LAKHTA plaster waterproofing — waterproofing with levelling

If the substrate is uneven, LAKHTA plaster waterproofing is used instead of a coating: it levels the surface and protects it from water at the same time. The mix is applied by hand with a trowel and spatula or by machine — with a shotcrete gun or plastering machine, and thick layers are laid on reinforcing mesh. The mortar has grade W16, compressive strength of 35 MPa, bond to concrete of 2.0 MPa and frost resistance F300, and works under positive and negative water pressure. The manufacturer’s instructions permit it for drinking water tanks, and an expert opinion has been issued for the compound.

Specifications

Manufacturer	Rastro (LAKHTA, SLAVYANKA, Izhora) — ZAO “Rastro”, Bolshaya Izhora
Type	coating waterproofing
Use	foundations and basements, tanks and pools, drinking water, interiors
Base	one-component cement compound for waterproofing with simultaneous levelling (dry mix): Portland cement, quartz filler, active chemical additives
Colour	grey dry mix
Packaging	paper bags with PE liner, 10 and 25 kg
Application method	remove weakened concrete, clean, dampen without free water or prime with LAKHTA latex primer; mix with water at +20±2 °C as per the label, stir for 2 min, pause for 10 min, stir again; apply by hand (spatula up to 0.5 m, trowel) or mechanically (shotcrete gun, plastering machine), level with floats; thickness at least 7 mm; layers over 30 mm — on reinforcing mesh; horizontal and vertical surfaces; moist curing 3 days
Application temperature	not lower than +5 °C and not higher than +35 °C (air and structure, over a 24-hour period)
Curing	working time of the mortar not more than 60 min; moist curing 3 days; painting and finishing not earlier than after 3 days
Key properties	water-tightness grade of the mortar W16; increase in the water-tightness grade of concrete: 7 mm layer — 2 steps (4 atm), 20 mm — 3 steps (6 atm); compressive strength 35 MPa; flexural strength 9.0 MPa; frost resistance F300, contact zone Fkz50; bond strength to concrete 2.0 MPa; average density 2,200±10 % kg/m³; capillary water absorption 0.2 kg/m²·h^0.5, over 48 h 8 %; workability Pk2, workability retention 60 min, water retention 99 %; resistance to aggressive media (3<pH<13): magnesium 10,000 mg/l and ammonium 2,000 mg/l (highly aggressive), acidic pH3 and carbonic 80 mg/l (moderately aggressive), sulphate 1,000 mg/l (slightly aggressive); mineral oil, kerosene, AI-95 petrol 100 % — resistant; service under constant exposure to temperatures up to +250 °C; UV resistance; vapour permeability retained; suitability for drinking water tanks — permitted; hazard class 4
Layer thickness	7…30 mm in one layer without reinforcement, up to 50 mm with reinforcing mesh
Consumption	1.7 kg/m² per 1 mm of thickness
Shelf life	12 months from the date of packing; in dry rooms in the manufacturer's packaging; at temperatures above +30 °C protect from direct sunlight
Standards	TU 5745-007-11149403-2001; GOST 31357-2007

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