Modulus of Elasticity of Concrete
(Static Elastic Modulus)

Laboratory measurement of the static modulus of elasticity (Young's Modulus) of hardened concrete — an essential structural property for deflection calculation, prestress loss estimation and dynamic analysis.

Overview

What is the Modulus of Elasticity of Concrete?

The Static Modulus of Elasticity of concrete is the ratio of applied stress to resulting strain in the elastic range. It is measured by applying incremental compressive loads to a cylindrical concrete specimen while simultaneously measuring longitudinal strain using compressometers or strain gauges, and plotting the stress-strain curve.

Conducted as per IS 516 and ASTM C469, the modulus of elasticity is a critical input for structural design calculations — particularly for deflection of beams and slabs, prestress loss in post-tensioned structures, creep and shrinkage analysis and dynamic response calculations. Global Lab uses NABL-calibrated compressometers and extensometers for precise strain measurement.

Critical Structural Parameter

E-value directly used in deflection, prestress loss and dynamic analysis.

Chord Modulus Method

Calculated as chord modulus between 50 μstrain and 40% of compressive strength per ASTM C469.

Simultaneous Strength Test

Elastic modulus and compressive strength determined from same specimen.

Strain Gauge Option

Electrical strain gauges used for high-precision E-value measurement.

NABL Certified Reports

All results on NABL-accredited letterhead per IS 516 / ASTM C469.

All Concrete Grades

Normal, HPC and SCC mixes tested from M20 to M100.

Test in Action

Modulus of Elasticity of Concrete — Site Images

Compressometer Attached to Concrete Cylinder

Incremental Loading in CTM

Stress-Strain Curve Plotted in Laboratory

Test Procedure

How the Modulus of Elasticity of Concrete is Conducted

1

Specimen Preparation

150×300mm cylinders are cast or cored. Ends are ground flat and parallel. Length/diameter ratio of 2:1 confirmed.
2

Compressometer/Gauge Attachment

Compressometer or electrical strain gauges are attached to the mid-third of the cylinder to measure longitudinal strain.
3

Pre-Loading Cycles

Two pre-conditioning load cycles to 40% of compressive strength are applied to seat the specimen and gauges.
4

E-Value Loading

Load is applied in increments. Stress and strain are recorded at each increment up to 40% of compressive strength.
5

Modulus Calculation & Reporting

Chord modulus E = (S2-S1)/(ε2-0.00005) calculated per ASTM C469. Stress-strain curve plotted. NABL report issued.

Standards & Specifications

Applicable Test Standards

Standard	Title	Scope	Type
IS 516	Methods of Tests for Strength of Concrete	Concrete Testing	Indian Standard
ASTM C469	Standard Test Method for Static Modulus of Elasticity and Poisson's Ratio of Concrete in Compression	Elastic Modulus	ASTM
BS EN 12390-13	Testing Hardened Concrete — Determination of Secant Modulus of Elasticity in Compression	Modulus	British Standard
IS 1343	Code of Practice for Prestressed Concrete	Prestress Design	Indian Standard

Applications

Where is the CAPO Test Used?

Prestressed concrete design — calculating prestress losses due to elastic shortening

Structural deflection calculations for long-span beams and flat slabs

Dynamic analysis of structures subject to seismic or machine vibration loads

Validation of concrete mix designs for stiffness-critical applications

Creep and shrinkage analysis for tall buildings and long-span bridges

Input parameter for finite element analysis of complex concrete structures

Why Choose Global Lab

Our Advantages

NABL Accredited ReportsLegally valid E-value certificates for all structural design purposes.

Compressometer and Strain Gauge OptionsBoth mechanical and electrical measurement methods available.

Combined with Compressive StrengthModulus and strength determined simultaneously from same specimen.

Autovity Digital ReportsStress-strain curves and E-value data accessible digitally.

Structural Engineering ExpertiseResults interpreted with design implications by our structural engineers.

All Concrete GradesNormal to ultra-high strength concrete modulus testing capability.

Modulus of Elasticity of Concrete(Static Elastic Modulus)