#1 Concrete Crushing Strain Test | Material Testing Lab Near me

Concrete Crushing Strain in Compression
(Ultimate Compressive Strain — IS 456)

Measurement of ultimate compressive strain of concrete at crushing — providing the strain capacity parameter for IS 456 and ACI 318 ductility-based structural design of columns and beams.

Overview

What is the Concrete Crushing Strain in Compression?

The Concrete Crushing Strain Test measures the compressive strain in concrete at the point of crushing failure. IS 456 assumes a limiting compressive strain of 0.0035 for design, but actual values depend on concrete grade, aggregate type, confinement and loading rate — critical data for HPC ductility assessment.

Conducted per IS 516 and ASTM C469 using electrical strain gauges and servo-controlled loading, the complete stress-strain curve with ultimate strain is essential for non-linear structural analysis of HPC columns, seismic design and performance-based design.

Complete Stress-Strain Curve

Full ascending and descending branch captured using servo-controlled loading.

Ultimate Strain Measurement

Actual εcu measured vs IS 456 assumed 0.0035 — critical for HPC.

Servo-Controlled CTM

Closed-loop control maintains stable loading through post-peak regime.

Confined Concrete Option

Laterally confined specimens test effectiveness of transverse reinforcement.

NABL Certified Reports

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

Non-Linear Analysis Input

Complete stress-strain model parameters provided for FEA.

Test in Action

Concrete Crushing Strain in Compression — Site Images

Strain Gauges Bonded at Mid-Height of Cylinder

Servo-Controlled Loading to Post-Peak

Complete Stress-Strain Curve Including Descending Branch

Test Procedure

How the Concrete Crushing Strain in Compression is Conducted

1

Specimen Preparation

150×300mm cylinders prepared. Ends ground flat. Strain gauges bonded at mid-height.
2

Servo CTM Setup

Closed-loop servo CTM set up with stroke control for stable post-peak testing.
3

Strain Gauge & Compressometer

Electrical strain gauges and compressometer calibrated and attached.
4

Monotonic Compression to Failure

Strain-controlled loading applied until crushing. Load, stress and strain recorded continuously.
5

Ultimate Strain & Model

εcu at crushing identified. Mander or Popovics stress-strain model fitted. NABL report within 35 days.

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	Modulus & Strain	ASTM
IS 456:2000	Plain and Reinforced Concrete — Code of Practice	Design Reference	Indian Standard
ACI 318	Building Code Requirements for Structural Concrete	Design Code	ACI

Applications

Where is the CAPO Test Used?

HPC column design verification — actual εcu vs IS 456 assumed 0.0035

Seismic design of confined RC columns per IS 13920 ductility requirements

Non-linear pushover analysis input — complete stress-strain curve required

UHPC material characterisation for bridge girder and structural applications

Research on confinement effectiveness of FRP wrapping on concrete columns

Performance-based earthquake engineering — concrete material model validation

Why Choose Global Lab

Our Advantages

NABL Accredited ReportsLegally valid ultimate strain and stress-strain curve data.

Servo-Controlled Post-PeakStable post-peak testing captures descending branch for ductility assessment.

Stress-Strain Model FittingMander, Popovics and Sargin models fitted and reported alongside raw data.

Seismic Design ExpertiseExperienced in ductility and confinement testing for IS 13920 compliance.

Pan-India CoverageTesting at all 7 NABL-accredited lab locations.

Combined Mechanical Packageεcu + Elastic modulus + Compressive strength in single test series.

Concrete Crushing Strain in Compression(Ultimate Compressive Strain — IS 456)