Civil Engineering Reference
In-Depth Information
and limestone can only be used above ground level; all other types of stone can
be used both above and below ground level.
Free lying stones or stones from quarries can be used. Quarry stone can be
divided into the following categories:
•
Normal quarry stone
which has been lightly worked;
•
Squared stone
which is produced in rectangular form and has rough sur-
faces
•
Cut stone
which is also rectangular, but the surfaces are smoothly cut.
The last two types are often called rough or fine-squared stone. If the dimensions
of the stone are greater than 20
40 cm, it is too heavy to be lifted manu-
ally and must be placed by crane. Stone should dry for two months before being
used.
Cutting granite, gneiss, sandstone and different slates releases quartz dust,
which can cause serious lung damage.
20
Figure 13.8: Examples of the structural use of stone.
