Information on Substrate We present you a selection of subordinated items, which might find your interest.
Adhesion test Adhesion test    Before any work on cleaned floors is started, a sufficient number of hardening and adhesion tests at various locations must always be carried out. Tensile bond testing devices (e.g. Schenk-Trebel, Herion) have proven to be useful in this regard. As adhesive for the tensile bond punc
Firmness Firmness   The substrate must be sufficiently firm because coatings and toppings, despite their own high inherent strength, cannot offer any load distribution due to the low layer thickness. The compressive strength of concrete and composite screeds can usefully be determined using a bounce hammer
Moisture Moisture   Cement screed and concrete surfaces allow coating materials to be applied only in dry conditions which means a moisture content of less than 4 % which will be the case usually after 28 days. Certain limitations regarding the moisture content might be possible under circumstances dependin
Hollows Hollows Hollow areas, particularly those which have cracks, must be filled with SILIKAL® reactive resin.
Joints Joints   Joints with a low tendency to move must be taken over. They should run straight, be evenly wide and have firm sides. Damages to the sides of joints must be repaired with Silikal reactive mortar. The joint is then sealed with SILIKAL F10 resin.   In most cases, rigid joints can be filled and
Cracks Cracks    On cement-bonded substrates "spiderlyrdquo; surface cracks have no detrimental effects on reactive resin applications; however, they may need to have several coats of primer resin. Continious shrinkage cracks can be sealed up non-positively with filled Silikal reactive resins if shrinkage
Absorbancy Absorbancy    For reactive resins to anchor themselves firmly on the surface of concrete or mortar, their primer must penetrate into the capillary/pore structure of the substrate, which must be correspondingly absorbent. A particularly high absorbancy indicates that the substrate has little strength
Soft and detachable constituents Soft and detachable constituents   Cementitious grout, cement flakes, mortar residue and all surface constituents which do not adhere firmly and indissolubly to the substrate must be removed by chiselling, milling, blasting or grinding before the first reactive resin is applied.
Contamination Contamination Reactive resins will not adhere well to contaminated substrates, if at all. That is why, depending on the type of contamination, the surface must be cleaned wet or dry until all pores are open. Oily and greasy substrates can be cleaned by means of special cleaners with the use of scru
Incorrect vertical position Incorrect vertical position The thickness to which toppings or screeds of reactive resins are laid is not normally sufficient to correct a vertical position that is incorrect. A seperate operation is required.
Evenness Evenness    Thin layers of reactive resin cannot make up for unevenness in the substrate. Unevenness can be compensated by filling with Silikal reactive resin compounds. It may be necessary to apply a Silikal topping to a higher thickness or as an extra intermediate layer.
Concrete Concrete The surface of cement concrete generelly has a fine layer of mortar (cementitious grout) which, because of its low strength and adhesion to the substrate, has to be removed before any reactive resin is applied. The suitable methods for doing so depend on the condition of the substrate: mil
Cement screeds Cement screeds Cement screeds, particularly hard-aggregate screeds, can have such a dense surface that reactive resin primers can scarcely penetrate. The pores of this surface may need to be opened up, e.g. by blasting. In cement screeds, the cementitious grout must be removed by milling or blastin
Ceramic toppings Ceramic toppings Ceramic toppings must be firmly bonded with the substrate. In order to achieve sufficient adhesion between reactive resins and ceramic toppings, their surface may need to be mechanically roughed (e.g. by ball-blasting) under some circumstances (adhesion test !). SILIKAL® RU 727 res
Mastic asphalt screeds Mastic asphalt screeds   Because of their considerable reaction to fluctuations in temperature, mastic asphalt screeds should only be coated in indoor areas. Coatings should only be laid with flexible reactive resins because mastic asphalt can deform or lose its strength under stress and under fluct
Anhydrite and magnesite screeds Anhydrite and magnesite screeds   Anhydrite and magnesite screeds are not resistant to moisture. In the case of reactive resin toppings which are impermeable to water vapour, moisture penetration through the rear and through adjacent elements must be reliable excluded. There is a great risk not only
Metals Metals Under Swedish Standard SA 2.5 prepared metal substrates, being non-absorbant, must be pretreated with a special primer coat. SILIKAL® RU 727 resin with the addition of SILIKAL® Additive M adhesion promotor is used to this end. Metal substrates should only be coated with flexible reactive res

Manufacturer's information

Silikal GmbH
Ostring 23 D 63533 Mainhausen

Tel. (0)6182 92350
Fax (0)6182 923538
Internet  www.silikal.com
Category Construction chemistry / Coatings / Plaster

Reactive resins and polymer concrete for industrial floorings and civil engineering

Last modified 14.09.2017   Texts 78