Xypex MegaMix II Recommended for the Rehabilitation of:
- Water Tanks and Reservoirs
- Water and Wastewater Treatment Plants
- Concrete Water and Sewer Pipes
- Manholes and Vaults
- Marine Structures
- Bridge Structures
- Tunnels and Parking Garages
- Hydro Dams and Thermal Electric Facilities
- Excellent adhesion and bond to concrete substrates
- Resistant to chemical attack
- Low shrinkage, fiber reinforced
- Highly resistant to chloride diffusion
- Sulfate resistant (very severe sulfate exposure)
- Ready to use – just add water
- Vertical and overhead concrete repair; sprayable
- Non-toxic, no VOCs
- NSF 61 certified
- CE certified meeting EN 1504-3
Xypex Megamix II is available in 25 kg bags or in customized packaging to meet your specific requirements.
Xypex products must be stored dry at a minimum temperature of 7ºC. Shelf life is one year.
At 12.5 mm thickness, each 25 kg bag of MegaMix II will cover 1.05 m2.
1. SURFACE PREPARATION:
Remove loose, delaminated or unsound concrete by high pressure water blast, chipping, or other means. Complete structural or reinforcing steel corrosion repairs as necessary. Saw cut perimeter of repair area to a minimum depth of 10 – 19 mm preferred. Remove dust, micro fractured particles and foreign material from the repair area by pressure washing or other suitable means necessary to clean surface to obtain desired bond. A roughened surface texture such as ICRI CSP 5 or greater is typically required to achieve adequate bond. Maintain surface in saturated surface dry (SSD) condition for application of Xypex MegaMix II mortar.
2. MIXING PROCEDURES:
Best results are achieved using a mechanical mortar mixer and paddle with a capacity for low speed continuous blending. For small quantities of material a paddle mixer can be substituted. Mix typically requires 0.91 to 0.94 U.S. gallons of water per 3.45 to 3.55 litres per 25 kg bag. Use only sufficient clean water to create a medium to stiff mortar consistency. Add approximately 90% of the required amount of water to a mixer and then add the Megamix II powder. Mix briefly and add additional water to achieve the required consistency (do not exceed maximum water without consulting Xypex Technical Services Representative). Mix 3 – 5 minutes to achieve a uniform consistency. Over mixing or delivery delays may result in product stiffening. Do not over water.
3. APPLYING XYPEX MEGAMIX II:
Spray the repair area with clean water and allow the surface to come to a saturated, surface dry (SSD) condition. Maintain concrete substrate in this condition during the application process. For improved bond, apply scrub coat of Megamix II onto prepared surface using a stiff bristle brush. Apply full coat of Megamix II while scrub coat is still wet (generally within 20 minutes). When applying Megamix II by low pressure spray equipment, use sufficient velocity to compact and build the thickness of the mortar. The spray nozzle should have a minimum 12.5 mm orifice to prevent clogging. Spray-apply Megamix II, at a right angle to surface, at a distance of 450 – 600 mm. When applying Megamix II with a trowel ensure that the Megamix II is fully consolidated and worked well into the scrub coat and substrate. Complete finishing operations as quickly as possible. Megamix II can be finished to varying surface textures, including a rough finish directly from spraying nozzle, to semi-smooth using a wood or rubber float or smooth using a steel trowel.
4. APPLICATION THICKNESS:
The thickness of the Megamix II application will depend on specific job site conditions and requirements. As a general guide, application thickness should be between 10 mm and 50 mm. Single layer thickness for spray application will depend on equipment and applicator skill, but may be up to 50 mm vertical and 40 mm overhead. Roughen or score the surface before applying successive layers and apply immediately following initial set.
Curing is essential to achieve optimum quality and durability of the repair mortar. Cure Megamix II using moist curing methods. For moist curing, apply continuous source of moisture by spray, or utilize wet burlap and polyethylene sheet or other suitable means for a minimum of 3 days. Containment structures (i.e. reservoirs, tanks, etc.) can be filled with water following 3 days moist curing of the Megamix II coating. When using a 2:1 water to Xycrylic Admix blend as the mix liquid, wet curing should not be done except in extremely hot and dry conditions. In these conditions consult Xypex Technical Services.
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