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Thursday, February 21, 2019

Cement mortar calculation in brick masonry


CALCULATION OF MATERIALS REQUIRED FOR BRICK WORK WITH STANDARD BRICKS FOR 10 CUM OF WORK.

Cement mortar calculation in brick masonry

BRICK:

Considering a wall 1½ brick thick, 30 cm nominal thickness of length 15 m and height of 5 m.
Ø  Total Nominal Volume = 15m × 0.3m (30 cm) × 5m = 22.5 cum.
Normally for brickwork, mortar joint will be less than 1 cm (1 m), taking 1 cm mortar joint, the thickness of the wall will be 29 cm.
Ø  Hence, the Actual Volume = 15m × 0.29m (29 cm) × 5m = 21.75 cum.
The Nominal size of a Standard Brick = 20 cm × 10 cm × 10 cm
Ø  Then, the Volume of a Standard Brick of Nominal Size= 0.20m × 0.10m × 0.10m = 0.002 cum.
Ø  Therefore, the Number of Standard Bricks for Actual Volume (21.75 cu m.) –
Cement mortar calculation in brick masonry
Ø  Hence, Number of Brick required per cu m. (Nominal) –
Cement mortar calculation in brick masonry


Ø  Considering 5% breakages, wastage, etc., then Number of Brick required per cu m. = 507 nos, this may be taken as 500 nos. per cum.

v  For 10 cum. Of Brickwork (500x10) 5000 nos Brick are required.

MORTAR:

Ø  Mortar requirement for Brickwork –
= (Total Actual Volume of Brickwork – Net Volume of Bricks)
= 21.75 – (10875×0.19×0.09×0.09)
= 21.75 – 16.737
= 5.013 cum.
Ø  15% extra Mortar considering for frog filling, for use of cut bricks, for bonding, for uniform joints, wastage etc., hence, the Total Volume the Mortar –

= Mortar requirement for Brickwork + (Mortar requirement for Brickwork × 15%)
= 5.013 + (5.013×15%)
= 5.765 cum.
Ø  For dry volume increased by ¼ dry volume of Mortar –
= Total Volume the Mortar + (Total Volume the Mortar × ¼)
= 5.765 × (5.765 × ¼)
= 7.206 cum.
For 22.5 cum. of Brickwork, dry volume of mortar = 7.206 cum.
v  For 10 cum of brickwork, Dry Volume of mortar = 7.206 × (10/22.5) = 3.203 cum.
Ø  In practice, for cement mortar 3 cum. dry mortar and lime mortar 3.5 cum of dry mortar are taken for 10 cum. brickwork, an approximate 30% of total brickwork quantity may be taken for dry mortar.

Calculation of Material of Mortar

To calculate the Material for Mortarconsidering proportion of material = 1:6
Ø  For 10 cum. of brick work dry volume of mortar = 3 cum.
Ø  Cement: Sand = 1:6
Ø  Cement + Sand = 1 + 6 = 7
Ø  For Cement –
Cement mortar calculation in brick masonry

Ø  For Sand –

Cement mortar calculation in brick masonry






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