A Three-Phase Model of the Elastic and Shrinkage Properties of Mortar

Neubauer, C.M.

doi:10.1016/1065-7355(96)00024-7

Cited by 11 publications

(20 citation statements)

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“…(1) where: ε CS = capillary or chemical shrinkage, α = degree of hydration, V ci = volume of cement before mixing, V hcp = volume of hydrated cementitious paste, V wi = volume of water before mixing. Neubauer et al (1996) previously showed that the shrinkage of the cementitious paste is mainly dependent on the shrinking characteristic of the C-S-H. It was assumed that, the CH, the unreacted C 3 S, and the C 2 S present in the system were acting as restraint to the shrinkage.…”

Section: Shrinkage Of Paste From Micro-scale Studiesmentioning

confidence: 99%

“…For the second step of the model, the elastic modulus of the mortar, E m , bulk modulus of the ITZ is taken as half of that of the cementitious paste. The shear modulus of the ITZ is taken as 0.4 times that of the paste, based on the findings of Neubauer et al (1996). The formulation mentioned above was followed to determine the range of the values using the concept of the H -S bounds.…”

Section: Prediction Of Concrete Shrinkage Using Composite Modelmentioning

confidence: 99%

“…Also, the pores in the cementitious system have zero static moduli. So, it may be assumed that the contribution of the pores to the shrinkage was negligible (Neubauer et al, 1996). Thus, the modified final expression of the shrinkage for the cementitious paste was obtained as follows:…”

Section: Shrinkage Of Paste From Micro-scale Studiesmentioning

confidence: 99%

See 2 more Smart Citations

Prediction of Shrinkage of Concrete Containing Fly Ash and/or Silica Fume Using Composite Modeling

Kar

Ray

Unnikrishnan

et al. 2012

Earth and Space 2012

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Section: Shrinkage Of Paste From Micro-scale Studiesmentioning

confidence: 99%

Section: Prediction Of Concrete Shrinkage Using Composite Modelmentioning

confidence: 99%

See 1 more Smart Citation

Prediction of Shrinkage of Concrete Containing Fly Ash and/or Silica Fume Using Composite Modeling

Kar

Ray

Unnikrishnan

et al. 2012

Earth and Space 2012

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“…As we know, concrete and mortar are not structurally homogeneous. The porosity of ITZ surrounding the aggregate may be either higher or lower than the matrix porosity [14]. This difference diminishes proportionally to the distance of the material from the aggregate surface, being eliminated when ITZ porosity finally reaches matrix porosity [11][12][13].…”

Section: A Geometric Model Of Concrete and Mortar Microstructurementioning

confidence: 99%

“…In some papers [5,11 ], this layer is referred to as interfacial transition zone (ITZ). It has been shown [5,[12][13][14] that ITZ can considerably affect physical and mechanical properties of mortar. Analytic and experimental research conducted has shown that in terms of the modulus of elasticity, shrinkage, permeability of liquids and gases, concrete or mortar can hardly be considered a material consisting merely of such components as aggregate and cement rock.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Mortar Microstructure on Its Thermal Expansion Coefficient

Zabulionis

Marčiukaitis

2003

Journal of Civil Engineering and Management

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Thermal strain is one of the factors causing additional stresses in a composite structure. It is necessary to calculate the coefficient of thermal expansion in evaluating thermal strains. According to the research, concrete is a material consisting of three phases: aggregate, interfacial transition zone (ITZ) and cement paste. The article presents the technique which enables the estimation of the thermal expansion coefficient of the mortar consisting of various aggregate fractions and covered with ITZ layer. A parametric study of various ITZ layer characteristics influencing the coefficient of thermal expansion has been carried out in the present paper. It has been determined that dry mortar or concrete could be treated as a material consisting of two components. While evaluating moist mortar or concrete it is necessary to take into account the depth of the ITZ the bulk modulus and the coefficient of thermal expansion.

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Analytical and 3D numerical analysis of the thermoviscoelastic behavior of concrete-like materials including interfaces

Bary

Bourcier

Helfer

2017

Advances in Engineering Software

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We investigate in this paper analytically and numerically by means of 3D simulations the viscoelastic behavior of concrete and mortar subjected to creep loading and moderate temperatures at mesoscale. These heterogeneous materials are assumed to be composed of thermoelastic aggregates distributed in a linear thermoviscoelastic matrix; moreover, the Interfacial Transition Zones (ITZ) between aggregates and matrix, whose behavior is also considered as linear thermoviscoelastic, are explicitly introduced. The numerical specimens consist in unstructured periodic meshes containing polyhedral aggregates with various size and shapes randomly distributed in a box. Zero-thickness interface finite elements are introduced between aggregates and matrix to model the ITZ. Macroscopic response and averaged stresses and strains in the matrix and aggregate phases are compared to analytical estimations obtained with classical mean-field approximation schemes applied in the Laplace-Carson space, in which the ITZ are introduced via imperfect interfaces modelled with the Linear Spring Model (LSM). The effects of ITZ thickness, aggregate shape and uniform temperature increase are then studied to evaluate their respective influence on the local and macroscopic creep behavior of mortar and concrete. Globally, it is found that the model response is in relatively good agreement with numerical simulations results, and that as expected while the ITZ do not affect significantly the concrete behavior, they have a nonnegligible impact on the mortar one.

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A Three-Phase Model of the Elastic and Shrinkage Properties of Mortar

Cited by 11 publications

References 0 publications

Prediction of Shrinkage of Concrete Containing Fly Ash and/or Silica Fume Using Composite Modeling

Prediction of Shrinkage of Concrete Containing Fly Ash and/or Silica Fume Using Composite Modeling

The Influence of Mortar Microstructure on Its Thermal Expansion Coefficient

Analytical and 3D numerical analysis of the thermoviscoelastic behavior of concrete-like materials including interfaces

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