Deterioration of Steel Reinforced Concrete Due to Corrosion

If moisture is present, then corrosion of steel embedded in the steel reinforced concrete will be an important concern that would require serious attention, since it has extensive financial implications. Damage due to corrosion of rebar may occur in large structures such as residential buildings, bridges, tunnels, due to which these may also become dangerous if appropriate remedial actions are not taken. Therefore, techniques have been developed that can measure the gravity of rebar corrosive effects in the existing structures, and also to foresee their residual life. Measurements are carried out on the rebar or on embedded rebar probes, and useful information concerning the extent of corrosive damage can be obtained.

Read and memorize the active vocabulary to the text:

Active Vocabulary

1. reinforced concrete железобетон

2. to contain содержать, вмещать

3. to embed вставлять, встраивать

4. fiber волокно

5. capability способность, возможность

6. load нагрузка

7. to magnify увеличивать

8. to resist сопротивляться

9. tensile растяжимый

10. span расстояние между опорами, пролет

11. rigid жесткий, твердый

12. to withstand выдерживать

13. bending изгиб; изгибающийся

14. expansion расширение, пространство

15. robust крепкий, сильный

16. to roughen делать шероховатым

17. alkaline щелочной

18. toll booth пункт взимания дорожных сборов на платных дорогах

19. moisture влага

20. implication смысл, подтекст

21. damage повреждение, порча

22. remedial ремонтный, корректирующий

CONTROL TESTS

TEST I

Decide whether these statements are true or false:

1. a). Reinforced materials are embedded in the concrete to resist corrosion and consequently increase the life of the structure.

b). Reinforced materials are embedded in the concrete because such structures are light, have a long life, and are at times more economical.

c). Reinforced materials are embedded in the concrete in such a way that the two materials resist the applied forces together.

2. a). Plain concrete is not suitable for most construction projects because it requires a protective layer to resist corrosion.

b). Plain concrete is not suitable for most construction projects because it cannot easily withstand the stresses.

c). Plain concrete is not suitable for most construction projects because such a material can not be used for making any size and shape.

3. a). The main quality of reinforced concrete is similarity of its coefficient of thermal expansion with that of steel.

b). The main quality of reinforced concrete is enhancement of the structural tensile strength.

c). The main quality of reinforced concrete is enhancement of the structural compression strength.

4. a). On the hardening of the cement paste inside the concrete, it forms a strong bond to resist stresses over a long span.

b). On the hardening of the cement paste inside the concrete, it presents excellent mechanical properties.

c). On the hardening of the cement paste inside the concrete, it corresponds to the surface features of the steel.

5. a). A category of non-steel reinforcement is concrete with fibrous material that enhances the structural compression strength.

b). A category of non-steel reinforcement is concrete with fibrous material that enhances the structural bending strength.

c). A category of non-steel reinforcement is concrete with fibrous material that enhances the structural tensile strength.

TEST II

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

A B

1. reinforced a). implemented b). developed

c). referred d). strengthened

2. extensively a). explicitly b). visually

c). widely d). deeply

3. to apply a). to measure b). to employ

c). to produce d). to depend

4. suitable a). appropriate b). reverse

c). residential d). standard

5. similarity a). property b). delineation

c). precision d). analogy

6. plain a). ordinary b). same

c). further d). average

7. cohesive a). strong b). impressive

c). twisting d). binding

8. to initiate a). to equip b). to resolve

c). to begin d). to correct

9. to require a). to establish b). to demand

c). to refer d). to relocate

10. environment a). understanding b). capacity

c). housing d). surroundings

TEST III

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

1. The compressive strength of concrete and the tensile strength of steel… .

a. cannot easily withstand the stresses created by vibrations, wind, or other forces.

b. are enhanced by the roughening of steel bars.

c. form a strong bond to resist these stresses over a long span.

d. allow the stresses to be efficiently transmitted between the two materials.

2.Concrete consists of a cement and stone aggregate mixture … .

a. that withstands compression, bending, and tensile stresses.

b.that forms a rigid structure with the addition of water.

c. that can resist corrosion and consequently increase the life of the structure.

d. thatdoes not require a protective layer to resist corrosion.

3. A film is formed on the steel … .

a. because of the alkaline environment created by lime.

b. because of the addition of water.

c. because of the roughening of steel bars.

d. because of the addition of polymer fibers.

4. When steel is embedded in concrete, … .

a. this RC is used extensively in all construction.

b. such mixtures are light, have a long life, and are at times more economical.

c.the composite material withstands compression, bending and tensile stresses.

d. that presents excellent mechanical properties.

5.The cohesive characteristics between the steel and concrete are enhanced …

a. with the addition of water.

b.by the roughening of steel bars.

c. due to the alkaline environment created by lime.

d. due to the internal stresses.

TEST IV