher-level b). harmful

c). eventual d). comprehensive

6. negligible a). agreeable b). special

c). pleasant d). insignificant

7. to compare a). to become b). to match

c). to mix d). to contact

8. permeability a). penetration b). capability

c). possibility d). workability

9. consumption a). resistance b). substance

c). support d). expenditure

10. to approve a). to applaud b). to authorize

c). to suspend d). to attribute

Test III

Select the best possible answer out of the choices from the list to the statements (multiple choice):

1. The use of fly ash as a part replacement of cement in mortar and concrete …

a. demonstrates improved workability.

b. results in lower heat of hydration.

c. reduces alkali-aggregate reactions.

d. has been made all over the world.

2. Fly ash concrete … .

a. is supposed to be known as a low quality cementitious material.

b. brings about a substantial saving in cement consumption.

c. shows low sulphate resistance.

d. has increased alkali-aggregate reactions.

3. Researchers have proved that concrete with approved quality fly ash … .

a. does not induce corrosion of reinforcing steel.

b. does not exhibit greater resistance to attack of aggressive waters.

c. does not expose high resistance to freezing and thawing.

d. does not provide lower leaching of lime.

4. The use of fly ash increases … .

a. cement consumption.

b. overall construction cost.

c. the modulus of elasticity of concrete.

d. the heat of hydration.

5. Pulverized fuel ash (pfa) is a finely divided powder … .

a. which increases water and air permeability of a mortar.

b. used in oil-well cementing compositions.

c. thrown out as a waste material at the thermal power plants.

d. which reduces workability of concrete.

Test IV

Complete the sentences by filling in the correct word that fits a statement (gap fill). Choose the appropriate words from the word bank given below.

A. elasticity B. thawing C. permeability D. hazard

E. cement F. consumption G. leaching H. precast

I. resistance J. plain K. environments L. cellular

1. The fly ash is an industrial waste and great …… for our environment.

2. Lime fly ash …… concrete is one of the important building materials which can be produced from fly ash.

3. The use of fly ash increases the modulus of …… of concrete.

4. Fly ash provides lower …… of lime liberated during hydrating of cement.

5. Adding fly ash to concrete ensures greater …… to attack of aggressive waters.

6. One of the advantages of fly ash concrete over the corresponding plain cement concrete is lower water and air …… .

7. Superior resistance to freezing and …… is another positive feature of fly ash concrete.

8. The cost of fly ash is negligible as compared to that of the …… .

9. The use of fly ash concrete brings about a substantial saving in cement …… .

10. Concrete with approved quality fly ash does not induce corrosion of reinforcing steel even in marine and industrial aggressive …… .

UNIT 16