CE8391, Civil Engineering, Construction materials, Lime mortar, classification, anna university

1. CE8391 CONSTRUCTION MATERIALS
UNIT II - LIME – CEMENT – AGGREGATES – MORTAR
Presentation By
Mr.P.Selvakumar.,B.E.,M.E.
Assistant Professor,
Department Of Civil Engineering,
Knowledge Institute Of Technology, Salem.
Topic : Lime - Lime mortar

2. Lime Mortar
• Lime mortar is composed of lime and sand with water and is one
of the oldest known types of mortars.
• Fat lime or hydraulic lime and inert materials like sand, surkhi or
cinder are used for making lime mortar.

3. Classification of Lime Mortar
i. Non-hydraulic lime mortar
ii. Hydraulic lime mortar
iii. Black Mortar

4. Non-hydraulic lime mortars
• These mortars are prepared by mixing fat lime (well slaked before
use) with sand.
• The usual proportions of lime and sand are 1 : 2 or 1 : 3 by volume.
• They have a light colour.
• They do not cause efflorescence.
• They are unsuitable for damp situations, foundations, thick walls.
• Their setting action depends on the presence of CO2.
• They are suitable only for thin joints in brickwork.

5. Hydraulic lime mortars
• These mortars are made from class A and class B limes.
• Mortars prepared from class A lime is next to cement mortar
in strength
• It can be used in all heavy and important engineering works,
in foundations and for external plastering and pointing
works.
Mortar Mix ratio:
• 1 part of fat lime and 2 parts of surkhi or
• 1 part of the lime plus 1 part of surkhi and 1 part of sand

6. Black mortars
• These mortars are so called because of their colour.
• In these mortars, the usual proportions are 1 part lime to
3 parts of ash or cinder(1 : 3).
• They become hard on setting.
• Due to their less pleasing colour, they are used in internal
walls.

7. Preparation of lime mortar
• The lime mortar is prepared by the following methods :
1. By bullock-driven mortar mill or ghani.
2. By power-driven mortar mill.

8. By bullock-driven mortar mill or ghani

9. By bullock-driven mortar mill or ghani
• When mortar is required on a small scale, it is ground in
bullock-driven, circular mill.
• Slaked lime and sand in specified proportions are mixed
with or without the addition of water on a dry platform
• Then mix then fed to the mortar mill.
• Then the bullock is continuously rotate the shaft for
crushing the mortar mix by means of stone wheel.

10. By bullock-driven mortar mill or ghani
• The crushed mortar must be continually turned over by
means of a 'spoons‘.
• Mortar if needed is added during the grinding so as to
maintain the consistency of paste.
• Mixing is continued till the fine crushing of lime mortar
with uniform cementing properties.

11. By power-driven mortar mill.

12. By power-driven mortar mill.
• An automated power driven mill used to make the mortar.
• This mill runs with the help of Electricity.
• Power driven mill consist of Rollers, Fixed steel pan, pulley, Pivot,
Motor, ect.

13. By power-driven mortar mill.
• This method is employed when a steady and a
continuous supply of lime mortar is required.
• It can produce mortar on a large scale.

14. Properties of lime mortars
• Following are the properties of lime mortars
1. They are quite plastic and workable when wet.
2. They have good working qualities, if made from high-
calcium limes.
3. They develop strength very slowly but gain continuous
strength over long periods.

15. Properties of lime mortars
4. They do not 'set' but stiffen as water is lost by absorption
by the units or blocks in contact, and by evaporation.
5. They provide a fairly strong surface when used for
plastering.
6. They provide enough bond between masonry blocks or
bricks when used for masonry joints.

16. Uses of Lime Mortar
(i) Lime mortar is used in masonry works with stones, bricks or
concrete blocks together.
(ii) It is suitable for chimneys as one of their characteristics is
the continued strength development over a long period.
(iii) It is also suitable for masonry and plastering in cheap and
light load bearing wall
(iv) It is also used for internal work with very thin mortar
joints, or external walls in sheltered conditions where the
mortar is protected by a frost-resistant pointing.

17. Thank You
Any queries?