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How long does hydration continue?

Article based on contribution by: Mr Manoj Tewari , MPPWD

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The hydration process is faster in initial period and continues indefinitely at a decreasing rate.

Even after a long time there remains an appreciable amount of unhydrated cement. For instance, after 28 days of initial contact with water, grains of cement have been found to hydrated to a depth of just 4µm-8µm after a year.
Powers calculated that complete hydration under normal conditions is possible only for cement particles smaller than 50µm. However,full hydration has been obtained by grinding cement in water continuously for five days.




Indian Guide to Quality Concrete: the Dream CD for every Civil Engineer: Click Here to know more

Indian Guide to Quality Concrete
contains
All the Quality Parameters that a Civil Engineer needs to know for making
The Quality Concrete
 including:-
Material Specifications: for Cement, Aggregate, Water, Admixture & Reinforcement
Material Storage: for Cement, Aggregate & Reinforcement
Concrete Mix Design: based on IS 10262 & SP 23
Concreting Process: Batching, Mixing, Formwork, Placing, Vibrating & Curing, Extreme Weather Concreting, Under-Water Concreting
Reinforcement: Placing, Binding, Schedules & Detailing
Tests: for Cement, Aggregate, Admixture & Concrete (Destructive & Non Destructive)
Limit State Design: based on IS 456:2000
General Construction for Dams & other massive structures: based on IS 457(reaffirmed 2005)
Shotcrete, Silica Fumes, Water proofing &  others......
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