Cemfiber® is a highperformance, monofilament, polypropylene fibre developed as a crack controlling additive for cementitious materials. It is used to inhibit the formation of small cracks which can occur through plastic shrinkage, premature drying and early thermal changes, in order to provide utilisation of the intrinsic properties of the hardened cementitious material.
Grace Cemfiber is based on selected raw materials and manufactured under controlled conditions to give a consistent product.
Specially designed for crack control in cementitious materials covering areas such as ready mix concrete, precast concrete, screeds, conventional shotcrete, rendering mortars, etc.
Principle uses of fibre concrete include: concrete slabs, pavements, driveways, imprinted concrete, curbs, pipes, grouts, shotcrete, overlays, patch repair, microsilica concrete, thin section walling, water retaining structures, marine concrete, heavy industrial floors, etc.
Benefits and Advantages
• Inhibits intrinsic cracking in concrete
• Disperses uniformly throughout the mix
• Improves finishing characteristics
• Improves concrete durability
• Increases impact and abrasion resistance
• Impervious to alkali attack
• Decreases construction time and labour
• Reduced risk of subsequent Damage
Appearance: Silvery white fibre, bundles
Air Entrainment: nil
Chloride Content: nil
Fibre Length: 12mm
Fibre Thickness: 18 micron S
pecific Surface Area: 225m2/kg
Concrete shall be manufactured using a crack controlling additive such as Grace cemfiber as supplied by Grace Construction Products or a similar approved product.
The crack controlling additive shall be based on a polypropylene fibre exhibiting fibre surface area of 225m2/kg with an individual fibre thickness of 18 microns. Fibre length shall be governed by the type of concrete being manufactured and the maximum aggregate size in use
The addition of Grace Cemfiber may produce a slight reduction in workability while increasing the cohesiveness of the mix. Serious overdosing of Grace Cemfiber will generally produce a reduction in workability and an increase in the cohesiveness of the mix.
With cements: Grace Cemfiber can be used with all types of Portland Cement, including Sulphate Resisting Cements and cement replacement materials. For use with special cements we recommend that you consult Grace Construction Products.
With other admixtures: Grace Cemfiber should not be pre-mixed with other admixtures. The performance of the material may be affected by the presence of other chemicals and we would recommend that Grace Construction Products be consulted in such circumstances.
Dispensing Grace Cemfiber is available in convenient concrete dispersible bags which are added, unopened, to the truck or central mixer.
Packaging Grace Cemfiber is available in 0.6kg concrete dispersible bags. All bags are supplied overpacked in cardboard boxes.
Storage Grace Cemfiber requires no special storage facilities under normal winter conditions.
Health and Safety See Grace Cemfiber Safety Data Sheet or consult Grace Construction Products