mineral / Cementitious / Precast Concrete
Hollowcore precast plank (150mm, 200mm, 250mm, 300mm, 400mm)
Factory-manufactured prestressed concrete floor planks with longitudinal voids, providing efficient structural flooring systems for spans up to 20m with fire ratings up to 4 hours
Atlas code
MIN-CEM-PC-001
At-a-glance signals
Factory-manufactured prestressed concrete floor planks with longitudinal voids, providing efficient structural flooring systems for spans up to 20m with fire ratings up to 4 hours
Overview
Executive summary
Hollowcore planks are precast, prestressed concrete elements manufactured using extrusion or slide-forming processes on long-line beds. Featuring 4-6 longitudinal cores that reduce weight while maintaining structural capacity, they are reinforced with high-tensile prestressing strands. Standard widths of 1200mm with depths from 150-400mm accommodate diverse loading and span requirements across commercial, residential, and industrial applications.
Best when…
- Rapid installation up to 1000m² per day
- No propping required during construction
- Immediate working platform
- Long clear spans reducing column requirements
- Excellent fire resistance (1-4 hours)
- Superior acoustic performance (STC 50-57)
- 40% less concrete than solid slabs
- High thermal mass for passive cooling
- Factory quality control to ISO 9001:2015
- Service ducts within cores
- Smooth soffit finish suitable for direct painting
Top advantages
- 01 Rapid installation up to 1000m² per day
- 02 No propping required during construction
- 03 Immediate working platform
- 04 Long clear spans reducing column requirements
- 05 Excellent fire resistance (1-4 hours)
Top limitations
- 01 Limited flexibility for on-site modifications
- 02 Requires crane for installation
- 03 Transport limitations for remote sites
- 04 Camber variation between units
- 05 Limited capacity for large penetrations
Technical
Physical ·9
- Density
- 1750 kg/m³ Varies with void ratio: 150mm=250kg/m², 200mm=300kg/m², 250mm=350kg/m², 300mm=380kg/m², 400mm=450kg/m²
- Specific gravity
- 2.35 Solid concrete portions
- Porosity
- 35 % Void ratio varies by depth
- Water absorption
- 5 % AS 3600 exposure classification dependent
- Hardness
- 7 Mohs Concrete surface hardness
- UV resistance
- Excellent Suitable for all Australian UV zones
- Chemical resistance
- Good Resistant to mild acids/alkalis
- pH tolerance
- 5 – 11 Surface exposure limits
- Surface roughness
- 6 μm Machine-screeded finish
Mechanical ·7
- Tensile strength
- 3.5 MPa Flexural tensile strength
- Compressive strength
- 45 MPa Characteristic 28-day strength; 25 MPa at transfer
- Flexural strength
- 6.5 MPa Modulus of rupture
- Shear strength
- 0.65 MPa Without shear reinforcement per AS 3600
- Poisson's ratio
- 0.2 Typical for concrete
- Impact resistance
- High Suitable for industrial floors
- Creep resistance
- 2 creep coefficient Long-term multiplier
Sustainability & Health
Embodied carbon & energy ·7
- Embodied carbon
- 85 kgCO₂e/m² 200mm plank typical; 40% less than solid slab
- Carbon footprint
- 320 kgCO₂e/m³ Cradle to gate (A1-A3)
- Embodied energy
- 2.1 GJ/m³ Manufacturing energy
- Water footprint
- 180 L/m² Production water use
- Recycled content
- 15 % Fly ash/slag typical
- Renewable content
- 0 % Mineral-based product
- Circular score
- 7.5 /10 Reusable, recyclable, durable
Compliance & Fire
Fire performance ·6
- Combustibility class
- Non-combustible AS 1530.1 compliant
- Fire resistance level
- 120/120/120 minutes Standard plank; up to 240/240/240 achievable
- Ignition temp
- null °C Non-combustible material
- Flame spread index
- 0 Non-combustible per AS 1530.1
- Smoke dev. index
- 0 Non-combustible
- Heat release rate
- 0 kW/m² Non-combustible
Cost & Lifecycle
Capex & lead time ·6
- Material cost (range)
- 180 – 350 AUD/m² Supply only; varies by depth and location
- Material cost (per unit)
- 250 AUD/m² 200mm typical supply and install
- Lead time
- 2-6 weeks Standard products; project dependent
- Lifecycle cost
- 8.5 AUD/m²/year 60-year design life
- Annual maintenance
- 0.5 AUD/m²/year Minimal maintenance required
- Market availability
- Excellent Multiple Australian manufacturers
Service life & durability ·3
- Expected lifespan
- 100 years With appropriate cover to reinforcement
- Maintenance interval
- 10 years Inspection only
- Warranty period
- 10 years Structural warranty typical
Layer D
Where it's used
Multi-storey commercial buildings
Residential apartments and units
Car parks and parking structures
Industrial warehouses and mezzanines
Educational facilities
Healthcare buildings
Retail complexes
Bridge decks and infrastructure
Stormwater detention vault lids
Agricultural storage facilities