Experimental Investigation and Analytical Modeling of Chloride Diffusivity of Fly Ash Concrete

Owing to its importance in the assessment of reinforced concrete structures, it is essential to determine the chloride diffusivity of fly ash concrete. This paper presents an investigation into the diffusion characteristics of chloride ions in fly ash concrete. Through experiment, the relationship b...

Full description

Bibliographic Details
Main Authors: Jian Zhang, Xin-Zhu Zhou, Jian-Jun Zheng, Hai-Long Ye, Jin Yang
Format: Article
Language:English
Published: MDPI AG 2020-02-01
Series:Materials
Subjects:
Online Access:https://www.mdpi.com/1996-1944/13/4/862
id doaj-0bdb378d9db040dea0682af8ba529fa8
record_format Article
spelling doaj-0bdb378d9db040dea0682af8ba529fa82020-11-24T21:47:15ZengMDPI AGMaterials1996-19442020-02-0113486210.3390/ma13040862ma13040862Experimental Investigation and Analytical Modeling of Chloride Diffusivity of Fly Ash ConcreteJian Zhang0Xin-Zhu Zhou1Jian-Jun Zheng2Hai-Long Ye3Jin Yang4Jiyang College, Zhejiang Agriculture and Forestry University, Zhuji 311800, ChinaSchool of Civil Engineering and Architecture, Zhejiang University of Technology, Hangzhou 310023, ChinaSchool of Civil Engineering and Architecture, Zhejiang University of Technology, Hangzhou 310023, ChinaDepartment of Civil Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong, ChinaJiyang College, Zhejiang Agriculture and Forestry University, Zhuji 311800, ChinaOwing to its importance in the assessment of reinforced concrete structures, it is essential to determine the chloride diffusivity of fly ash concrete. This paper presents an investigation into the diffusion characteristics of chloride ions in fly ash concrete. Through experiment, the relationship between chloride diffusivity and curing age up to 1800 days is measured and the effects of curing age, water/binder ratio, aggregate volume fraction, and fly ash content (i.e., percentage of total cementitious material by mass) on chloride diffusivity are evaluated. It is found that the chloride diffusivity decreases with the increase of curing age, aggregate volume fraction, and fly ash content, but increases with the increase of water/binder ratio. In analytical modeling, an equivalent aggregate model is constructed and the equivalent interfacial transition zone (ITZ) thickness is derived analytically. With the equivalent aggregate model, three-phase fly ash concrete reduces to a two-phase composite material. By extending the Maxwell method, the chloride diffusivity of fly ash concrete is formulated. Finally, the validity of the analytical method is verified by experimental results.https://www.mdpi.com/1996-1944/13/4/862fly ash concretechloride diffusivityexperimental investigationanalytical method
collection DOAJ
language English
format Article
sources DOAJ
author Jian Zhang
Xin-Zhu Zhou
Jian-Jun Zheng
Hai-Long Ye
Jin Yang
spellingShingle Jian Zhang
Xin-Zhu Zhou
Jian-Jun Zheng
Hai-Long Ye
Jin Yang
Experimental Investigation and Analytical Modeling of Chloride Diffusivity of Fly Ash Concrete
Materials
fly ash concrete
chloride diffusivity
experimental investigation
analytical method
author_facet Jian Zhang
Xin-Zhu Zhou
Jian-Jun Zheng
Hai-Long Ye
Jin Yang
author_sort Jian Zhang
title Experimental Investigation and Analytical Modeling of Chloride Diffusivity of Fly Ash Concrete
title_short Experimental Investigation and Analytical Modeling of Chloride Diffusivity of Fly Ash Concrete
title_full Experimental Investigation and Analytical Modeling of Chloride Diffusivity of Fly Ash Concrete
title_fullStr Experimental Investigation and Analytical Modeling of Chloride Diffusivity of Fly Ash Concrete
title_full_unstemmed Experimental Investigation and Analytical Modeling of Chloride Diffusivity of Fly Ash Concrete
title_sort experimental investigation and analytical modeling of chloride diffusivity of fly ash concrete
publisher MDPI AG
series Materials
issn 1996-1944
publishDate 2020-02-01
description Owing to its importance in the assessment of reinforced concrete structures, it is essential to determine the chloride diffusivity of fly ash concrete. This paper presents an investigation into the diffusion characteristics of chloride ions in fly ash concrete. Through experiment, the relationship between chloride diffusivity and curing age up to 1800 days is measured and the effects of curing age, water/binder ratio, aggregate volume fraction, and fly ash content (i.e., percentage of total cementitious material by mass) on chloride diffusivity are evaluated. It is found that the chloride diffusivity decreases with the increase of curing age, aggregate volume fraction, and fly ash content, but increases with the increase of water/binder ratio. In analytical modeling, an equivalent aggregate model is constructed and the equivalent interfacial transition zone (ITZ) thickness is derived analytically. With the equivalent aggregate model, three-phase fly ash concrete reduces to a two-phase composite material. By extending the Maxwell method, the chloride diffusivity of fly ash concrete is formulated. Finally, the validity of the analytical method is verified by experimental results.
topic fly ash concrete
chloride diffusivity
experimental investigation
analytical method
url https://www.mdpi.com/1996-1944/13/4/862
work_keys_str_mv AT jianzhang experimentalinvestigationandanalyticalmodelingofchloridediffusivityofflyashconcrete
AT xinzhuzhou experimentalinvestigationandanalyticalmodelingofchloridediffusivityofflyashconcrete
AT jianjunzheng experimentalinvestigationandanalyticalmodelingofchloridediffusivityofflyashconcrete
AT hailongye experimentalinvestigationandanalyticalmodelingofchloridediffusivityofflyashconcrete
AT jinyang experimentalinvestigationandanalyticalmodelingofchloridediffusivityofflyashconcrete
_version_ 1725898332130246656