A. Whether it has been cast at site or cast previously somewhere else:
1.Cast in situ:
Most of the concrete done at site falls under this group. The formwork is erected and concrete poured in the form work and later on centering or shuttering is removed .
2.1 Man hole covers, Lintels , Cover blocks are cast in the yard and then shifted to the location and placed in position.
2.2.Entire columns, wall panels & slabs are cast at the factory & transported to the site and installed.
2.3 Preacast prestressed ( Pre-tensioned or Post-tensioned ) girders for long span bridges or flyovers are cast either at the yard or factory , transported to the site and erected in position.
B. Whether it has been mixed fresh at site or has been mixed somewhere else and then shifted to the site:
1.Mixed at site:
This is the traditional method where cement, sand & aggregate are stored at site .Proportioned, mixed,shifted & placed at the desired element.
2.Mixed at a central batching plant:
This is the comparatively new method where cement, sand & aggregate are stored ,proportioned and mixed at a batching plant, shifted to the site by transit mixers & placed at the desired element.
C. Whether ingredients have been proportioned by volume or by weight:
1. Volumetric batching:
D. Whether the ratio of ingredients has been decided by imperial methods or by scientific analysis :
E. Whether the ratio of ingredients has been decided by imperial methods or by scientific analysis :
F. Whether the concrete is fluid or it is quite rigid :
G. Whether the concrete is fresh or it is quite old :
H. Whether the concrete is plain or reinforced or prestressed :
1.Plain cement concrete
2.Reinforced cement concrete
For bring the discussion to the present tense, all the columns above the basement were cast as follows :