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Stellenbosch University

1. Bezuidenhout, Schalk Ruan. Corrosion propagation in cracked reinforced concrete structures.

Degree: MEng, Civil Engineering, 2017, Stellenbosch University

ENGLISH ABSTRACT: The durability of a reinforced concrete (RC) structure is significantly influenced by the presence of cracks. Cracks act as pathways that accelerate the ingress of corrosion agents into the concrete to the embedded reinforcement. This causes the acceleration of both the corrosion initiation and propagation stages of degradation. The increase in the corrosion rate in the corrosion propagation stage leads to a reduction in the residual service life of a structure. The overall effect of cracks in RC structures is that the residual service life of a structure is remarkably shortened. In recent years, many researchers have investigated the corrosion of structures in the propagation stage. However, the majority of these investigations are focused on specimens with only one crack and reinforcement rod. This study investigates cracked RC exposed to chloride-induced corrosion. The experimental investigation considers three different reinforcement layouts, namely 1Y10, 2Y10 and 3Y10, and four crack spacings (Sc), as follows: single crack, 70 ≤ Sc ≤ 85 mm, 85< Sc < 100mm ≤ 100 ≤ Sc ≤ 120 mm. Twenty-seven 150 x 150 x 700 mm long beams were sustained in flexural loading to maintain a consistent surface crack width of 0.4 ± 0.1 mm. The specimens were subjected to cyclic ponding for 36 weeks, and were monitored weekly to measure the corrosion rate and corrosion potential. The results indicate that the corrosion rate of the RC members is influenced by a change in reinforcement density. For a given crack spacing, the corrosion rate decreased with an increase in reinforcement density. In addition, the corrosion rates were influenced by different crack spacing. It was also observed that single cracked specimens were susceptible to a higher corrosion rate than the multiply cracked specimens. The combined effect of reinforcement density and crack spacing has shown that apart from a complex relationship between the anode and cathode region, the increase in reinforcement density has a greater in uence on the corrosion rate than the increase in crack spacing. In current practice, the onset of the corrosion propagation stage conservatively marks the end of the structure's serviceable life. A model for determining the residual service life of a structure in the corrosion propagation stage is proposed. This model may be used to gain insight regarding a structure's \corrosion state" for planning maintenance and determining its remaining service life. The study recommends that reinforcement density and crack spacing, accompanied by the prediction of residual service life, should be taken into consideration in the durability design of RC structures.

AFRIKAANSE OPSOMMING: Die duursaamheid van 'n gewapende beton (GB) struktuur word aansienlik beïnvloed deur die teenwoordigheid van krake. Krake dien as weë wat die indringing van roesmiddels in die beton na die bewapening versnel. Dit veroorsaak die versnelling van beide die korrosie-inisiasie en voortsettingsfases van verwering. Die toename in die korrosiesnelheid…

Advisors/Committee Members: Van Zijl, Gideon Pieter Adriaan Greeff, Stellenbosch University. Faculty of Engineering. Dept. of Civil Engineering..

Subjects/Keywords: Reinforced concrete  – Corrosion; Reinforced concrete  – Cracking; Corrosion rate; Reinforced concrete  – Testing; Stress corrosion; UCTD

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Bezuidenhout, S. R. (2017). Corrosion propagation in cracked reinforced concrete structures. (Thesis). Stellenbosch University. Retrieved from http://hdl.handle.net/10019.1/102853

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Bezuidenhout, Schalk Ruan. “Corrosion propagation in cracked reinforced concrete structures.” 2017. Thesis, Stellenbosch University. Accessed July 23, 2018. http://hdl.handle.net/10019.1/102853.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Bezuidenhout, Schalk Ruan. “Corrosion propagation in cracked reinforced concrete structures.” 2017. Web. 23 Jul 2018.

Vancouver:

Bezuidenhout SR. Corrosion propagation in cracked reinforced concrete structures. [Internet] [Thesis]. Stellenbosch University; 2017. [cited 2018 Jul 23]. Available from: http://hdl.handle.net/10019.1/102853.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Bezuidenhout SR. Corrosion propagation in cracked reinforced concrete structures. [Thesis]. Stellenbosch University; 2017. Available from: http://hdl.handle.net/10019.1/102853

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

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