Test II

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

A B

1. demolition a). dimension b). equipment

c). failure d). dismantling

2. to recycle a). to receive b). to reclaim

c). to embrace d). to include

3. to gain a). to obtain b). to associate

c). to combine d). to bind

4. yield a). access b). advantage

c). supplement d). output

5. acceptable a). imaginary b). transparent

c). admissible d). evident

6. to incur a). to undergo b). to exist

c). to locate d). to settle

7. conventional a). suitable b). convenient

c). dramatic d). traditional

8. workability a). modulus b). arrangement

c). applicability d). competency

9. approximately a). undoubtedly b). nearly

c). plainly d). immediately

10. contamination a). destruction b). demolition

c). devastation d). pollution

Test III

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

1. Construction and demolition waste … .

a. contain harmful contaminants that cannot be eliminated completely.

b. optimize life-cycle economic performance.

c. is one of the main sources of waste that occupies huge space in landfills.

d. conserve and restore natural resources.

2. With the frequent demolition of roadways and buildings that have completed their useful life, … .

a. it is possible to design and construct buildings using methods and materials that are resource efficient.

b. large aggregates are available for recycling.

c. the strain on local infrastructure is being minimized.

d. the potential of enhancement and protection of biodiversity and ecosystems raises significantly.

3. Grade limits are significant since … .

a. they determine the aggregate quantity to be used, durability and workability of the concrete.

b. they affect considerably the mechanical properties of the manufactured

concrete.

c. wrong particle size may result in internal fractures and premature deterioration of concrete.

d. they determine distribution of the aggregate in concrete.

4. Contamination of the crushed aggregate by detrimental substances from buildings or other harmful materials … .

a. should be carefully assessed.

b. varies with the source of debris.

c. promote expansion of markets of green products.

d. should be avoided since they affect the quality of concrete.

5. Concrete taken from highways or pavements for recycling … .

a. improves the mechanical properties of the manufactured concrete.

b. is not contaminated.

c. normally produces a good quality aggregate.

d. may contain a few contaminants like plaster, gypsum and vinyl.

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. rust B. reclaimed C. impurities D. natural

E. grading F. contaminants G. demolition H. moist

I. drinkable J. limestone K. crushed L. identical

1. With the limited supply of …… materials, concrete recycling has gained much importance.

2. Studies have revealed that concrete is the most commonly used product after …… water.

3. The chloride ions in recycled crushed aggregate may react with reinforced steel to form …… .

4. The quality of recycled concrete is …… , or superior in a few specifications, compared to virgin aggregates.

5. Recycled crushed aggregate normally produces a good quality aggregate that varies with the source of debris and the…… .

6. Since the harmful …… cannot be eliminated completely, acceptable levels should be determined to achieve a quality product.

7. The properties of …… concrete may differ from each other since the sources may be extensive.

8. …… refers to the particle size distribution of the aggregate.

9. Since……is not used, carbon dioxide is not released during the recycling of concrete

10. Sulphation of the recycled crushed aggregates may occur due to the reaction of plaster and gypsum in a …… environment.

UNIT 24