Concrete is a basic construction material that's made up of a paste and aggregates. The paste is made of water and portland cement, which coats the surface of the aggregates. The chemical reaction of hydration hardens the paste and forms concrete.  Concrete should have the following properties: Workability: The concrete mix should be easy to place and consolidate Strength: Concrete should be resistant to wear, freezing, thawing, and water tightness  Here are some other things to consider when working with concrete: Reinforced concrete This is one of the most common materials used in... Show more

Concrete is a basic construction material that's made up of a paste and aggregates. The paste is made of water and portland cement, which coats the surface of the aggregates. The chemical reaction of hydration hardens the paste and forms concrete. 

Concrete should have the following properties:
Workability: The concrete mix should be easy to place and consolidate
Strength: Concrete should be resistant to wear, freezing, thawing, and water tightness 

Here are some other things to consider when working with concrete:
Reinforced concrete
This is one of the most common materials used in construction. Steel rods, wire, or cables are embedded in the concrete to strengthen its structure and help it withstand strong forces like earthquakes.
Lightweight concrete
This concrete has improved insulation, thermal properties, and a reduced mass. It can still maintain strength and durability during construction.
Fiber-reinforced polymers (FRPs)
These are commonly used to strengthen concrete structures because they are lightweight, strong, and durable.
Precast concrete
This is a popular method used in construction. It's easy to use for small retaining walls, highway barriers, and wide commercial spaces.
Prestressed concrete
This type of concrete is tightly compacted during manufacture to reinforce it against tensile pressures that will occur in service. 

Concrete should also be able to withstand heavy loads. Concrete test results depend on the cement strength, water-cement ratio, and concrete quality. 

Cement Concrete Construction topics include: Cement concrete properties, steel corrosion in concrete, proportioning and curing concrete, water cement ratio, concrete types and joints.

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Building & Construction Practice Test: Cement Concrete Construction

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25 Questions

1. The water enters into chemical action with cement and this action causes ________ and ________ of concrete.

Strong, weakSwelling, shrinkageSetting, hardeningExpansion, contraction

2. The process of selection of relative proportions of cement, sand, course aggregate and water, so as to obtain a concrete of desired quantity is known as the ________

Proportioning of waterProportioning of concreteProportioning of reinforcementProportioning of cement

3. The ratio of the amount of water to the amount of cement by weight is termed as the _______

Aggregate-sand ratioSand-aggregate ratioWater-cement ratioCement-water ratio

4. All ________ tend to accelerate the setting of cement and to improve the strength of concrete in early stages.

SulphatesSodiumChloridesPotassium

5. While placing concrete in hot weather, the aggregate should be _____________ to bring down the temperature of concrete.

Pre cooledWashedBurntHeated

6. It is found that the _______ water does not lead to corrosion of reinforcement, provided the concrete is dense and there is enough cover to the reinforcement.

FreshSewageSeaRiver

7. What is minimum cement content for concrete permanently under sea water to avoid the corrosion of reinforcement?

5 N/m33 N/m35 kN/m33 kN/m3

8. It is found that the ________ does not lead to the corrosion of reinforcement, provided that the concrete is dense and there is enough cover to the enforcement.

Sea waterStream WaterGround waterLake water

9. According to the __________ law given by Abram as a result of many experiments, the strength of well compacted concrete with good workability is dependent only on the water cement ratio.

Water-sand ratioWater-cement ratioCement contentWater content

10. The ___________ are open at top and their bottoms are provided with openable doors.

BevelBucketsHopperTremie

11. The term ________ of concrete is used to mean the compaction between aggregate and aggregate; between aggregate and reinforcement and between aggregate and forms.

HardeningCompactionCuringConsolidation

12. The _______ corrosion occurs when two dissimilar metals are in electrical contact with each other and exposed to an electrolyte.

Galvanic corrosionElectrochemical corrosionDry corrosionHigh temperature oxidation

13. __________ method is not in common use in case of placing concrete underwater.

TremieSpreadingGunitingGrouting

14. The _________ is used to measure the workability of concrete mixture which is commonly used in the field.

Compaction factorVee-bee testSlump testWorkability test

15. ________ is the commonly accepted theory of corrosion.

Electrochemical corrosionHigh temperature oxidationDirect corrosionGalvanic action theory

16. The term ________ is define as an act or process of gradual wearing away of a metal due to chemical or electro chemical reaction by its surrounding such that the metal is converted into an oxide, salt or some other compound.

CorrosionDissolutionPrecipitationErosion

17. Identify the given joint in Concrete Structures.

Water tank jointExpansion construction jointVertical construction jointHorizontal construction joint

18. ___________ corrosion takes place at or near the room temperature when the metal comes into contact with moisture or with aqueous solutions of salt, acids or bases.

Galvanic corrosionElectrochemical corrosionDry corrosionDirect corrosion

19. For lean concrete bases and simple foundation for masonry walls ________ grades of concrete may be used.

M5 and M7.5M10 and M20M1.5 and M2.5M40 and M35

20. The use of reinforcement in the no-fines concrete is generally ________

EconomicalNot recommendedCorrosion proofRecommended

21. __________ vibrators are attached to the form work and the external centring of walls, column, etc.

Immersion vibratorsSurface vibratorsInternal vibratorsShutter vibrators

22. The expansion and contraction joints generally consist of some elastic material, known as ________ which should be compressible, rigid, cellular and Resilient.

FillersKeysJoint filler

23. In ________ method, the fineness modulus of sand and aggregate is determined by the standard tests.

Fineness modulus methodArbitrary methodMinimum void methodMaximum void method

24. The ________ is most liable to corrosion.

NickelAluminiumSteelCopper

25. 1:2:4, 1:3:6, etc. Are used in which method of volumetric proposition.

Finesse modulus methodArbitrary methodMinimum void methodWater-cement ratio method