C55/67 vs C90/105

C90/105 is 1.2 times as stiff as C55/67. Their densities are about the same. Per unit mass C90/105 is 1.2 times as stiff. Strength: f_ck = 55 MPa for C55/67, f_ck = 90 MPa for C90/105.

C55/67 EN 1992-1-1 C90/105 EN 1992-1-1

Side by side

ratio = C90/105 / C55/67 · log scale

Property	C55/67	C90/105	Unit	Ratio
E Young's modulus	38	44	GPa	1.16×
G Shear modulus	15.83	18.33	GPa	1.16×
ν Poisson's ratio	0.2	0.2	–	1×
ρ Density	2447	2447	kg/m³	1×
γ Weight density	24	24	kN/m³	1×
α Coefficient of thermal expansion	10	10	10⁻⁶/K	1×
f_ck Characteristic cylinder strength	55	90	MPa	1.64×
f_ck,cube Characteristic cube strength	67	105	MPa	1.57×
f_cm Mean cylinder strength	63	98	MPa	1.56×
f_ctm Mean tensile strength	4.2	5	MPa	1.19×
f_ctk,0.05 Tensile strength, 5 % fractile	3	3.5	MPa	1.17×
f_ctk,0.95 Tensile strength, 95 % fractile	5.5	6.6	MPa	1.2×
ε_c1 Strain at peak stress	2.5	2.8	‰	1.12×
ε_cu1 Ultimate strain	3.2	2.8	‰	0.875×
ε_c2 Strain at peak, parabola–rectangle	2.2	2.6	‰	1.18×
ε_cu2 Ultimate strain, parabola–rectangle	3.1	2.6	‰	0.839×
n Exponent, parabola–rectangle	1.75	1.4	–	0.8×
ε_c3 Strain at peak, bilinear	1.8	2.3	‰	1.28×
ε_cu3 Ultimate strain, bilinear	3.1	2.6	‰	0.839×
E/ρ Specific stiffness E/ρ · derived	15.53	17.98	MJ/kg	1.16×
c₀ Bar wave speed √(E/ρ) · derived	3940	4240	m/s	1.08×
f/ρ Specific strength f/ρ · derived	22.47	36.78	kJ/kg	1.64×

Values at the first thickness band or product form of each material (EN 1992-1-1; EN 1992-1-1). A minimum and a characteristic value are not the same kind of number — read the ratio as a guide. Each material's page lists every band and every source.