Early-age behaviour of concrete nuclear containments

A numerical model has been developed to predict early-age cracking for massive concrete structures. Taking into account creep at early-age is essential if one wants to predict quantitatively the induced stresses if autogenous or thermal strains are restrained. Because creep strains may relax internal stresses, a creep model which includes the effects of hydration and temperature is used. For the prediction of cracking, a simple elastic damage model is used. Numerical simulations are performed in order to predict the behaviour of a massive wall and a concrete containment of a nuclear power plant. They show that significant relaxation of stresses (due to creep) occurs only after about 10 days, after cracking occurs. Moreover, since temperature in concrete may reach important values in massive concrete structures, it appears that effect of temperature on creep must be taken into account for an accurate prediction of cracking.

[1]  Z. Bažant,et al.  Rate-type creep law of aging concrete based on maxwell chain , 1974 .

[2]  G. D. Schutter.  Degree of hydration based Kelvin model for the basic creep of early age concrete , 1999 .

[3]  C. W. Yu,et al.  Creep of concrete under uniaxial and biaxial stresses at elevated temperatures , 1967 .

[4]  Ahmed Loukili,et al.  Autogenous deformations of cement pastes: Part I. Temperature effects at early age and micro–macro correlations , 2006 .

[5]  J. Rots.  Computational modeling of concrete fracture , 1988 .

[6]  Luc Taerwe,et al.  Fracture energy of concrete at early ages , 1997 .

[7]  H. Stang,et al.  Tensile basic creep of early-age concrete under constant load , 2001 .

[8]  Sven Thelandersson,et al.  Modeling of Combined Thermal and Mechanical Action in Concrete , 1987 .

[9]  Jean-Pierre Bardet,et al.  Plane-Strain Instability of Saturated Porous Media , 1995 .

[10]  Jean-Michel Torrenti,et al.  Stresses in Early-Age Concrete: Comparison of DifferentCreep Models , 1996 .

[11]  J. Hattel,et al.  A numerical model for predicting the thermomechanical conditions during hydration of early-age concrete , 2003 .

[12]  Luc Taerwe,et al.  Degree of hydration-based description of mechanical properties of early age concrete , 1996 .

[13]  Roman Lackner,et al.  A multiscale micromechanics model for the autogenous-shrinkage deformation of early-age cement-based materials , 2007 .

[14]  G. De Schutter.  Fundamental study of early age concrete behaviour as a basis for durable concrete structures , 2002 .

[15]  Zdeněk P. Bažant,et al.  Mathematical modeling of creep and shrinkage of concrete , 1988 .

[16]  A. W. Gutsch,et al.  Properties of early age concrete-Experiments and modelling , 2002 .

[17]  de R René Borst,et al.  Finite-Element Modeling of Deformation and Cracking in Early-Age Concrete , 1994 .

[18]  Gilles Escadeillas,et al.  Coefficient de dilatation thermique d'un mortier frais , 2002 .

[19]  Yanyong Xiang,et al.  Thermal–mechanical analysis of a newly cast concrete wall of a subway structure , 2005 .

[20]  Koichi Maekawa,et al.  A unified solidification model of hardening concrete composite for predicting the young age behavior of concrete , 2004 .

[21]  K. van Breugel,et al.  Simulation of the effect of geometrical changes of the microstructure on the deformational behaviour of hardening concrete , 1997 .

[22]  Gilles Chanvillard,et al.  Determining the apparent activation energy of concrete Ea: numerical simulations of the heat of hydration of cement , 2002 .

[23]  C. Boulay,et al.  Evolution du coefficient de dilatation thermique du béton en fonction de sa maturité aux tout premiers âges , 1994 .

[24]  Günther Meschke,et al.  CONSIDERATION OF AGING OF SHOTCRETE IN THE CONTEXT OF A 3‐D VISCOPLASTIC MATERIAL MODEL , 1996 .

[25]  Zdenek P. Bazant,et al.  I: Formulation , 2022 .

[26]  S. Xia,et al.  A nonlocal damage theory , 1987 .

[27]  Rui Faria,et al.  Modelling of concrete at early ages: Application to an externally restrained slab , 2006 .

[28]  J. Mazars.  A description of micro- and macroscale damage of concrete structures , 1986 .

[29]  Lars Damkilde,et al.  TRANSITIONAL THERMAL CREEP OF EARLY AGE CONCRETE , 1999 .

[30]  Miguel Cervera,et al.  Mesh objective tensile cracking via a local continuum damage model and a crack tracking technique , 2006 .

[31]  Anton K. Schindler,et al.  Effect of Temperature on Hydration of Cementitious Materials , 2004 .

[32]  Franz-Josef Ulm,et al.  Microprestress-Solidification Theory for Concrete Creep. I: Aging and Drying Effects , 1997 .

[33]  Farid Benboudjema,et al.  Mechanical threshold of cementitious materials at early age , 2005 .

[34]  Brahim Benmokrane,et al.  BOND STRENGTH AND LOAD DISTRIBUTION OF COMPOSITE GFRP REINFORCING BARS IN CONCRETE , 1996 .

[35]  Jan Byfors,et al.  Plain concrete at early ages , 1980 .

[36]  Ahmed Loukili,et al.  A new approach to determine autogenous shrinkage of mortar at an early age considering temperature history , 2000 .

[37]  G. De Schutter,et al.  Finite element simulation of thermal cracking in massive hardening concrete elements using degree of hydration based material laws , 2002 .

[38]  S. Lykke,et al.  Prediction and Control of Early-Age Cracking: Experiences From the Oresund Tunnel , 2000 .

[39]  Ahmed Loukili,et al.  Can the maturity concept be used to separate the autogenous shrinkage and thermal deformation of a cement paste at early age , 2002 .

[40]  Dawood Soliman Atrushi.  Tensile and Compressive Creep of Young Concrete: Testing and Modelling , 2003 .

[41]  Bruno Massicotte,et al.  Modeling the Thermal Stresses at Early Ages in a Concrete Monolith , 1997 .

[42]  Olivier Coussy,et al.  Couplings in early-age concrete: From material modeling to structural design , 1998 .

[43]  Z. Bažant,et al.  Nonlocal damage theory , 1987 .

[44]  Miguel Cervera,et al.  THERMO-CHEMO-MECHANICAL MODEL FOR CONCRETE. I: HYDRATION AND AGING , 1999 .

[45]  F. Cussigh,et al.  Using the maturity method in concrete cracking control at early ages , 2004 .

[46]  Roman Lackner,et al.  Chemoplastic material model for the simulation of early-age cracking: From the constitutive law to numerical analyses of massive concrete structures , 2004 .