Civil Engineering - Concrete Technology - Discussion

Maturity =summation of (time x temperature).
Hydration of concrete continue to takes place up to -11 degree Celsius.

Therefore, -11deg celsius is taken as a datum temperature for computing maturity.
That means hydration calculated with respect to -11deg Celcius.

@Nikku.

How did this come out? Explain please.

Thanks @Aniket.

(11°F-32)*5/9 = -11.67°C.

Thanks @Aniket.

Plowman (1958) proposed a single strength-maturity equation based on past studies performed by various authors, with various mixtures, water-to-cement ratios, and curing temperatures between 11°F and 105°F (-12°C to 41°C). Using the logarithmic strength-maturity function, he proposed that the constants, a and b have specific values based on four strength ranges up to 10,000 psi. With this equation, Plowman found that any concrete strength could be estimated based on a given maturity, regardless of water-to-cement ratio, the curing temperature under 100°F, or aggregate-to-cement ratio, with an average error of 3%. Plowman's equation seemed to be valid, although his equation was only based on 26 different compressive strength values.

Please explain this answer.

Please explain it.