Basic Points
A)
Bricks
1)
Bricks should be soak in water for 1
hour and spary water before use.
2)
For masonary work – 1 part cement and
6parts sand.
3)
The bricks should be laid alternate
header and stretcher pattern
For block only stretcher pattern
The vertical joints should be
staaaered
4)
The joints in bricks bulky filled
with morter of 10-12mm
5)
For half partition bricks wall or
100mm thik wall place 6mm diameter rebar in every 4th course
6)
The masonary wall should not raise 1
m height in day.
7)
Masonary wall cured for 10 days.
B)
Aggregate
1)
The size between 4.75mm to 80mm are
coarse aggregate
2)
The rougn and non glacy surface
aggregate are considered best for construction
3)
Angular aggregate assure high
compressive strength in concreate because of the inter locking the angular
aggregate due to their hisher specific surface area .
4)
The aggregate should not absorb water
more than 10% of their weight (after 24 hr)
5)
Flaky/ thin, elongate / long
aggregate not more than 35% by weight of total quantity.
6)
For RCC works 20mm and down size of
aggregates.
7)
For 20mm and 10mm the combined ratio
is 60:40 or 70:30
Development length:
“The embedded length in
concrete is called development length. The minimum length of steel bars
necessary on either side od section to develop bond is called as development
length.”
Note: for HYSB steel
bars increase value for mild steel by 60%
Overlapping length:
The lap of bar needed
to transfer the stressen to other bar. Lap length is provided for overlapping
two rebars in order to salely transfer the load from one bar to another
1)
Beams and slabs: 60d
2)
Column : 45d
Bend:
The anchorage value of
bend shall be taken as for each 45degree bend, 4 times diameter of bar to
maximum upto 10 diameter of bars
