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Table 12 Models for prediction of compressive strength after confinement.

From: The Effect of Rebar Embedment and CFRP Confinement on the Compressive Strength of Low-Strength Concrete

Model

Compressive strength after confinement (MPa)

ACI 440-2R (ACI440.2R-08, 2008)

f′cc = f'co + 3.3Ψ кa ft

ft = \(\frac{2 Ef n tf \varepsilon fe}{D}\)

εfe = кε εfu

Lam and Teng (Pham & Hadi, 2014b)

\(\frac{f^{\prime}cc}{{f^{\prime}co}} = 1 + 3.3 \frac{fl}{{f^{\prime}co}}\)

\(fl = \frac{{2 E{\text{f}} \varepsilon fe t}}{D}\)

Ali fallahpour et al. (Wu & Zhou, 2010)

f′cc = f′co + k1klεfu

k1 = 2.5- 0.01f′co

\(k_{1} = \frac{2 Ef tf}{D}\)

Richart et al. (Pour et al., 2018)

f′cc = f′co + k1fr

fr = \(\frac{2fj tj}{D}\)