ASTM C170 Compressive Strength of Dimension Stone

Get Certified ASTM C170 for Reliable Dimension Stone Performance 

Measuring compressive strength is essential to the safe structural integrity of exterior cladding, load-bearing walls, structural piers, and commercial stone flooring. Certified testing assures that natural stone batches comply with building code requirements and ASTM material specifications, including ASTM C503 for marble and ASTM C615 for granite, helping architects, structural engineers, and quarry operators avoid structural failure under service loads.

• Material Type: Natural dimension stone types, including granite, limestone, marble, sandstone, and slate.
• Purpose: Determination of ultimate compressive strength for structural design, material qualification, and quarry batch quality control.
• Property Measured: Uniaxial compressive strength, expressed in megapascals or pounds per square inch.
• Method: Apply uniaxial compressive loading via a calibrated testing machine equipped with a spherical seating block to square cubes or right circular cylinders.
• Result: Calculated compressive strength derived from peak load divided by the initial cross-sectional area of the specimen.
• Test Limitations: Applies strictly to natural dimension stone; artificial or cast stone products require different test standards.
• Environmental Conditions: Testing evaluates specimens in two distinct moisture states: dry (dried in an oven at 60 °C for 48 hours)  and wet (soaked in water at room temperature for 48 hours).
• Applications: Quality assurance, material specification compliance, structural load design, and cladding safety verification in civil construction and architectural projects.

What are the Uses of ASTM C170 Testing?

ASTM C170 testing enables structural engineers or material testing laboratories to measure the maximum load-carrying capacity of natural stone. The Standard –

• Determine precise ultimate compressive strength properties in both dry and wet environments.
• Test for anisotropy using load tests parallel and perpendicular to natural rift, bedding, or foliation planes.
• Compare the structural performance of various quarry ledges or stone types.
• Verify stone options for exterior columns, structural columns, and heavy-duty paving.
• Help with structural calculations for masonry wall design and anchor load distribution.

What Materials Can Be Tested Under ASTM C170? 

The standard test method tests natural stones like granite, marble, limestone, sandstone, and slate for compressive strength, which is essential for manufacturers and engineers to choose the correct stone for structural or decorative purposes.

Why is ASTM C170 Important? 

It is a very important test for the safety and durability of dimension stones in construction and architectural applications, as it provides a standardized method for measuring compressive strength.

ASTM C170 Testing Process and Data Collection

Technicians prepare cube or cylindrical specimens with a diameter or lateral dimension of at least 2 inches. For each test condition (dry and/or wet), technicians prepare at least five specimens. Technicians condition dry specimens for 48 hours at 140 ± 4°F. For wet specimens, technicians immerse the specimens in water for 48 ± 4 hours at 72°F. The technician places the specimen between the lower and upper compression plates and applies a compressive load at a rate of not more than 100 psi per second until the specimen fails. The technician measures the maximum load at failure and determines the compressive strength from the load and cross-sectional area. The laboratory then provides a detailed report. Technicians document the compressive strength, specimen size, conditioning, specimen identification, and testing conditions.

Common Challenges and Troubleshooting

Testing often faces improper sample preparation, machine misalignment, and inconsistent load application. To address these issues, follow precise specimen dimensions, ensure stone face parallelism, and calibrate equipment regularly.

• Compressive strength is the maximum pressure a stone sample can withstand before failure. A higher compressive strength value indicates greater load-bearing capacity and durability.
• The analysis accounts for the condition of the specimens. Moisture generally affects stone strength, and dry specimens typically show higher compressive strength values than wet specimens.
• Engineers can use the test results to compare the compressive strength of different dimension stone types. This information helps engineers compare stone types for particular applications.
• Compressive strength is a laboratory measurement expressed in MPa (SI units) or psi (inch-pound units). Users should consider the values expressed in either SI or inch-pound units as standard values and should not combine the two unit systems.
• The analysis also considers the specimen size and cross-sectional area. The analyst calculates compressive strength by dividing the maximum load at failure by the specimen’s cross-sectional area.
• The analyst documents the test conditions, conditioning regime, and failure-mode observations.
• When engineers perform a compressive strength test, they compare the results with product specifications, building codes, or design requirements. This comparison helps engineers determine the stone’s suitability for a particular application and ensure consistent product quality.

ASTM C170 provides a method for determining the compressive strength of dimension stone, such as granite, limestone, marble, and sandstone 

What equipment is used for ASTM C170? 

Technicians conduct the test with a compression testing machine that conforms to ASTM E4 practices, two compression plates, spherically seated compression plate fixtures, and data-acquisition software. The loading rate must not exceed 100 psi/second.

How are specimens conditioned for ASTM C170? 

Technicians condition dry specimens for 48 hours at 140 ± 4°F. For wet specimens, technicians immerse the specimens in water for 48 hours at 72 ± 4°F. Technicians should test a minimum of five specimens for each condition. 

Link to ASTM C170