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

Curosu, Iurie

doi:10.21012/fc10.235408

Cited by 15 publications

(22 citation statements)

References 23 publications

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“… Behavior of an unprotected RC component ( left ) and of a strengthened concrete element ( right ) under impact; original graphic: by M. Butler (see Curosu et al [ 14 ]), modified by M. Hering. …”

Section: Figurementioning

confidence: 99%

“…In a research project, conducted in the frame of the Research Training Group GRK 2250 “Mineral-bonded composites for enhanced structural impact safety”, a further aspect has now been added to the description of damage of impacted RC structures. Within this project A5 “Strengthening of plane RC elements against impact on the impact-far side” the principle of a subsequent strengthening of RC structures by thin reinforcement layers to increase their resistance against impact loading was investigated, [ 14 ]. For strengthening, the focus was on mineral-bonded composites.…”

Section: Introductionmentioning

confidence: 99%

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Reinforced Concrete Plates under Impact Load—Damage Quantification

Hering¹,

Bracklow²,

Scheerer³

et al. 2020

Materials

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A large number of impact experiments have been carried out at the Technische Universität Dresden in recent years in several research projects. The focus was on reinforced concrete plates on the one hand and on subsequently strengthened reinforced concrete plates on the other hand. Based on these investigations, two fundamental tasks arose: (1) finding an objective description of the damage of components made of steel reinforced concrete that had previously been subjected to an impact load and (2) quantification of the effect of a subsequently applied strengthening layer. In this paper we will focus on both. At first, the experimental conditions and program as well as the used drop tower facility at the Otto Mohr Laboratory of the Technische Universität Dresden are briefly explained. In the summary presentation of the main test results, the focus is on the observed component damage. Based on the observations, an approach for a damage description is presented. To define global damage, the stiffness of the investigated structural components before and after the impact event is used. At the end of the paper, the potential of the method, but also gaps in knowledge and research needs are discussed.

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Section: Figurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Reinforced Concrete Plates under Impact Load—Damage Quantification

Hering¹,

Bracklow²,

Scheerer³

et al. 2020

Materials

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“…This strain-hardening behavior is accompanied by the extensive formation of multiple fine cracks perpendicular to the loading direction [ 4 , 5 ]. With its high energy absorption capacity, such a material can be used in strengthening existing structural elements against extreme loading conditions, e.g., impact and blast loading [ 6 ].…”

Section: Introductionmentioning

confidence: 99%

An Experimental Investigation of the Behavior of Strain-Hardening Cement-Based Composites (SHCC) under Impact Compression and Shear Loading

et al. 2020

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The ductile behavior of strain-hardening cement-based composites (SHCC) under direct tensile load makes them promising solutions in applications where high energy dissipation is needed, such as in earthquakes, impacts by projectiles, or blasts. However, the superior tensile ductility of SHCC due to multiple cracking does not necessarily point to compressive and shear ductility. As an effort to characterize the behavior of SHCC under impact compressive and shear loading relevant to the aforementioned high-speed loading scenarios, the paper at hand studies the performance of a particular SHCC and its constituent, cement-based matrices using the split-Hopkinson bar method. For compression experiments, cylindrical specimens with a length-to-diameter ratio (l/d) of 1.6 were used. The selected length of the sample led to similar failure modes under quasi-static and impact loading conditions, necessary to a reliable comparison of the observed compressive strengths. The impact experiments were performed in a split-Hopkinson pressure bar (SHPB) at a strain rate that reached 110 s−1 at the moment of failure. For shear experiments, a special adapter was developed for a split-Hopkinson tension bar (SHTB). The adapter enabled impact shear experiments to be performed on planar specimens using the tensile wave generated in the SHTB. Results showed dynamic increase factors (DIF) of 2.3 and 2.0 for compressive and shear strength of SHCC, respectively. As compared to the non-reinforced constituent matrix, the absolute value of the compressive strength was lower for the SHCC. Contrarily, under shear loading, the SHCC demonstrated higher shear strength than the non-reinforced matrix.

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“…This strain-hardening behavior is accompanied by the extensive formation of multiple fine cracks perpendicular to the loading direction [4,5]. With its high energy absorption capacity, such a material can be used in strengthening existing structural elements against extreme loading conditions, e.g., impact and blast loading [6].…”

Section: Introductionmentioning

confidence: 99%

An Experimental Investigation on the Behavior of Strain Hardening Cement-Based Composites (SHCC) under Impact Compression and Shear Loading

Heravi¹,

Mosig²,

Tawfik³

et al. 2020

Preprint

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The ductile behavior of strain hardening cement-based composites (SHCC) under direct tensile load makes them promising solutions for applications where high energy dissipation is needed, such as earthquake, impact by a projectile, or blast. However, the superior tensile ductility of SHCC due to multiple cracking does not necessarily entail compressive and shear ductility. As an effort to characterize the behavior of SHCC under impact compressive and shear loading, relevant to the mentioned high-speed loading scenarios, the paper at hand studies the performance of a SHCC and its constituent cement-based matrices using the split-Hopkinson bar method. For compression experiments, cylindrical specimens with a length-to-diameter ratio (l/d) of 1.6 were used. The selected length of the sample led to similar failure modes under the quasi-static and impact loading conditions, which was necessary for a reliable comparison of the obtained compressive strengths. The impact experiments were performed in a split-Hopkinson pressure bar (SHPB) at a strain rate that reached 110 s-1 at the moment of failure. For shear experiments, a special adapter was developed for a split-Hopkinson tension bar (SHTB). The adapter enabled performing impact shear experiments on planar specimens using the tensile wave generated in the SHTB. Results showed a dynamic increase factor (DIF) of 2.3 and 2.0 for compressive and shear strength of SHCC, respectively. As compared to the non-reinforced constituent matrix, the absolute value of the compressive strength was lower for the SHCC. Contrarily, under shear loading, the SHCC yielded the higher shear strength than the non-reinforced matrix.

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

Cited by 15 publications

References 23 publications

Reinforced Concrete Plates under Impact Load—Damage Quantification

Reinforced Concrete Plates under Impact Load—Damage Quantification

An Experimental Investigation of the Behavior of Strain-Hardening Cement-Based Composites (SHCC) under Impact Compression and Shear Loading

An Experimental Investigation on the Behavior of Strain Hardening Cement-Based Composites (SHCC) under Impact Compression and Shear Loading

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