Mild Steel Square
 Allstar Performance 2" x 3" Square Steel End Cap Mild Steel 10 Pack All22294 US $21.99 
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slab design HELLPPP!!!?
What is the difference designing a slab with high steel reinforcement as opposed to mild steel reinforcement? When should the formula w*(l squared)/2 used and w*(l squared)/8.
For a suspended slab, there are a number of designs to improve the strength-to-weight ratio. In all cases the top surface remains flat, and the underside is modulated:
Corrugated, usually where the concrete is poured into a corrugated steel tray. This improves strength and prevents the slab bending under its own weight. The corrugations run across the short dimension, from side to side.
A ribbed slab, giving considerable extra strength on one direction.
A waffle slab, giving added strength in both directions.
Reinforcement design
A one way slab needs moment resisting reinforcement only in its short-direction. Because, the moment along long axes is so small that it can be neglected. When the ratio of the length of long direction to short direction of a slab is greater than 2 it can be considered as a one way slab.
A two way slabneeds moment resisting reinforcement in both directions. If the ratio of the lengths of long and short side is less than one then moment in both direction should be considered in design.
This online course in slab design may help
http://www.pdhonline.org/courses/s132/s132.htm
The may be good sources as well
http://www.wirereinforcementinstitute.org/pages/pubs/pdf/Whysteel.pdf
http://en.wikipedia.org/wiki/Concrete_slab
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