ASTM E1512 Standard Test Methods for Testing Bond Performance of Bonded Anchors

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Manufacturers of adhesive anchors, suppliers of construction materials, engineers, contractors, and quality-control professionals use ASTM E1512 testing to assess the performance of bonded anchoring systems. The required loading or environmental exposure is applied to the representative concrete/masonry specimens with the specified anchor and adhesive system installed. Load and displacement are measured and assessed, along with other necessary measures, to determine bond performance. Independent ASTM E1512 testing can support anchor qualification, product development, design-data generation, quality control, and comparison of different adhesive anchoring systems. ASTM identifies these tests as a means of generating information from which applicable design data and specifications can be developed. 

• Anchor Type: Smooth or deformed steel bars, threaded rods, and steel reinforcement bars. 
• Base Materials: Concrete and masonry, such as masonry units and mortar joints. 
• Bonding System: Chemical adhesive or bonding compounds applied to predrilled holes. Tension, shear, and combined tension and shear loading. 
• Environmental effects: Increased temperature, fire, moisture, freezing and thawing effects. 
• Bond Performance: Strength and behavior of the bond between the anchor and the bonding material. Adhesive-bonded anchorage systems in uncracked concrete or masonry. 
• Test Selection: Manufacturer or specifier chooses from tests that are appropriate for the anchoring system and intended use. The anchor is not considered to be in the concrete tension zone and is therefore not covered by the standard. 

What are the uses of ASTM E1512 Testing?

ASTM E1512 testing is designed to evaluate the bond performance of adhesive anchoring systems in a controlled environment and mechanical conditions. This information can be used to help engineers understand the behavior of the anchorage and for product qualification by manufacturers for intended uses. Common uses include:

• Anchor Qualification: Assess performance of adhesive-bonded anchors. 
• Bond Strength Evaluation: Estimate the strength of the adhesive-anchor interface. 
• Tension Testing: Test the performance of anchors when subjected to tensile forces. 
• Shear Testing: Check shear loading behavior. 
• Combined Loading: Studies how they perform when they are stretched and sheared at the same time. 
• Environmental Evaluation: Identify the effect of moisture, temperature, fire, and freeze-thaw. 
• Product Development: Compare different adhesive formulations and anchor configurations. 
• Quality Control: Check for consistency of produced anchoring systems. 
• Design Data: Compile data that can be used to support relevant design data and specifications. 

Which Materials Can Be Tested According to ASTM E1512?

ASTM E1512 covers steel anchors and steel reinforcement bars that are bonded to concrete or masonry. The anchor may be a smooth or distorted steel bar or threaded rod, and the bond is made using a chemical adhesive in a pre-marked hole. The standard is designed for anchorage systems in uncracked concrete or masonry and can be used to test various combinations of adhesive and anchors for tension, shear, combined loading, and environment. 

Why is ASTM E1512 Testing Important?

The performance of an adhesive anchor relies on the interplay between the steel anchor, adhesive, and concrete/masonry around the anchor. Another factor that can affect bond strength is environmental exposure and loading conditions, which may cause variations in strength or displacement. There are controlled procedures available for testing these effects in ASTM E1512. Routine testing can be used to evaluate anchoring systems, to determine bonding changes, and to provide information for qualification and engineering evaluation.

ASTM E1512 Testing Process and Data Collection

Technicians first identify the anchor, adhesive, concrete or masonry substrate, hole dimensions, and required embedment. They drill and clean the hole according to the specified anchoring-system installation procedure, install the adhesive and steel anchor, and allow the system to cure under the required conditions. The technician records the anchor diameter, hole diameter, embedment depth, specimen dimensions, adhesive information, curing conditions, and other installation details. For mechanical testing, the technician applies the required tensile, shear, or combined load while measuring load and anchor displacement. For environmental evaluations, the bonded anchor is exposed to the applicable temperature, moisture, fire, or freeze-thaw condition before or during mechanical evaluation. ASTM E1512 includes procedures for evaluating the effects of these conditions on bond performance.  The analyst reviews the maximum or specified load, displacement behavior, failure mode, and environmental exposure information. The report should identify the anchoring system, substrate, installation conditions, test configuration, measured results, failure observations, and applicable environmental conditions.

Common Challenges and Troubleshooting

Installation of anchors is one of the most significant sources of difference. The bond performance can be greatly influenced by the incorrect hole diameter, inadequate hole cleaning, improper mixing of the adhesive, incorrect embedment depth, or inadequate curing. Installation should be done according to the manufacturer’s instructions and technical notes and all installation conditions should be recorded. The way in which the negatives are loaded into the alignment can also affect the outcome. Unintentional stresses may be caused by eccentric loading or improper fixtures, and this may have an impact on the capacity measured. The testing system should be properly aligned, and load and displacement instrumentation should be checked prior to testing. The control and monitoring of temperature, moisture, exposure to freeze-thaw cycles, and fire-related testing are important. Exposure conditions must be recorded, and specimens must be conditioned according to the specifications before they are subjected to bond testing.

• Mechanical results are given on the basis of the test procedure and may contain the maximum load, specified load, displacement, and failure. The exposure condition and its implications on the bonded anchor should also be tested through the environmental evaluation.
• Data for load is typically reported in lbf or kN, for displacement in in. or mm, and for dimensions of anchor and hole in in. or mm, depending upon the applicable test procedure, and for temperature in °F or °C. According to ASTM E1512, the standard system of units is the inch-pound system, and SI (metric) values are presented for information only. 
• The technician documents anchor identification, adhesive type, substrate type, anchor diameter, hole diameter, embedment depth, specimen dimensions, curing conditions, applied load, displacement, environmental exposure, and failure behavior observed.
• The analyst records the measured load and displacement, calculated or derived bond-performance values (as appropriate), mode of failure, environmental effects, and compares with applicable qualification or design requirements.
• The report includes information on the anchor identification, adhesive identification, concrete or masonry description, specimen dimensions, installation information, embedment depth, test configuration, loading conditions, environmental exposure, measured results, failure observations, and applicable test requirements. 
• Technicians and analysts can consistently, reliably, and comparably deliver their ASTM E1512 results when they adhere to standardized hole preparation, anchor installation, adhesive curing, loading, environmental conditioning, displacement measurement, equipment calibration, and data evaluation.

Link to ASTM E1512