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Question
QUESTION: please let me know the reasons of carbonation in Reinforced Cement Concrete
ANSWER: Hi Bhupinder,
Carbonation in concrete is the slow process of carbon dioxide penetrating the concrete cover of RC structures untill it reaches the embeded rebar and that starts corrsion- see the website below for details:
www.testconsult.co.uk/downloads/st_data05_carb.pdf
Hope that helps!
Kind regards,
Arshad
---------- FOLLOW-UP ----------
QUESTION: Thanks for reply, further I want to know the following 1. What are the source of carbon dioxide which penetrate the cover concrete of RCC? 2. In Delhi, if a top floor flat of four story apartment having mud phaska treatment on terrace, remains unattended for more than 10 years,due to rain,pollution,growing of vegetation, overflowing of overhead tanks (of drinking water which is treated with chloride) (i) is carbonation is possible? (ii) what are the defects can be occurred in this flat? 3. Whether carbonation in RCC is due to execution or due to poor maintenance?
Hi Bupinder,
The main source of carbonation is exposure to the atmosphere and then with the additional presence of moisture and air this leads to corrosion of the rebar.
Your example of the roof is one where you can easily get carbonation and corrosion of the rebar.
Hope that helps!
Kind regards,
Arshad
Answers by Expert:
Arshad Khan
Expertise
I can answer any questions to do with civil and structural engineering consultancy and construction industry in East Africa and the Middle East, and specifically with the analysis and design of reinforced concrete structures. My particular expertise is in the aseismic design and optimisation of tall buildings.
Experience
Employment history: 36 years in Construction and consultancy in the UK, Kenya, Tanzania, Uganda, Ethiopia, Eritrea, South Africa, Somalia, Zambia, Austria, Bahrain, Kuwait, Doha and the U.A.E.
Organizations
.Fellow of Institution of Structural Engineers (UK)
.Fellow of Institution of Civil Engineers(UK)
.Member of the Institution of Engineers, Kenya
.Registered Engineer, ERB, Kenya
.Member of the Architectural Association of Kenya (Engineers Chapter)
.Chartered Engineer (UK)
Publications
•1984: International Conference on the Art and Practice of Structural Design, London
•1994: 3rd Int. Kerensky Conference in Structural Engineering, Singapore
•2008: International Conference on High-Rise Towers, Abu Dhabi
Education/Credentials
BSc, 1st Class Hons, in Building Engineering, University of Bath, UK
MSc in Concrete Structures and Technology, University of London.
Diploma of Imperial College, UK.
Awards and Honors
•Science Congress Special Award (for 2-seater Hovercraft - 1968)
•Institution of Civil Engineers Award for outstanding performance at Bath University (1975)
•Concrete Society Postgraduate study Bursary Award (1976)
•Consular Representative for British High Commission, Nairobi. (1995 to 1998)
•Examiner for Institution of Civil Engineers Professional Interviews, Nairobi. (1997 to 1998)
•Branch Representative in Vienna for PI assessment for Inst. of Struct. Engrs. (1999 to date)
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