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CMT > Lesson 3 > Flashcards

Lesson 3 Flashcards

(47 cards)

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1
Q

Structures are made up of materials and these materials are known as:

A

building materials or construction materials

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2
Q

True or False. It is vital to know and understand the properties and classifications of materials used in construction as a basis for design specifications.

A

True

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3
Q

The quality, functions or uses, and strength are based on the _____________-.

A

material’s properties

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4
Q

The properties of materials basically fall under two group namely:

A
  1. Physical Properties
  2. Mechanical Properties
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5
Q

Enumerate the properties that falls under physical properties.

A
  1. Specific Gravity
  2. Density
  3. Bulk Density
  4. Porosity
  5. Water Absorption
  6. Hygroscopicity
  7. Permeability
  8. Fire Resistance
  9. Thermal Properties
  10. Corrosion
  11. Durability
  12. Soundness
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6
Q

It is the ratio of the weight of material per unit volume (not including air holes and pores).

A

Specific Gravity

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7
Q

This property is used to calculate the density and porosity of materials.

A

Specific Gravity

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8
Q

It is defined as the mass of a material per unit of its volume.

A

Density

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9
Q

It is defined as the total weight including solids and voids of any granular materials per unit of its total volume

A

Bulk Density or Unit Weight

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10
Q

It is the ratio of the volume of voids in a material to the total volume of granular material.

A

Porosity

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11
Q

It is the property of a material by virtue which is absorbs water from the ambience.

A

Water Absorption

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12
Q

This property is important in the case of stones, bricks, etc.

A

Water Absorption

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13
Q

It is the property whereby a material absorbs water present in the ambience, as in the case of salt, sugar, etc.

A

Hygroscopicity

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14
Q

Which material is hygroscopic?

a. Timber
b. brick
c. iron bars
d. walls

A

timber

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15
Q

It is the property whereby a material allows water to pass through its pores.

A

Permeability

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16
Q

It is important in the case of soils.

A

Permeability

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17
Q

It means readily catch fire.

A

Inflammable

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18
Q

It means it can be burnt but may bot be rapidly ignite.

A

Combustible

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19
Q

How does fire causes damage to fire resistant materials?

20
Q

These are important in the heating or cooling rooms and in designing suitable thermal insulation.

Study These Flashcards
A

Thermal Properties

21
Q

Thermal properties are important in the heating or cooling rooms and in designing suitable thermal insulation. The following are important:

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A
  1. heat capacity
  2. thermal resistivity
  3. sound transmission property
22
Q

It is the gradual destruction of a metal or alloy due to chemical processes such as oxidation.

23
Q

It is the resistance of a material to destruction by natural agencies.

24
Q

It is the resistance of a material to its deterioration due to heat, alternate freezing and thawing, etc.

25
It is important in the case of cement, aggregate, etc.
Soundness
26
These refer to properties whereby materials resist various straining actions or forces.
Mechanical or Strength Properties
27
Enumerate the properties that fall under Mechanical or Strength Properties.
1. Elasticity 2. Plasticity 3. Toughness 4. Resilience 5. Hardness 6. Brittleness 7. Ductility 8. Fatigue 9. Creep 10. Abrasive Resistance 11. Impact Strength 12. Strength Properties
28
It is the property of a material whereby it tends to regain its shape after the removal of an applied load.
Elasticity
29
It is the stress at the limiting point.
Elastic Limit
30
It is the property of a material whereby it retains a change in shape or size after the removal of the load.
Plasticity
31
It is important when a material has to be molded into different shapes.
Plasticity
32
It is the property of a material whereby it absorbs energy due to straining actions by undergoing plastic deformation.
Toughness
33
It is the ability of a material to recover its size and form after deformation.
Resilience
34
It is the resistance offered by any material to indentation, scratching, cutting, or wear by abrasion.
Hardness
35
It refers to the tendency of a material to shatter on receiving a shock.
Brittleness
36
It is the capacity to undergo large plastic deformation before actual failure.
Ductility
37
This property allows the drawing of thin wire of a metal.
Ductility
38
It is the failure of a material by cracking resulting from repeated straining action.
Fatigue
39
It is the property whereby a material undergoes deformation with respect to time under a constant load.
Creep
40
This is over and above the instantaneous elastic strain.
Creep
41
It is the ability of a material to resist wearing due to contact with another surface moving with respect to it.
Abrasive Resistance
42
This is important in road surfaces, warehouse floors, etc.
Abrasive Resistance
43
It refers to the ability of a material to withstand shock.
Impact Strength
44
Enumerate the basic strength properties
1. Tensile Strength 2. Compressive Strength 3. Shear Strength
45
It is the maximum stress a material can withstand under a tensile (stretching) load before failure.
Tensile Strength
46
It is the maximum stress a material can withstand without failure under a compressive load.
Compressive Strength
47
It is the maximum stress at failure under a shearing load (a load parallel to the cross-section of the member).
Shear Strength

CMT (6 decks)

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