LAKHTA penetrating waterproofing — dry mix for concrete

LAKHTA penetrating waterproofing is a one-component dry mix based on Portland cement with quartz filler and active additives, applied to dampened concrete of foundations, basements, tanks and pools. Injected into drill holes, it is also used to make a cut-off barrier in brick and rubble masonry. The compound penetrates concrete deeper than 100 mm, raises its water-tightness grade by 4…6 steps and its frost resistance from F100 to F200, and “heals” cracks up to 0.4 mm wide. The manufacturer’s instructions permit its use in drinking water tanks, and an expert opinion has been issued for the compound.

Specifications

Manufacturer	Rastro (LAKHTA, SLAVYANKA, Izhora) — ZAO “Rastro”, Bolshaya Izhora
Type	penetrating waterproofing
Use	foundations and basements, tanks and pools, drinking water
Base	one-component dry building mix on a cement binder ∆W4 (GOST 34669-2020): Portland cement, quartz filler, active chemical additives
Colour	grey dry mix
Packaging	paper bags with PE liner, 5, 10 and 25 kg
Application method	concrete at least 28 days old; remove weakened concrete, clean the surface down to open pores (wire brush, water jetting unit, sandblasting); chase out cracks wider than 0.4 mm, joints and junctions to 20×30 mm and fill with LAKHTA joint waterproofing; wet the surface thoroughly, remove free water; application to a dry surface is prohibited; mix the powder with water at +20±2 °C in the proportion given on the label, stir for 2 min, pause for 5 min, stir for another 1 min; apply by brush or texture spray gun (3…3.5 atm, nozzle 4…8 mm, distance ~0.5 m) in two coats on a damp surface, the second coat after 2…4 h; keep moist for 3 days; cut-off waterproofing of masonry — by injecting the slurry into drill holes (staggered pattern, 30…40°, spacing 150×100 mm) with cement grout pumped in before and after
Application temperature	+5…+35 °C (surface and ambient)
Curing	pot life of the slurry 30 min; second coat after 2…4 h; moist curing 3 days; finishing after 3 days (after removing the spent surface layer); filling tanks with water after 28 days; checking the result after 28 days
Key properties	raises the water-tightness grade of concrete by 4…6 steps (ΔW4…ΔW6); increases concrete strength by 10 %; raises frost resistance from F100 to F200; does not reduce vapour permeability; “self-healing” of microcracks up to 0.4 mm wide; penetration depth more than 100 mm; suitability for drinking water tanks — permitted; treated concrete serviceable up to +250 °C; aggressive media 4<pH<13 (ammonium more than 2,000 g/m3, magnesium 4,000…5,000 g/m3, petroleum products, hydrogen sulphide up to 0.0003 g/m3, methane up to 0.02 g/m3); dry mix: moisture 0.16 %, bulk density 1,105 kg/m3, chloride ions less than 0.05 %; mortar mix: workability Pk3…Pk4, workability retention 30 min, water retention 92.5…95.0 %; does not affect the protective properties of concrete with respect to reinforcement; hazard class 4
Consumption	for two-coat application 0.8 kg/m² (smooth concrete), 1.2 kg/m² (textured); cut-off waterproofing: 0.5 kg/linear m (Ø25 mm hole), 0.8 kg/linear m (Ø30 mm hole)
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 23.64.10-008-11149403-2021 (replacing TU 5775-008-11149403-2001); GOST 34669-2020

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