Study on the heat-moisture transfer in concrete under real environment

Bongsuk Cho, Dongcheon Park, Jeongho Kim, Hitoshi Hamasaki

Research output: Contribution to journalArticle

  • 2 Citations

Abstract

Surplus water inside a concrete other than moisture that is used for hydration of the cement affects the physical properties of the concrete (modulus of elasticity, compressive strength, drying shrinkage, and creep) by drying. Changes in temperature and humidity inside a concrete has correlation with the movement speed and reaction rate of deterioration factors such as carbon dioxide and chloride ions. Though the prediction of temperature and humidity inside a concrete is an important research field, there are not enough research achievements about it due to difficulties in measurement. In this study, comparison was performed between temperature and relative humidity inside the concrete and meteorological data for exposure environment through measurement at the site for two years. Surface temperature of the concrete (depth 1 cm) was measured higher by 6 °C during the summers, while it was measured lower by 2 °C during the winters due to solar radiation, wind, and radiation cooling. As for relative humidity, change was large in the depth of 1 cm, while more than 85% was maintained in the depth of 10 cm. A heat-moisture coupling model was prepared using FEM for the test results. With the coupling model, temperature could be predicted with a high degree of accuracy. However, daily changes of the humidity could not be simulated with the model. It might be because ink bottle effect and hysteresis effect could not be reflected as a form developed from the macroscopic model based on the partial differential equation. Yet, the proposed model could predict average relative humidity changes capable of evaluating long-term durability evaluation.

LanguageEnglish
Pages124-129
Number of pages6
JournalConstruction and Building Materials
Volume132
DOIs
StatePublished - 2017 Feb 1

Fingerprint

Atmospheric humidity
Moisture
Concretes
Drying
Temperature
Bottles
Solar radiation
Ink
Carbon Dioxide
Hydration
Compressive strength
Partial differential equations
Reaction rates
Deterioration
Hysteresis
Hot Temperature
Chlorides
Carbon dioxide
Cements
Creep

Keywords

  • Concrete
  • FE coupling model
  • Natural environment
  • Relative humidity
  • Temperature

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Materials Science(all)

Cite this

Study on the heat-moisture transfer in concrete under real environment. / Cho, Bongsuk; Park, Dongcheon; Kim, Jeongho; Hamasaki, Hitoshi.

In: Construction and Building Materials, Vol. 132, 01.02.2017, p. 124-129.

Research output: Contribution to journalArticle

Cho, Bongsuk ; Park, Dongcheon ; Kim, Jeongho ; Hamasaki, Hitoshi. / Study on the heat-moisture transfer in concrete under real environment. In: Construction and Building Materials. 2017 ; Vol. 132. pp. 124-129
@article{9434e0dbed044cb5ab86ba43763c210a,
title = "Study on the heat-moisture transfer in concrete under real environment",
abstract = "Surplus water inside a concrete other than moisture that is used for hydration of the cement affects the physical properties of the concrete (modulus of elasticity, compressive strength, drying shrinkage, and creep) by drying. Changes in temperature and humidity inside a concrete has correlation with the movement speed and reaction rate of deterioration factors such as carbon dioxide and chloride ions. Though the prediction of temperature and humidity inside a concrete is an important research field, there are not enough research achievements about it due to difficulties in measurement. In this study, comparison was performed between temperature and relative humidity inside the concrete and meteorological data for exposure environment through measurement at the site for two years. Surface temperature of the concrete (depth 1 cm) was measured higher by 6 °C during the summers, while it was measured lower by 2 °C during the winters due to solar radiation, wind, and radiation cooling. As for relative humidity, change was large in the depth of 1 cm, while more than 85{\%} was maintained in the depth of 10 cm. A heat-moisture coupling model was prepared using FEM for the test results. With the coupling model, temperature could be predicted with a high degree of accuracy. However, daily changes of the humidity could not be simulated with the model. It might be because ink bottle effect and hysteresis effect could not be reflected as a form developed from the macroscopic model based on the partial differential equation. Yet, the proposed model could predict average relative humidity changes capable of evaluating long-term durability evaluation.",
keywords = "Concrete, FE coupling model, Natural environment, Relative humidity, Temperature",
author = "Bongsuk Cho and Dongcheon Park and Jeongho Kim and Hitoshi Hamasaki",
year = "2017",
month = "2",
day = "1",
doi = "10.1016/j.conbuildmat.2016.11.121",
language = "English",
volume = "132",
pages = "124--129",
journal = "Construction and Building Materials",
issn = "0950-0618",
publisher = "Elsevier Limited",

}

TY - JOUR

T1 - Study on the heat-moisture transfer in concrete under real environment

AU - Cho,Bongsuk

AU - Park,Dongcheon

AU - Kim,Jeongho

AU - Hamasaki,Hitoshi

PY - 2017/2/1

Y1 - 2017/2/1

N2 - Surplus water inside a concrete other than moisture that is used for hydration of the cement affects the physical properties of the concrete (modulus of elasticity, compressive strength, drying shrinkage, and creep) by drying. Changes in temperature and humidity inside a concrete has correlation with the movement speed and reaction rate of deterioration factors such as carbon dioxide and chloride ions. Though the prediction of temperature and humidity inside a concrete is an important research field, there are not enough research achievements about it due to difficulties in measurement. In this study, comparison was performed between temperature and relative humidity inside the concrete and meteorological data for exposure environment through measurement at the site for two years. Surface temperature of the concrete (depth 1 cm) was measured higher by 6 °C during the summers, while it was measured lower by 2 °C during the winters due to solar radiation, wind, and radiation cooling. As for relative humidity, change was large in the depth of 1 cm, while more than 85% was maintained in the depth of 10 cm. A heat-moisture coupling model was prepared using FEM for the test results. With the coupling model, temperature could be predicted with a high degree of accuracy. However, daily changes of the humidity could not be simulated with the model. It might be because ink bottle effect and hysteresis effect could not be reflected as a form developed from the macroscopic model based on the partial differential equation. Yet, the proposed model could predict average relative humidity changes capable of evaluating long-term durability evaluation.

AB - Surplus water inside a concrete other than moisture that is used for hydration of the cement affects the physical properties of the concrete (modulus of elasticity, compressive strength, drying shrinkage, and creep) by drying. Changes in temperature and humidity inside a concrete has correlation with the movement speed and reaction rate of deterioration factors such as carbon dioxide and chloride ions. Though the prediction of temperature and humidity inside a concrete is an important research field, there are not enough research achievements about it due to difficulties in measurement. In this study, comparison was performed between temperature and relative humidity inside the concrete and meteorological data for exposure environment through measurement at the site for two years. Surface temperature of the concrete (depth 1 cm) was measured higher by 6 °C during the summers, while it was measured lower by 2 °C during the winters due to solar radiation, wind, and radiation cooling. As for relative humidity, change was large in the depth of 1 cm, while more than 85% was maintained in the depth of 10 cm. A heat-moisture coupling model was prepared using FEM for the test results. With the coupling model, temperature could be predicted with a high degree of accuracy. However, daily changes of the humidity could not be simulated with the model. It might be because ink bottle effect and hysteresis effect could not be reflected as a form developed from the macroscopic model based on the partial differential equation. Yet, the proposed model could predict average relative humidity changes capable of evaluating long-term durability evaluation.

KW - Concrete

KW - FE coupling model

KW - Natural environment

KW - Relative humidity

KW - Temperature

UR - http://www.scopus.com/inward/record.url?scp=84999683604&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84999683604&partnerID=8YFLogxK

U2 - 10.1016/j.conbuildmat.2016.11.121

DO - 10.1016/j.conbuildmat.2016.11.121

M3 - Article

VL - 132

SP - 124

EP - 129

JO - Construction and Building Materials

T2 - Construction and Building Materials

JF - Construction and Building Materials

SN - 0950-0618

ER -