ρ	density, [kg/m3]
ρa	bulk density of coarse aggregate, [kg/m3]
d max	maximum size of a certain fraction’s particle, [mm]
a	absorptivity, [%]
p	total porosity, [%]
Rm	tensile strength of steel fibres, [MPa]
AR	aspect ratio, [-]
L	length of particle, [mm]
W	width of particle, [mm]
R	roundness, [-]
l	perimeter in a 2-dimensional projection, [mm]
A	area in a 2-dimensional projection, [mm2]
A r	area ratio, [-]
A ce	ratio of area of a circumscribing ellipse, [mm2]
A 1	area of particle, [mm2]
${\overline{R}}_{c3}$, ${\overline{R}}_{c7}$, ${\overline{R}}_{c28}$	average compressive strength at 3, 7, 28 days, [MPa]
E	modulus of elasticity, [GPa]
${\overline{E}}_3$, ${\overline{E}}_7$, ${\overline{E}}_{28}$	average Young modulus at 3, 7, 28 days, [GPa]
R c	nominal compressive strength, [MPa]
s	standard deviation, [-]
c V	coefficient of variation, [%]
$\epsilon$	axial strain during fracture, [‰]
${\epsilon }_T$	transverse strain during fracture, [‰]