BIRSS 30 Spets — cement-polymer mix for vertical and overhead surfaces
Non-shrink fine-grained mix for non-structural repair and levelling of concrete on vertical and overhead areas; workability is retained for 60 minutes.

The anti-freeze admixture in BIRSS RSM-2M M550 Moroz extends the construction season: the mix, based on Portland cement and special cements with fibres, is designed for repair at low and sub-zero temperatures and is applied by hand. It is used to fill vertical joints of concrete and reinforced concrete structures, cracks, recesses and grooves, and to restore areas without formwork. At −15 °C the mortar reaches 10 MPa in compression in 3 days and 20 MPa in 28 days, at +20 °C 35 and 55 MPa; class R4, F2 400.
| Manufacturer | BIRSS — AO Opytny Zavod Sukhikh Smesey (Experimental Dry Mix Plant), Moscow |
|---|---|
| Type | thixotropic repair mortars |
| Use | bridges and overpasses, tunnels and metro, hydraulic structures and dams, columns and beams, industrial buildings |
| Base | BIRSS RSM-2M M550 Moroz dry repair mix is a material based on Portland cement and special cements, graded sand, fibres and chemical admixtures, including an anti-freeze admixture that makes it possible to extend the construction season and improve the functional properties of the mortar: adhesion, … |
| Colour | grey |
| Packaging | bag 40 kg |
| Application method | BIRSS RSM-2M M550 Moroz dry repair mix is intended for repair at low and sub-zero ambient temperatures for the following work: filling vertical joints of concrete and reinforced concrete structures; repairing cracks and other recesses and grooves in concrete surface elements; repairing concrete surface elements without formwork. Recommended for hand application. Use of the dry mix at ambient temperatures above +5 °C is possible only after consultation |
| Application temperature | −15…+30 °C |
| Key properties | maximum aggregate size, mm: 5; workability grade: Pk2/4-8; workability retention, min: 20; bond strength to substrate, MPa: 2; compressive strength, MPa, not less than At t= -15 °C At t= +20 °C -1 / 3 days 3/10 15/35 - 7 / 28 days 15/20 50/55; flexural strength, MPa, not less than At t =-15 °C At t = +20 °C - 1 day/3 days -/2 -3 - 7 days/28 days 3/6 5/10; water impermeability: W12; frost resistance: F2 400; sulphate resistance coefficient: 0.9; service temperature, °C: from -50 to +70 |
| Standards | class R4 to GOST R 56378; STO 05668056-004-2012 |
Data from the manufacturer’s technical data sheet. The coating system, number of coats and quantity are selected for your project on request.
Non-shrink fine-grained mix for non-structural repair and levelling of concrete on vertical and overhead areas; workability is retained for 60 minutes.
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