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Civil Engineering/expansion joint provision for large water retaining structure

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Expert: - 4/17/2010


Question
"if the walls and slabs are designed properly for early-age shrinkage cracking, then you do not need any joints in these."

What is the design provision for early age shrinkage cracking?

Thanks.

Answer
Jonathan,

Basically this design takes account of the prevailing weather conditions, the shape/size/support conditions of the structure (i.e. what restraint there is to shrinkage, the concrete mix & compaction, the curing methods and the quantity and distribution of rebar. This will give you further details:

http://www.concrete.net.au/publications/pdf/Early_Age.pdf

http://www.concrete.org/pubs/newpubs/231R-10web.pdf

www.bcrc.com.au/...Crack.../CrackControlPapers/2008-10-NZ-Control-of-contraction-induced-cracking.aspx

The last one is particularly detailed.  

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Arshad Khan

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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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