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...
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2020-02-01
|
| Series: | Materials |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1996-1944/13/4/862 |
| _version_ | 1811330690546925568 |
|---|---|
| author | Jian Zhang Xin-Zhu Zhou Jian-Jun Zheng Hai-Long Ye Jin Yang |
| author_facet | Jian Zhang Xin-Zhu Zhou Jian-Jun Zheng Hai-Long Ye Jin Yang |
| author_sort | Jian Zhang |
| collection | DOAJ |
| 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. |
| first_indexed | 2024-04-13T16:07:34Z |
| format | Article |
| id | doaj.art-0bdb378d9db040dea0682af8ba529fa8 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-04-13T16:07:34Z |
| publishDate | 2020-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-0bdb378d9db040dea0682af8ba529fa82022-12-22T02:40:21ZengMDPI 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 |
| 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 |
| title | 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_short | 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 |
| 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 |