Table 1 Properties of the materials

Porosimetry (mercury intrusion porosimetry)

 Average pore radius (µm)

7.9

34.6

 Total porosity (%)

17.2

35.1

Hygric swelling at 95% RH ɛ ₉₅ (mm m⁻¹)

0.43

0.49

Hydric swelling ɛ _s (mm m⁻¹)

1.25

5.02

Thermal expansion α (10⁻⁶ K⁻¹)

12.9

32.7

Poisson’s ratio ν (−)

0.2^a

0.4^b

Elastic modulus E (GPa)

 Wet

0.43

–

 Dry

1.87

2.03

Relaxation modulus

 Dry

–

\( E_{0} { \exp }\left( { - ( t/\tau)^{\beta } } \right)^{\text{c}}\)

Tensile strength (MPa)

 Wet

0.3

–

 Dry

1.0

2.7