Prediction of Later-Age Concrete Compressive Strength Using Feedforward Neural Network

Table 1

Summary of the empirical equations for determining the compressive strength of concrete.

Ref.	Equation	Symbol	Time-dependent
Abrams’ law		S: compressive strength; A, B: constant; W/C: water/cement ratio	No
Hasan and Kabir [8]		p, q: constant; n: day; Dn: number of days	Yes
ACI 209-71 [13]		a, b: constant; t: number of days; S28d: compressive strength at 28 days	Yes