Tuesday, June 7, 2011

French Polish

It is made by dissolving shellac in spirit.It is mainly used in brightening surface of furniture. It is made by

Methylated spirit-3 gallons
Shellac-3 pounds
Copal-0.5 pounds

Procedure of Slump test

It is widely used in site works. The apparatus used in this method is a metallic mould of frustum cone structure having dimension as follows

Top diameter-10cm
Bottom diameter-20cm

1.First mould is placed on a smooth horizontal and rigid surface.
2.Then mould is filled with concrete by rodding in four layer.
3.After rodding top layer the top surface is smoothen by trowel.
4.Then the mould is removed vertically up.
5.After total removal of mould concrete will subside. The amount of subside is the slump of that concrete.

Various Methods of Determining Workability of Cement

1.Slump test
2.Compacting factor test
3.Flow test
4.Kelly ball test
5.Vee Bee test