Fire protection of load bearing steel constructions.
Fireshield 1150 is one of a range of fire proofing and insulating lightweight concretes that have been tested under fire conditions of up to 1150°C for durations of up to four hours. The product is a cement-based mortar containing high performance cement, microsilica, polystyrene beads, alkali resistant glass fibers and LCK-Mix. Fireshield 1150’s performance does not rely on asbestos or other mineral fibers. A significant benefit of Fireshield material is that it can be used for spray application as well as pouring or trowelling. This removes the need for obtaining a range of materials to cover all requirements. Fireshield 1150 can be delivered in a variety of colors.
Fireshield 1150 is ideal for use in offshore conditions, shipbuilding, petrochemical applications & the construction industries where steel & concrete struc-tures need protection from extreme temperatures (up to
1150°C). It can be used where there is exposure to fire or where reduced material density is required. Fireshield offers excellent effective durable insulation over a range of thicknesses from 10mm to 100mm.
As with all repairs & applications it is essential to apply to a clean, sound surface free from grease, oil, dust & loose material. Fireshield 1150 can be applied to unprimed & the majority of primed steel-work. Due to Fireshield 1150’s cement base, alkali sensitive primers or paints should be removed prior to application of the product, if the paint cannot be removed, a sealing coat should be applied (see Lightcem for advice). All loose rust or paint should be removed prior to Fireshield 1150 application. Concrete substrates must be adequately prepared, all surfaces containing grease or oil should be cleaned with detergent & care taken to ensure the oil/grease is removed and not spread around. The face to be sprayed should be drenched with clean water prior to the application of Fireshield to ensure the best bond possible.
This is influenced by mixing, pumping & spraying techniques, which will affect the applied density. The wastage factor will depend on such details as the degree of site control, size & shape of items being sprayed & frequency of stoppa
METHOD OF APPLICATION
Sprayed application must be carried out by an Applicator recognized by Lightcem Technology Ltd. Fireshield 1150 should be applied in accordance with the latest “Instructions for Application” availa-ble from Lightcem Technology Ltd (www.lightcem.co.uk). Further guidance can be obtained from The Good Practice Guide produced by the Sprayed Concrete Association.
Fireshield 1150 must be mixed with potable water by mechanical means, such as forced action mixers (Cretangle) or slow speed drill paddle mixers. Mixers attached to pumps are also suitable. Add the ma-jority of the water to the mixer prior to adding the Fireshield 1150, add the remaining water during mixing to reach desired consistency. Fireshield 1150 must be mixed for a minimum of 5 minutes to ensure correct performance. The amount of water required may vary according to ambient temperature & relative humidity. Fireshield 1150 can be applied by pumping or spraying as well as by hand/trowel. Pumps such as Putzmeister P11 or Meyco Daguna’s may be used for spray application. Levelling and initial finishing should be carried out using a wooden or plastic float with final finishing completed with a steel float once Fireshield has started to set. Surface overworking may result in cracking.
Good curing is essential. Particular care is required in hot and/or windy conditions. Curing can either be with a coat of spray applied curing membrane (Febcure WB), or by covering the area with plastic sheet or wet hessian.
The information given within this product description is based NOT ONLY on work carried out in our own laboratories, but also on practical experience obtained during field work. It is offered without guarantee and no patent is assumed.
All equipment and tools should be cleaned once work is completed or during extended breaks.
For health, safety and environmental information, View/download the HSE-document from the downloads tab above.
Structures protected with Fireshield have undergone fire resistance testing & compliance in approved independent test laboratories in UK, Norway and Holland. Fire resistance test results relate specifically to the exact construction tested & test conditions imposed. To test all possible construction and test variations would clearly be prohibitive. It is therefore necessary to make a sensible evaluation of test results to assess their applicability to untested con-figurations.
Thicknesses to meet specific fire ratings are provid-ed by Lightcem Technology Ltd. Thicknesses for steel structures are usually calculated on the con-cept that the thickness required varies as a function of the ratio of the exposed heated perimeter to cross sectional area of the steel section. This ratio may be referred to as Hp/A, U/F, F/A etc. & is usually expressed in m-1. This method ensures balanced fire protection is achieved with maximum economy.
Fireshield 1150 is durable material suitable for exteri-or & interior use generally without protective top-coat. The effects of water penetration during fire conditions (thermal shock) do not affect Fireshield 1150. Therefore, water hoses and sprinklers will have no adverse effects or cause the material to fall off.