Investigating the impact resistance of ultra-high-performance fiber-reinforced concrete using an improved strain energy impact test machine

Park, Seung Hun; Kim, Dong-Joo; Kim, Sung Wook

doi:10.1016/j.conbuildmat.2016.08.027

Cited by 98 publications

(20 citation statements)

References 13 publications

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“…The trend is different from what many authors have reported for UHPFRC in the dynamic domain [23,24,31,32,35,36], wherein an increase in ε Utu is reported with an increase in the strain rate of loading. The increase in ε Utu was attributed mainly to the increase in the number of cracks within the gauge length as the strain rate increased [23,31]. However, [33] reported a decrease in the ε Utu with an increase in the strain rate, similar to the findings in the present study.…”

Section: Strain At Tensile Strengthcontrasting

confidence: 99%

“…A third trend was shown by Mix I at 5°C and Mix II at on the strain rate is reported with the tensile strength increasing with increase in the strain rate. On the other hand, as noted in [23,35], the increase in the DIF is quite steep in the dynamic domain (> 1/s), whereas it was much milder in the quasi-static domain. However, the lack of test data for strain rates lower than 1 × 10 −6 s −1 for UHPFRC Fig.…”

Section: Elastic Modulusmentioning

confidence: 57%

“…Cement and Concrete Research 133 (2020) 106067 [20]. As such, majority of the studies on the effect of strain rate on the tensile mechanical properties of UHPFRC are concentrated to the dynamic domain (1 × 10 −4 s −1 to 1 × 10 2 s −1 ) [20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36]. All of these works discuss the strain rate effect using the direct tension test except [21,30] who had conducted flexural bending tests and [27][28][29] who had used splitting tension tests to study the strain rate effects in the dynamic domain.…”

Section: Ma Hafiz and E Denariémentioning

confidence: 99%

“…If however, at very slow loading rates, the pullout of the single straight smooth fibers in the present study shows a strain rate sensitivity, it could be argued that the factor λ, including the effect of grouping of fibers or fiber orientation, counters the fiber pullout strain rate sensitivity, thereby making the overall composite action, strain rate insensitive. The results in [23,71] indicated a higher rate sensitivity of fiber pullout for mixes with lower fiber volume fraction, and the authors attributed this behavior to the group effect, wherein, the strain rate sensitivity is eliminated when a group of fibers interact together during pullout. The same effect may be present for the mixes in the present study as the fiber volume dosage is 9%.…”

Section: Tensile Strengthmentioning

confidence: 99%

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Tensile response of UHPFRC under very low strain rates and low temperatures

Hafiz

Denarié

2020

Cement and Concrete Research

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This paper addresses the uniaxial tensile response of Strain Hardening Ultra High-Performance Fiber Reinforced Concretes (SH-UHPFRC) subjected to very low strain rates and low temperatures. The influence of four different strain rates; 1 × 10 −5 , 1 × 10 −7 , 1 × 10 −8 and 5 × 10 −9 1/s on the tensile properties like elastic limit, elastic modulus, tensile strength and the strain at tensile strength, was studied for two types of SH-UHPFRC mixes; Mix I with type I cement and silica fume, and Mix II with silica fume and 50% mass replacement of type I cement with limestone filler, at three curing temperatures; 20°C, 10°C and 5°C. The tests at strain rates lesser than 1 × 10 −6 1/s are the first of their kind for UHPFRC materials and the results show a considerable impact on the elastic limit of the mixes. Acoustic Emission tests were also carried out for validation of test results of the elastic limit.

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Section: Strain At Tensile Strengthcontrasting

confidence: 99%

Section: Elastic Modulusmentioning

confidence: 57%

Section: Ma Hafiz and E Denariémentioning

confidence: 99%

Section: Tensile Strengthmentioning

confidence: 99%

See 2 more Smart Citations

Tensile response of UHPFRC under very low strain rates and low temperatures

Hafiz

Denarié

2020

Cement and Concrete Research

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“…It can be seen from Table 7 and Figure 12 that the fitting results of PFR-UHSC are much closer to CEB-FIP 21 formula than the counterparts of SFR-UHSC, indicating a more brittle behavior of PFR-UHSC. 31 In fact, with a 1.0% fiber amount, DIFs for the compressive strength of PFR-UHSC at strain rates larger than 60 s −1 are approximately 26.3% higher than those of SFR-UHSC. Noting that the fitting results for PFR-UHSC with different PVA fiber dosages are quite similar, a unified equation without considering fiber amount was proposed as.…”

Section: Dynamic Compressive Strengthmentioning

confidence: 93%

Static and dynamic mechanical properties of eco‐friendly polyvinyl alcohol fiber‐reinforced ultra‐high‐strength concrete

Zhang

Jin

YiShui

et al. 2019

Structural Concrete

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An eco‐friendly polyvinyl alcohol (PVA) fiber‐reinforced ultra‐high‐strength concrete (PFR‐UHSC) was designed and mixed to evaluate its static and dynamic mechanical properties in this study. A lower water‐to‐binder ratio of 0.22 and a superplasticizer were used to guarantee the performance of PFR‐UHSC, while several industrial by‐products were involved to reduce the negative environmental impact of concrete. Four volume fraction of PVA fibers (Vf = 0, 0.5, 1.0, and 1.5%) were included in the experiment and steel fiber‐reinforced ultra‐high‐strength concrete (SFR‐UHSC) with Vf = 1.0% was also tested as a comparison. Experiment results show that although less ductile than SFR‐UHSC, PFR‐UHSC exhibits relatively good ductility, toughness, and deformability under static loadings. Namely, splitting tensile and flexural strengths as well as flexural toughness of PFR‐UHSC are significantly improved by the incorporation of PVA fibers while no obvious variation is viewed for Young's modulus. And even, the compressive strength of PFR‐UHSC decreases slightly with the increasing PVA fiber dosage. When subjected to dynamic loadings with lower strain rates, PFR‐UHSC displays a better performance than SFR‐UHSC in terms of failure patterns, while a reverse behavior is observed for high strain rate. Affected by introduction of PVA fiber, the enhancement of strain rate for compressive strength of PFR‐UHSC is lower than that for ordinary concrete but higher than that for SFR‐UHSC. Besides, although having a slightly lower compressive toughness, the energy absorption capacity of PFR‐UHSC is similar to that of SFR‐UHSC.

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Noncontact stress measurement from bare UHPC surface using Raman piezospectroscopy

Yun

Eslami

Zhou

2018

J Raman Spectroscopy

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Raman piezospectroscopy was applied for noncontact stress measurement from bare ultrahigh‐performance concrete (UHPC). Microstructure and chemical characterization were conducted for 3 phases of UHPC samples, including unmixed concrete ingredients (Sample 1), cured concrete (Sample 2), and pulverized concrete (Sample 3). Rich contents of polycrystalline silica (quartz) were observed from all samples. The global and local piezospectroscopy coefficients were measured from compressive loading frame tests at 3.77 cm−1/GPa and 1.62–9.10 cm−1/GPa, respectively. The quartz fingerprint peak was observed at 460.50 cm−1 from stress‐free UHPC powder, which can be used as the zero‐stress state to determine absolute stress in existing concrete structures. The global absolute stress equation is presented using the global piezospectroscopy coefficient and the zero‐stress state.

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Investigating the impact resistance of ultra-high-performance fiber-reinforced concrete using an improved strain energy impact test machine

Cited by 98 publications

References 13 publications

Tensile response of UHPFRC under very low strain rates and low temperatures

Tensile response of UHPFRC under very low strain rates and low temperatures

Static and dynamic mechanical properties of eco‐friendly polyvinyl alcohol fiber‐reinforced ultra‐high‐strength concrete

Noncontact stress measurement from bare UHPC surface using Raman piezospectroscopy

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