Innovative Materials and Techniques in Concrete Construction

مواد و تکنیک های نوآورانه در ساخت و ساز بتنی

Abstract “Non Finito” is a sculpting technique literally meaning that the work is unfinished. Non finito sculptures appear unfinished because the artist only sculpts part of the block, leaving the figure appearing to be stuck within the block of material. The idea of post-strengthening civil structures with carbon fiber reinforced polymer (CFRP) tapes was for the first time unveiled in an oral presentation at ETH Zurich in 1985. An appropriate feasibility study was published 2 years later. The reactions of the listening and reading audience were mixed. Most found the concept very crazy and absolutely not practicable. The method is meanwhile state-of-the-art. The goal of this paper is to discuss the very promising system of CFRP straps as active external reinforcement in present time and to list three examples of new “crazy” ideas which might be interesting for future R&D work and might show successful applications in 10, 20 or 30 years. (i) More and more lacy and very slender structural components of historic structures like in the matter of the dome of Milan are suffering cracking. Internal, post-tensioning along three-dimensional boreholes with thin CFRP wires could be powerful tool to close the cracks.

Abstract “Non Finito” is a sculpting technique literally meaning that the work is unfinished. Non finito sculptures appear unfinished because the artist only sculpts part of the block, leaving the figure appearing to be stuck within the block of material. The idea of post-strengthening civil structures with carbon fiber reinforced polymer (CFRP) tapes was for the first time unveiled in an oral presentation at ETH Zurich in 1985. An appropriate feasibility study was published 2 years later. The reactions of the listening and reading audience were mixed. Most found the concept very crazy and absolutely not practicable. The method is meanwhile state-of-the-art. The goal of this paper is to discuss the very promising system of CFRP straps as active external reinforcement in present time and to list three examples of new “crazy” ideas which might be interesting for future R&D work and might show successful applications in 10, 20 or 30 years. (i) More and more lacy and very slender structural components of historic structures like in the matter of the dome of Milan are suffering cracking. Internal, post-

مواد و تکنیک های نوآورانه در ساخت و ساز بتنی

tensioning along three-dimensional boreholes with thin CFRP wires could be powerful tool to close the cracks.

Abstract “Non Finito” is a sculpting technique literally meaning that the work is unfinished. Non finito sculptures appear unfinished because the artist only sculpts part of the block, leaving the figure appearing to be stuck within the block of material. The idea of post-strengthening civil structures with carbon fiber reinforced polymer (CFRP) tapes was for the first time unveiled in an oral presentation at ETH Zurich in 1985. An appropriate feasibility study was published 2 years later. The reactions of the listening and reading audience were mixed. Most found the concept very crazy and absolutely not practicable. The method is meanwhile state-of-the-art. The goal of this paper is to discuss the very promising system of CFRP straps as active external reinforcement in present time and to list three examples of new “crazy” ideas which might be interesting for future R&D work and might show successful applications in 10, 20 or 30 years. (i) More and more lacy and very slender structural components of historic structures like in the matter of the dome of Milan are suffering cracking. Internal, post-tensioning along three-dimensional boreholes with thin CFRP wires could be powerful tool to close the cracks.

مواد و تکنیک های نوآورانه در ساخت و ساز بتنی

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