REKS® Strukto R4 — rapid-setting fibre-reinforced repair mortar of class R4
Rapid-setting mortar for repairing concrete after rebar corrosion and impact, resistant to liquid acidic media; from 30 MPa compression after one day.

Joint filling distinguishes REKS® Strukto 300 from the other mortars of the series: it is a rapid-setting thixotropic cementitious compound for repair work and filling of joints. It is used where the repair material must gain strength quickly, and for damage caused by rebar corrosion, mechanical and impact loads and the reaction of cement alkalis with the aggregate — in industrial buildings, tanks, treatment plants and tunnels. Class R4 per GOST R 56378, compressive strength at least 30 MPa after one day and 60 MPa after 28 days, bond to the substrate from 2.3 MPa.
| Manufacturer | REKS — OOO “SPS” |
|---|---|
| Type | thixotropic repair mortars |
| Use | industrial buildings, tanks and treatment plants, tunnels and metro |
| Base | rapid-setting thixotropic cementitious repair mortar for repair work and joint filling |
| Colour | grey |
| Packaging | bag 25 kg |
| Application method | repair of structures requiring rapid strength gain of the repair mortar; repair of damage caused by rebar corrosion, mechanical and impact loads, and the reaction between the alkaline constituents of cement and the aggregate |
| Application temperature | +5…+30 °C |
| Key properties | modulus of elasticity: ≥25,000 MPa; density of hardened mortar: 2.25 ± 5 % t/m³; freeze-thaw resistance: F2 400; bond to substrate at 28 days: ≥2.3 MPa; water impermeability: ≥W16; compressive strength at 28 days: ≥60 MPa; flexural strength at 1 day: ≥5 MPa; flexural strength at 28 days: ≥7 MPa; bond to substrate at 28 days after 50 freeze-thaw cycles in salts: ≥2.0 MPa; aggregate size: 1.25 mm; flowability (truncated cone spread on a flow table): 120–135 mm; flowability retention: ≥5 minutes; compressive strength at 1 day: ≥30 MPa; capillary water absorption: no more than 0.4 kg/(m²·min⁰·⁵) |
| Shelf life | 12 months from the date of manufacture |
| Standards | class R4 per GOST R 56378 |
Data from the manufacturer’s technical data sheet. The coating system, number of coats and quantity are selected for your project on request.
Rapid-setting mortar for repairing concrete after rebar corrosion and impact, resistant to liquid acidic media; from 30 MPa compression after one day.
Non-shrink thixotropic class R3 mortar for local repair and levelling of reinforced concrete in industrial buildings and tanks; compression from 40 MPa.
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Non-shrink fibre-reinforced R4 mortar in 25 kg bags for repairing bridges, tunnels, dams and columns; compressive strength from 55 MPa at 28 days.
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