Concrete · Normal-weight concrete · isotropic

C45/55

Name: C45/55 — material properties (EN 1992-1-1)
Creator: BadgerMecX

EN 1992-1-1 · 28 days

C45/55 is a normal-weight concrete strength class to EN 1992-1-1. Its characteristic characteristic cylinder strength is 45 MPa. E = 36 GPa, ν = 0.2 and α = 10 × 10⁻⁶/K (mean values).

Record: concrete-c45-55
Library: v1.1.0
Properties: 19
Sources: 2
Build check: passed ✓
Viewing as: guest

E · Young's modulus 36GPa mean^[1]

ν · Poisson's ratio 0.2– design^[1]

f_ck · Characteristic cylinder strength 45MPa char^[1]

f_ctm · Mean tensile strength 3.8MPa mean^[1]

ρ · Density 2447kg/m³ derived^[2]

α · Coefficient of thermal expansion 1010⁻⁶/K design^[1]

Elastic constants

isotropic

Symbol	Property	Value	Unit	Basis	Ref.
E	Young's modulus ⓘ E_cm, secant modulus between 0 and 0.4·f_cm	36	GPa	mean	[1]
ν	Poisson's ratio ⓘ uncracked; 0 for cracked concrete (3.1.3(4))	0.2	–	design	[1]
G	Shear modulus ⓘ G = E_cm/(2(1 + ν)) with ν = 0.2	15	GPa	derived	[1]
K	Bulk modulus K = E / 3(1 − 2ν)	20	GPa	derived	—
λ_L	Lamé constant λ_L = Eν / (1 + ν)(1 − 2ν)	10	GPa	derived	—
c₀	Bar wave speed c₀ = √(E/ρ)	3835	m/s	derived	—

Physical, thermal and electrical

at 20 °C

Symbol	Property	Value	Unit	Basis	Ref.
α	Coefficient of thermal expansion ⓘ 3.1.3(5)	10	10⁻⁶/K	design	[1]
γ	Weight density ⓘ plain normal-weight concrete; +1 kN/m³ for normal reinforcement, +1 kN/m³ while wet	24	kN/m³	nominal	[2]
ρ	Density ⓘ γ/g for plain concrete (24 kN/m³ ÷ 9.80665 m/s²)	2447	kg/m³	derived	[2]

Strength

a band applies up to and including its upper limit

Symbol	Property	Value	Unit	Basis	Ref.
f_ck	Characteristic cylinder strength	45	MPa	char	[1]
f_ck,cube	Characteristic cube strength	55	MPa	char	[1]
f_cm	Mean cylinder strength	53	MPa	mean	[1]
f_ctm	Mean tensile strength	3.8	MPa	mean	[1]
f_ctk,0.05	Tensile strength, 5 % fractile	2.7	MPa	char	[1]
f_ctk,0.95	Tensile strength, 95 % fractile	4.9	MPa	char	[1]
ε_c1	Strain at peak stress	2.4	‰	design	[1]
ε_cu1	Ultimate strain	3.5	‰	design	[1]
ε_c2	Strain at peak, parabola–rectangle	2	‰	design	[1]
ε_cu2	Ultimate strain, parabola–rectangle	3.5	‰	design	[1]
n	Exponent, parabola–rectangle	2	–	design	[1]
ε_c3	Strain at peak, bilinear	1.75	‰	design	[1]
ε_cu3	Ultimate strain, bilinear	3.5	‰	design	[1]

Notes

Strains in the record are dimensionless (EN 1992-1-1 tabulates them in ‰).

Sources

every value names one

EN 1992-1-1:2004, Eurocode 2 — Design of concrete structures, Table 3.1, 3.1.3, 3.2.7 and Annex CCopies checked: 1, 2, 3
EN 1991-1-1:2002, Eurocode 1 — Densities, self-weight, Table A.1Copies checked: 1, 2

min product standard minimum char characteristic design code value for design typical datasheet or textbook derived worked out here, formula shown

Cite this page

for reports and papers

BadgerMecX Materials (2026). C45/55 — material properties, EN 1992-1-1. Library v1.1.0, record concrete-c45-55. https://badgermecx.com/materials/concrete-c45-55/ (accessed 2026-10-08).

@misc{badgermecx_concretec4555,
  title  = {C45/55 -- material properties, EN 1992-1-1},
  author = {{BadgerMecX Materials}},
  year   = {2026},
  note   = {Library v1.1.0, record concrete-c45-55},
  url    = {https://badgermecx.com/materials/concrete-c45-55/}
}

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