ISI has specified the full strength the full strength of concrete aft...
ISI has specified per 50 kg cement.
It has a gain of strength beyond 28 days.
The quantum of increase depends on the grade and type of cement curing and environmental conditions. The design should be based on 28 days characteristic strength of concrete unless there is evidence to justify a higher strength for is a piece of evidence to justify a higher strength for a particular due to age.
Hence the option D is correct.
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ISI has specified the full strength the full strength of concrete aft...
Full Strength of Concrete after 28 Days
Concrete is a widely used construction material due to its strength, durability, and low cost. The strength of concrete is a critical parameter that determines its load-bearing capacity and durability. The strength of concrete is typically measured in terms of its compressive strength, which is the amount of pressure that the concrete can withstand before it fails.
The compressive strength of concrete is influenced by several factors, including the type and amount of cement, the water-cement ratio, the type and amount of aggregate, and the curing conditions. The curing process is particularly important, as it allows the concrete to gain strength over time.
The American Concrete Institute (ACI) has specified the full strength of concrete after 28 days. This means that the compressive strength of concrete will continue to increase for up to 28 days after it has been poured, after which it will reach its full strength.
It is worth noting that the strength of concrete can vary depending on the specific mix design and the curing conditions. For this reason, it is important to test the compressive strength of concrete samples at various intervals to ensure that the concrete has reached the desired strength.
Conclusion
In summary, the full strength of concrete is typically specified after 28 days, although the strength can continue to increase beyond this point. The compressive strength of concrete is influenced by several factors, including the mix design and the curing conditions. It is important to test the strength of concrete samples at various intervals to ensure that the concrete has reached the desired strength.