DESCRIPTION
Mapefast HA is a liquid hardening accelerator for concrete and mortar to ensure higher early strength. Though the admixture is specially developed for cement-based products in which fly ash is incorporated it can be advantageous in all cement-based products. It complies with EN 934-2.
WHERE TO USE
· Concretes where high early strength and/or early stripping is required;
· Casting at lower ambient temperatures;
· Concretes and mortars containing fly ash.
TECHNICAL CHARACTERISTIC
Mapefast HA is a unique mix of different chemical components that yield considerably higher early strength in concrete and mortar, even at low temperatures. Most prominently this can be observed in concretes containing blended cements (as fly ash or slag). The hydration heat is liberated at an earlier stage, thus establishing strengths much quicker than standard concretes without Mapefast HA. Through this, it is ensured that the concrete reaches a mechanical strength necessary before stripping and also a strength that allows the concrete to freeze without permanently damaging the concrete. According to EN 13670, one must ensure that the concrete temperature does not fall below 0°C in any place before it has reached a compressive strength of 5 MPa. By Mapefast HA this requirement is easier to fulfill, but during winter months the use of Mapefast HA should always be combined with active protection of the concrete after placing. Mapefast HA does not contain chlorides that can initiate/cause corrosion of reinforcement. Mapefast HA does not affect the slump value or air content of the fresh concrete and does not significantly interfere with the concrete’s workability retention.
COMPATIBILITY WITH OTHER PRODUCTS
Mapefast HA can be combined with other Mapei admixtures, e.g. super-plasticisers in the Dynamon series for improved workability, and Mapeair entraining agents for the production of frost-resistant concrete
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