Why the 120 t/h Batch Plant Is the "Sweet Spot" for Regional Road Contractors

• Throughput vs. Footprint:​ Rated 120 t/h (≈ 960 t/8-h shift @ 100 % availability; realistically 80–90 % utilisation = 770–860 t/shift) — enough to service a 10–15 km overlay project without double-plant or excessive overtime, yet the modular skid-mounted units (dryer drum, screening tower, mixer tower, baghouse) fit on a 35 m × 25 m graded pad with room for RAP bin and bitumen tank farm.
• Mix-Formula Flexibility:​ Unlike continuous drum-mix plants, the batch process weighs each constituent per recipe — enabling rapid change between base-course (coarser, higher VMA), binder-course, and SMA / OGFC surface-course formulas (including polymer-modified bitumen and fibres) without purging the drum — critical when a single day's programme includes multiple mix-spec lots.
• Emissions & Quality Control:​ Equipped with pulse-jet baghouse (Nomex® / PPS filter media) and optional secondary volatiles-afterburner, the plant meets typical ≤ 20–30 mg/Nm³ particulate-emission limits; individual aggregate / filler / bitumen scales (± 0.5 % / ± 0.25 % / ± 0.25 % of full scale typical) ensure mix-design compliance per EN 13108/ AASHTO M 156.

Key Specifications (From TTM LB1500 Product Page)

• Model:​ LB1500 120TPH Asphalt Mixing Equipment
• Rated Output Capacity:​ 120 t/h (standard condition — moisture ≤ 3 %, ambient 20°C, 45 s mix + 10 s load cycle; actual depends on aggregate moisture & heat value)
• Cold-Feed Bins:​ 4 or 5 bins (volumetric belt feeders with frequency-control option); total live capacity 40–60 m³ typical
• Drying Drum:​ φ1500 × 6600 mm (typ.) counter-flow 4-pass; burner 600–900 kW (light oil / heavy oil / gas — select per region)
• Hot-Aggregate Screening:​ Double / triple deck vibrating screen — 4–6 fractions (e.g., 0–3 / 3–6 / 6–11 / 11–16 / 16–22 mm); screen area sized for 120 t/h
• Weighing System:​
  • Aggregates:2-stage (dribble + bulk) weigh hopper, load-cell accuracy ± 0.5 % FS
  • Mineral Filler:Separate micro-feeder + weigh hopper, ± 0.25 % FS
  • Bitumen:Positive-displacement pump + turbine or Coriolis mass meter, ± 0.25 % FS
• Mixer:​ Twin-shaft paddle type — 1500 kg/batch (nominal); mixing time 35–45 s; paddles & liner Ni-hard or high-Cr cast iron (replaceable); optional wear-monitoring shims
• Dust Collection:​ Pulse-jet baghouse (filter area sized for < 1.2 m/min filtration velocity); differential-pressure clean-cycle; stack-monitor port
• Control System:​ Siemens / Mitsubishi PLC + industrial PC/HMI — recipe library (≥ 99 formulas), real-time trend, alarms, production report export (CSV/Excel), remote-diagnostic-ready (VPN optional)
• Bitumen Supply System:​ Insulated storage tanks (30 / 50 kl) with thermal-oil heating jacket + circulation pump + metering skid
• Installation Footprint (Approx.):​ 35 m × 25 m (L × W) excluding aggregate / RAP stockpile & tank farm
• Power Installed (Approx.):​ 350–420 kW (varies with burner fuel type & ancillaries)
• Certifications (on request):​ CE (EU market), ISO 9001:2015 QMS, emission test report per local authority

Typical Application Scenarios

• Provincial / County Highway Overlay & Rehabilitation:​ 10–20 km sections — plant set centrally, trucks haul hot-mix < 30 min radius; 120 t/h sustains continuous paving at 2.5–3.0 m/min with typical paver widths.
• Municipal Arterial Road Reconstruction:​ Urban ring-road resurfacing where night-shift production + daytime paving cycle is used — batch plant's recipe-change agility supports base/binder/surface in same shift.
• Airport Taxiway / Apron (Where Spec Permits):​ Small-to-medium GA airports — base-course and binder-course production; verify mix-spec (PG grade, air-void target) with engineer.
• Central Mix Depot for Multiple Satellite Sites:​ Serves 2–3 crews via hot-mix delivery trucks; higher output allows staggered dispatch without plant bottleneck.
• Retrofit / Upgrade of Older 80 t/h Plant:​ Replace LB1000 dryer, screen-tower, mixer-module with LB1500-size components — TTM provides retrofit kits to reuse silos, tanks, and foundations where feasible.

Mixer Paddle & Liner Wear — What to Expect with PMB / SMA Mixes

• Paddle Material:​ Ni-hard (ASTM A532 Class I Type A) or high-Cr white iron (15–18 % Cr) — both offer 2–3× life vs. common manganese steel in PMB/SMA service.
• Liner Thickness & Monitoring:​ Minimum 30 mm initial; replace when locally worn to 15–18 mm or when paddle-to-liner clearance exceeds design spec — TTM supplies wear-shim templates for field check.
• Mixing Time Adjustment:​ SMA typically needs 40–50 s (vs. 35 s for dense-graded AC) to fully distribute fibres — programmable per recipe in the PLC; insufficient time leaves dry fibre clumps ("leopard spotting").

Sourcing Checklist for Contractors & Plant Operators

1. ✅ Confirm rated-output expectation & aggregate moisture condition​ — 120 t/h @ ≤ 3 % moisture; higher moisture or tropical climate may derate — discuss with TTM engineer.
2. ✅ Specify burner fuel type​ (light diesel / heavy oil / natural gas / coal pulveriser) — affects combustion-air & chimney sizing.
3. ✅ Request baghouse filter-media grade​ (Nomex vs. PPS vs. polyester) per your local emission-regime & operating temp.
4. ✅ Ask about modular transport dimensions​ — skids designed for 40-ft container or flat-rack shipment; confirm port / inland access.
5. ✅ Inquire about operator-training & commissioning scope, spare-parts list (paddles, liner, screen meshes, bag-cage sets), and optional remote-support contract.

Conclusion: The Balanced Workhorse for Mid-Tier Paving Programmes