Litecrete is a ready to use, versatile lightweight construction concrete. Litecrete materials have been designed for application internally or externally. The product range is based on a blend of special cements, microsilica, polystyrene beads, clay granules, alkali resistant glass fibers and LCK-Mix. Due to careful selection of the composite materials, the product is very stable once mixed allowing pumping under water. Once set the material is suitable for use in even the harshest environments such as offshore construction.
As with all repairs & applications it is essential to apply to a clean, sound surface free from grease, oil, dust & loose material. Litecrete can be applied to unprimed & the majority of primed steelwork & re-bar. Due to Litecrete’s cement base, alkali sensitive primers or paints should be removed prior to application. 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 Litecrete application. Ideally surfaces should be grit blasted and then degreased. 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 substrate to be covered should be drenched with clean water prior to the application of Litecrete to ensure the best bond possible. In some in-stances, there may be the requirement to install mesh prior to application of Litecrete to allow even distribution of stresses created by thermal loading or shrinkage. Lightcem can advise on this. All shuttering material faces that will be in contact with Litecrete should be coated with a mold release agent prior to pouring the Litecrete. One of the significant advantages of Litecrete in shuttering work is the much lower wet density of the material in comparison with standard concrete. This in turn imparts lower forces on the shuttering therefore requiring reduced support requirements or increased pour rates.
This is influenced by mixing, pumping technique & distance, which will affect the ap-plied density. The wastage factor will depend on such details as the degree of site control, size & shape of the pour as well as pumping distances. This can best be determined by experience.
METHOD OF APPLICATION:
Pumped application must be carried out by contractors (with suitably trained operatives) recognized by Lightcem Technology Ltd. Litecrete products should be applied in accordance with the latest "Instructions for Application" available from Lightcem technology ltd. (Download tab)
Litecrete 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 majority of the water to the mixer prior to adding the Litecrete; add the remaining water during mixing to reach de-sired consistency. Litecrete must be mixed for a minimum of 5 minutes to ensure correct performance. When filling repair areas, avoid feathering edges by cutting back at least 10m around the area to be filled if required. Substrate movement joints should be contin-ued through the Litecrete layer and suitably sealed. Pumps such as Putzmeister P11 may be used for placement. Standard concrete placement procedures apply when using Lightcem products & all personnel should be trained to the required standard. If the use of piston pumps is intended, Lightcem should be consulted as to the suitability of intended pump.
Levelling and initial finishing should be carried out using a wooden or plastic float immediately after placement has finished. Surface overworking should be avoided as it may result in cracking.
Good curing is essential. Particular care is required in hot and/or windy condi-tions. Curing can either be with a coat of spray applied curing membrane (Febcure), or by covering the area with plastic sheet or wet hessian, if the area is to subsequently receive an overcoat.
Litecrete has been designed as a durable lightweight construction concrete. It is particularly suitable for floating and offshore construction. Where weight savings are required for columns, walls, roofs and foundations. Litecrete can be used as a costeffective solution. Reduced density also means reduced loading on shutters when pouring therefore, false-work and form-work costs can be reduced.
Litecrete comes in grades created with a selection of strengths available to suit the requirements of the application. With these strength variations come differing densities and thermal properties, which may be the characteristic, required. Press the Technical Specifications button above to dispay the varying characteristics of the products. For further assistance in selection of the correct product, please contact Lightcem who will happily answer any further questions.
For health, safety and environmental information, View/download the HSE-document from the downloads tab above.
All equipment and tools should be cleaned once work is completed or during extended breaks.
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.