MAXREST®
NON-SHRINK, QUICK-SETTING STRUCTURAL REPAIR MORTAR FOR CONCRETE AND MASONRY

Description

MAXREST is a ready to use product, made of special cements and additives. These ingredients make the material a quick-setting repair mortar that does not shrink. It firmly adheres to the surface which it is applied on, and restores concrete to its original condition.

Uses

• For general repair and restoration work on structural concrete.
• Repair and protective covering of superficial reinforcing rods threatened by corrosion.
• To repair lintels, raincaps, water tanks and to restore architectural concrete permanently exposed to the weather.
• For general surface restoration, i.e. patchwork and sealing cracks.

Advantages

• Rapid-setting, between 15 and 20 minutes, depending on the temperature.
• Its grey colour matches perfectly with concrete.
• Repairs made are structurally sound, with properties comparable to concrete.
• It is odourless, non-toxic, making it the ideal material to use in badly ventilated places, such as: water tanks, shafts, sewers, etc.
• Its rapid setting allows for an agile repair process.
• It only needs the addition of water does not require resins.

Application

Surface preparation. Concrete should be free of all loose particles and dirt; reinforcing rods must be rust free. To clean these surfaces, sandblast or use a wire brush to clean the rust. Apply the oxide converter MAXREST PASSIVE (Technical Bulletin Nº 12). The concrete to be repaired must be structurally sound. After cleaning, wash the concrete with water. Before applying MAXREST, wet the surface.

How to mix MAXREST. Use only clean water to mix MAXREST. 25 kg. of MAXREST are mixed with between 3.5 to 4.0 litres of clean water, depending on the ambient conditions.
For an optimum bonding, prepare a slurry, mixing MAXREST with about 10% more water than recommended for the repair consistency, mixing well until achieving a homogeneous consistency without any lumps. Apply the slurry using a MAXBRUSH type brush on the surface to be repaired and on the reinforcement bars, filling all voids and pores, allowing 5 to 8 minutes before continuing the application.
While the slurry is still fresh, start placing the MAXREST. Add more powder to the slurry leftover until achieving the consistency of a repair mortar, and apply in successive layers of 2.5 to 3 cm., each.

Between layers, wait ten to fifteen minutes, depending on the temperature. Scratch the surface with the trowel to make the next layer adhere firmly. If the different layers become warm wet the surface with cold water. For better curing once the job is finished cover with wet cloth to protect from the sun and high temperature.

Setting. Once mixed with water, MAXREST takes fifteen to twenty minutes to set, depending on the temperature. Mix only the amount of MAXREST that can be applied within eight to ten minutes.

Recommendations

At high temperatures:
Keep the product in a cool place.
Use fresh, clean cool water for the mix.
Wet the different layers.
Mix small batches of material and apply immediately.

At low temperatures:
Keep the product in a warm place.
Use lukewarm water to accelerate the setting time.

Consumption

One kilogram of MAXREST will fill approximately 0.6 litres.

Caution

• Do not use leftover mixed material to prepare a new batch.
• Do not add sand, aggregates or cement to increase volume.
• Do not use mixers to prepare the mix. Avoid continuous mixing.
• Do not allow the layers to heat up; water continuously with cold water.
• Do not apply MAXREST on frozen surfaces, or on smooth surfaces.
• Do not apply on painted or structurally weak surfaces.
• Do not apply in layers exceeding 3 cm. thick.
• Do not apply at temperatures below 5ºC.
• As all cement products, MAXREST is abrasive, and protective rubber gloves must be used to prepare the mixture and apply it. If any of the mixture gets into the eyes, rinse thoroughly with clean water, but not rub. If irritation continues, consult a doctor.

Technical data

Apparent density in powder (kg/m3) | 1,045 ± 50
Mixing water (% weight / weight prod.) | 15 + 1
Pot life (minutes, 20 °C) | 15
Apparent dry density (kg/m3) | 1,980 ± 50
Setting (minutes, a 20 °C) Beginning Final | 20 25
Flexotraction strength (MPa) 7 days 28 days | 5.0 7.7
Compression strength (MPa) 7 days 28 days | 29.0 45.5
Capillarity (C) (g / dm2 min ½) | 1.24
Elasticity modulus (MPa) | 21,000

Tests in general, at 28 days
Percentage of mixing water: 15%
Report nº 16.953 Part 13.1 by Inst. Eduardo Torroja C.C.

Packaging

25 kilogram drum and bag, and 5 kilogram can.

Storage

9 months in bags, 12 months in drums and cans, in their unopened original containers, in a dry, cool place, protected from damp and frost.

Guarantee

The information contained in this leaflet is based on our experience and technical knowledge, obtained through laboratory testing and from bibliographic material. DRIZORO reserves the right to introduce changes without prior notice. Any use of this data beyond the purposes expressly specified in the leaflet will not be the Company’s responsibility unless authorised by us. We shall not accept responsibility exceeding the value of the purchased product.

© 2003 DRIZORO S.A. All rights reserved.