Coupling between leaching and creep of concrete

Torrenti, Jean‐Michel; Nguyen, Vu‐Hieu; Colina, Horacio; Maou, F Le; Benboudjema, Farid; Deleruyelle, F.

doi:10.1016/j.cemconres.2008.01.012

Cited by 42 publications

(24 citation statements)

References 15 publications

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“…This is because the deviatoric stress corresponding to 50% of the failure Compared with the creep tests performed on sound material, such result shows that there is a strong coupling between creep deformation and chemical degradation. Similar observations have been reported for a construction concrete sample, cured and tested at ambient temperature under uniaxial condition (Torrenti et al 2008). However, the strains evolve much slower during their test.…”

Section: Test With 3 Mpa Confining Pressuresupporting

confidence: 67%

“…On the other hand, by comparison with short-term investigations, few studies have focused on chemical degradation effects on long-term behaviors (Bernard et al 2003;Torrenti et al 2008;Xie et al 2008). These studies, always carried out at ambient temperature, have underlined important effects of chemical leaching on uncoupled (Bernard et al 2003) and coupled (Torrenti et al 2008;Xie et al 2008) creep deformation. The tests on chemically degraded material reveal the existence of a short-term creep as well as a long-term creep (Bernard et al 2003).…”

Section: Introductionmentioning

confidence: 96%

See 1 more Smart Citation

Deformation and Permeability Evolution of Petroleum Cement Paste Subjected to Chemical Degradation Under Temperature

Yurtdas¹,

Xie²,

Burlion³

et al. 2010

Transp Porous Med

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The variation of permeability of typical petroleum cement paste is investigated as functions of mechanical loading and chemical degradation under the temperature of 90 • C. In sound material, the permeability classically increases with deviatoric stress due to microcracks and volumetric dilatancy but decreases with confining pressure. Chemical leaching leads to significant increase of porosity of cement paste. However, the permeability of degraded material is lower than that of sound material during triaxial compression tests; this is due to compaction of pores under confining pressure. Further, the permeability variation in degraded cement is much more sensitive to confining pressure than that of sound material. During triaxial creep test, the permeability of degraded material decreases with time while that of sound material increases; this shows that the chemically leached material has a higher potential of volumetric compaction which is a key mechanism of plastic deformation. Coupled chemical degradation and triaxial compression tests are also performed. Under low confining pressure (3 MPa), the permeability increases with propagation of leaching front, and there is formation of preferential flow paths in the axial direction. However, with high confining pressure (10 MPa), there is no increase of permeability during chemical leaching and creation of successive degraded layers in the flow direction.

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Section: Test With 3 Mpa Confining Pressuresupporting

confidence: 67%

Section: Introductionmentioning

confidence: 96%

Deformation and Permeability Evolution of Petroleum Cement Paste Subjected to Chemical Degradation Under Temperature

Yurtdas¹,

Xie²,

Burlion³

et al. 2010

Transp Porous Med

View full text Add to dashboard Cite

show abstract

“…A calibration curve for SiO 2 can be constructed since the peak area of the DTA curve is dependent on the sample mass [39], assuming that quartz is inert during the decalcification process [40,41] and remains constant before and after degradation, Several DTA analyses were made with increasing quantities of the same sand used to fabricate the samples, and a calibrate curve was obtained. Therefore relative contents (S i expressed in terms of percent of compound in the cementitious matrix) of both portlandite and calcite could be used using the following equation:…”

Section: Cementitious Matrix Characterisationmentioning

confidence: 99%

Decalcification of cement mortars: Characterisation and modelling

Segura

Molero²,

Aparicio³

et al. 2013

Cement and Concrete Composites

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a b s t r a c tThis paper presents the results of a thorough microstructural characterisation of a set of cement mortars (made with three w/b ratios and five different cement types), degraded by the ammonium nitrate method. Both destructive and ultrasonic non-destructive techniques were used to characterise the samples. The initial calcium content of the samples plays a dominant role in both the advance of the degradation process and the degradation grade of the samples. In addition, the decalcification process kinetics and the degradation grade are modelled, using Fick's second law of diffusion and the shrinking unreacted-core model. Two parametric equations are presented and used to estimate the decalcification process kinetics and the degradation grade using accessible microstructural parameters of the native mortars, such as the initial CaO content, the open porosity, and the cementitious matrix volume fraction. Furthermore, the degraded depth in the samples is measured using ultrasonic testing with an average error of about 10%.

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“…Leaching beahviour of the wasteform provides data for performance assessment of a repository. Note however that leach rates might significantly evolve especially due to degradation processes and in case of environmental conditions change [24,25].…”

Section: Introductionmentioning

confidence: 99%

Long-term field and laboratory leaching tests of cemented radioactive wastes

Ojovan

Varlackova²,

Golubeva³

et al. 2011

Journal of Hazardous Materials

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Experiments with real and simulated radioactive cementitious wasteforms were set up to compare the leaching behaviour of cementitious wasteforms containing nuclear power plant operational waste in field and laboratory test conditions. Experiments revealed that the average annual 137 Cs leach rate in deionised water was about thirty-five times greater compared with the measured average value for the 1 st year of the field test. Cumulative leached fraction of 137 Cs for 1 st year (3.74%) was close to values reported in literature for similar laboratory experiments in deionized water, however more than two orders of magnitude higher than the 1 st year leached fraction of 137 Cs in the repository test (0.01%). Therefore, to compare field and laboratory test results, a scaling factor is required in order to account for surface to volume factor difference, multiplied by a temperature factor and a leach rate decrease coefficient related to the ground water composition.

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Coupling between leaching and creep of concrete

Cited by 42 publications

References 15 publications

Deformation and Permeability Evolution of Petroleum Cement Paste Subjected to Chemical Degradation Under Temperature

Deformation and Permeability Evolution of Petroleum Cement Paste Subjected to Chemical Degradation Under Temperature

Decalcification of cement mortars: Characterisation and modelling

Long-term field and laboratory leaching tests of cemented radioactive wastes

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