The dynamic behaviour of concrete: influence of free water

Rossi, Pierre; Mier, J.G.M. van; Boulay, Claude; Maou, F Le

doi:10.1007/bf02472446

Cited by 137 publications

(54 citation statements)

References 2 publications

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“…In the moderate regime, the free water in the micro-pores is assumed to exhibit the so-called Stefan-effect causing loading rate (Rossi et al 1992).…”

Section: Effect Of Water Content On Dynamic Compressive Behaviourmentioning

confidence: 99%

“…However, there seems to be no consensus as to whether an increase or decrease occur in the dynamic behaviour as the water content is changed. Rossi et al (1992), Cadoni et al (2001), Yan & Lin (2006), Zhou (2007) have found that substantial strength increases for wet concrete in the regime with moderate strain rate, where dry concrete has been demonstrated to be relatively insensitive. Logunova et al (1994) achieved the same conclusion for compressive strength through tests.…”

Section: Introductionmentioning

confidence: 97%

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Influence of free water content on the compressive mechanical behaviour of cement mortar under high strain rate

Zhou

Chen

et al. 2011

Sadhana

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The effect of free water content upon the compressive mechanical behaviour of cement mortar under high loading rate was studied. The uniaxial rapid compressive loading testing of a total of 30 specimens, nominally 37 mm in diameter and 18.5 mm in height, with five different saturations (0%, 25%, 50%, 75% and 100%, respectively) were executed in this paper. The technique 'Split Hopkinson pressure bar' (SHPB) was used. The impact velocity was 10 m/s with the corresponding strain rate as 10 2 /s. Water-cement ratio of 0.5 was used. The compressive behaviour of the materials was measured in terms of the maximum stress, Young's modulus, critical strain at maximum stress and ultimate strain at failure. The data obtained from test indicates that the similarity exists in the shape of strain-stress curves of cement mortars with different water content, the upward section of the stress-strain curve shows bilinear characteristics, while the descending stage (softening state) is almost linear. The dynamic compressive strength of cement mortar increased with the decreasing of water content, the dynamic compressive strength of the saturated specimens was 23% lower than that of the totally dry specimens. With an increase in water content, the Young's modulus first increases and then decreases, the Young's modulus of the saturated specimens was 23% lower than that of the totally dry specimens. No significant changes occurred in the critical and ultimate strain value as the water content is changed.Keywords. Cement mortar; free water content; dynamic compressive mechanical behaviour; split Hopkinson pressure bar.

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“…In the moderate regime, the free water in the micro-pores is assumed to exhibit the so-called Stefan-effect causing loading rate (Rossi et al 1992).…”

Section: Effect Of Water Content On Dynamic Compressive Behaviourmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

Influence of free water content on the compressive mechanical behaviour of cement mortar under high strain rate

Zhou

Chen

et al. 2011

Sadhana

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“…Ross et al [4] and Rossi et al [5] studied the behaviors of concrete with static and dynamic experiments on wet and dry specimens and both observed that strain rate had an obvious influence on the wet concrete but only a slight influence on the dry concrete. Rossi et al [6] investigated the effect of water content on the rate sensitivity of concrete by carrying out Splitting Hopkin- Zielinski et al [7] experimented on wet and dry concrete and concluded that there was no definite change in dynamic strength when the moisture condition changed. Brara and Klepaczko [8] studied the coupled effects of moisture and strain rate on the strength of concrete and concluded that water content was not a main factor on strength.…”

Section: Introductionmentioning

confidence: 98%

Dynamic properties of concrete under severe environmental condition

Yan

Guo

2010

J. Wuhan Univ. Technol.-Mat. Sci. Edit.

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Exposure to environmental conditions can significantly influence the mechanical behavior of concrete structures in civil engineering. In this study, the effect of environmental factors, such as moisture and temperature, on the strain-rate sensitivity of concrete mixtures was systematically investigated. The strain rate varied from 10 -5 s -1 to 10 -2 s -1 . From the investigation it was concluded that moisture content had a significant influence on the strain-rate sensitivity of concrete. With regard to concrete with low moisture content, temperature had little influence on the rate-dependent behavior; while for fully saturated specimens, a significant influence was observed. These phenomena were attributed to the meso-scale bonding properties of the concrete matrix. Equations were derived to characterize the ultimate strength increment of concrete with strain rate under different environmental conditions. An explanation to the dynamic failure mechanisms of concrete based on the experimental findings was proposed.

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“…Consequently the influence of existing single defects and voids becomes less important, as the whole material volume works together to resist the applied load. Similarly, the theory of multi-activation of the fracture process at impact regime [7] or theories like limited crack propagation rate, pore water and multiple cracking [8][9][10] have also been proposed and provide explanations to the observed phenomena.…”

Section: Introductionmentioning

confidence: 99%

Compressive behaviour of dam concrete at higher strain rates

Caverzan

Peroni

Solomos

2016

Eur. Phys. J. Spec. Top.

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Abstract. The mechanical behaviour of concrete when subjected to impact or blast has still many aspects requiring further study. Dam concrete is characterized by large coarse aggregates, hence large specimen sizes are needed in order to study a representative volume of the material. Exploiting an innovative equipment, based on Hopkinson bar techniques, the dynamic behaviour of concrete of 64 mm maximum aggregate size has been investigated. Direct dynamic compression tests have been performed on medium and large size cylindrical samples. Full stress-strain curves have been obtained, which have allowed the estimation of fracturing energies and of the relevant dynamic increase factor. The experimental campaign has also included a reference standard concrete in order to highlight the peculiarity of the dam concrete at high strain rates and to validate the transition of this type of testing to very large specimens.

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The dynamic behaviour of concrete: influence of free water

Cited by 137 publications

References 2 publications

Influence of free water content on the compressive mechanical behaviour of cement mortar under high strain rate

Influence of free water content on the compressive mechanical behaviour of cement mortar under high strain rate

Dynamic properties of concrete under severe environmental condition

Compressive behaviour of dam concrete at higher strain rates

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