OEE & Downtime in Building Materials & Cement
Key takeaways
- Measure OEE the same way every shift and compare against your own trend first.
- The big losses: kiln, crusher and mill availability, wear, and material handling.
- A few critical assets gate the line, so reliability is everything.
- Abrasive wear and dust drive unplanned stops if not managed.
Building materials, from cement and concrete to bricks, blocks and ceramics, is a heavy, abrasive, energy-intensive process built around a handful of critical assets: crushers, mills, kilns, mixers and long conveyor runs. When one of those stops, the whole line stops, so availability and reliability dominate the OEE picture.
What's a good OEE in building materials?
We found no published OEE range for cement and building materials alone with a stated method. The usual reference is 85 percent world-class (traced to Nakajima, Introduction to TPM, 1988), and published plant studies found average OEE of about 55 to 65 percent (sources: Ljungberg, 1998; Hedman et al., 2016); the more useful target is your own line's trend. The biggest separators are the availability of the critical assets and how well wear and blockages are managed, more than line speed. Calculate your OEE.
The biggest losses in building materials
| Loss | Why it's big in building materials | OEE factor |
|---|---|---|
| Critical-asset availability | Kilns, crushers and mills gate the whole line, see MTBF/MTTR | Availability |
| Abrasive wear | Liners, hammers, screens and conveyor components wear fast | Availability / Performance |
| Blockages & material handling | Chutes, hoppers and conveyors block; transfer points spill and jam | Performance |
| Dust & environment | Dust collection faults and housekeeping cause stops and wear | Availability |
| Energy & process constraints | Thermal and grinding energy limit throughput; process upsets lose product | Performance / Quality |
When a kiln or mill stops, the line stops. Reliability is the lever, start with MTBF/MTTR.
One block plant shift, worked through
Illustrative numbers for a concrete block machine making 6 blocks a cycle, so you can check the math against your own shift. Planned production time is 450 minutes. The shift log records a 30-minute mould change and a hopper blockage of 20 minutes: 50 minutes of downtime. The machine is rated at a 15-second cycle (24 blocks a minute) but runs at 18 seconds (20 a minute) because vibration time was raised for a denser mix. Aggregate bridging in the hopper and pallet feed jams stop it for about 30 minutes in short pieces, which nobody logs.
| Step | Calculation | Result |
|---|---|---|
| Availability | run time 400 min (450 - 50) / 450 | 88.9% |
| Blocks made | 370 running min (400 - 30 of short stops) x 20 a minute | 7,400 |
| Performance | 7,400 / 24 a minute / 400 | 77.1% |
| Quality | 6,920 good of 7,400 (480 cracked or out of height) | 93.5% |
| OEE | 88.9% x 77.1% x 93.5% | 64.1% |
The log explains 50 lost minutes. The machine lost 161.7: 50 of mould change and the blockage, 30 of short stops, 61.7 of running a slow cycle and 20 of rejects. The slow cycle is the largest single loss, and it came from one setting nobody reviewed.
Reason codes for a block and paver plant
A short list everyone uses beats a long one nobody does. A starting set:
- Changeover: mould change, product height change
- Material: hopper bridging, aggregate moisture, cement delivery
- Machine: pallet feed jam, vibrator, hydraulic fault
- Handling: cuber, conveyor, rack transfer
- Quality: cracked blocks, height out of tolerance, density
- Cleaning: mould clean, end of shift washdown
Log them in the free OEE tracker and the downtime Pareto ranks them for you; the downtime log template does the same on paper.
What a camera shows at a block machine
A stop code tells you the block machine stopped, not why the hopper ran empty in the seconds before. Where cameras are fitted, Fabrico's camera-based OEE software syncs camera video with machine data, so you can replay the moment the machine stopped. Cameras also catch short stops and a machine that is switched on but not producing, the losses nobody writes down: in the shift above, that is the 30 minutes the log never saw.
What downtime costs in building materials
These plants are capital-intensive and run continuously, so an hour of kiln or mill downtime is expensive and hard to recover. Add high energy use and the cost of any process upset, and reliability of the critical assets is the dominant economic lever. Estimate your downtime cost.
How leading plants improve
- Prioritise reliability of the critical assets (kiln, crushers, mills) with predictive maintenance.
- Manage wear proactively with planned liner and wear-part changes (planned vs unplanned).
- Keep material flowing by designing out blockages and spillage at transfer points.
The partner we recommend, Fabrico, reads stops from the line and, where cameras are fitted, uses computer vision to put video next to stoppages and blockages with a suggested cause, then lets a technician open the work order from the stop. It is EU-built, with data hosted in the AWS EU region and holds ISO 27001 / 20000-1 / 9001 (supports audit-readiness). Fabrico is a partner we recommend; the tools here are free regardless.
Is OEE the right metric for a continuous heavy process?
It applies, with availability as the dominant factor. Pair OEE with reliability metrics (MTBF/MTTR) on the critical assets that drive the loss.
What is the fastest win?
Usually reliability of the gating asset and proactive wear management, because an unplanned kiln or mill stop is the most expensive event. See the six big losses.
Does this cover concrete, brick and ceramics?
Yes. The critical-asset, wear and material-handling themes carry across cement, concrete products, brick, block and ceramics, even though the exact equipment differs.
Common equipment to troubleshoot: Concrete batching plants · Concrete block machines · Tunnel kilns · Tile presses · Thickness planers · Glue spreaders · Glass tempering furnaces · Four-sided moulders · Hammer mills · Pellet mills · Crushers · Grinding mills · Bucket elevators · Conveyors · Vibrating screens · full directory