Mortar spraying machine

concretescrewnot specified

Overview
GRC = Glass Fiber Reinforced Concrete. A GRC machine pumps and sprays a cementitious mortar mixed with glass fibres onto molds to produce decorative and structural precast components. The system enables controlled, repeatable application of fibre-reinforced mortar for architectural elements, landscaping and lightweight precast items.

Common applications

• Cornices and Wall Panels: decorative surrounds, window trims, Roman-style columns and architectural mouldings.
• Garden Landscaping: artificial rocks, large concrete planters, faux-tree structures and park elements.
• Modern Furniture: lightweight concrete tables, benches, fireplace mantels and other precast decorative furniture.

How it works (process)
The prepared mortar is fed into a pump (screw or peristaltic) and pressurised through hoses to a spray gun. Compressed air drives a pneumatic motor in the gun that chops continuous glass fibre into short lengths; the chopped fibre and mortar combine at the nozzle and are sprayed onto a mould. Consistent mix, correct aggregate grading and proper hose/pump cleaning are essential to avoid blockages and ensure uniform fibre distribution.

Recommended equipment & configurations

• Essential partner: an air compressor is mandatory for the spray gun to chop fibres and eject mortar.
• Air compressor guideline: commonly recommended ~15 kW, ~0.8 MPa (≈8 bar) and airflow around 0.36 m³/min (manufacturer guidelines vary).
• Typical starter setup: 4 kW spraying machine paired with a 2.2 kW mixer is a common entry package for small teams.
• Pump type guidance: 4 kW screw pump models are often recommended for beginners for their robustness and low maintenance; peristaltic pumps are an alternative in specific cases.

Beginner tips and daily maintenance

• Flush hoses, pump core and spray gun with clean water immediately after use until the water runs clear; daily cleaning of ~10 minutes preserves service life.
• Before spraying, run clean water or a thin cement slurry through the hose to lubricate and avoid dry-start clogs; never start with thick, dry mortar in a dry hose.
• Use controlled, filtered aggregates; avoid coarse or oversized sand to prevent jamming and pump damage.

FAQ (key points)

• Q: Do I need other equipment? A: Yes. A suitable air compressor is essential for the spray gun to chop fibres and deliver mortar.
• Q: How do I maintain the machine daily? A: Daily flushing/cleaning of hoses, pump core and gun for about 10 minutes prevents breakdowns and extends life.
• Q: Which pump type for a beginner? A: For budget-conscious startups, a 4 kW screw pump is a recommended beginner choice for reliability and low maintenance.

Technical specifications

• Function: Pumping and spraying glass-fibre-reinforced cementitious mortar to moulds.
• Recommended starter spray motor power: 4 kW.
• Suggested mixer power for starter setup: 2.2 kW.
• Recommended air compressor: approx. 15 kW; target pressure ~0.8 MPa (~8 bar); airflow ~0.36 m³/min (guideline).
• Pump types: screw pump (recommended for beginners), peristaltic pump (alternative).
• Daily maintenance: flush hoses, pump core and gun with water until clear; ~10 minutes/day recommended.
• Material handling: filter aggregates and control maximum particle size; avoid coarse/uncontrolled sand to prevent blockages.
• Typical uses: architectural mouldings, landscaping features, lightweight concrete furniture, precast panels.