When CRC products were first introduced to the market, the main market requirement with regard to documentation concerned structural performance, fire resistance, and durability. This was no problem, based on the extensive tests mentioned earlier. As CRC included conventional rebars, the design of the CRC elements was similar in principle to Eurocode design – just with some different values.
Another focus in Scandinavia was that balconies had to be well insulated and cold bridges avoided. This is something that was prioritized and that has further improved over the years. When the first CRC elements were installed, there were few guidelines for UHPC available, and while this has certainly changed over the last few years, there are still no harmonized standards for UHPC.
A CEN Task Group has just started to work on putting together a proposal for a Eurocode for UHPC, but it will take several years before a document is ready and approved. In Europe all building products should have a CE-marking (a declaration that your product meets certain standards), but UHPC products have been exempt from this requirement, as there is no harmonized standard that you can certify against. There is, however, another way to achieve the CE-marking – by using an ETA (European Technical Assessment). You can do this if there is no harmonized standard that covers your product and the ETA has to be approved by the European Commission as well as institutes from all the member countries.
Hi-Con produced a special ETA for balconies in UHPC. This was approved in 2017 and now works as a European standard that can also be used by other UHPC producers – and we can CE-mark against this standard. This has really reduced the need for additional documentation when we supply balconies in other countries.