Handcrafted Headed Studs Postinstalled in Steel Fiber Concrete

What is it about?

This study proposes a practical solution for installing anchoring elements on hard or old concrete surfaces to receive tensile forces. For this situation, where the anchorages will be postinstalled, there is often no depth in the concrete base that meets the minimum straight length of standard anchoring. Thus, the use of headed studs or hooked anchor bolts are the most recommended solutions, but the procedure for installing these elements is still the subject of experimental investigations. Then, the technique of postinstallation of headed studs in hardened concrete niches and the use of structural epoxy resin in the new-old concrete interface is presented. Additionally, the influence of the addition of steel fiber on the anchorage studs performance was also evaluated.

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Photo by Brendan Church on Unsplash

Photo by Brendan Church on Unsplash

Why is it important?

This study presented the experimental results of pull-out tests of handcrafted headed studs embedded in steel fiber–reinforced concrete and with or without epoxy adhesive in the interface between old and new concrete. The presence of epoxy adhesive, with or without steel fiber, improved the bond strength and increased the failure load, changing the failure surface from cylindrical to conical and making this methodology an alternative to structural reinforcements as in the postinstalled anchorage applications of premolded mixture structures in assembly.