CarbonWrap Repair ST is a fibre-reinforced cement dry mix that restores the geometry of concrete, reinforced concrete, brick and masonry structures: spalls, potholes, cracks and traces of erosion. It is used in repair and reconstruction and when installing the CarbonWrap external reinforcement system, including as a base for CarbonWrap Grid carbon grids. At 28 days the mortar reaches at least 50 MPa in compression, has frost resistance F200 and water impermeability W8, and works at pH from 4 to 13 and at constant temperatures up to +250 °C.
| Manufacturer | CarbonWrap — OOO “Nanotekhnologicheskiy tsentr kompozitov”, Moscow |
|---|---|
| Type | thixotropic repair mortars |
| Use | hydraulic structures and dams, tanks and treatment plants, industrial buildings, tunnels and metro, bridges and overpasses, floors |
| Base | dry construction mix on a cement binder with fibre (PAN fibre); filler — sand; modifiers — chemical admixtures |
| Packaging | paper bags with a PE liner, 25 kg (GOST 2226-88) |
| Application method | local restoration of geometry (spalls, potholes, cracks, erosion) of concrete, reinforced concrete, brick and masonry structures during repair, reconstruction and installation of the CarbonWrap external reinforcement system, incl. under CarbonWrap Grid carbon grids; remove weakened concrete mechanically down to sound concrete, chase out cracks to at least 5×5 mm, clean, dampen without standing water; water 0.15 l per 1 kg of dry mix, water at 20 ± 2 °C; pour the mix into the water, mix for at least 2 min, pause 10 min, remix; adding more water later is prohibited; apply to the damp substrate with a spatula or trowel, level with a vibrating screed or floats; not recommended for repairing asphalt concrete |
| Application temperature | air and structure +5…+35 °C for 24 hours; at lower temperatures — ensuring a surface temperature of not below +5 °C (heated enclosures, heat guns) |
| Curing | 24 h after application keep moist with water for 3 days; initial foot traffic — after 7 h; organic coatings — after 3 days, mineral finishes — not earlier than after 24 h |
| Key properties | compressive strength at 28 days at least 50 MPa; flexural strength at 28 days at least 8.5 MPa; bond strength to concrete at 28 days at least 1.5 MPa; frost resistance at 28 days at least F200; frost resistance of the contact zone at least Fkz 50; water impermeability at 28 days at least W8; workability grade Pk 2 (at a water demand of 0.18 l per kg); retention of initial workability at least 60 min; working time of the mortar mix no more than 40 min; residue on a 2.5 mm sieve no more than 2.0 %; bulk density 1.4–1.7 g/cm3; moisture content as supplied no more than 0.2 %; service in aggressive media at 4 < pH < 13 (H2SO4 pH 4, NaOH pH 13, mineral oil, kerosene, AI-95 petrol) and under constant exposure to temperatures up to +250 °C; hazard class 3 (GOST 12.1.007) |
| 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 5745-053-38276489-2017 (TU 23.64.10-053-38276489-2017); 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.
Epoxy saturating resin for the CarbonWrap system on structures operating at 60–110 °C, including together with fire protection; adhesion above 2.5 MPa.
Epoxy saturating resin for high-density carbon materials, for hand and machine impregnation; the “winter” version works from +10 °C.
Non-shrink rapid-hardening mix for fast repair of concrete, masonry and cellular concrete, including under CarbonWrap Grid; 30 MPa after one day.
CFRP laminate with an epoxy matrix for strengthening beams, bridges and industrial buildings; width 50 or 100 mm, strength above 3500 MPa.
Unidirectional 900/300 carbon tape on 24K yarn for the CarbonWrap strengthening system; 50 m roll 300 mm wide, fibre stronger than 4.9 GPa.
Unidirectional carbon tape for the CarbonWrap external reinforcement system, in rolls 150, 300 and 600 mm wide; fibre strength over 4.9 GPa.
