From the Desk of Executive Director

 

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  Brick Foundation in Cement Mortar 1:8
System Components
Initial Cost Structure
 
 
DESIGN EXAMPLE : Foundation for a TWO storey Building
 
 
Maximum width required = 2 x width of the wall +0. 3m
(Assuming 23cm thick brick wall) = 2 x 0.23 + 0.3 m.
                                                = 0.76m.
 
 
Minimum Depth Required = 
 
 
Assuming P
Safe permissible pressure on base) = 175 KN/sqm
 
W (weight of soil)                           = 18 KN/sqm
 
Angle of repose of the soil = 30 = 175/18x0.111 = 1 m.
 
Assuming bearing capacity of soil  = 200 Km/sqm
Width required                             = 175/200 = 0.85m
 
Thus provide a foundation width  = 85cm and depth 100 cm
 
Critical Factors
 
1. Curing
2. Width and stepping of foundation
3. Breaking of vertical joints
4. Quality of sand for mortar
5. Availability and cost of bricks
 
Tools Used
 
1. Trowels
2. Plumb bob 
3. Thread
4. Pans
5. Shovel
6. Pick axes
7. Baskets
 
DO’S
 
DON’T’S
 
·      Curing of masonry should be done on seven days
·      Vertical masonry joints should be properly broken
·      Masonry should be stepped after one day’s construction
·      Mortar should be used within 30 minutes of adding water to the mix.
 
·      Fine sand should not be used in mortar
·      Height of masonry construction should not be more than 1m per day
·      Masonry should not be allowed to dry out quickly
 
 
 
 
 
References : IS : 1080 – 1980 Simple Strip Foundation; IS : 1904 – 1973 Shallow Foundations; IS : 1077 : 1986 Bricks; IS : 2212 : 1962 Brick Work; National Building Code of India : 1983 Part VI : Sector 2; IS 2250 : 1981 Mortars .

 
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