The compressive strength of clay bricks
This civil engineering article provides detail information to find out the Compressive Strength of Common Burnt Clay bricks.
- S. Packing Plates 10 / 12 mm thick of satisfactory size (250mm x 150 mm) – 2 Nos.
- Plywood sheets 3mm thk /3 ply – 2 nos, CTM.
- Estimating Scale
- Clean sand screened or PP Cement
- Jute cloth
Arrangement of sample
- Note down the measurements of the samples to closest 1mm.
- Eliminate the asymmetry found in the bed faces to arrange two smooth and parallel faces with the use of grinding (rubbing).
- Submerge the samples in the water at room temperature for 24 hours.
- Take out samples and vacates excess moisture. Stuff the frog and voids in the bed faces by applying the cement mortar 1:3 flushed to the surface.
- Preserve under damp jute cloth for 24 hrs and then submerge in water for 3 days.
- Take out the specimen from water and cleanse the marks of moisture.
- Arrange the sample with flat faces horizontally and mortar filled face upward among two ply sheets and necessary packing plates. Set it midpoint cautiously.
- Provide load @ 140 kg /cm2 per minute (30 tonne per minute ), unless the failure takes place.
- Record the highest load at the failure.
Computations & recods
- Compressive Strength, kg /cm2 = Max Load in Kg / Avg area of the bed faces of the sample, cm2.
- Test results should be documented in Format No. A170/MNSR/F-CIVIL/9A.
Compressive Strength of first class brick is 105 kg/cm2.
Compressive Strength of 2nd class brick is 70 kg/cm2.
Compressive Strength of common building brick is 35 kg/cm2.