COMPRESSIVE STRENGTH
OBJECTIVE
For determination of compressive
strength of bricks
REFERENCE STANDARD
IS: 3495 – P (1)-1992-Methods of
tests of burnt clay building bricks (Determination of compressive strength)
EQUIPMENT & APPARATUS
§ Compression Testing Machine
§ Scale for measuring dimension of brick
fig:-Showing
Brick sample in compressive testing machine
PROCEDURE
1.
Unevenness observed in the bed faces
of bricks is removed to provide two smooth and parallel faces by grinding. It
is immersed in water at room temperature for 24 h.
2.
The specimen is then removed and any
surplus moisture is drained out at room temperature. The frog and all voids in
the bed face is filled with cement mortar (1 cement, clean coarse sand of grade
3 mm and down). It is stored under the damp jute bags for 24 h followed by
immersion in clean water for 3 days.
3.
The specimen is placed with flat
faces horizontal, and mortar filled face facing upwards between two 3 ply
plywood sheets each of 3 mm thickness and carefully centered between plates of
testing machine.
4.
Load is applied axially at a uniform
rate of 14 N/mm2 per minute till failure occurs. The maximum
load at failure is noted down. The load at failure is considered the maximum
load at which the specimen fails to produce any further increase in the
indicator reading on the testing machine.
Table:- Compressive strength of bricks
S.No.
|
Length
in cm
|
Width in
cm
|
Area in
mm2
|
Load in
KN
|
Comp.
st, in kg/cm2
|
Avg. st.
in kg/cm2
|
1
|
|
|
|
|
|
|
2
|
|
|
|
|
|
|
3
|
|
|
|
|
|
|
4
|
|
|
|
|
|
|
5
|
|
|
|
|
|
|
CALCULATION
PRECAUTIONS
§ Safety shoes should be used at the time of testing.
§
Before testing, CTM machine should
be properly checked.
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