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Construction Materials > Lime > Flashcards

Lime Flashcards

1
Q

What is Lime?

A

Cementitious material (binding material)

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2
Q

Chemical formula of Lime

A

CaO

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3
Q

Chemical formula of limestone

A

CaCO3

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4
Q

How is lime obtained from limestone

A

by heating limestone, the process is called calcination

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5
Q

Classification of binding materials

A
  • Air binding
  • Hydraulic Binding
  • Autoclave Binding
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6
Q

Conditions in Autoclave binding?

A

8-12 atm

170 C to 200 C

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7
Q

Sources of Lime

A
  • Limestone (riverbeds, boulders in hills)
  • Seashells (Small quantities)
  • Kankar (impure lime available below ground)
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8
Q

Constituents of Lime

A
  • Clay (8-30%)
  • Soluble Silica
  • Magnesium Carbonate (<30%)
  • Alkalies and Metallic Oxides (<5%)
  • Sulphate
  • Iron
  • Pyrites (impurities)
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9
Q

Classifications of Lime

A
  • Fat lime
  • Hydraulic Lime
  • Poor Lime
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10
Q

Characteristics of Fat Lime

A
  • low impurities (<5%)
  • slow hardening and setting
  • Slaking is vigorous
  • sp. gravity is about 3.4
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11
Q

Fat lime is also known as

A

pure lime, white lime, rich lime, high calcium lime

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12
Q

Uses of Fat lime

A
  • mortar
  • plastering
  • white washing
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13
Q

What is Hydraulic Lime

A
  • Lime that sets in Water
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14
Q

Types of Hydraulic Lime

A
  • Feebly hydraulic lime
  • Moderately hydraulic lime
  • Eminently hydraulic lime
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15
Q

Characteristics of Feebly hydraulic lime

A
  • Clay content : 5-10%
  • Slake time : few mins
  • Setting time : 3 weeks
  • Strength : low
  • Uses : Plaster, whitewash (damp places for less imp. structures)
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16
Q

Characteristics of Moderately hydraulic lime

A
  • Clay Content : 11 - 20%
  • Slake time : 1 - 2 hrs
  • Setting time : 1 week
  • Strength : Moderate
  • Uses : Superior strutures
17
Q

Characteristics of Eminently hydraulic lime

A
  • Clay content : 21 - 30%
  • Slake time : Difficult to slake
  • Setting time : 1 day
  • Strength : high
  • Uses : structures that carry more load
18
Q

Characteristics of Poor Lime

A
  • Hardens very slowly
  • Slakes very slowly
  • Color varies from yellow to gray
  • Thin paste with water
19
Q

Classification of lime according to IS (Indian Standards)

A
  • Class A to Class F with Class A being the most superior
20
Q

IS classification statement

A

IS: 712, 1984

Construction Materials (6 decks)

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