Abstract
Hygro-thermo-chemical-mechanical models, used to determine the variations over time of temperature, relative humidity and shrinkage induced deformations in concrete components, are characterised by the presence of a large number of input parameters. Some of these parameters can be evaluated on the basis of the concrete mix specifications or from literature data, while the others present a large variability and, in some cases, do not have a precise physical meaning and, for this reason, require the implementation of proper identification strategies. The experimental work involved for this characterisation can be time-consuming and costly because based on the long-term monitoring of the time evolution of the field quantities in specific positions within concrete components. The aim of this paper is to propose and validate recursive identification strategies that exploit, in a step by step fashion, the information coming from the experimentation for the identification of the model input parameters. The influence of different exposure conditions and of different concrete thicknesses are investigated and, for each scenario considered, the expected identification error of each parameter is estimated, within a stochastic context implemented through Monte Carlo analyses and Kalman Filter, as a function of the monitored time.
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Abbreviations
- a, b :
-
Parameters associated with the variation of the degree of cement hydration over time
- A c1,A c2,η c :
-
Parameters associated with the variation of the degree of cement hydration over time
- c :
-
Cement content per unit volume
- c t :
-
Concrete specific heat
- D h :
-
Moisture diffusion coefficient
- D 0, D 1, n:
-
Parameters that control the moisture diffusion and depend on the specific concrete mix
- g 1 :
-
Parameter that governs the shape of the sorption curve
- h :
-
Relative humidity
- k c :
-
Parameter associated with non-evaporable water
- k sh :
-
Parameter that relates the change over time of the free shrinkage deformation to the rate of the relative humidity
- \( {\dot{Q}}_{\mathrm{c}} \) :
-
Rate of heat generation due to cement hydration
- \( {\overset{\sim }{Q}}_{\mathrm{c}}^{\infty } \) :
-
Total heat content per unit cement mass due to cement hydration
- RHe :
-
Ambient relative humidity
- T :
-
Temperature
- T e :
-
Ambient temperature
- T 0 :
-
Reference room temperature
- w/c :
-
Water-to-cement ratio
- w n :
-
Non-evaporable water
- w 0 :
-
Initial water content
- α c :
-
Degree of cement hydration
- \( {\alpha}_{\mathrm{c}}^{\infty } \) :
-
Final value of the cement hydration degree
- γ c :
-
Ratio of the hydration activation energy over the universal gas constant
- ε el :
-
Elastic deformation
- ε sh :
-
Shrinkage deformation
- ε tot :
-
Total deformation
- \( {\kappa}_{\mathrm{vg}}^{\mathrm{c}} \) :
-
Parameter that governs the amount of water contained in the cement gel pores
- λ :
-
Concrete heat conductivity
- ρ:
-
Concrete mass density
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The work in this article was supported by the Australian Research Council through its Future Fellowship scheme (FT140100130).
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Appendix
Appendix
1.1 Matrices and vectors of the system in (8) are defined as follows
where symbol \( \underset{e}{\cup } \) refers to the assembly operation typical of the finite element approach, and matrices Ne and Be collect shape functions and their spatial derivatives, respectively.
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Bocciarelli, M., Ranzi, G. Stochastic and recursive estimation of the hygro-thermo-chemical-mechanical parameters of concrete through Monte Carlo analysis and extended Kalman filter. Struct Multidisc Optim 61, 91–110 (2020). https://doi.org/10.1007/s00158-019-02347-y
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DOI: https://doi.org/10.1007/s00158-019-02347-y