CFRP Plates for Strengthening Concrete Structures Technical Data – Tensile Modulus

A review of the current available technical data sheets for  Carboplate from Mapei, CarboDur from Sika and weber.tec force from weber, show that there are a variety of different ways that technical information are presented and in general terms highlights how care needs to be taken when checking equivalent performance of CFRP Plate Bonding Products for use in flexural strengthening reinforced concrete structures.

 

CFRP Plates - Flexural Modulus Comparision
CFRP Plates – Flexural Modulus Comparision

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.

What can be achieved by strengthening structures using CFRP plate bonding?

Structural strengthening using carbon fibre plates bonded to reinforced concrete can;

  • Increased flexural strength
  • Redistribute loads around openings
  • Improve shear/punching shear resistance
  • Increase impact resistance
  • Increase load carrying capacity of structure

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.