Chemical Anchor Pull-Out Test Failed – What Are the Possible Causes? Malaysia

Chemical Anchor Pull-Out Test Failed – What Are the Possible Causes? Malaysia

Why Does a Chemical Anchor Fail a Pull-Out Test?

A failed chemical anchor pull-out test does not automatically mean that the chemical anchor product itself is defective.

The actual performance of a post-installed chemical anchor system can be influenced by the anchor design, drilling process, hole cleaning, adhesive installation, curing conditions, embedment depth, concrete condition, workmanship and even the pull-out test setup.

When an anchor does not achieve the required test result, the cause should be investigated systematically rather than immediately repeating the test.

For professional on-site testing, the Langry APT200 Anchor Pull-Out Tester provides a maximum measurement range of 0–200kN, approximately a 20-ton class capacity, for suitable anchor pull-out testing applications.

What Does “Failed Pull-Out Test” Actually Mean?

Before investigating the cause, first define what “failed” means.

Depending on the approved project test procedure, failure may involve:

Failure to reach the specified proof load

Excessive anchor movement

Anchor slipping

Bond failure

Concrete cracking

Concrete breakout

Steel failure

Inability to hold the specified load

Another defined acceptance criterion

The project's approved test requirements should define the pass/fail criteria.

Cause 1 – Poor Hole Cleaning

Poor hole cleaning is one of the important installation factors to investigate for bonded anchors.

Drilling can leave:

Concrete dust

Loose particles

Debris

If the approved chemical anchor installation procedure requires cleaning and this is not performed correctly, the bond between the adhesive and base material may be affected.

Always follow the anchor manufacturer's specified hole-cleaning procedure.

Cause 2 – Incorrect Hole Diameter

Chemical anchor systems are normally designed around a specified drill-hole diameter.

A hole that is too large can change the intended adhesive geometry.

A hole that is too small may prevent correct installation.

The installer should use the specified drill diameter for the anchor system.

Cause 3 – Insufficient Hole Depth

If the drilled hole is too shallow, the threaded rod or steel bar may not achieve the required embedment.

This can reduce the effective anchoring condition.

Before installation, verify:

Required hole depth

Required embedment

Actual drilled depth

Cause 4 – Insufficient Embedment Depth

Embedment is a critical part of the anchor installation.

Insufficient embedment can occur because of:

Shallow drilling

Incorrect rod length

Obstruction inside the hole

Installation error

Incorrect marking

The installed embedment should match the approved anchor design and installation requirements.

Cause 5 – Anchor Tested Before Full Cure

Chemical anchor adhesives require sufficient curing before they can develop the intended performance.

Curing time can vary according to:

Product

Adhesive chemistry

Base-material temperature

Ambient temperature

Installation conditions

Testing too early can result in poor performance.

Do not assume that an anchor is ready for testing simply because the adhesive appears hard at the surface.

Cause 6 – Incorrect Adhesive Mixing

Many injection anchoring systems use two-component materials.

The components must be mixed correctly.

Possible problems include:

Incorrect initial discharge

Poor mixing

Damaged mixing nozzle

Incorrect cartridge handling

Partially cured material

If the adhesive is not mixed correctly, the anchor may not develop the expected bond.

Cause 7 – Insufficient Adhesive

Insufficient adhesive can leave incomplete bonding or voids around the anchor.

This may affect load transfer between:

Steel → Adhesive → Base Material

The approved injection procedure should be followed carefully.

Cause 8 – Air Voids in the Adhesive

Poor injection technique may leave voids in the drilled hole.

This can reduce the effective bonded area.

Correct injection procedures are particularly important for deeper holes and larger anchors.

Cause 9 – Incorrect Installation Temperature

Some chemical anchoring products have defined installation temperature ranges.

Temperature can influence:

Adhesive viscosity

Working time

Curing time

Installation behaviour

The installer should follow the chemical anchor manufacturer's technical instructions for actual site conditions.

Cause 10 – Expired or Improperly Stored Adhesive

Chemical anchoring material should be checked before installation.

Review:

Expiry date

Storage conditions

Cartridge condition

Product identification

Batch information where required

Material that has been stored outside the manufacturer's requirements may not perform as intended.

Cause 11 – Wrong Chemical Anchor Product

Not every chemical anchor is suitable for every application.

Selection can depend on:

Concrete condition

Anchor diameter

Required load

Installation direction

Environmental conditions

Project approval

Design requirements

Using an unsuitable product can result in poor performance even if the installation appears correct.

Cause 12 – Weak Concrete

Sometimes the chemical adhesive is not the main problem.

The surrounding concrete may be weak.

Possible conditions include:

Low-strength concrete

Honeycombing

Deterioration

Cracking

Damaged concrete

Poor local concrete quality

If the base material fails during the test, the anchor itself may still be strongly bonded to the failed concrete section.

Cause 13 – Anchor Too Close to a Concrete Edge

Edge distance can influence anchor behaviour.

An anchor positioned too close to an edge may have a greater risk of local concrete failure depending on the anchor system, load and test arrangement.

Always check the approved anchor design and project requirements.

Cause 14 – Anchor Spacing Is Too Close

Anchors installed close together can interact through the surrounding concrete.

This may affect the behaviour of the anchorage group.

Spacing requirements should follow the approved design.

Cause 15 – Water, Dust or Contamination in the Hole

Depending on the approved anchoring system, contamination can affect bond performance.

Potential contamination includes:

Dust

Water

Oil

Loose material

Construction debris

The hole condition should comply with the chemical anchor manufacturer's installation requirements.

Cause 16 – Incorrect Threaded Rod or Rebar

The steel component itself must also be appropriate for the approved anchoring system.

Check:

Diameter

Grade

Surface condition

Length

Embedment

Approved system compatibility

Substituting components without checking the approved design can affect the installation.

Cause 17 – Anchor Was Disturbed During Curing

A newly installed chemical anchor should not be unnecessarily moved while the adhesive is curing.

Movement can disturb the developing bond.

The manufacturer's installation and curing requirements should be followed before applying load.

Cause 18 – Pull-Out Tester Is Misaligned

Not every failed-looking result is necessarily caused by the anchor installation.

The test setup must also be checked.

The pulling force should generally be applied as axially as practical.

Poor alignment can introduce:

Bending

Side loading

Uneven force

Test instability

This may affect the test behaviour.

Cause 19 – Incorrect Pulling Adapter

The pull-out tester must connect securely to the anchor.

A poor adapter connection can result in:

Slipping

Damaged threads

Uneven loading

Unsafe testing

The adapter should match the anchor and expected force.

Cause 20 – Poor Reaction Setup

The hydraulic cylinder requires a stable reaction arrangement.

If the reaction setup is inappropriate, it may:

Affect surrounding concrete

Influence the observed failure mode

Create instability

Produce misleading behaviour

The test setup should match the approved method.

Cause 21 – Wrong Test Load

Another possibility is that the wrong target load was used.

For example, the operator may incorrectly assume that because the tester is rated to 200kN, the anchor should be tested to 200kN.

This is incorrect.

200kN is the maximum measurement range of the Langry APT200.

The required anchor test load must come from the approved project requirements.

Cause 22 – Incorrect Test Procedure

Different projects may specify different procedures.

These can involve:

Loading stages

Loading rate

Proof load

Holding time

Movement limits

Acceptance criteria

Using a different procedure can produce a result that cannot be properly compared with the project requirement.

What Should You Check After a Failed Test?

Do not immediately assume the product is defective.

A systematic investigation can include:

Confirm the required test load

Confirm the test procedure

Check the anchor type

Check anchor diameter

Verify embedment

Review drilling records

Review hole cleaning

Check adhesive batch and expiry

Confirm curing time

Inspect concrete condition

Review tester alignment

Check adapters

Review reaction setup

Record the failure mode

Consult the responsible engineer where required

Different Failure Modes Tell You Different Things

A useful investigation should record how the anchor failed, not simply the maximum force.

Anchor Pull-Out

The anchor or bonded element pulls from the hole.

Bond Failure

Failure occurs along part of the bonded interface.

Concrete Failure

Part of the surrounding concrete fails.

Steel Failure

The steel component itself fails.

Adapter or Connection Failure

The testing connection fails before the anchorage is properly evaluated.

Each situation requires different interpretation.

Why Photos Are Important After Failure

If an anchor fails, take clear photographs before disturbing the test area.

Useful photographs include:

Overall test location

Anchor before testing

Pull-out tester setup

Maximum reading

Failed anchor

Concrete damage

Extracted anchor where applicable

These records can help the project team investigate the cause.

Should You Immediately Retest the Same Anchor?

Not necessarily.

If the first test indicates a problem, simply testing again may not provide useful information.

First establish:

Why the test failed

Whether the setup was correct

Whether the test procedure was correct

Whether the anchor has already been damaged

Whether retesting is permitted

Follow the approved project procedure and responsible engineer's instructions.

Can You Test Another Anchor Nearby?

This decision should also follow the project's approved procedure.

Testing another anchor may help determine whether the problem is:

Isolated

Installation-related

Batch-related

Location-related

Systematic

However, additional testing should be planned rather than performed randomly.

Preventing Chemical Anchor Pull-Out Test Failure

Good results start before the pull-out tester arrives.

A strong installation QA/QC process may include:

Approved anchor system

Correct drill size

Correct drilling depth

Proper hole cleaning

Correct adhesive installation

Correct embedment

Controlled curing

Installation records

Defined test procedure

Properly selected testing equipment

Langry APT200 for Chemical Anchor Pull-Out Testing

The Langry APT200 provides a maximum measurement range of:

0–200kN

approximately:

20-ton class capacity

Key specifications include:

SpecificationLangry APT200Measurement Range0–200kNApproximate Capacity20 TonCylinder Centre Hole35mmCylinder Stroke70mmCommon AnchorageΦ6–Φ25Pull RodM24ConverterM6–M22Data Storage500 RecordsContinuous Working Time>200 HoursAccuracy ClassificationEN ISO 7500-1 Class 1

The actual suitability depends on the required test load, anchor configuration and approved test method.

Is 200kN Enough for Chemical Anchor Testing?

It depends on the required test load.

If the project requires:

Less than 100kN – APT100 may potentially be sufficient.

Above 100kN but within 200kN – APT200 may be considered.

Above 200kN – APT300 may need to be considered.

Always check the project requirement before selecting the tester.

Frequently Asked Questions

Why did my chemical anchor fail the pull-out test?

Possible causes include poor hole cleaning, insufficient embedment, incomplete curing, incorrect adhesive installation, weak concrete or an unsuitable test setup.

Does a failed test mean the chemical anchor brand is bad?

No. The complete installation and test setup should be investigated before determining the cause.

Can dust cause chemical anchor failure?

Where the approved system requires hole cleaning, residual drilling dust can negatively affect bonding.

Can I test a chemical anchor immediately after installation?

Testing should only be performed after the required curing conditions have been achieved according to the anchor system instructions and project procedure.

Can weak concrete cause a failed test?

Yes. The surrounding base material can be the controlling part of the anchoring system.

Can incorrect tester alignment affect the result?

Poor alignment can introduce unwanted bending or side loading and should be avoided.

Should I retest immediately after failure?

Not automatically. Record the failure, investigate the cause and follow the approved project procedure.

Is the Langry APT200 suitable for chemical anchor testing?

It can be used for suitable chemical anchor pull-out testing applications within its 200kN measurement range and compatible test configuration.

Where can I buy a chemical anchor pull-out tester in Malaysia?

MTM Precision Sdn. Bhd. supplies Langry anchor pull-out testing equipment for professional construction and QA/QC applications in Malaysia.

Chemical Anchor Pull-Out Tester Supplier Malaysia

MTM Precision supplies professional construction and civil engineering testing equipment for customers throughout Malaysia.

If you need equipment for chemical anchor pull-out testing, provide:

Anchor Type + Anchor Diameter + Required Test Load + Application

This helps determine whether Langry APT100, APT200 or APT300 is more suitable.

Contact MTM Precision

MTM Precision Sdn. Bhd.

Showroom & Service Centre

No. 29-1 & 29-2, Jalan Bandar 18,

Pusat Bandar Puchong,

47160 Puchong, Selangor, Malaysia

🌐 Website: www.mtmpre.com.my

📧 Email: mtmpre@yahoo.com

📱 WhatsApp: +6016-660 7346

For Langry APT200 Chemical Anchor Pull-Out Tester Malaysia, model selection, current quotation and construction testing equipment enquiries, contact MTM Precision.