Experimental study of strain rate effects on normal weight concrete after exposure to elevated temperature

Zhai, Chaochen; Chen, Li; Fang, Qin; Chen, Wensu; Jiang, Xiquan

doi:10.1617/s11527-016-0879-4

Cited by 51 publications

(15 citation statements)

References 14 publications

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“…Few research works are available in the literature about the evaluation of the concrete impact strength after high temperature exposure, most of which investigate high-strain rate impact tests and blast tests [27][28][29][30][31], while a very limited number of works were found on low-velocity impact tests on reinforced concrete members [18,32]. Most of these works developed numerical analyses to evaluate the dual effect of high temperature and high-strain rate impacts on reinforced concrete and composite structural members [33][34][35].…”

Section: Introductionmentioning

confidence: 99%

Residual Repeated Impact Strength of Concrete Exposed to Elevated Temperatures

et al. 2021

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Portland cement concrete is known to have good fire resistance; however, its strength would be degraded after exposure to the temperatures of fire. Repeated low-velocity impacts are a type of probable accidental load in many types of structures. Although there is a rich body of literature on the residual mechanical properties of concrete after high temperature exposure, the residual repeated impact performance of concrete has still not been well explored. For this purpose, an experimental study was conducted in this work to evaluate the effect of high temperatures on the repeated impact strength of normal strength concrete. Seven identical concrete patches with six disc specimens each were cast and tested using the ACI 544-2R repeated impact setup at ambient temperature and after exposure to 100, 200, 300, 400, 500 and 500 °C. Similarly, six cubes and six prisms from each patch were used to evaluate the residual compressive and flexural strengths at the same conditions. Additionally, the scattering of the impact strength results was examined using three methods of the Weibull distribution, and the results are presented in terms of reliability. The test results show that the cracking and failure impact numbers of specimens heated to 100 °C reduced slightly by only 2.4 and 3.5%, respectively, while heating to higher temperatures deteriorated the impact resistance much faster than the compressive and flexural strengths. The percentage reduction in impact resistance at 600 °C was generally higher than 96%. It was also found that the deduction trend of the impact strength with temperature is more related to that of the flexural strength than the compressive strength. The test results also show that, within the limits of the adopted concrete type and conducted tests, the strength reduction after high temperature exposure is related to the percentage weight loss.

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Section: Introductionmentioning

confidence: 99%

Residual Repeated Impact Strength of Concrete Exposed to Elevated Temperatures

et al. 2021

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“…It leads to the fact that the concrete material is in danger of fire exposure and dynamic loads simultaneously. The previous studies mainly focused on determining the response of normal strength concrete (NSC) under the combined effect of temperature and strain rate at a curing age of 28 days using the SHPB machine [20][21][22][23][24][25]. 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.…”

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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“…Huo et al 9 experimentally studied the dynamic behaviors of normal‐strength concrete after exposure to elevated temperatures. Zhai et al 10 focused on the effects of strain rate on normal concrete after exposure to elevated temperature experimentally. Tan et al 11 studied the change regulations of appearance, mass, compressive strength and elastic module of foamed concrete at ambient temperature and after different high temperatures.…”

Section: Introductionmentioning

confidence: 99%

Effects of strain rate, temperature and freeze–thaw cycle on the mechanical properties of cement mortar composite specimen

Liu

Wei

2020

Structural Concrete

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The effects of the strain rate, water/cement ratio, temperature and number of freeze–thaw cycle on the ultimate compressive strength, peak strain and elastic modulus of cement mortar composite specimens were studied using uniaxial compression test. Test results show that: (a) The strength difference of cement mortar composite specimens is not significant when the axial loading direction is parallel to the interface of two components with different water/cement ratios under low strain rate loading. The strength of cement mortar composite specimens mainly depends on the one with lower strength, and the strength of cement mortar specimen with high strength is more sensitive to the strain rate than that of cement mortar specimen with low strength. (b) With the increase of temperature from 25°C (room temperature) to 500°C, the strength of the specimen with high compressive strength will increase first and then decrease. Nevertheless the strength of the specimen with low compressive strength will gradually decrease. The strength of cement mortar composite specimen will decrease with increased number of freeze–thaw cycle. (c) Under the same strain rate, after the same high temperature or the same number of freeze–thaw cycle, the peak strain of the composite specimens composed of two water/cement ratio components is much larger than that of the specimen composed of only one component; conversely, the elastic modulus shows an opposite trend.

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Experimental study of strain rate effects on normal weight concrete after exposure to elevated temperature

Cited by 51 publications

References 14 publications

Residual Repeated Impact Strength of Concrete Exposed to Elevated Temperatures

Residual Repeated Impact Strength of Concrete Exposed to Elevated Temperatures

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

Effects of strain rate, temperature and freeze–thaw cycle on the mechanical properties of cement mortar composite specimen

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