Silica Røg til Beton
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Silica Røg til Beton
At være et effektivt puzzolanmateriale, silica dampe tilsættes almindeligvis til beton for at forbedre dets egenskaber, især bindingsstyrke, trykstyrke, og korrosionsbestandighed.
- Silica røg præsenterer en neutral uorganisk fyldstof med utrolig stabil kemiske og fysiske egenskaber. Det deltager ikke i hærdningsreaktionen, indeholder ikke krystallinsk vand, og påvirker ikke reaktionsstofskiftet.
- Tilsætning af silica-røg til beton kan øge termisk ledningsevne og flammehæmmende middel, samt ændre klæbemiddelviskositeten.
- Det har stor adsorptionsydelse, producerer intet agglomerationsfænomen, er let at blande, og tilbyder god infiltration til forskellige typer harpiks.
- Tilsætningen af silica-røg gør det muligt at reducere epoxyharpiksens eksoterme spidstemperatur ved hærdningsreaktionen, krympningshastigheden af størknede produkter, og deres lineære ekspansionskoefficient. Dette gør det muligt at forhindre revner ved at eliminere indre stress.
Anvendelser af silicadampe i beton
Silica Fume Concrete Properties
Pozzolanic Reaction
Silica Fume Concrete reacts with lime during cement hydration to form additional calcium silicate hydrates
(C-S-H gel) which bonds the components together creating a dense matrix.
Styrke
Silica Fume Concrete improves component packing and adhesion, which has a direct impact on the mechanical properties, especially on strength.
Alkali Reaction
Silica Fume Concrete protects the concrete against the alkali reaction. Its fine and amorphous
particles react with cement alkalies and reduce their content in the concrete before hardening.
Porosity/ Permeability/ Resistance to Corrosion
Addition of Silica Fume Concrete reduces porosity by decreasing pore size. Porosity and permeability reductions inhibit the penetration of aggressive agents. The use of Silica Fume Concrete is beneficial
to prevent concrete from corrosion in difficult environments: havne, airports, chemical areas, and coastal buildings are common examples.
Filler Effect
Silica Fume Concrete is 100 til 150 times smaller than a cement particle and can fill the interstitial voids. The packing effect reduces strongly the concretes porosity and permeability.
Freeze-Thaw
By reducing concrete permeability, Silica Fume Concrete reduces water movements and internal pressures leading to irreversible degradation.
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Silica Røg Anvendelser
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