For the same crack width design, the use of one layer of mesh (7.5mm wires at 150 c/c transversely and 100mm c/c longitudinally) plus Dramix®, resulted in a cost effective solution that was simpler and quicker to construct.
A conventionally reinforced solution would have required 2 layers of reinforcing bars to ensure a crack width of 0.2mm.
To achieve the same crack width, the Dramix® Combi Slab solution only required one layer of bars plus Dramix®. A simpler, faster and more cost effective option to construct.
Leakage of containment bunds can be an issue and costly to put right. Typical design and construction has sealed joints and expensive water stops. However, if the bund cracks outside these control points then there commonly isn’t enough reinforcing to control them to acceptable levels. Alternatively, heavy top and bottom reinforcing can be used to reduce the number of joints, this is expensive and difficult and time consuming to construct.
TYPE OF APPLICATION:
Joint free liquid tight slab
2012:
North Island, New Zealand
This project required a joint free watertight slab to support tanks containing water and fertilizer. This required a crack width calculation of 0.2mm.
SA Water engaged SMEC Engineering to design a 400m long flood channel to cope with a high water flow of 20m/sec. A channel of this size poses numerous detailing and construction issues, however the adoption of the Dramix Combi Slab solution ensured simplification of the traditional steel, removal of water stop joints, allowed for a quicker construction programme and met the required crack width requirement of 0.2mm.
LOCATION:
Reclaimed land which couldn’t support a slab on grade