To fix balling with glued steel fibres, first check the feeding rate, mixing sequence, fibre dosage, aggregate grading, and mixer condition. Feed the fibres gradually into moving concrete rather than dropping the full amount in one spot, then allow enough mixing for the glued bundles to disperse. Do not add water simply to break up balls; instead, pause production if necessary, inspect the mix and equipment, and correct the likely cause through a controlled trial.
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Glued bundles are intended to help steel fibres feed into concrete in a more controlled way, but they do not guarantee trouble-free dispersion in every mix. Results depend on the concrete proportions, mixer, addition method, and fibre product. The steps below provide a practical troubleshooting process for ready-mix, precast, and site teams.
Balling occurs when fibres group together instead of dispersing through the concrete. A common process-related cause is introducing fibres faster than the mixer can separate and distribute them. If several bundles enter the same area at once, they may remain entangled as the surrounding material moves through the mixer.
Other contributing factors can include a high fibre dosage for the mix and equipment, an unsuitable mixing sequence, poor aggregate grading, or insufficient mixing after fibre addition. A worn or overloaded mixer can also make consistent distribution harder. These factors can interact, so operators should identify where and when balls form rather than assuming that the fibre product alone is responsible.
If visible balls appear, follow your plant’s quality and safety procedures before deciding whether the batch can be used. Check whether the balls are isolated or distributed throughout the mix, and note whether they formed during charging, mixing, discharge, or placement. Do not try to conceal the problem by adding water or unapproved admixture, because that can change concrete performance and may not separate the fibres.
Record the batch details while they are available. Include the fibre product and lot identification, target dosage, actual quantity added, mix proportions, mixer type, charging sequence, and the time spent mixing. This information helps distinguish a one-off feeding error from a recurring mix or equipment issue.
Add the fibres progressively into moving concrete, following the product supplier’s instructions and the plant’s validated process. Avoid pouring a complete bag or a large quantity into one point, onto a stationary pile, or directly into a poorly circulated zone. If a manual or automated feeder is used, check that its output is steady and that fibres are not bridging or releasing in slugs.
As a controlled starting comparison, a team might test feeding the same fibre quantity over 30 seconds and 60 seconds, provided the mixer and production procedure allow it. These are trial settings, not universal requirements; the suitable rate depends on the batch size, mixer action, and product instructions. Keep the other variables constant so the trial shows whether feed rate is affecting dispersion.
Confirm when fibres enter the mixer relative to the aggregates, cementitious materials, water, and admixtures. There is no single sequence that suits every plant and mix, so use the fibre supplier’s guidance and the concrete producer’s approved procedure. The essential point is to introduce fibres into a moving, workable mix where the mixer can distribute them, rather than allowing bundles to collect before circulation begins.
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After fibre addition, allow adequate mixing for dispersion, but do not assume that simply extending the cycle will solve every problem. For a controlled plant trial, compare the normal post-addition mixing period with an increase of 30 seconds, if permitted by the production process. Record the actual time and inspect the discharged concrete; excessive or unnecessary mixing may affect productivity and should be assessed within the plant’s quality controls.
Check the specified fibre dosage against the weighed quantity and batch volume. Confirm that scales, feeders, and batch records are operating as intended, and verify that the product supplied matches the project specification. If the mix or dosage has changed recently, ask the concrete mix designer and fibre supplier to review whether the new combination is suitable for the mixer and placement method.
Also review aggregate grading and the mix’s ability to move through the mixer. Changes in aggregate size distribution, moisture, or paste content can alter workability and fibre distribution. Do not modify water, cementitious content, or admixture dosage without approval from the responsible mix designer.
Check that the mixer is operating within its intended loading range and that blades, paddles, or other mixing components are in serviceable condition. Look for material build-up or areas where the mix may circulate poorly, following lockout and maintenance procedures when inspection requires access. A change in batch size or production rate can also affect mixing action, so compare the affected batch with a known stable process.
Use a trial plan to identify the cause rather than changing several settings at once. Keep the concrete proportions and fibre dosage unchanged while testing one process variable, such as feed duration or post-addition mixing time. A useful trial log can include fibre dosage in kg/m³, feed duration in seconds, post-addition mixing time in seconds, and observations of fibre distribution at discharge.
| What to check | What to record | Possible next action |
|---|---|---|
| Fibre feeding | Feed duration and any interrupted or uneven flow | Stabilize and, if appropriate, slow the feed rate |
| Batch proportioning | Target and actual fibre quantity in kg/m³ | Verify scales, feeder settings, and batch volume |
| Mixing | Sequence and post-addition mixing time in seconds | Test a controlled adjustment within approved procedures |
| Concrete condition | Mix consistency, aggregate condition, and discharge observations | Consult the mix designer before changing proportions |
Define acceptance criteria with the project and quality team before production trials. The criteria may include visible dispersion, workability, strength-related requirements, or placement performance, depending on the project specification. A trial that looks visually improved should not be treated as proof that all specified concrete properties are satisfied.
Contact the supplier when balling continues after the feeding process and mixer have been checked, or when the issue appears after a product, dosage, or mix change. Share the fibre designation, dosage, batch size, mix information, mixer type, addition sequence, feed duration, and photographs or observations of the balls where available. A supplier can use those details to discuss whether product selection, handling, or the application procedure needs review.
At BEKA, we can discuss your glued steel fibre requirements and review the application information you provide to help identify practical next steps. For a useful technical enquiry, include the intended application, project specification, target dosage, concrete mix details, mixer setup, and a description of when the balling occurs. Any proposed adjustment should be confirmed against your approved mix design and project requirements.
To fix fibre balling, begin by checking how quickly the fibres enter the mixer, whether the concrete is moving, whether the dosage is correct, and whether the mixer and mix proportions support dispersion. Make controlled adjustments one at a time, document results, and avoid using extra water as a shortcut. If the problem persists, share complete batch and process details with your mix designer and fibre supplier before changing the approved production method.
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