C50/60 vs C60/75

C60/75 and C50/60 are about equally stiff. Their densities are about the same. Per unit mass they are about equally stiff (15.12 and 15.94 MJ/kg). Strength: f_ck = 50 MPa for C50/60, f_ck = 60 MPa for C60/75.

C50/60 EN 1992-1-1 C60/75 EN 1992-1-1

Side by side

ratio = C60/75 / C50/60 · log scale

Property	C50/60	C60/75	Unit	Ratio
E Young's modulus	37	39	GPa	1.05×
G Shear modulus	15.42	16.25	GPa	1.05×
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	50	60	MPa	1.2×
f_ck,cube Characteristic cube strength	60	75	MPa	1.25×
f_cm Mean cylinder strength	58	68	MPa	1.17×
f_ctm Mean tensile strength	4.1	4.4	MPa	1.07×
f_ctk,0.05 Tensile strength, 5 % fractile	2.9	3.1	MPa	1.07×
f_ctk,0.95 Tensile strength, 95 % fractile	5.3	5.7	MPa	1.08×
ε_c1 Strain at peak stress	2.45	2.6	‰	1.06×
ε_cu1 Ultimate strain	3.5	3	‰	0.857×
ε_c2 Strain at peak, parabola–rectangle	2	2.3	‰	1.15×
ε_cu2 Ultimate strain, parabola–rectangle	3.5	2.9	‰	0.829×
n Exponent, parabola–rectangle	2	1.6	–	0.8×
ε_c3 Strain at peak, bilinear	1.75	1.9	‰	1.09×
ε_cu3 Ultimate strain, bilinear	3.5	2.9	‰	0.829×
E/ρ Specific stiffness E/ρ · derived	15.12	15.94	MJ/kg	1.05×
c₀ Bar wave speed √(E/ρ) · derived	3888	3992	m/s	1.03×
f/ρ Specific strength f/ρ · derived	20.43	24.52	kJ/kg	1.2×

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.