Multiscale Thermoelastic Analysis of the Thermal Expansion Coefficient and of Microscopic Thermal Stresses of Mature Concrete

The thermal expansion coefficient and the microscopic thermal stresses of mature concrete depend on its microstructural composition and the internal relative humidity. This dependence is determined by means of thermoelastic multiscale analysis of concrete. The underlying multiscale model enables two...

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Main Authors: Hui Wang, Herbert Mang, Yong Yuan, Bernhard L. A. Pichler
Format: Article
Language:English
Published: MDPI AG 2019-08-01
Series:Materials
Subjects:
Online Access:https://www.mdpi.com/1996-1944/12/17/2689
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spelling doaj-d8e80ea73b9542fbb4d0b6f0f6833cfb2020-11-24T21:49:21ZengMDPI AGMaterials1996-19442019-08-011217268910.3390/ma12172689ma12172689Multiscale Thermoelastic Analysis of the Thermal Expansion Coefficient and of Microscopic Thermal Stresses of Mature ConcreteHui Wang0Herbert Mang1Yong Yuan2Bernhard L. A. Pichler3College of Civil Engineering, Tongji University, Shanghai 200092, ChinaCollege of Civil Engineering, Tongji University, Shanghai 200092, ChinaCollege of Civil Engineering, Tongji University, Shanghai 200092, ChinaInstitute for Mechanics of Materials and Structures, TU Wien—Vienna University of Technology, Karlsplatz 13/202, 1040 Vienna, AustriaThe thermal expansion coefficient and the microscopic thermal stresses of mature concrete depend on its microstructural composition and the internal relative humidity. This dependence is determined by means of thermoelastic multiscale analysis of concrete. The underlying multiscale model enables two types of scale transition. Firstly, bottom-up homogenization allows for the quantification of the thermal expansion coefficient and the elastic stiffness of concrete based on the Mori-Tanaka scheme. Secondly, top-down scale concentration gives access to the volume averaged stresses experienced by the cement paste, the fine and the coarse aggregates and, furthermore, to the stress states of the interfacial transition zones covering the aggregates. The proposed model is validated by comparing the predicted thermal expansion coefficient of concrete with independent sets of experimental measurements. Finally, sensitivity analyses are carried out to evaluate the influence of the volumetric composition and the internal relative humidity of concrete on the thermal expansion coefficient and the microscopic thermal stresses.https://www.mdpi.com/1996-1944/12/17/2689concretethermal expansionmicrostressesthermoelastictemperature
collection DOAJ
language English
format Article
sources DOAJ
author Hui Wang
Herbert Mang
Yong Yuan
Bernhard L. A. Pichler
spellingShingle Hui Wang
Herbert Mang
Yong Yuan
Bernhard L. A. Pichler
Multiscale Thermoelastic Analysis of the Thermal Expansion Coefficient and of Microscopic Thermal Stresses of Mature Concrete
Materials
concrete
thermal expansion
microstresses
thermoelastic
temperature
author_facet Hui Wang
Herbert Mang
Yong Yuan
Bernhard L. A. Pichler
author_sort Hui Wang
title Multiscale Thermoelastic Analysis of the Thermal Expansion Coefficient and of Microscopic Thermal Stresses of Mature Concrete
title_short Multiscale Thermoelastic Analysis of the Thermal Expansion Coefficient and of Microscopic Thermal Stresses of Mature Concrete
title_full Multiscale Thermoelastic Analysis of the Thermal Expansion Coefficient and of Microscopic Thermal Stresses of Mature Concrete
title_fullStr Multiscale Thermoelastic Analysis of the Thermal Expansion Coefficient and of Microscopic Thermal Stresses of Mature Concrete
title_full_unstemmed Multiscale Thermoelastic Analysis of the Thermal Expansion Coefficient and of Microscopic Thermal Stresses of Mature Concrete
title_sort multiscale thermoelastic analysis of the thermal expansion coefficient and of microscopic thermal stresses of mature concrete
publisher MDPI AG
series Materials
issn 1996-1944
publishDate 2019-08-01
description The thermal expansion coefficient and the microscopic thermal stresses of mature concrete depend on its microstructural composition and the internal relative humidity. This dependence is determined by means of thermoelastic multiscale analysis of concrete. The underlying multiscale model enables two types of scale transition. Firstly, bottom-up homogenization allows for the quantification of the thermal expansion coefficient and the elastic stiffness of concrete based on the Mori-Tanaka scheme. Secondly, top-down scale concentration gives access to the volume averaged stresses experienced by the cement paste, the fine and the coarse aggregates and, furthermore, to the stress states of the interfacial transition zones covering the aggregates. The proposed model is validated by comparing the predicted thermal expansion coefficient of concrete with independent sets of experimental measurements. Finally, sensitivity analyses are carried out to evaluate the influence of the volumetric composition and the internal relative humidity of concrete on the thermal expansion coefficient and the microscopic thermal stresses.
topic concrete
thermal expansion
microstresses
thermoelastic
temperature
url https://www.mdpi.com/1996-1944/12/17/2689
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AT yongyuan multiscalethermoelasticanalysisofthethermalexpansioncoefficientandofmicroscopicthermalstressesofmatureconcrete
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