Combined effects of high temperature and high strain rate on normal weight concrete

Chen, Li; Fang, Qin; Jiang, Xiquan; Ruan, Zheng; Hong, Jung‐Wuk

doi:10.1016/j.ijimpeng.2015.07.002

Cited by 116 publications

(38 citation statements)

References 27 publications

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“…These studies concluded that the concrete strength reduced with temperature particularly above 400 • C and the dynamic increase factor (DIF) showed a linear relationship with strain rate. Chen et al [26] investigated the behaviour of NSC containing 15% to 20% of FA under high temperatures reaching up to 950 • C and strain rate range between 10 and 205 s −1 . The results showed a remarkable relation between the dynamic properties of concrete and strain rates at elevated temperature.…”

Section: Introductionmentioning

confidence: 99%

Late Age Dynamic Strength of High-Volume Fly Ash Concrete with Nano-Silica and Polypropylene Fibres

Mussa

Abdulhadi

Abbood³

et al. 2020

Crystals

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The dynamic behaviour of high-volume fly ash concrete with nano-silica (HVFANS) and polypropylene fibres at curing ages of 7 to 90 days was determined by using a split Hopkinson pressure bar (SHPB) machine. At each curing age, the concrete samples were laboratory tested at different temperatures conditions under strain rates reached up to 101.42 s−1. At room temperature, the results indicated that the dynamic compressive strength of plain concrete (PC) was slightly higher than HVFANS concrete at early curing ages of 7 and 28 days, however, a considerable improvement in the strength of HVFANS concrete was noted at a curing age of 90 days and recorded greater values than PC owing to the increase of fly ash reactivity. At elevated temperatures, the HVFANS concrete revealed a superior behaviour than PC even at early ages in terms of dynamic compressive strength, critical strain, damage and toughness due to increase of nano-silica (NS) activity during the heating process. Furthermore, equations were suggested to estimate the dynamic increase factor (DIF) of both concretes under the investigated factors.

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Section: Introductionmentioning

confidence: 99%

Late Age Dynamic Strength of High-Volume Fly Ash Concrete with Nano-Silica and Polypropylene Fibres

Mussa

Abdulhadi

Abbood³

et al. 2020

Crystals

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“…Temperatures are usually recorded by electric sensors such as thermocouples, which have been tested with satisfactory results (see e.g. [6][7][8]). However, as these sensors are electric, they cannot be used in places such as power plants, electrified railways or some biomedical applications, among others [6,9].…”

Section: Introductionmentioning

confidence: 99%

New fiber optic sensor for monitoring temperatures in concrete structures during fires

Górriz

Payá-Zaforteza

García

2017

Sensors and Actuators A: Physical

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This paper proposes a new fiber optic sensor based on Regenerated Fiber Bragg Gratings specially designed to be embedded in concrete structures to monitor temperatures during fire events. A practical test was carried out on a 5.8m long beam subjected to the ISO-834 fire curve for 77 minutes under the typical loads borne by beams in conventional structures. Nine optical sensors were installed at the mid-span section of the beam and were submitted directly to flames and high temperature gradients (of the order of 200ºC/min) that make them measure maximum temperatures of 953º C. The temperatures recorded by the new sensors were compared with those obtained from electrical sensors (thermocouples) and a numerical model, with which they showed a good fit, except in those places in which concrete spalling caused distortions in the results and/or failure of the sensors. The paper thus demonstrates the viability of optical technologies in monitoring reinforced concrete during fires and analyzes sensor behavior to point out areas in which additional research is required.

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“…The accidental fire usually induces explosion in the city environment surrounded with combustible materials, and vice versa [1]. It leads to the fact that the RC structures are in danger of combined effect of fire and blast.…”

Section: Introductionmentioning

confidence: 99%

“…The results revealed that the DIF (Dynamic Increase Factor) of fire-damaged concrete decreased with the ever-experienced high temperature. The dynamic properties of normal weight concrete at elevated temperature from 20°C up to 950°C were systematically studied using a specially manufactured microwave-heating automatic timecontrolled Split Hopkinson Pressure Bar (MATSHPB) by Chen et al [1]. It was reported that the failure phenomena and DIF of normal concrete under both high strain rate and high temperature were significantly different from those of concrete at ambient temperature.…”

Section: Introductionmentioning

confidence: 99%

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Experimental and numerical investigation into RC beams subjected to blast after exposure to fire

Zhai

Chen

Xiang

et al. 2016

International Journal of Impact Engineering

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Combined effects of high temperature and high strain rate on normal weight concrete

Cited by 116 publications

References 27 publications

Late Age Dynamic Strength of High-Volume Fly Ash Concrete with Nano-Silica and Polypropylene Fibres

Late Age Dynamic Strength of High-Volume Fly Ash Concrete with Nano-Silica and Polypropylene Fibres

New fiber optic sensor for monitoring temperatures in concrete structures during fires

Experimental and numerical investigation into RC beams subjected to blast after exposure to fire

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