ASTM C39 Compressive Strength of Cylindrical Concrete Specimens

The ASTM C39 test method is used to determine the compressive strength of cylindrical concrete specimens such as drilled cores and molded cylindrical specimens. It is only applicable to concrete with a density of more than 800 kg/m3.

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ASTM C39 Compressive Strength of Cylindrical Concrete Specimens

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Overview
Scope, Applications, and Benefits
Test Process
Specifications
Instrumentation
Results and Deliverables

Overview

ASTM C39 determines the compressive strength of cylindrical concrete specimens by applying axial load until failure. This test is one of the most important methods for evaluating the strength and quality of concrete used in construction.

It is widely used in construction, infrastructure, and civil engineering projects. The results help ensure that concrete meets design specifications and can safely withstand applied loads.

Scope, Applications, and Benefits

Scope

ASTM C39 evaluates the compressive strength of hardened concrete using standardized cylindrical specimens. The test measures the maximum load the specimen can withstand before failure.

The test evaluates:

Compressive strength of concrete
Load-bearing capacity of concrete structures
Quality and consistency of concrete mix
Performance under axial compression
Suitability for structural applications

Applications

Structural concrete in buildings and bridges
Pavements and road construction
Precast and cast-in-place concrete
Infrastructure and foundation projects
Quality control in concrete production
Civil engineering testing

Benefits

Provides accurate strength measurement of concrete
Ensures compliance with construction standards
Supports structural design and safety
Helps monitor concrete quality during production
Enables comparison of concrete mixes

Test Process

Sample Preparation

Cylindrical concrete specimens are cured and prepared to required dimensions.

Specimen Alignment

Samples are placed centrally in the compression testing machine.

Load Application

Axial load is applied at a controlled rate until failure occurs.

Data Recording & Evaluation

Maximum load is recorded to calculate compressive strength.

Technical Specifications

Parameter	Details
Applicable Materials	Concrete (cylindrical specimens)
Specimen Size	~150 mm × 300 mm (standard)
Strength Range	~10 MPa to 100 MPa
Loading Rate	~0.25 MPa/s to 0.35 MPa/s
Test Age	Typically 7, 14, or 28 days
Measured Outputs	Compressive strength (MPa)

Instrumentation Used for Testing

Compression testing machine
Load cell and control system
Specimen capping or grinding equipment
Alignment fixtures
Measuring tools
Data acquisition system

Results and Deliverables

Compressive strength values (MPa)
Failure load and mode
Concrete quality assessment
Comparative mix analysis
Test condition summary
ASTM compliance report

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Frequently Asked Questions

ASTM C39 includes compressive load, specimen diameter, height-to-diameter ratio, loading rate, curing conditions, and failure mode, evaluating compressive strength of cylindrical concrete specimens under controlled laboratory testing conditions.

ASTM C39 determines compressive strength, calculated from maximum load applied to the specimen, indicating structural capacity of concrete.

ASTM C39 is commonly applied to concrete cylinders prepared from fresh concrete used in construction and structural applications.

ASTM C39 requires a compression testing machine, loading platens, and specimen alignment devices to apply controlled compressive forces accurately.

ASTM C39 evaluates compressive strength under controlled laboratory conditions and may not fully represent in-situ concrete performance affected by curing, placement, and environmental conditions.