Strength Of Brick Masonry

The strength of brick masonry mainly depends on the strength of bricks that are used in the construction. The strength of bricks depends on the soil used to make the bricks, method and making process, burning of bricks. Since the nature of the soil varies from region to region, the average strength of bricks also varies from region to region.

The permissible compressive stress of brick masonry depend upon several factors such as,

1. Type of bricks (1st class, 2nd class, 3rd class)

2. Strength of bricks

3. Size and shape of the masonry construction.

4. Mix of mortar.

5. uniformity of bricks

6. Workmanship.

7. The method adopted for laying bricks.

There are some useful checklists which can be applied to increase the strength of brick masonry.

1 Visual check – The bricks to be used should be good quality, burnt well with uniform shape, size, and color.

2 A metallic ringing sound should be produced when striking two bricks with each other.

3 A good quality brick will not break if dropped from one meter height.

4 A good brick should not absorb water more than 20% (By its weight) while submerged in water for 24 hours.

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Composition of Cement Clinker

The various constituents combine in burning and form cement clinker. The compounds formed in the burning process have the properties of setting and hardening in the presence of water. They are known as Bogue compounds after the name of Bogue who identified them. Le-Chatelier and Tornebohm have referred these compounds as Alite (C3S), Belite (C2S), Celite (C3A) and Felite (C4AF). The following Bogue compounds are formed during clinkering process. The properties of Portland cement varies markedly with the proportions of the above four compounds, reflecting substantial difference between their individual behaviour. Tricalcium Silicate :- It is supposed to be the best cementing material and is well burnt cement. It is about 25-50% (normally about 40 per cent) of cement. It renders the clinker easier to grind, increases resistance to freezing and thawing, hydrates rapidly generating high heat and develops an early ha...

Types of bonds generally used in brick masonry.

Brick masonry is built with bricks bonded together with mortar. For temporary sheds mud mortar may be used but for all permanent buildings lime or cement mortars are used. The various types of bonds generally used in brick masonry are 1. Stretcher bond 2. Header bond 3. English bond and 4. Flemish bond. Stretcher Bond: A stretcher is the longer face of the brick as seen in the elevation. In the brick of size 190 mm × 90 mm × 90 mm, 190 mm × 90 mm face is the stretcher. However care should be taken to break vertical joints. This type of construction is useful for the construction half brick thick partition wall.This bond is sometimes known as running bond. This bond is the simplest bond that is used today, this bond is not suitable as a stand alone structural wall and a structural wall built directly behind it, fixed with wall ties would be needed. Header Bond A header is the shorter face of the brick as seen in the elevation. In a standard...

1cum 250mm THICK BRICK WORK CALCULATION

1cum 250mm THICK BRICK WORK CALCULATION Brick size with mortar :- 250mm*125mm*75mm Volume of 1 brick with mortar:- 0.250*0.125*0.075 = 0.00234cum. Brick size with out mortar :- 240mm*115mm*65mm Volume of 1brick without mortar :- 0.240*0.115*0.065 = 0.00179. Nos of brick in 1cum with mortar:- 1/0.00234 = 427.4 = 427 Volume of 427nos brick without mortar:- 427*0.00179 = 0.76 cum Required of cement mortar :- 1-0.76 = 0.24cum. Now Dry volume of mortar :- 0.24*1.33 = 0.32 cum We know the mortar ratio :- 1:6 So, Cement :- 0.32*1/7*1440 kg = 65.8 = 66 kg Sand :- 0.32*6/7 cum = 0.27 cum.

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