Curve #

Reference

Material type

Coefficients

A

B

C

1

Harison (1989) [10]

All − DN > 10

2.560

1.160

363

2

Harison (1989) [10]

All − DN < 10

2.540

1.120

347

3

Webster et al. (1992) [11]

All except CL and CH

2.465

1.120

292

4

Ese et al. (1994) [12]

All

2.438

1.065

274

5

Webster et al. (1994) [13]

CH only

2.542

1.000

358

6

Webster et al. (1994) [13]

CL with CBR < 10%

3.538

2.000

3452

7

Smith & Pratt (1983) [14]

All

2.620

1.270

417

8

Kleyn & v Heerden (1983) [7]

All

2.560

1.150

363

9

Seyman (2003) [15]

All

2.256

0.954

180

10

Nazzal (2002) [16]

All

*

11

Phillips (2005) [17]

All

*

12

Livneh et al. (1999) [18]

All

2.200

0.710

*