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GLOSSARY & DEFINITION OF GRC TERMS

The ratio of the mass of total dry aggregate to the mass of dry cement in the GRC.

Glass fibres suitable for use in concrete which have a high alkali resistance (AR) as they have a minimum zirconium dioxide content of 16%.

Methods for the calibration of GRC spray equipment.

CCV stands for Composite Ciment Verre, and is the French name for GRC.

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The value of a property above which 95% of the population of all possible measurements of that property of the specified GRC are expected to lie.

Composite ciment verre, or CCV, is the French name for GRC.

“Test coupons”

A method of curing which prevents early loss of moisture and allows curing to take place without keeping the GRC damp. Dry curing is carried out by adding an appropriate quantity of the polymer into the GRC mix.

The person or authority responsible for the design of the GRC component.

The maximum dimensional variations (residual hydraulic shrinkage and reversible expansion) of a GRC composition attributable to variations in the water content to which products exposed to the elements may be subjected.

An initial layer without fibre but containing decorative sands or aggregates and often pigment.

Fiber Beton is another name for GRC.

Fiber Takviyeli Beton is the Turkish name for GRC.

GFB stands for Glassfaserbeton and is the German name for GRC.

GFRC, or Glass Fiber Reinforced Concrete, is a mixture of cement, fine aggregate, water, chemical admixtures and alkali resistant glassfibres.

Glasfaserbeton, or GFB, is the German name for GRC.

Glass Fiber Reinforced Concrete, or GFRC, is a mixture of cement, fine aggregate, water, chemical admixtures and alkali resistant glassfibres.

The ratio (expressed as a percentage) of the mass of glassfibre to the mass of GRC in the uncured [wet mix] state.

Glassfibre Reinforced Cement is a lesser used name for Glassfibre Reinforced Concrete or GRC.

Glassfibre Reinforced Concrete, or GRC, is a mixture of cement, fine aggregate, water, chemical admixtures and alkali resistant glassfibres.

The strength Grade of the “GRC”, based on the Characteristic MOR of the product.

The strength Grade of the “polymer- modified GRC”, based on the Characteristic MOR of the product.

GRC, or Glassfibre Reinforced Concrete, is a mixture of cement, fine aggregate, water, chemical admixtures and alkali resistant glassfibres.

A mixer with a high shear action capable of the preparation of the fine sand/cement slurries required for the spray process.

Also known as elastic limit. The stress in a flexural bending test where the stress/strain plot deviates from a straight line.

“Limit of proportionality”

Minimum film formation temperature (for acrylic polymers).

An initial cementitious sprayed coating without glassfibre.

The highest stress on a stress/strain plot during a flexural bending test.

“Modulus of rupture”

GRC which has been modified by the addition of an acrylic thermoplastic polymer dispersion either for ‘dry curing’ or for property enhancement.

A method of manufacture in which the pre-cut AR glassfibres and the cementitious slurry are blended during mixing.

A two-stage or variable speed mixer designed to prepare fine sand/ cement slurries (stage 1) and to blend in chopped AR glassfibres (stage 2) in the premix process.

The person or authority entering into a contract to manufacture a GRC product.

The person or authority entering into a contract to buy a GRC product.

A method of manufacture in which GRC is produced by simultaneously spraying the cementitious slurry and the AR glassfibre which is chopped from roving within the spray gun.

A test for measuring the consistency of the cementitious slurry.

The person or authority entering into a contract to supply goods to the producer.

A sheet of GRC manufactured during production for the purpose of assessing the quality of the GRC products being made. The test board may be a specimen of the product itself. The test board must be made in the same way and at the same time as the GRC product so that it is representative of the quality of the GRC.

The arithmetic mean value for a property calculated from all the individual test coupon results from one test board. For statistical analysis, this mean is regarded as one result.

Number of specimens taken from a test board for the purpose of determining a property.

The ratio of the MOR results of samples tested with the mould face in tension to those with the trowelled face in tension.

The stage in the manufacture of GRC when all physical processes that could alter the composition of the material are complete but the fibre can still be separated from the matrix by the action of running water.

The ratio of the mass of total water to the mass of dry cement in the GRC in the uncured state. When pozzolanic fillers are used they can be considered as cementitious and the water/cement ratio can be expressed as a water/total binder ratio; examples of such pozzolanic fillers are fly ash, silica fume and metakaolin.

“Glassfibre content by weight”

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