A new testing method for textile reinforced concrete under impact load

Abstract

Textile reinforced concrete, especially textile reinforced concrete with carbon fibres, was already been used for strengthening steel reinforced concrete structures under static loads up to now. The question is if the composite can also be used for strengthening structures against impact loads. The main goal of a current research project at the Technische Universität Dresden is the development and characterization of a reinforcement fabric with optimized impact resistance. But there is a challenge. There is the need to find the best combination of fibre material (glass, carbon, steel, basalt, …) and reinforcement structure (short fibres, 2D-fabrics, 3D-fabrics, …), but testing the large number of possible combinations is not possible with the established methods. In general, large-scale tests are necessary which are very expensive and time consuming. Therefore, a new testing method has been developed to deal with this large number of possible combinations of material and structural experiments. The following paper describes this new testing method to find the best fabric reinforcement for strengthening reinforced concrete structures against impact loads. The testing devise, which is located in the drop tower facility at the Otto Mohr Laboratory, and the test set-up are illustrated and described. The measurement equipment and the methods to evaluate the experimental results are explained in detail.

Mineral-bonded composites for enhanced structural impact safety - Overview of the format, goals and achievements of the research group GRK 2250

“…Although extensively studied at the material level [5,30,31,32] and in small-scale impact tests [20,33] the performance of SHCC and TRC as strengthening layers subject to highly dynamic loading conditions was not investigated as of yet. For getting an initial insight into the behavior of these materials as strengthening layers on the rear-side of impacted concrete elements, large-scale impact experiments have been performed involving well-studied SHCC and TRC compositions.…”

“…The goal of the projects A5 and A6 is to assess the performance of various strengthening concepts for the impacted and for the rear sides of structural elements, respectively. The experiments are carried out in an advanced drop tower facility [20][21][22]. Besides the quantitative and empirical evaluation of the performance of the concrete plates and strengthening layers, analytical and numerical simulations are performed for quantifying the inherent dynamic effects and deriving the material related parameters both of the RC plates and of the strengthening layers under high-speed impact loading.…”

“…The experiments were carried out in a drop tower facility, developed and assembled at the Institute of Concrete Structures of TU Dresden [20,21]. The drop tower can operate in a gravitational mode with a 2.5 tones drop weight, as well as by accelerating up to 100 kg heavy projectiles using air pressure [21,34].…”

Experimental investigation on reinforced concrete slabs strengthened with carbon textiles under repeated impact loads

“…The impact tests were carried out by using the drop tower facility of the Institute of Concrete Structures of TU Dresden (Figure 3). This test setup can be used in testing specimens by means of the free fall of either weights 21 or accelerated weights 22,23 . In this experimental study, accelerated weights were used.…”

Small‐scale plate tests with fine concrete in experiment and first simplified simulation

“…This experimental setup is located in the drop tower of the Otto Mohr Laboratory (Technische Universität Dresden, see Ref. 18). Until today, a large number of smallscale experiments were realized.…”