Kimia S.p.A.

Structural interventions with non-traditional materials

Structural interventions with non-traditional materials

Here you are method statements related to our standard cycles for the above-mentioned kind of intervention

Kimia S.p.A. is among the few companies with over thirty years of experience in the use of resins and composite systems for structural applications. The company has certified, by means of a wide range of experimental tests, the overall performance of the reinforcing systems themselves, correlating the results with the features of each kind of substrate. Since 1983, our solutions are used successfully in prestigious works for interventions that still today are subject of study and analysis.

The compatibility with structures of any type and effectiveness in time of Kimia reinforcement systems is testified by many experimental investigations carried out in collaboration with universities and research institutes in Italy but also by the optimal behavior shown by structures reinforced before seismic events occurred in Italy during the last decade.

Please find a list of method statements available:

► FRP streghtenings with fabrics
► FRP streghtenings with pultruded plates
► Structural connections by reinforced tacking with helical bars
► Reinforcements with steel fabrics and inorganic matrixes
► Reinforcements with carbon fabrics and inorganic matrixes
► Connections of partition walls with glass nets and cement mortars
► Collaborative plasters reinforced with a.r. glass nets
► Collaborative high-tech castings

FRP streghtenings with fabrics

FRP streghtenings with fabrics

If the substrate is sound and not damaged cortically, sandblast the surface to remove all traces of stripping compound, varnish, paint and cement laitance.

On very irregular surfaces, after cleaning and applying the primer Kimicover FIX, apply a regularization layer of a thicknes of at least 1-1,5 cm with structural mortars of Tectoria or Betonfix range mixed with Kimitech B2 latex.

In case of:

  • Structural cracks → Seal them pouring or injecting cement-based or lime-based slurries.
  • Substrates polluted or demaged cortically → remove damaged parts and reconstruct them following the pertinet cycle of interventions. Wait at least three weeks before lying of the FRP reinforcements. If reinforcement must be carried out immediately, repair with Kimitech TX311 (eventually applying it in more than one layer). On the last layer, on wet, it will be possible to directly lay the reinforcement.

All sharp edges must be smoouthed with a demolition hammer o any other suiitable means. It is recommended that the bending radius be not less than 2 cm.

Appy with a brush, roller or airless pump Kimicover FIX primer.

When wet and in any case within 8 hours, apply with a notched trowel an avarage 1 mm thick layer of tixothropic resin Kimitech EP-TX.

On wet, place the reinforcing fabric made out of carbon fiber (Kimitech CB) or glass fiber (Kimitech VR) with grammage, type of weaving and width requested, ensuring no wrinkles are present. Pass over the roller "rullo per compositi" so the air bubbles are eliminated. Unless specified in a different way, stiprs must be overlapped at least 20 cm in case of wrapping of colums or connection among subsequent strips.

Depending on environmental conditions, impregnate the reiforcements applying by brush the fluid resin Kimitech EP-IN (with a longer workability time) or Kimitech EP-IN/50 (faster). To have a better grip for subsequent smoothing products and finishings (if forseen), dust the surface of wet resin with quartz aggregates.

FRP streghtenings with pultruded plates

If the substrate is sound and not damaged cortically sandblast the surface to remove all traces of stripping compound, varnish, paint and cement laitance. On very irregular surfaces, after cleaning and applying the primer Kimicover FIX, apply a regularization layer of a thickness of at least 1-1,5 cm using structural mortars of Tectoria or Betonfix range mixed with Kimitech B2 latex. In case of Structural cracks or Substrates polluted or demaged cortically, proceed as suggested in the previous paragraph. All sharp edges must be smoouthed with a demolition hammer o any other suiitable means. It is recommended that the bending radius be not less than 2 cm.

Appy with a brush, roller or airless pump Kimicover FIX primer. When wet and in any case within subsequent 8 hours, apply with a notched trowel an avarage 1 mm thick layer of tixothropic resin Kimitech EP-TX. With a flat trowel, apply an even layer 1-1,5 mm thick of thixotropic epoxy adhesive Kimitech EP-TX also on the side of the Kimitech PLATE which is to be bonded to the substrate and place the lamina.

Structural connections by reinforced tacking with helical bars

For "dry" connections in structural and non-structural reinforcement systems, proceed as follows.

Make holes in the walls to cross and intercept cracks or portions of walls which need to be connected. The diameter of the holes will be 2 mm less than diameter of the Kimisteel INOX X-BAR to be used (e.g. for a bar f 10, a hole diameter of 8 mm will be made). Cut to size of helical bars and insert by means of a drill with a spindle for helical bars Kimisteel SDS DRILL or manual bar pushers Kimisteel MANUAL DRILL.

Seal the outer edge of the hole, once screwed the bar, with proper Kimitech resins or Betonfix, Limepor, Tectoria mortars.

Structural connections by reinforced tacking with helical bars

Reinforcements with steel fabrics and inorganic matrixes

Remove existing plasters or claddings. Brush the surface to remove all traces of stripping compound, varnish, paint and cement laitance. In case of structural cracks, seal them pouring or injecting cement-based or lime-based slurries.

Once removed existing plasters and regolarized the substrate, apply the reinforcement using the following procedure:

  • apply a coat of primer Kimicover FIX to the substrate;
  • trowel apply Kimisteel LM mortar;
  • if foreseen by the project, roll the terminal part of the high-strength steel fibre fabric Kimisteel INOX or Kimisteel GLV and insert it in previously drilled holes in which the net will be grouted (in case a mechanical fastening has been specified, block the first end of the strip);
  • lay the strip on the fresh mortar;
  • roll the other terminal part of the strip, insert it in the holes previously drilled (in case a tension of the fabric has been specified, pre-tension the strip before blocking the other end);
  • apply another layer of Kimisteel LM so it covers the strengthening fabric evenly;
  • grout the terminal ends of the Kimisteel fabric by mean of adequate cement-based, lime-based or epoxy anchoring grout (if specified by the designer of the project).

Reinforcements with steel fabrics and inorganic matrixes

Reinforcements with carbon fabrics and inorganic matrixes

Remove existing plasters or claddings. Brush the surface to remove all traces of stripping compound, varnish, paint and cement laitance. In case of structural cracks, seal them pouring or injecting cement-based or lime-based slurries.

Once removed existing plasters and regolarized the substrate, apply the reinforcement using the following procedure: apply a coat of primer Kimicover FIX to the substrate; trowel apply Kimisteel LM mortar and lay Kimitech ST 160 R on the fresh mortar; apply another layer of Kimisteel LM so it covers the strengthening fabric evenly.

Connections of partition walls with glass nets and cement mortars

Remove existing plasters or claddings intercepting the contact line among r.c. structural element and the non-structural partition wall to be secured.

Brush the surface to remove all traces of stripping compound, varnish, paint and cement laitance. Wet the area of intervention.

Apply the first layer of two-component mortar Betonfix AQM GG, and on wet place the strengthening mesh Kimitech 550 in position.

Apply passing-troug connections (e.g. Kimisteel CONNECT connectors) to join the 2 faces on which the anti-detachment system is to be applied.

Apply the second layer of mortar Betonfix AQM GG so that it completely covers the reinforcement mesh with an even coat.

Connections of partition walls with glass nets and cement mortars

Collaborative plasters reinforced with a.r. glass nets

Apply the “structural” render Tectoria M10 or Tectoria M15 after adequate preparation of the substrate, on a clean, sound, compact substrate with no crumbly portions and no traces of dust, dirt, mildew or soluble salts.

Hydro-clean the surface to remove all traces of material and substances which could compromise the adhesion of any products or systems applied later.

Apply an initial 5 mm thick scratch-coat of the same product, to even out the absorbency of the substrate and improve adhesion of the render.

Apply Kimitech WALLMESH net, fixed in place to the wall with Kimisteel CONNECT connectors.

Apply a single layer up to 25 mm thick of “structural” render by trowel or with a continuous-feed rendering machine, starting from the bottom working upwards.

If the thickness required is higher than 25 mm, apply the render in several layers. Apply each layer without tamping the previous layer. After applying the render, wait a few minutes and level off the surface using an aluminium H-type or blade-type straight edge by passing over the surface horizontally and vertically until it is flat. Finish off the surface of the render with a damp sponge float.

Collaborative plasters reinforced with a.r. glass nets

Collaborative high-tech castings

Once the vault has to be shored, freed of any debris and carefully cleaned. Any lesion must be filled. Before any further operation, proceed with the positioning of stainless steel perimeter anchors (Kimisteel CONNECT) to be fixed by means of Limepor 100, Betonfix 200/Betonfix200TH mortars or Kimitech F3 resin.

In a sufficiently large container mix Tectoria COCCIOFORTE A and Tectoria COCCIOFORTE B and pour the product into the mixer drum. Put away a portion to use later as an adhesion improver.

C component is composed by traditional aggregates and is available in both “Cocciopesto” and “Ivory” versions.

The C component should be slowly added inside the mixer drum, respecting the prescribed mixing ratios of 1:20 (1 kg binder per 20 kg aggregates). Stir the material until it gets a semi-dry “damp soil” consistency.

Apply by brush the previously retained part of Tectoria COCCIOFORTE A+B mixture, to make a thin layer to promote the adhesion of the next-to-be-applied product.

Pour the mixture over the substrate just treated with adhesion improver (still wet), being careful to evenly distribute the material according to the surface to cover.

Proceed with the laying of Tectoria COCCIOFORTE until the substrate is completerly covered.

In case of groin vaults or domes, the easiest way is using a trowel. In case of groin vaults or domes, the easiest way is using a trowel.

While laying the product, is important to properly embed every perimetral iron bar previously placed.

Then Tectoria COCCIOFORTE has to be compacted over the substrate.

Any next pour doesn’t need any further anchoring.

Collaborative high-tech castings

Info & Technical Support

Other method statements here. If you want to get further info or technical support please fill in the form to get in touch with our Technical Department.

Ing. Diego Aisa, Chief of Export Department

Hello! I am Diego Aisa, I am a structural engineer. I began working for Kimia in 2007. I manage international key contacts and I am Chief of Export Department. I like travelling and I got a thing for photography! Find here my contacts. My Linkedin profile.

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Kimia S.p.A.

Via del Rame, 73
06134 - P.te Felcino
Perugia (PG) - Italia

Phone:
+39 075 591 80 71
Fax:
+39 075 591 33 78
Email: info@kimia.it