Repair mixture for concrete ICBM 500 Appointment : Dry construction mix MBR 500 is intended for the preparation of building fine-grained concrete (mortar) used for repairing concrete structures, monoling joints, technological holes, sealing cracks in concrete, brick walls, ceilings, etc. Composition :             Dry construction mix MBR 500   is a polymer-mineral fine-grained mixture obtained by intensive mixing of fractionated sand, Portland cement and a complex of modifying additives. Concrete preparation : For the preparation of dry building mix MBR 500   pour into clean fresh water, constantly mixing until a homogeneous mass is obtained using an electric drill with a mixer nozzle or a low-speed forced-action mixer. The amount of water required for the preparation of concrete is determined from the ratio of 0.18-0.19 l per 1 kg of dry construction mixture. Excess water contributes to the formation of cracks. Ready concrete must be used within 15 minutes. Preparation of the working surface (base) : The working surface (base) must be strong, durable, free of dust, dirt, oils, fats, wax, bitumen, paint residues, cement milk, efflorescence. Cracks are broken, old fragile concrete is removed, the released reinforcement is cleaned of rust. The prepared surface is cleaned of dust with compressed air, washed with water or treated with a sandblasting machine. It is necessary to treat with a polymer-mineral primer weak and highly absorbent substrates. Metal parts must be treated with an anti-corrosion solution. Concrete Application : Before applying concrete, the prepared surface is abundantly moistened. The water is allowed to soak and then manually apply concrete with a spatula. It is necessary to reinforce the applied repair layer with large areas of the surface to be repaired, repair of places subject to large bending loads, and a concrete layer thickness of more than 50 mm. Concrete laying is carried out without interruption until complete completion, or by grips. Before applying subsequent layers, it is necessary to moisten the previous layer, i.e. observe the processing method - “wet on wet”. The temperature of the working surface should be at least + 5ºС and not more than 30ºС. At negative temperatures up to -10ºС, the repair mixture MBR500M is used. To prepare the solution, it is necessary to use water at a temperature of at least 15 ° C. Stir the solution until the antifreeze additive is completely dissolved for at least 5 minutes from the moment of adding water. The consumption of dry mix depends on the type of repair. To repair a damaged horizontal surface with a repair layer thickness of 50 mm, 95-110 kg of mixture per 1 sq.m. To close a hole in a concrete wall with a diameter of 30-35 mm and a depth of 10 cm, 150-200 g of mixture is required, to close a crack with a width of 20 mm and a length of 1 m at a depth of 20 mm, 700-750 g of mixture are required. Specifications : Astringent Portland cement Aggregate fractionated sand Placeholder fraction up to 1.0 mm Water retention capacity not less than 9 5 % Maximum thickness in one run 50 mm Water consumption for cooking 0.18-0.19 L per 1 kg of mixture Viability not less than 60 min Work surface temperature For MBR-500 For MBR-500M   from + 5˚С to + 30˚С from -10˚С to + 5˚С Compression strength after 28 days (grade) 500 kgf / m 2 (50 MPa) Peel strength from concrete surface 17.5 kgf / m 2 (1.75 MPa) Frost resistance no less than 400 cycles Water resistant not less than W 10 Safety precautions : Portland cement contained in the mixture, when interacting with water, forms an alkali. Avoid getting ready-made mortar on the skin and mucous membranes. In case of contact, rinse the contact area with clean running water.             Strength chart of ICBM 500M (seven-day strength calculation) No. p / p Hardening temperature, ° С The strength in the samples is 70.7x70.7x70.7 mm when hardening for 1 day 3 days 7 days 14 days 28 days 1 twenty 15.8 22.4 32,7 40.5 51.0 2 -5 3.3 10.0 18.1 20.8 28.5 3 -10 2,4 8.1 14.5 17.8 26.9   The set of strength can vary within the permissible variation of 15%.   Shelf life : Store mortar in a dry place at a relative humidity of 60%, temperature from –50 to +50 ˚С. Shelf life in the manufacturer’s packaging 6 months from the date of manufacture