WARPAGE TEST OF EARTHEN BRICK (IS-3495 (PART-4))

Warpage is defined as bend or twist out of shape, especially from a straight or flat form.

EXPERIMENT

To determine the warpage of earthen or clay brick.

SAMPLING

10 bricks are taken randomly from the lot as a sample for the warping test.

APPARATUS

Warpage of the brick is measured with the help of a flat steel or glass surface and measuring ruler graduated in 0.5 mm divisions or wedge of steel 60 × 15 × 15 mm. 

PROCEDURE

1) Remove any adhering to the surface of brick.

2)  Concave warpage

The flat surface of the brick is placed along the surface to be measured selecting the location that gives the greatest deviation from straightness. The greatest distance of brick surface from the edge of straightness is measured by a steel ruler or wedge.

3)  Convex warpage

The brick is place on the plane surface with the convex surface in contact with the flat surface and the distances of four corners of brick are measured from the flat surface. The largest distance is reported as warpage.

RESULT

The higher of the distance measured in concave and convex warpage tests is reported as warpage.