A Novel Drop Weight Impact Setup for Testing Reinforced Concrete Beams

Soleimani, Sayed Mohamad; Banthia, Nemkumar

doi:10.1111/j.1747-1567.2012.00810.x

Cited by 55 publications

(32 citation statements)

References 7 publications

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“…Several authors used to modify Charpy impact test [24] to study impact behavior of concrete in bending. In the recent year assessment of impactbending property of concrete through drop hammer test based on the principle of weight falling down on the sample from specified falling weight has been reported [25][26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

A Statistical Study to Investigate the Efficiency of Steel and Polypropylene Fiber in Enhancing the Durability Properties of Concrete Composites

Singh

Rai

2018

CivileJournal

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Concrete deterioration is associated with factors like surface abrasion and transport of water through capillary action in the concrete matrix. These factors may catalyse other forms of deformation such as cracking and corrosion of reinforcing steel. This paper presents an experimental evaluation to compare the effectiveness of steel and polypropylene fiber in enhancing the mechanical and durability properties, in terms of impact, sorptivity, and abrasion. In the present study, abrasion resistance is strongly related to flexural strength as high correlation coefficient existed as compared to that of compressive strength and split tensile strength. Sorptivity test results demonstrated a substantial decrease in capillary porosity when PPF is used in concrete. The average initial sorptivity versus fiber volume fraction represents a linear relationship with high R 2 value. Positive correlations were also detected between abrasion and initial sorptivity of ordinary Portland cement concrete composite with polypropylene fiber.

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Section: Introductionmentioning

confidence: 99%

A Statistical Study to Investigate the Efficiency of Steel and Polypropylene Fiber in Enhancing the Durability Properties of Concrete Composites

Singh

Rai

2018

CivileJournal

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“…The modified Charpy test is limited by size of the sample and weight of the impact pendulum. Another way how to assess impact-bending properties of concrete are methods based on a principle of weight falling down on the sample from specified height, so called drop tower tests [2][3][4]. The disadvantage of these methods is the fact that a so called double hit caused by rebound of the impactor can occur in case when the specimen is not fully broken by the first blow of the impactor.…”

Section: Introductionmentioning

confidence: 99%

Design of a novel horizontal impact machine for testing of concrete specimens

Máca

Zatloukal

Sovják

2014

WIT Transactions on the Built Environment

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A novel design approach of an impact testing apparatus for concrete and highperformance cementitious composite specimens is described in this paper. To date, various approaches have been adopted when measuring the behaviour of concrete under impact loading. Most of the research teams used machines based on a guided drop-weight falling down freely on a concrete specimen. This paper describes the development process of a novel machine that is based on the pendulum principle. This experimental setup allows a horizontal placement of a specimen which has several advantages, such as easy elimination of a so called double hit, easy access to the sample and free space for the sensor mounting. The machine in the current setup is used for testing beam specimens, but, due to its modular concept it is also possible to rearrange the setup to test slabs utilizing a proprietary load transformer. The preliminary experimental results are shown in this paper as well as a description of the data acquisition system and adopted method of data filtration.

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“…The impact force between the hammer tup and the beam is measured by a piezoelectric force sensor affixed to the tup. Due to the fact that the impact load measured includes inertia force, thus, two more force sensors are located between the supporter and the specimen for measuring pure bending load (reaction force) excluding inertia effect [14][15][16][17]. An accelerometer bonded to the hammer is used to measure acceleration during the impact process, and then loading point displacement would be determined [3].…”

Section: Impact Tests At Loading Rate 10 3 Mm/smentioning

confidence: 99%

“…Under dynamic loading conditions, 0 was obtained by the area under the reaction forcedisplacement (load -displacement) curves, where the reaction force is evaluated by adding the values from both support data points as proposed in references [14][15][16][17].…”

Section: Impact Tests At Loading Rate 10 3 Mm/smentioning

confidence: 99%

Loading Rate Effect on the Fracture Behaviour of Three Different Steel Fibre-Reinforced Concretes

Zhang¹,

Ruiz²,

Tarifa³

et al. 2016

Proceedings of the 9th International Conference on Fracture Mechanics of Concrete and Concrete Structures

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Three-point bending tests on notched beams of three types of steel fiber-reinforced concretes (SFRC) have been conducted using both a servo-hydraulic machine and a drop-weight impact instrument. These three different concretes had the same matrix, while various fiber contents and deflection (displacement) hardening or softening behaviours, i. , respectively. The shape and geometry of the specimen followed the RILEM recommendation but with a reducing factor 1.5. The flexural strength and the fracture energy were measured over a wide range of loading rates (displacement rates), spanning six orders of magnitude, from 2.20 ×10 -3 mm/s (Quasistatic) to 2.66 ×10 3 mm/s. The results show that the fracture energy and the flexural strength increase as the loading rate increases for these three concretes. Besides, such a trend is relatively mild under low rates. The gain of the flexural strength is around 30% compared with its quasi-static values. For Concretes PA and PB, the enhancement of fracture energy is around 20%, but 30% for Concrete PC. However, under high rates the increase in the fracture energy and the peak load are pronounced. For Concrete PA, the dynamic increase factors of the flexural strength and the fracture energy are approximately 6 and 3, while for Concrete PC, they are around 4 and 2 respectively. That is, the higher the fiber content is, the less rate sensitivity gets.

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A Novel Drop Weight Impact Setup for Testing Reinforced Concrete Beams

Cited by 55 publications

References 7 publications

A Statistical Study to Investigate the Efficiency of Steel and Polypropylene Fiber in Enhancing the Durability Properties of Concrete Composites

A Statistical Study to Investigate the Efficiency of Steel and Polypropylene Fiber in Enhancing the Durability Properties of Concrete Composites

Design of a novel horizontal impact machine for testing of concrete specimens

Loading Rate Effect on the Fracture Behaviour of Three Different Steel Fibre-Reinforced Concretes

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