The concrete replacement systems Nafufill LM and Nafufill KM 250 have a highly successful track record in the repair of both structural and non-structural concrete components. Now, with Nafufill KM 220 and Nafufill KM 230, MC-Bauchemie has developed two further concrete replacement systems offering new options to planning engineers and specifiers faced with finding the right repair solution.
While concrete repairs in Germany are preferentially aligned to the planning and execution requirements specified in the national standards ZTV-ING (Additional Technical Terms of Contract and Guidelines for Engineered Structures) or DAfStb (German Committee for Reinforced Concrete), in many other countries the European repair standard EN 1504 is exclusively applied for such work, not least because of the strength categories it specifies. In EN 1504 Part 3, repair mortar (concrete replacement) is classified as follows: R1 (compressive strength ≥ 10 N/mm²), R2 (compressive strength ≥ 15 N/mm²), R3 (compressive strength ≥ 25 N/mm²) and R4 (compressive strength ≥ 45 N/mm²). Given the different categories applied to ageing concrete, this makes complete sense.
Now, with Nafufill LM, Nafufill KM 220, Nafufill KM 230 and Nafufill KM 250, there are four types of repair mortar (concrete replacement) available that not only more than meet the requirements of EN 1504 Part 3, but also provide planners/specifiers with the security they need in tackling specific job requirements.
Nafufill KM 220 – Class R2 repair mortar
Nafufill KM 220 is a single-component, polymer-modified and fibre-reinforced mortar suitable for the surface repair of normal, lightweight and chipped brick concrete in structurally irrelevant areas of industrial buildings, civil engineering and residential construction. It is applied without a bond coat and is ideal for the reprofiling of fractured or broken surfaces, the application of levelling coats and fine filling work in layer thicknesses ranging from 3 to 30 mm. After 28 days at 23 °C and 50 % relative humidity, Nafufill KM 220 attains a compressive strength value of 24.5 N/mm². It is manually applied and, with low consumption values per unit area, offers high yield and thus good cost-efficiency.
Nafufill KM 230 – Class R3 repair mortar
Nafufill KM 230 is a single-component, polymer-modified and fibre-reinforced mortar (PCC concrete replacement) suitable for the surface repair of engineered concrete construction components as used in structurally relevant areas of industrial buildings, civil engineering and residential construction. After 28 days at 23 °C and 50 % relative humiditity, Nafufill KM 230 attains a compressive strength value of 34 N/mm². It can be applied in layers ranging from 6 to 60 mm thick, either as a partial or a full-surface repair coating. It can be both manually trowelled and sprayed and is characterised by its outstanding application properties. It is temperature and frost/thaw cycle resistant and exhibits also a de-icing salt resistance. With a fresh mortar application density of less than 2 kg/m²/mm, this product likewise offers exceptionally low consumption values.