Strain-rate effect on the tensile behaviour of concrete at different relative humidity levels

Cadoni, Ezio; Labibes, K.; Albertini, C.; Berra, M.; Giangrasso, Marco

doi:10.1007/bf02482196

Cited by 160 publications

(60 citation statements)

References 11 publications

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“…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: 96%

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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Section: Introductionmentioning

confidence: 96%

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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“…Brara et al [16] developed a spalling version of the SHPB for concrete to determine the tensile strength at high strain rates up to 120 1/s. Cadoni et al [17] used the Hopkinson Bar Bundle with 100 m-long strain energy storing steel cables for large concrete specimen with square cross section of 200 Â 200 mm 2 . The setup was devised to diminish the non-uniform distribution of axial stress across the large sized bars and achieved a strain rate of 10 1/s.…”

Section: High Strain Rate Testing Of Concrete In Tensionmentioning

confidence: 99%

Capturing the strain hardening and softening responses of cementitious composites subjected to impact loading

Pyo

El‐Tawil

2015

Construction and Building Materials

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“…Thus, the strain (rather than stress) vector on each microplane is the projection of the macroscopic strain tensor. So we have, 1) where N , M and L are the magnitudes of the three strain vectors corresponding to each microplane, and N ij = n i n j , M ij = (n i m j + m i n j )/2 and L ij = (n i l j + l i n j )/2, n, m, and l being the three mutually orthogonal normal and tangential unit vectors characterizing that microplane, and the subscripts i and j = 1,2,3. Secondly, a variational principle (principle of virtual work) relates the stresses on the microplanes (σ N , σ M and σ L ) to the macro-continuum stress tensor σ ij , to ensure equilibrium; it is expressed as…”

Section: Microplane Model M7 With Scaled Boundariesmentioning

confidence: 99%

Strain-rate-dependent microplane model for high-rate comminution of concrete under impact based on kinetic energy release theory

Kirane¹,

Bažant³

2015

Proc. R. Soc. A.

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The apparent increase of strength of concrete at very high strain rates experienced in projectile impact (10 s −1 to 10 6 s −1 ), called 'dynamic overstress', has recently been explained by the theory of release of local kinetic energy of shear strain rate in finite size particles about to form. This theory gives the particle size and the additional kinetic energy density that must be dissipated in finite-element codes. In previous research, it was dissipated by additional viscosity, in a model partly analogous to turbulence theory. Here it is dissipated by scaling up the material strength. Microplane model M7 is used and its stress-strain boundaries are scaled up by factors proportional to the −4/3rd power of the effective deviatoric strain rate and its time derivative. The crack band model with a random tetrahedral mesh is used and all the artificial damping is eliminated. The scaled M7 model is seen to predict the crater shapes and exit velocities of projectiles penetrating concrete walls of different thicknesses as closely as the previous models. The choice of the finite strain threshold for element deletion criterion, which can have a big effect, is also studied. It is proposed to use the highest threshold above which a further increase has a negligible effect.

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Strain-rate effect on the tensile behaviour of concrete at different relative humidity levels

Cited by 160 publications

References 11 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

Capturing the strain hardening and softening responses of cementitious composites subjected to impact loading

Strain-rate-dependent microplane model for high-rate comminution of concrete under impact based on kinetic energy release theory

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