Mortar

What is mortar?

Mortar is defined as the homogeneous mixture of a varying proportion of building materials like cement & sand and sometimes the addition of admixture is required. Mortar is usually named according to binding material used in their preparation. Eg: Cement mortar, lime mortar, etc.

mortar

Types:

Mortar are classified in several ways i.e based on the binding agent, the proportion of binding agent and aggregate(fine aggregate).

 In generally, mortar is classified as :

i) Cement mortar

ii) Lime mortar

iii) Lime mortar 

iv) Mud mortar

v) Cement-clay mortar 

vi) Light and heavy mortar.

vii) Decorative mortar

viii) Fire-resistance mortar

ix) Sound-absorbing mortar

x) Gypsum mortar 

DIFFERENT GRADES OF CEMENT MORTAR

Grade NameMortar Mix (by Loose Volume)Compressive Strength at 28 days (in N/mm2)
CementSand
MM 0.7180.7   to 1.5
MM 1.5171.5 to 2.0
MM 3163.0 to 5.0
MM 5155.0 to 7.5
MM 7.5147.5 to above

Properties:

– It should be easily workable.

– It should develop adequate strength in tension, compression, and bond for the work.

– It should be durable and not affect the durability of other materials.

– It should set quickly so that the speed of construction is ensured.

– It should be cheap or cheaply available.

– It should bind the bricks or stones to give a tight joint through which water cannot penetrate.

– It should be capable of developing stress.

– The joints form by mortar should not develop cracks and they should be able to maintain their appearance for quite a long time.

 Uses:

 It is used to bind together the brick or stone masonry.

– It is used to fill up a gap between the brick and stone for making wall weather tight.

– It is used to give soft even bed between the different layer of brick and stone masonry for equal distribution of pressure over the bridge.

– It is used in pointing and plastering to protect joints and surface of bricks and stone masonry.

– It is used to fill up the joints of pipes.

– It is used to generate the appearance of the structure.

-It is used to hide the open joints of brickwork or stonework.  

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