C35/45 vs C55/67

C55/67 is 1.1 times as stiff as C35/45. Their densities are about the same. Per unit mass C55/67 is 1.1 times as stiff. Strength: f_ck = 35 MPa for C35/45, f_ck = 55 MPa for C55/67.

C35/45 EN 1992-1-1 C55/67 EN 1992-1-1

Side by side

ratio = C55/67 / C35/45 · log scale

Property	C35/45	C55/67	Unit	Ratio
E Young's modulus	34	38	GPa	1.12×
G Shear modulus	14.17	15.83	GPa	1.12×
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	35	55	MPa	1.57×
f_ck,cube Characteristic cube strength	45	67	MPa	1.49×
f_cm Mean cylinder strength	43	63	MPa	1.47×
f_ctm Mean tensile strength	3.2	4.2	MPa	1.31×
f_ctk,0.05 Tensile strength, 5 % fractile	2.2	3	MPa	1.36×
f_ctk,0.95 Tensile strength, 95 % fractile	4.2	5.5	MPa	1.31×
ε_c1 Strain at peak stress	2.25	2.5	‰	1.11×
ε_cu1 Ultimate strain	3.5	3.2	‰	0.914×
ε_c2 Strain at peak, parabola–rectangle	2	2.2	‰	1.1×
ε_cu2 Ultimate strain, parabola–rectangle	3.5	3.1	‰	0.886×
n Exponent, parabola–rectangle	2	1.75	–	0.875×
ε_c3 Strain at peak, bilinear	1.75	1.8	‰	1.03×
ε_cu3 Ultimate strain, bilinear	3.5	3.1	‰	0.886×
E/ρ Specific stiffness E/ρ · derived	13.89	15.53	MJ/kg	1.12×
c₀ Bar wave speed √(E/ρ) · derived	3727	3940	m/s	1.06×
f/ρ Specific strength f/ρ · derived	14.3	22.47	kJ/kg	1.57×

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.