Bs En 7721 Pdf -

: Surfaces must be flat and parallel. If they are not, they may need to be ground down or capped with a compensating layer like gypsum plaster. Conditioning

Masonry units cannot simply be pulled off the pallet and crushed. The standard specifies how the units must be prepared. This usually involves drying the units in an oven until they reach a constant mass, ensuring that moisture does not skew the results. bs en 7721 pdf

: Ensures that repairs meet the same reliability and consistency standards as the original manufacturing process. : Surfaces must be flat and parallel

: The unit is centered on the platens of a compression testing machine. A uniform load is applied and increased continuously until the unit fails or "crushes". bs en 7721 pdf