Or Similar Approved Material Specifications – CFRP Strengthening Plates

Mechanical properties of FRP materials used for composite strengthening are likely to vary between products manufactured in different facilities.  To technically assess similar products to confirm approval for use a specifier must obtainactual properties from the plate manufacturer.

Concrete Society Report TR55 defines that ‘Characteristic rather than mean values should be used for design purposes’ when it comes to material properties.  The document defines characteristic property as the mean value less 2xStandard deviation, based on a minimum sample size of 8.

Due to production methods, the mean values can vary from batch to batch,even from the same manufacturer, so the characteristic property is a dynamic figure, depending on the variability of the fibre properties used in production and the volume of continuous fibres in a cross section capable of contibuting to the property of that sample. A knowledgable supplier is unlikely to place a characteristic property on a datasheet, due to the dynamic nature of the calculation of that property, and instead is likely to state a minimum.

With the above in mind the specifier, when assessing equivalence of technically similar looking materials, should check with the manufacturers for the latest figures for a product, to obtain up to date characteristic properties. The method of testing, number of and dates of sample tests should be provided to confirm these calculations.

The normally available characteristic properties from manufacturers are tensile strength, modulus of elasticity and elongation at break.

Saint-Gobain Acquisition of Sika

Whilst details are still pretty limited it does appear that Saint Gobain have aquired a control in Sika.

What does this mean in the UK for the 2 companies?

The Sika Board and Group Management have identified 2 product areas where there will be direct competition between the 2 companies, technical mortars and tile adhesives.

Whilst globally this may be an issue, how big an issue is it to the companies in the UK?

The definition of technical mortars is very subjective, but if we assume this means renders, repair systems and grouts in the UK where are the areas of compitition?

  • Saint Gobain, mainly through there weber brand, have a high level of market share in the External Wall Insulation market, which is a market Sika is absent from!
  • Sika has a strong market share in repair systems and are market leaders with some of its corrosion control systems, whilst the weber brand is present in this market in the form of flowable concrete and sprayed concrete, it is generally used in the commodity end of the product range.
  • Grouts products, whilst high volume are very low value materials. This is a strength of weber. Sika have struggled for many years to compete in this market and in recent times have all but withdrawn from it!

Tile adhesives in the UK are dominated by several companies such as weber and ardex to name a few, but for Sika in the UK this product area is a relatively small market, generally only exisiting in the portfolio to provide a full range of products to major customers such as DIY retailers and builders merchants.

Will there be a conflict between the 2 companies in the UK in tile adhesives and technical mortars, well not really! Several years ago this would have been a major issue, but both companies have found there own route through the markets and there startegies have diverged.

Saint Gobain with its weber brand has a very effective production facility for the products produced for the technical mortars and tile adhesive segments, whilst Sika have a smaller production facility that is without doubt more expensive to run and produce for this area.

My guess will be that the synergies Saint Gobain  are looking for from the aquisition, in the UK market, will be support function based with a particular emphasis on production of the materials. The conflict of interest mentioned by the Sika Board, may simply not exist in the UK market, and the divergant strategies of the 2 companies may mean a strong market position, without duplication of effort and resources.

Watch this space to see how this one pans out!

Structural Strengthening – Carbon Fibre Plate Bonding

Why do structures need strengthening?

Change of use giving an increased loading
Inadequate design
Poor quality construction
Structural damage
Fire damage
Seismic Loading
Reinforcement Corrosion (If cause treated)
Loss of prestress force

Structural Strengthening Product Data Sheets

Why is it so difficult to get find all the Product Data Sheets for CFRP Plates and Structural Adhesive materials which are available in the UK Market for Structural Strengthening Systems? Many of the major suppliers dont have them readily available on there websites.

Below is a selection of the key products which are generally available in the UK, from Sika, Weber and Mapei. You will probably notice that not all of them are from a UK website, so I hope they are correct. These products are generally for use on concrete structures for flexural strengthening

Click to access Sikadur%2030%20PDS%20(CE).pdf


Click to access carbodur_structstrength.pdf


Click to access 10.010_weber.tec_force_carbon_plate.pdf


Click to access 02.020_weber.tec_EP_structural_adhesive_04.pdf


Click to access 1001_carboplate_gb.pdf


Click to access 1006_mapewrap_11-12_gb.pdf

Next step is to do a product comparision which will appear on the website.