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ASME 2013 15th international conference on environmental remediation and radioactive waste management, vol 1 : low/intermediate-level radioactive waste management ; spent fuel ; fissile material, transuranic and high-level radioactive waste management | 2013

Concrete in Engineered Barriers for Radioactive Waste Disposal Facilities: Phenomenological Study and Assessment of Long Term Performance

Diederik Jacques; Norbert Maes; Janez Perko; Suresh Seetharam; Quoc Tri Phung; Ravi Ajitbhai Patel; Albert Soto; Sanheng Liu; Lian Wang; Geert De Schutter; Guang Ye; Klaas van Breugel

The paper aims to highlight recent developments at the Belgian Nuclear Research Centre SCK.CEN in experimental and numerical study of the coupled physical-chemical behaviour of concrete subject to chemical degradation. The discussion mainly focusses on three interlinked research projects covering novel experimental methods to study the alteration of hydraulic and transport properties during carbonation and calcium leaching, a pore scale numerical model to capture microstructural changes due to the above degradation processes and a generic multiscale model aimed at determining evolution of the properties of a macrostructure over the long term. The paper also describes supplementary continuum scale numerical studies concerning concrete-clay interactions and geochemical impact on the physical structure of concrete. Preliminary findings from these studies show encouraging results such as the development of novel leaching, water permeability and diffusion apparatus, a robust pore scale model based on Lattice-Boltzmann method and a mesoscale study focused on the importance of interfacial transition zones on the effective diffusivity for linear and nonlinear diffusion problems.


10th International Conference on Mechanics and Physics of Creep, Shrinkage, and Durability of Concrete and Concrete StructuresRILEMAmerican Society of Civil Engineers | 2015

Evolution of Microstructure and Transport Properties of Cement Pastes Due to Carbonation under a CO2 Pressure Gradient—A Modeling Approach

Quoc Tri Phung; Norbert Maes; Diederik Jacques; G. De Schutter; Guang Ye

Most carbonation models only account for diffusion as the main transport mechanism rather than advection. Nevertheless, in the case of concrete used for underground waste disposal facilities, concrete may be subjected to a high hydrostatic pressure and the surrounding environment may contain a high dissolved CO2 concentration. Therefore, a combination of diffusion and advection should be taken into account. This is also the case in accelerated carbonation where a high CO2 pressure gradient is applied in which advection in the gas phase has a significant contribution to the carbonation process. This study aims at developing a model to predict the evolution of the microstructure and transport properties of cement pastes due to carbonation under accelerated conditions in which a pressure gradient of pure CO2 is applied. The proposed model is based on a macroscopic mass balance for carbon dioxide in gaseous and aqueous phases. Besides the prediction of the changes in transport properties (diffusivity, permeability), the model also enables to predict the changes in microstructure. Data from accelerated tests were used to validate the model. Preliminary verification with experimental results shows a good agreement.


Construction and Building Materials | 2015

Effect of limestone fillers on microstructure and permeability due to carbonation of cement pastes under controlled CO2 pressure conditions

Quoc Tri Phung; Norbert Maes; Diederik Jacques; Els Bruneel; Isabel Van Driessche; Guang Ye; Geert De Schutter


Cement and Concrete Research | 2016

Diffusivity of saturated ordinary Portland cement-based materials: A critical review of experimental and analytical modelling approaches

Ravi Ajitbhai Patel; Quoc Tri Phung; Suresh Seetharam; Janez Perko; Diederik Jacques; Norbert Maes; Geert De Schutter; Guang Ye; Klaas van Breugel


Cement and Concrete Research | 2016

Investigation of the changes in microstructure and transport properties of leached cement pastes accounting for mix composition

Quoc Tri Phung; Norbert Maes; Diederik Jacques; Geert De Schutter; Guang Ye


Construction and Building Materials | 2016

Modelling the carbonation of cement pastes under a CO2 pressure gradient considering both diffusive and convective transport

Quoc Tri Phung; Norbert Maes; Diederik Jacques; Geert De Schutter; Guang Ye; Janez Perko


Cement and Concrete Research | 2011

Effect of wall friction on variation of formwork pressure over time in self-consolidating concrete

Seung Hee Kwon; Quoc Tri Phung; Hong Yong Park; Jae Hong Kim; Surendra P. Shah


Construction and Building Materials | 2016

Modelling the evolution of microstructure and transport properties of cement pastes under conditions of accelerated leaching

Quoc Tri Phung; Norbert Maes; Diederik Jacques; Janez Perko; Geert De Schutter; Guang Ye


Archive | 2015

Effects of carbonation and calcium leaching on microstructure and transport properties of cement pastes

Quoc Tri Phung


CONCRETE SOLUTIONS: PROCEEDINGS OF CONCRETE SOLUTIONS, 5TH INTERNATIONAL CONFERENCE ON CONCRETE REPAIR | 2014

Microstructural and permeability changes due to accelerated Ca leaching in ammonium nitrate solution

Quoc Tri Phung; Norbert Maes; Diederik Jacques; Geert De Schutter; Guang Ye

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Diederik Jacques

Katholieke Universiteit Leuven

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Guang Ye

Delft University of Technology

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Klaas van Breugel

Delft University of Technology

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Jae Hong Kim

Ulsan National Institute of Science and Technology

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