Next Article in Journal
The Study of Non-Detection Zones in Conventional Long-Distance Ultrasonic Guided Wave Inspection on Square Steel Bars
Previous Article in Journal
Structural Optimization of a High-Speed Press Considering Multi-Source Uncertainties Based on a New Heterogeneous TOPSIS
Article Menu
Issue 1 (January) cover image

Export Article

Open AccessArticle
Appl. Sci. 2018, 8(1), 128; https://doi.org/10.3390/app8010128

Pore Solution pH for the Corrosion Initiation of Rebars Embedded in Concrete under a Long-Term Natural Carbonation Reaction

College of Civil Engineering, Xi’an University of Architecture & Technology, 13 Yanta Road, Xi’an 710055, China
*
Author to whom correspondence should be addressed.
Received: 16 December 2017 / Revised: 12 January 2018 / Accepted: 15 January 2018 / Published: 17 January 2018
(This article belongs to the Section Materials)
Full-Text   |   PDF [3655 KB, uploaded 17 January 2018]   |  

Abstract

This paper presents an in-situ inspection and experimental investigation on the pore solution pH of concrete cover for the corrosion initiation of rebars under a long-term natural carbonation reaction. A 77-year-old steel mill was inspected, and 35 concrete column cover samples were collected to test the pH of the pore solution and phase compositions layer by layer. The variation in pH and phase compositions of the concrete along the cover depth was studied. The in-situ inspection results indicate that the rebar embedded in concrete had begun to corrode when the carbonation depth was almost less than one-third of the cover depth. The corrosion initiation of rebars embedded in concrete can occur when the pH is between 11.3 and 12.1. The pore solution pH test results and X-ray diffraction (XRD) analysis indicated that there is a semi-carbonated zone between the fully carbonated zone and the rebar. The pH of a fully carbonated zone is in a range of 8.0–9.5, and the pH of a semi-carbonated zone is between 9.5 and 12.1. View Full-Text
Keywords: corrosion; carbonation; expression method; pore solution; pH; XRD corrosion; carbonation; expression method; pore solution; pH; XRD
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
SciFeed

Share & Cite This Article

MDPI and ACS Style

Liu, X.; Niu, D.; Li, X.; Lv, Y.; Fu, Q. Pore Solution pH for the Corrosion Initiation of Rebars Embedded in Concrete under a Long-Term Natural Carbonation Reaction. Appl. Sci. 2018, 8, 128.

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.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Appl. Sci. EISSN 2076-3417 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top