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

Abstract

This study presents the performance of carbon textile reinforcement used as strengthening layers for reinforced concrete (RC) slabs under repeated impact loads. In order to reveal the contribution of carbon textile reinforcement to the behavior of RC slabs under impacts, five identical RC slabs with the dimensions of 1.5 m × 1.5 m × 0.20 m were manufactured and tested at the Technische Universität Dresden. To understand failure mechanisms of RC slabs under impact loadings, two specimens were kept unstrengthened and tested under different impact velocities. The rest of the specimens was strengthened with three different carbon textile reinforcements embedded in an additional 2 cm fine‐grained concrete layer and subjected to impact loads with the same striker velocity. The results observed from the tests revealed that the carbon textile reinforcement is very effective at increasing the impact capacities of the specimens. Additionally, displacement–time histories and crack profiles are highly affected due to the carbon textile reinforcement types and ratios during the impact loadings.

Failure Modes Behavior of Different Strengthening Types of RC Slabs Subjected to Low-Velocity Impact Loading: A Review

“…Slab failure behavior is influenced by inertia and stress forces [67]. Typically, the thickness of the slab is thinner and considered more vulnerable to impact loading due to flexural or punching shear failures [41,42,44,53,57,67,77]. Miyamoto et al [45] proposed slab failure under the impact load, demonstrating that slab failure behavior under increasing impact loads changes from the flexural punching shear failure.…”

“…However, slab failure behavior is influenced by inertia and stress forces. Typically, the thickness of the slab is thinner and considered more vulnerable to impact loading; as a result, flexural or punching shear failures could occur [41][42][43][44]. Miyamoto et al [45] proposed slab failure under impact load, as shown in Figure 2.…”

“…Slabs with a higher steel ratio had less punching failure behavior [59] and protected the concrete slab from scabbing failure mode. Figure 6 shows three RC The RC slab failure mode depended on the reinforcement ratio and height of the impactor load; by increasing mass and height, there was a higher tendency for local failure in the RC slab [44][45][46]49,[55][56][57]. At high loading rates, flexural behavior was scarcely visible [51].…”

“…In other words, the peak impact load increased by 500% when the impact velocity changed from 1.98 to 13.28. The impact velocity was among the significant contributing parameters that damaged the RC structures/slab behavior under impact load; by increasing the impact velocity, the impact damage increased [14,19,25,30,41,42,[44][45][46][47][48][49][50][51]55,57,63,[69][70][71][74][75][76][77][78][79][80][81][82][83][84]. In conjunction with the impactor velocity, the impact mass has been studied in the literature and it has been revealed that, when the impactor weight increased, the failure or damage in the RC structure grew.…”

Carbonbeton‐Sandwichelemente unter Anpralllast – numerische und experimentelle Untersuchung

“…Um die Schutzwirkung der carbonbewehrten Verstärkungsschicht quantifizieren zu können, wurde das Verhalten der Verstärkungsschicht isoliert untersucht [11] und ein Durchbruchgrenzwert in Bezug auf die Anprallgeschwindigkeit ermittelt. In [12] wurde gezeigt, dass Carbonbetonverstärkungsschichten den Widerstand von Stahlbetonplatten gegenüber wiederholtem Impakt erhöhen. Eine weiterführende Forschung zur Erhöhung des Impaktwiderstands mit verschiedenen mineralisch gebundenen Hochleistungsverbundwerkstoffen erfolgte in [13].…”