Tests on Bricks
The following laboratory tests is also conducted on the bricks to search out their suitability:
(i) Crushing strength
(iii) Shape and size
(i) Crushing Strength:
The brick specimen are immersed in water for twenty-four hours. The frog of the brick is stuffed flush with 1:3 cement mortar and also the specimen is hold on in damp jute bag for twenty-four hours and so immersed in clean water for twenty-four hours. The specimen is placed in compression testing machine with VI metric linear unit ply board on prime and bottom of it to induce uniform load on the specimen. Then load is applied axially at a standardized rate of fourteen N/mm2. The crushing load is noted. Then the crushing strength is that the magnitude relation of crushing load to the world of brick loaded. Average of 5 specimen is taken because the crushing strength.
Then load is applied axially at a standardized rate of fourteen N/mm2. The crushing load is noted. Then the crushing strength is that the magnitude relation of crushing load to the world of brick loaded. Average of 5 specimen is taken because the crushing strength.
(ii) Absorption Test:
Brick specimen are weighed dry. Then they’re immersed in water for an amount of twenty four hours. The specimen are taken out and wiped with artefact. The burden of every specimen in wet condition is decided. The distinction in weight indicate the water absorbed. Then the proportion absorption is that the magnitude relation of water absorbed to dry weight increased by one hundred. The typical of 5 specimen is taken. This worth shouldn’t exceed twenty per cent.
(iii) Shape and Size:
Bricks ought to be of ordinary size and edges ought to be actually rectangular with sharp edges. To ascertain it, twenty bricks are selected indiscriminately and that they are stacked on the length, on the dimension and so on the peak. For the quality bricks of size one hundred ninety metric linear unit × ninety metric linear unit × ninety metric linear unit. IS code permits the subsequent limits:
Lengthwise: 3680 to 3920 metric linear unit
Widthwise: 1740 to 1860 metric linear unit
Heightwise: 1740 to 1860 metric linear unit.
The following field tests facilitate in ascertaining the nice quality bricks:
(i) Uniformity in size
(ii) Uniformity in color
(iv) Hardness check
(v) Sound check
(vi) Strength check.
(i) Uniformity in Size:
A good brick ought to have rectangular plane surface and uniform in size. This check is formed within the field by observation.
(ii) Uniformity in Color:
A good brick are having uniform color throughout. This observation is also created before buying the brick.
A few bricks is also broken the sector and their crosswise ascertained. The section ought to be same, compact and free from defects like holes and lumps.
(iv) Sound Test:
If 2 bricks are stricken with one another they ought to manufacture clear ringing sound. The sound shouldn’t be uninteresting.
(v) Hardness Test:
For this a straightforward field trial is scratch the brick with nail. If no impression is marked on the surface, the brick is sufficiently onerous
The presence of alkalis in brick isn’t fascinating as a result of the kind patches of grey powder by riveting wetness. Thus to see the presence of alkalis this check is performed as explained below:
Place the brick specimen during a glass dish containing water to a depth of twenty five metric linear unit during a well-ventilated space. In the end the water is absorbed or gaseous once more add water for a depth of twenty five metric linear unit. When second evaporation observe the bricks for white/grey patches. The observation is rumored as ‘nil’, ‘slight’, ‘moderate’, ‘heavy’ or serious to mean
10% of space lined with deposits
10 to five hundredth space lined with deposit however unaccompanied by flaking of the surface.
More than fifty per cent space lined with deposits however unaccompanied by flaking of the surface.
Heavy deposits of salt in the middle of flaking of the surface.