Hygro-thermo-chemical modeling of high performance concrete. I: Theory

Luzio, Giovanni Di; Cusatis, Gianluca

doi:10.1016/j.cemconcomp.2009.02.015

Cited by 172 publications

(123 citation statements)

References 44 publications

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“…Based on this model, h and T distributions can be computed by imposing moisture mass balance and enthalpy balance 8 of 31 equations in the volume of interest. For concrete mixes in which the binder is Portland cement and for temperature not exceeding 90 • C, one can write [74] ∇…”

Section: Hygro-thermo-chemical (Htc) Modelmentioning

confidence: 99%

“…This means that rough average measures of any of these variables are not enough to properly describe the ASR evolution and thus, the need for precise reliable modeling of the moisture and temperature transport and distribution within the concrete internal structure becomes essential. A comprehensive three dimensional Hygro-Thermo-Chemical (HTC) model [74] for the evolution of temperature, humidity and cement hydration degree is adopted in this study. Based on this model, h and T distributions can be computed by imposing moisture mass balance and enthalpy balance 8 of 31 equations in the volume of interest.…”

Section: Hygro-thermo-chemical (Htc) Modelmentioning

confidence: 99%

“…Cement hydration can be characterized by the hydration degree [74,[81][82][83], α c , that represents the fraction of Portland clinker fully reacted with water. Its evolution law can be formulated aṡ…”

Section: Hygro-thermo-chemical (Htc) Modelmentioning

confidence: 99%

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Modeling Time-Dependent Behavior of Concrete Affected by Alkali Silica Reaction in Variable Environmental Conditions

Alnaggar¹,

Luzio²,

Cusatis

2017

Preprint

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Alkali Silica Reaction (ASR) is known to be a serious problem for concrete worldwide, especially in high humidity and high temperature regions. ASR is a slow process that develops over years to decades and it is influenced by changes in environmental and loading conditions of the structure. The problem becomes even more complicated if one recognizes that other phenomena like creep and shrinkage are coupled with ASR. This results in synergistic mechanisms that can not be easily understood without a comprehensive computational model. In this paper, coupling between creep, shrinkage and ASR is modeled within the Lattice Discrete Particle Model (LDPM) framework. In order to achieve this, a multi-physics formulation is used to compute the evolution of temperature, humidity, cement hydration, and ASR in both space and time, which is then used within physics-based formulations of cracking, creep and shrinkage. The overall model is calibrated and validated on the basis of experimental data available in the literature. Results show that even during free expansions (zero macroscopic stress), a significant degree of coupling exists because ASR induced expansions are relaxed by meso-scale creep driven by self-equilibriated stresses at the meso-scale. This explains and highlights the importance of considering ASR and other time dependent aging and deterioration phenomena at an appropriate length scale in coupled modeling approaches.

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Section: Hygro-thermo-chemical (Htc) Modelmentioning

confidence: 99%

Section: Hygro-thermo-chemical (Htc) Modelmentioning

confidence: 99%

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Modeling Time-Dependent Behavior of Concrete Affected by Alkali Silica Reaction in Variable Environmental Conditions

Alnaggar¹,

Luzio²,

Cusatis

2017

Preprint

Self Cite

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show abstract

“…Thus the variation of relative humidity may be obtained by considering the effect of self-desiccation and moisture diffusion in concrete Lee 1999, Oh andCha2003). Bazant and Najjar 1972, Luzio (2009aand 2009b have modeled the moisture diffusion in hardened concrete. For early-age hardening concrete, due to the ignorance of the dependence of moisture diffusivity on aging of concrete, Bazant and Najjar (1972) and Luzio( 2009a and2009b)' s work are not valid.…”

Section: Introductionmentioning

confidence: 99%

“…Bazant and Najjar 1972, Luzio (2009aand 2009b have modeled the moisture diffusion in hardened concrete. For early-age hardening concrete, due to the ignorance of the dependence of moisture diffusivity on aging of concrete, Bazant and Najjar (1972) and Luzio( 2009a and2009b)' s work are not valid. Yuan and Wan (2002) proposed a numerical procedure to evaluate the thermal, drying and creep behavior of young concrete.…”

Section: Introductionmentioning

confidence: 99%

Prediction of Temperature and Moisture Distributions in Hardening Concrete By Using a Hydration Model

Park¹

2012

Architectural research

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This paper presents an integrated procedure to predict the temperature and moisture distributions in hardening concrete considering the effects of temperature and aging. The degree of hydration is employed as a fundamental parameter to evaluate hydrothermal-mechanical properties of hardening concrete. The temperature history and temperature distribution in hardening concrete is evaluated by combining cement hydration model with three-dimensional finite element thermal analysis. On the other hand, the influences of both self-desiccation and moisture diffusion on variation of relative humidity are considered. The self-desiccation is evaluated by using a semi-empirical expression with desorption isotherm and degree of hydration. The moisture diffusivity is expressed as a function of degree of hydration and current relative humidity. The proposed procedure is verified with experimental results and can be used to evaluate the early-age crack of hardening concrete.

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Research Progress on Numerical Models for Self‐Healing Cementitious Materials

Jefferson

Javierre

Freeman

et al. 2018

Adv Materials Inter

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In this paper, research progress on numerical models for self‐healing cementitious materials (SHCMs) is discussed. Models developed specifically for SHCMs, as well as other relevant work, are considered. A summary of current self‐healing (SH) techniques is provided along with descriptions of the processes that govern their behavior. Models for mechanical self‐healing, transport processes in materials with embedded healing systems, fully coupled models, and other modeling techniques used to simulate SH behavior are discussed. The mechanics models discussed include those based on continuum–damage–healing mechanics (CDHM), micromechanics, as well as models that use discrete elements and particle methods. A considerable section is devoted to the simulation of carbonation in concrete since the essential mechanisms that govern this process are applicable to SH systems that employ calcite as a healing material. A number of transport models for simulating early‐age self‐healing are also considered. This highlights the fact that there are currently very few papers that describe fully coupled models, although a number of approaches that couple some aspects of transport and mechanical healing behavior are discussed. This article closes with a discussion that highlights the fact that many models are presented with limited or no experimental validation.

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Hygro-thermo-chemical modeling of high performance concrete. I: Theory

Cited by 172 publications

References 44 publications

Modeling Time-Dependent Behavior of Concrete Affected by Alkali Silica Reaction in Variable Environmental Conditions

Modeling Time-Dependent Behavior of Concrete Affected by Alkali Silica Reaction in Variable Environmental Conditions

Prediction of Temperature and Moisture Distributions in Hardening Concrete By Using a Hydration Model

Research Progress on Numerical Models for Self‐Healing Cementitious Materials

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