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Table 4 Values of parameters A, B, and C for different specimens.

From: Influence of Initial Damage Degree on the Degradation of Concrete Under Sulfate Attack and Wetting–Drying Cycles

No.

Sulfate attack cycle

Ascending part

Descending part

R2

A

B

C

D0

0

1.06079

9.16004

1.5301 × 10−4

0.99614

30

1.11849

11461.54331

3.37141 × 10−4

0.96945

60

1.06155

16881.23242

2.44691 × 10−4

0.98164

90

0.99882

5531.2157

8.96821 × 10−4

0.98984

120

1.06162

2.92818

0.67443

0.99318

150

1.05181

18.95907

0.19027

0.98923

D1

0

1.02388

10015.11305

1.96487 × 10−4

0.94518

30

1.02564

998.55018

0.00344

0.98978

60

1.02924

1747.3587

9.09073 × 10−4

0.97958

90

1.03073

0.08231

2.58364

0.97481

120

0.99689

2.68003

0.67824

0.99554

150

1.09075

0.68268

1.75409

0.97404

D2

0

1.01727

1870.47901

0.00139

0.97907

30

1.04629

2365.67288

7.95432 × 10−4

0.93595

60

1.10379

1.43515

1.12604

0.99511

90

1.21406

1.45175

1.04073

0.98921

120

1.19766

0.29678

1.84488

0.99158

150

1.12493

5.14750

0.36012

0.99323

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