Savings Example 1
A Commercial Development of a Six Storey Concrete Frame, Each Floor 1500 m2
Material Cost Savings
On a project which was originally designed in traditional cut and bent reinforcement, with a density of 175 kg/m3 and a 300mm thick slab, a Bamtec redesign could produce a reinforcement density of only 114kg/m3 (a saving of 35 %).
Accordingly, the original cut and bent requirement of 78.75t per floor is reduced by the Hy-Ten redesign to 51.3t of Bamtec per floor.
Based on an example market rate for cut and bent reinforcement of £450 per tonne, the original cost for the 78.75t would be £35,438.
Bamtec is charged at a premium over and above cut and bent of approx. £130 per tonne (covering the manufacture of the carpets, redesign of the slab and the production of all drawings). So the cost of the 51.3t of Bamtec would be £29,754, giving a steel cost saving per floor of £5,684.
Fixing Cost Savings
Hy-Ten is able to supply large, quick to install carpets whose size is unrestricted by column centers. This is because we supply free of charge couplers for all internal column starter bars.
Contractors report that on sites where they would have been charged approx. £270/t to fix cut and bent slab reinforcement they are currently being charged £120/t for the fixing of Bamtec.
Given the above, the original 78.75t of cut and bent would have cost £21,263 to fix and the redesigned Bamtec requirement of 51.3t would cost £6156, resulting in a fixing cost saving of £15,107.
If good quality high chairs and plastic spacer blocks (tric trac) are used to support Bamtec, we recommend they are placed at 600mm centers as opposed to the usual 1000mm centres. We make this recommendation because Bamtec carpets can weigh up to 1.7t.
This reduction in centres increases the cost of the high chairs and tric trac by two thirds. So if the cost was originally £1 per m2, it will be £1.67 per m2. Using the above example this will increase accessory costs by £1005 per floor (£0.67 x 1500m2).
£5,684 steel cost saving + £15,107 fixing cost saving - £1005 accessory cost increase = £19,786 per floor
This is before savings resulting from programme acceleration - our Bamtec customers report real savings in cycle time and it is not unusual to save a week per floor on a project like the above example.