|
|
|
|
RANDOM RUBBLE STONE FOUNDATION IN MUD MORTAR
|
|
System Components
|
Initial Cost Structure
|
|
|
· Local Economy component = 51 %
· Foundation in RRM in mud mortar of 450 x 450mm over 600 x 600 footing in granite stone
|
|
DESIGN EXAMPLE : Foundation for a single 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) = 125 KN/sqm
W (weight of soil) = 18 KN/sqm
Angle of repose of the soil = 30 = 125/18x0.111= 0.77 m.
Assuming bearing capacity of soil = 200 Km/sqm
Width required = 125/200 = 0.625m
Thus provide a foundation width = 76 cm and depth 77 cm
|
|
|
Critical Factors
1. Quality of soil
2. Width and stepping of foundation
3. Providing through stones
4. Protection from water
5. Inter‐locking at corners
|
Tools Used
1. Trowels
2. Plumb bob
3. Thread
4. Pans
5. Shovel
6. Pick axes
7. Baskets
|
|
DO’S
|
DON’T’S
|
|
1. Soil should have medium plasticity
2. Thorough stones should be provided
3. Natural bed of stone should be always
Perpendicular to the loading.
|
1. Sand and clay should be used for mortar
2. Rounded stone should not be used for
Masonary
3. Masonry should not be allowed to dry out quickly
4. Bonding of the wall should not be filled with small stone pieces
|
|
|
|
|