LAKHTA S-311 — injection resin-foam for leaks and joint sealing

The special feature of LAKHTA S-311 is that one material does the work of two: on meeting water it foams and stops the leak, and in a dry cavity it polymerises into a dense elastic mass. Foaming starts 50 s after contact with water and ends within 6 min, the foaming ratio is up to 12, and without water curing takes 24 h. The resin-foam is pumped into cracks, joints and butt joints of reinforced concrete, stone and brick structures, including those subject to dynamic loads and vibration, and into voids behind tunnel linings.

Specifications

Manufacturer	Rastro (LAKHTA, SLAVYANKA, Izhora) — ZAO “Rastro”, Bolshaya Izhora
Type	injection waterproofing
Use	leak repair, joints and junctions, foundations and basements, tunnels and metro
Base	two-component hydro-active polyurethane injection resin-foam (foam/elastic resin) of low viscosity, free of organic solvents; components A and B — transparent liquids
Colour	components transparent
Packaging	24 kg kit: component A — 15 kg metal euro bucket, component B — 9 kg euro bucket
Application method	single-component pump (two-component — with the mix fed through one channel); for active leaks or openings wider than 0.3 mm, first F-100 or water plug; with minor water inflow, S-311 may be used straight away with re-injection; mix A:B 2:1 by volume (5:3 by weight) for at least 1 min with a 300 rpm mixer; inject until completely filled (checked by removing the heads of neighbouring packers); mechanised only, with an injection pump; packers from Ø10 mm; drill holes at 30…45° intersecting the crack/joint in the middle of the thickness, depth usually 2/3 of the thickness, spacing not more than 1/2 of the thickness (15…30 cm), most often in a staggered pattern; clean the holes with compressed air or water; inject from bottom to top or from right to left; raise the pressure gradually, not above Pmax = 10 atm × concrete class / 3 (for B45 — not more than 150 atm); after polymerisation remove the packers and fill the holes with LAKHTA joint waterproofing or LAKHTA repair compounds; flush the equipment with diesel fuel or motor oil; condition the material at +17…+22 °C for one day beforehand; do not allow moisture to get into the components
Application temperature	not lower than +5 °C (surface and air)
Curing	pot life of the mix at least 60 min (+20 °C); start of foaming on contact with water 50 s, end 6 min; polymerisation without water 24 h
Key properties	dynamic viscosity of the mix 200 mPa·s (+20 °C); density of the mix 1.1 kg/dm³; maximum foaming ratio 12; ratio A:B 5:3 by weight, 2:1 by volume; with water — an elastic watertight foam that withstands dynamic loads; without water — a dense elastic material; high adhesion and chemical resistance
Shelf life	12 months from the date of manufacture; in dry rooms at +5…+30 °C in the manufacturer's packaging
Standards	TU 20.16.56-029-11149403-2018

Data from the manufacturer’s technical data sheet. The coating system, number of coats and quantity are selected for your project on request.