AR glass fibres
Alkali-resistant chopped strands reinforce the cement matrix. The supplied technical profile uses approximately 5% fibre by weight for sprayed GRC.
GRC / MATERIALS & SPECIFICATIONS
Know the material.Specify the detail.
Composition, manufacture and typical properties of GRC, alongside architectural details from our projects.
DETAILS FROM OUR PROJECTS
Arched profiles
The repeated arches and cornices of Luxor Corniche.
01 / ARCHITECTURAL APPLICATIONPhotographs show architectural applications from the project archive. Colours and surface appearance are agreed through project samples.
COMPOSITION & CONTROL
The mix matters.
Fibre type, fibre content, aggregate grading, water–cement ratio, compaction and curing all influence the finished GRC. Raw materials and production controls must be considered together.
TECHNICAL REFERENCE / GRC
Typical materialproperties.
Reference ranges for hand-sprayed GRC. Mechanical values refer to the material at 28 days; they are not structural design values or a certificate for a supplied product.
| Property | Typical range | Basis |
|---|---|---|
| Dry density | 1,900–2,100 kg/m³ | Normal-density GRC |
| Flexural strength / MOR | 18–30 N/mm² | Hand-sprayed / 28 days |
| Limit of proportionality / LOP | 5–10 N/mm² | Hand-sprayed / 28 days |
| Ultimate tensile strength / UTS | 8–12 N/mm² | Sprayed GRC / 28 days |
| Thermal conductivity | 0.5–1.0 W/(m·K) | Depends on moisture content |
| Thermal expansion | 10–20 × 10⁻⁶ /°C | Depends on moisture content |
Typical ranges are cross-checked against the GRCA Practical Design Guide. Project acceptance is based on the specified grade and verified testing.
RAW MATERIALS
A controlledcomposition.
Cement & fine aggregate
Portland cement and washed, dried sand form the mortar. The company profile specifies a maximum sand size of 1.18 mm for sprayed GRC.
Water & admixtures
Clean water and correctly dosed admixtures control workability, cohesion and setting. Dosing follows the manufacturer’s instructions.
Pigments
Pigments can colour the material. Uniformity is checked against agreed samples and controlled through batching and production.
PERFORMANCE IN SERVICE
Design for thewhole component.
Moisture movement
Cement-based materials shrink on drying and expand when rewetted. Joints and fixings must accommodate moisture and thermal movement.
Exposure & resistance
Chemical resistance depends on the cement matrix, permeability and exposure conditions. Acidic or sulphate-bearing environments require project-specific assessment.
Sound & temperature
Panel thickness, mass and assembly affect acoustic performance. GRC can be combined with insulation; the material alone does not define the thermal performance of the wall.
MATERIAL ENQUIRIES