Effect of calcium leaching on the pore structure, strength, and chloride penetration resistance in concrete specimens

Choi, Yoon Suk; Yang, Eun Ik

doi:10.1016/j.nucengdes.2013.02.049

Cited by 94 publications

(29 citation statements)

References 12 publications

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“…It should be noted that the presented results regarding the calcium depleted specimens are the minimum chloride migration coefficient due to the full penetration through the specimen thickness as it was pointed out previously. The results are in good agreement with the results presented Choi and Yang (2013).…”

Section: Transport Propertiessupporting

confidence: 92%

“…In their study they showed that the loss of strength due to complete removal of Portlandite can be up to 70 %. Similar results have also been presented by (Choi and Yang 2013). Moreover, rate of change in the strain of the concrete specimens as a function of applied stress representing stress-strain curves is presented in Fig.…”

Section: Mechanical Propertiessupporting

confidence: 85%

“…Heukamp et al (2001) used specimens with the size of Ø11.5 9 60 mm for a leaching period of 45 days. Nguyen et al (2007) have reported on the application of specimens of Ø32 9 100 mm and Ø110 9 220 for an experimental time of up to 547 days and Choi and Yang (2013), have used cylindrical concrete samples of Ø100 9 100 mm for an experimental time of up to 365 days. Further, the TGA analyses results are presented in Fig.…”

Section: Characterization Of Degraded Specimensmentioning

confidence: 99%

“…compressive strength and diffusivity, which require the use of larger samples. In addition it should be noted that there are not many studies reported in the literature with implication of concrete specimens (Choi and Yang 2013;Marinoni et al 2008;Nguyen et al 2007;Sellier et al 2011) of proper size but instead paste specimens or powder samples have been used (Adenot and Buil 1992;Carde et al 1996;Faucon et al 1996Faucon et al , 1998Haga et al 2005;Heukamp et al 2001;Maltais et al 2004;Revertegat et al 1992;Ryu et al 2002;Saito and Deguchi 2000;Ulm et al 2003;Wittmann 1997).…”

Section: Introductionmentioning

confidence: 99%

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Physical and Mechanical Properties of Cementitious Specimens Exposed to an Electrochemically Derived Accelerated Leaching of Calcium

Babaahmadi

Tang

Abbas

et al. 2015

International Journal of Concrete Structures and Materials

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Simulating natural leaching process for cementitious materials is essential to perform long-term safety assessments of repositories for nuclear waste. However, the current test methods in literature are time consuming, limited to crushed material and often produce small size samples which are not suitable for further testing. This paper presents the results from the study of the physical (gas permeability as well as chloride diffusion coefficient) and mechanical properties (tensile and compressive strength and elastic modulus) of solid cementitious specimens which have been depleted in calcium by the use of a newly developed method for accelerated calcium leaching of solid specimens of flexible size. The results show that up to 4 times increase in capillary water absorption, 10 times higher gas permeability and at least 3 times higher chloride diffusion rate, is expected due to complete leaching of the Portlandite. This coincides with a 70 % decrease in mechanical strength and more than 40 % decrease in elastic modulus.

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Section: Transport Propertiessupporting

confidence: 92%

Section: Mechanical Propertiessupporting

confidence: 85%

Section: Characterization Of Degraded Specimensmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Physical and Mechanical Properties of Cementitious Specimens Exposed to an Electrochemically Derived Accelerated Leaching of Calcium

Babaahmadi

Tang

Abbas

et al. 2015

International Journal of Concrete Structures and Materials

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“…Both frictional coefficient and cohesion are decreased while the leached material exhibits a more ductile behavior than the sound one (Figure ). Under high confining pressures, an acceleration of strain rate is clearly observed in leached material due to plastic pore collapse …”

Section: Introductionmentioning

confidence: 99%

A numerical study of mechanical behavior of a cement paste under mechanical loading and chemical leaching

Jia

Bian

Xie

et al. 2017

Num Anal Meth Geomechanics

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Summary Based on relevant experimental data of a petroleum cement paste under mechanical loading and chemical leaching, an elastic‐plastic model is first proposed by taking into account plastic shearing and pore collapse. The degradation of mechanical properties induced by the chemical leaching is characterized by a chemical damage variable which is defined as the increase of porosity. Both elastic and plastic properties of the cement paste are affected by the chemical damage. The proposed model is calibrated from and applied to describe mechanical responses in triaxial compression tests respectively on sound and fully leached samples. In the second part, a phenomenological chemical model is defined to establish the relationship between porosity change and calcium dissolution process. The dissolution kinetics is governed by a diffusion law taking into account the variation of diffusion coefficient with calcium concentration. The chemical model is coupled with the mechanical model, and both are applied to describe mechanical response of cement paste samples subjected to progressive chemical leaching and compressive stresses. Comparisons between experimental data and numerical results are presented.

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Leaching Led Deterioration of Concrete Service Reservoirs and Service Life Prediction

Nanukuttan,

Campbell

2024

RILEM Bookseries

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Effect of calcium leaching on the pore structure, strength, and chloride penetration resistance in concrete specimens

Cited by 94 publications

References 12 publications

Physical and Mechanical Properties of Cementitious Specimens Exposed to an Electrochemically Derived Accelerated Leaching of Calcium

Physical and Mechanical Properties of Cementitious Specimens Exposed to an Electrochemically Derived Accelerated Leaching of Calcium

A numerical study of mechanical behavior of a cement paste under mechanical loading and chemical leaching

Leaching Led Deterioration of Concrete Service Reservoirs and Service Life Prediction

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