SAPY’s Corehfil™ Fibres are made of virgin polypropylene, a fully recyclable and non-toxic Homopolymer. Corehfil™ Fibres improves the resistance to early age cracking which is mainly caused by stresses that develop before the concrete has developed sufficient strength. This normally occurs during the first 24 hours after placement, when the concrete is most vulnerable to dimensional change. When added to concrete, Corehfil™ Fibres limit the potential for plastic shrinkage cracking and plastic settlement cracking. The high surface area of millions of dispersed microfibers improves the durability of concrete by increased cohesion, reduced bleeding and lowered permeability.
Supplied in convenient, soluble paper packaging, SAPY’s Corehfil™ Fibre can be added directly to the concrete mixer during the batching process. The fibre dosage is dependent on the project requirements and specifications and could typically range from 600g to 900g per cubic metre of concrete. Sufficient mixing time must be allowed (normally at high speed for 5 – 6 minutes, or approximately 80 revolutions for a drum mixer) to ensure adequate distribution of the Corehfil™ Fibres throughout the concrete. Concrete trial mixes must be conducted to determine the optimum performance mixing time and dosage of the Corehfil™ Fibre to meet the end-use requirements.
Typical applications of Corehfil™ Fibre modified concrete include; driveways, pathways, precast elements, plasters, commercial and industrial floors as well as a number of other specialist applications such as repairs.
SAPY is supplying the Corehfil™ micro-fibres extensively to various local customers including Lafarge. Corehfil™ micro-fibres are also exported throughout Africa and the Middle East, as well as to countries including Australia, China and the UAE. Substantial volumes were used in the construction of the new Dubai International Airport.
SAPY is actively engaged in investing in our future, and has partnered in the past with a number of facilities, including various departments at Stellenbosch University. Please follow the links below to download two interesting articles supplied by Prof Billy Boshoff and Riaan Combrinck, Unit for Construction Materials, Stellenbosch University.