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Civil Engineering/Concrete Setting and Strength Gain Rates
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Question
WHAT IS INITIAL & FINAL SETTING TIME OF CONCRETE OF PARTICULAR GRADE OF CONCRETE THAT IS M20,M15,M30. & WHAT IS LIMIT OF PERCENTAGE OF COMPRESSIVE STRENGTH OF CONCRETE GETTING AFTER 7DAYS, 28 DAYS, 3 MONTH, 6 MONTH , 1YEAR FOR ANY GRADE OF CONCRETE?
Hi Ibrahim,
This depends on a lot of variables such as temperature, humidity, cement content, water/cement ratio, additives, etc. The initial setting time can vary from an hour to a few hours. As for the strength gain rates, again this depends on various factors as above, plus method of curing, but you can estimate 7 days strength as about 65-75% of 28 days strength.
The strength gain after 28 days also depends on several factors, including method and length of curing, ambient conditions, mix design, ingredients (additives), etc. In general, you can count on additional strength gain of between 5-15% of the specified 28-day strength over a period of several months. See the Q&A below, which gives some more details:
http://uk.answers.yahoo.com/question/index?qid=20090222081430AARqmGR
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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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