ASTM C67 Standard Test Methods for Sampling and Testing Brick and Structural Clay Tile

    ASTM C67 Introduction

    ASTM C67 (Standard Test Methods for Sampling and Testing Brick and Structural Clay Tile) includes tests for brick and structural clay tile for physical and mechanical properties. ASTM C67 tests masonry products for properties like strength, durability, moisture resistance, and dimensional stability. The standard is used for construction applications for quality control, product certification, and material comparison. ASTM C67 applies to clay brick, structural clay tile, solid masonry units, and other fired ceramic building materials for residential, commercial, and industrial construction.

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    Get Certified ASTM C67 Testing for Reliable Masonry Performance

    Certification guarantees the product quality and durability of brick and clay tile before use in construction. Certified testing enhances structural reliability and moisture resistance, improving long-term masonry performance.

    Scope of ASTM C67 Test Standard

    • Measures the characteristics of brick and structural clay tile. 
    • Measures the compressive strength and water absorption.
    • Evaluates the freeze-thaw durability and efflorescence of materials. 
    • Assists in quality control and certification of masonry work. 
    • Applies to fired clay masonry products. 

    ASTM C67 Equipment and Sample Preparation

    Specimen DetailsTechnicians test brick and structural clay tile units used in masonry construction. These samples include fired clay bricks, hollow clay tiles, solid clay tiles, etc., of masonry. Samples are to be representative of production batches and free of any visible cracking, chipping, laminations, or surface defects that significantly impact strength, absorption, or durability results. 
    Specimen PreparationThe operator selects typical units from the lot and cleans them to remove dust and other particles from the surface without altering the surface condition. They can cut or cap specimens for strength testing. They also dry or soak them before testing, as required by the test. 
    Specimen DimensionsThe laboratory tests full-size masonry units whenever possible. Operators divide units into standard test specimens as needed, with the understanding that the geometry of the specimens is representative of the unit being tested and that the loading surfaces are uniform, enabling accurate measurement of compressive and flexural strength. 

    Use of ASTM C67

    • Determines the strength and the good or bad of masonry units. 
    • Assists in choosing construction materials. 
    • Helps confirm moisture-resistance properties. 
    • Helps in quality control and product certification. 

    Why is water absorption important?

    The water absorption property influences the durability and weather resistance of masonry units. High absorption leads to greater moisture uptake, which will affect long-term structural performance.

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    Why is freeze-thaw resistance critical?

    Freeze-thaw resistance is essential because the water that enters brick or clay tile can freeze and expand, leading to cracking, spalling, and structural damage. ASTM C67 tests the resistance of a material to repeated freezing and thawing without damage. Masonry units with good freeze-thaw resistance will have long life and good performance in cold climates. 

    Common Challenges and Troubleshooting 

    Technicians have problems with specimen selection, moisture conditioning, dimensional measurements, and/or contamination. These challenges affect test accuracy. However, the process of sample preparation, calibration of equipment, and control of laboratory conditions enhances the repeatability and reliability of testing.

    ASTM C67 Testing Technique, Process, and Data Collection

    Technicians take masonry samples representative of the production lot. They then clean and condition the specimens before testing. Compressive strength, absorption, efflorescence, and freeze-thaw tests are conducted in the laboratory. Technicians also take measurements for dimensions, warpage, and void areas. Lastly, inspectors capture and examine all test data for compliance.

    Testing Procedures and Requirements

    First, the technician takes samples of the brick and/or clay tile production lot for analysis. Then, they wash the specimens and clean the materials before testing. Next, they wash the samples. Remove contamination and clean materials before testing. The technicians then conduct tests for the following: compressive strength, absorption, efflorescence, dimensional change, and freezing-thawing. Lastly, the inspectors record and analyze the test results.

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    Dimensional MeasurementThe operators use calibrated calipers or steel rules to measure the length, width, and height of each unit. They measure dimensions precisely to work out the cross-sectional area for strength assessments. 
    Flexural Strength (Modulus of Rupture) In units tested in bending, the operator holds the sample at predetermined spans and loads it at the center or third points. They measure the failure load and determine the MOE. 
    The image shows a compression testing machine that measures compressive strength and modulus of rupture during ASTM C67 testing.
    ASTM C67 Compression Testing Machine

    Analysis Results and Interpretation

    ASTM C67 reports compressive strength in megapascals (MPa) or pounds per square inch (psi). The standard provides water absorption and saturation coefficient data in percentage form (%), and dimensional data in millimeters (mm) or inches (in.). High compressive strength values indicate the high quality and durability of masonry units. The lower the absorption, the higher the weather durability and the better the moisture resistance. 

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    Direct Link to ASTM C67

    FAQ

    Where can I get the astm c67 tested?
    You can share your astm c67 testing requirements with MaTestLab. MaTestLab has a vast network of material testing laboratories, spread across the USA and Canada. We support your all material testing needs ranging from specific astm c67 test to various testing techniques.
    Please contact us for a detailed quote for your astm c67 testing needs. Cost incurred to carry out different astm c67 testing methodology depends on the type of raw material; number of samples, coupons, or specimens; test conditions, turn around time etc. Costs of some ASTM testing methods start from $100 and the final value depends upon the factors listed above. Please contact us for the best and latest prices.
    The required number of samples or specimens should comply with the procedure given in the astm c67 standard. However, the MaTestLab operations team can assist you for your special requirements once you share your testing details with us.
    MaTestLab has a vast testing laboratory network, hence we bring you the best testing facilities in a cost-effective way. We offer considerable discounts (15-20%) to our returning customers based on test volume and frequency.
    The turnaround time for astm c67 test methodology depends upon the test procedure mentioned in the standard test document. However, we at MaTestLab understand your research requirements and hence try to get your test completed within the least possible time.
    Suyog Kamble
    About Author
    Suyog Kamble
    Suyog Kamble is an Operations Associate at MaTestLab Inc. and holds a postgraduate degree in Organic Chemistry.
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