Simulation of self-healing by further hydration in cementitious materials

Cracks, caused by shrinkage and external loading, facilitate the ingress of aggressive and harmful substances into concrete and indeed reduce the durability of the structures. It is well known that self-healing of cracks can significantly improve the durability of the concrete structure. In this research, self-healing of cracks was proposed to be realized by providing extra water for further hydration of unhydrated cement particles. In order to provide theoretical guidance for the practice, self-healing by providing extra water to promote further hydration was simulated. The simulation was based on water transport theory, ion diffusion theory and thermodynamics theory. In the simulation, self-healing efficiency under different conditions as a function of time was calculated. The relationship between self-healing efficiency and the amount of extra water from the broken capsules was determined. According to the results of the simulation, the amount of extra water can be optimized by considering self-healing efficiency and other performances.

[1]  Aaron R. Sakulich,et al.  Self-Healing Characterization of Engineered Cementitious Composite Materials , 2010 .

[2]  K. Van Breugel,et al.  Simulation of hydration and formation of structure in hardening cement-based materials , 1991 .

[3]  Ahmed Loukili,et al.  Monitoring of cracking and healing in an ultra high performance cementitious material using the time reversal technique , 2009 .

[4]  F. J. Pearson,et al.  Nagra/PSI Chemical Thermodynamic Data Base 01/01 , 2002 .

[5]  Gilles Pijaudier-Cabot,et al.  Experimental characterization of the self-healing of cracks in an ultra high performance cementitious material: Mechanical tests and acoustic emission analysis , 2007 .

[6]  Eduardus A. B. Koenders,et al.  Simulation of volume changes in hardening cement-based materials : proefschrift , 1997 .

[7]  B. Lothenbach,et al.  Thermodynamic modelling of the hydration of Portland cement , 2006 .

[8]  Shunzhi Qian,et al.  Self-healing behavior of strain hardening cementitious composites incorporating local waste materials , 2009 .

[9]  M. Stroeven,et al.  SELF-HEALING CAPACITY OF CONCRETE - COMPUTER SIMULATION STUDY OF UNHYDRATED CEMENT STRUCTURE , 2011 .

[10]  Guang Ye,et al.  Experimental Study and Numerical Simulation of the Development of the Microstructure and Permeability of Cementitious Materials , 2003 .

[11]  Denys Breysse,et al.  Image analysis for the automated study of microcracks in concrete , 2001 .

[12]  B. Lothenbach.  Thermodynamic equilibrium calculations in cementitious systems , 2010 .

[13]  I. Odler,et al.  Early hydration of tricalcium silicate II. The induction period , 1979 .

[14]  H. Taylor,et al.  A multi-method study of C3S hydration , 1978 .

[15]  John Crank,et al.  The Mathematics Of Diffusion , 1956 .

[16]  D. Crerar,et al.  Thermodynamics in Geochemistry: The Equilibrium Model , 1993 .

[17]  William H. Press,et al.  Numerical Recipes: FORTRAN , 1988 .

[18]  Shinya Nagasaki,et al.  A model for dissolution of CaO-SiO2-H2O gel at Ca/Si > 1 , 1999 .

[19]  Xianming Shi,et al.  A self-healing cementitious composite using oil core/silica gel shell microcapsules , 2011 .

[20]  E. Garboczi,et al.  Computer simulation of the diffusivity of cement-based materials , 1992 .

[21]  Edward L Cussler,et al.  Diffusion: Mass Transfer in Fluid Systems , 1984 .

[22]  Yun Mook Lim,et al.  Feasibility study of a passive smart self-healing cementitious composite , 1998 .

[23]  Carola Edvardsen,et al.  Water Permeability and Autogenous Healing of Cracks in Concrete , 1999 .

[24]  Carolyn M. Dry,et al.  Three-part methylmethacrylate adhesive system as an internal delivery system for smart responsive concrete , 1996 .

[25]  K. van Breugel,et al.  CRACK HEALING OF EARLY AGE CRACKS IN CONCRETE , 2006 .

[26]  B. Lubelli,et al.  Self healing phenomena in concretes and masonry mortars: A microscopic study , 2007 .

[27]  E. Reardon,et al.  An ion interaction model for the determination of chemical equilibria in cement/water systems , 1990 .

[28]  Patric Jacobs,et al.  Self-healing efficiency of cementitious materials containing tubular capsules filled with healing agent , 2011 .

[29]  Toshiharu Kishi,et al.  Crack Self-healing Behavior of Cementitious Composites Incorporating Various Mineral Admixtures , 2010 .