Next Article in Journal
Load Capacity and Displacement of Recycled Concrete and Self-Insulation Block Masonry Wall
Previous Article in Journal
Friction-Stir Welding of a Wrought Al-Si-Mg Alloy in As-Fabricated and Heat-Treatment States
Open AccessArticle

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

1
Jiyang College, Zhejiang Agriculture and Forestry University, Zhuji 311800, China
2
School of Civil Engineering and Architecture, Zhejiang University of Technology, Hangzhou 310023, China
3
Department of Civil Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong, China
*
Author to whom correspondence should be addressed.
Materials 2020, 13(4), 862; https://doi.org/10.3390/ma13040862
Received: 17 December 2019 / Revised: 5 February 2020 / Accepted: 10 February 2020 / Published: 14 February 2020
(This article belongs to the Section Construction and Building Materials)
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. View Full-Text
Keywords: fly ash concrete; chloride diffusivity; experimental investigation; analytical method fly ash concrete; chloride diffusivity; experimental investigation; analytical method
Show Figures

Figure 1

MDPI and ACS Style

Zhang, J.; Zhou, X.-Z.; Zheng, J.-J.; Ye, H.-L.; Yang, J. Experimental Investigation and Analytical Modeling of Chloride Diffusivity of Fly Ash Concrete. Materials 2020, 13, 862.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop