MAXRITE® 700
NORMAL SETTING, POLYMER MODIFIED SINGLE COMPONENT HIGH PERFORMANCE STRUCTURAL REPAIR MORTAR

Description

MAXRITE 700 is a single component polymer modified mortar, with microsilica and fiber reinforced. Large or small surfaces of new or old concrete can be repaired in a simple way, without the need for using any form work. Its long open time allows the application by mechanical means.

Uses

• Structural repair of concrete in columns, beams, walls, etc. affected by mechanical or carbonation damage, etc. in large or small surfaces.

Advantages

• Its open setting time, allows the quick completion of the repair of large surfaces.
• Good thixotropy. Application in successive layers without slump or the need to use form work.
• Appropriate for applications at high ambient temperatures.
• High adhesion to concrete and to reinforcements. Does not require special primers for the substrate. Loads are transmitted onto the repaired structure.
• Single component mortar. Only requires water for preparing the mix.
• Waterproof. Protects the reinforcements and resists freeze-thaw cycles.
• High mechanical resistance and good impact resistance. Long lasting repairs.
• High chemical resistant against aggresive environment, due to microsilica compounds.

Application Instructions

Preparation of the surface: Remove all damaged and loose concrete in the repair area, clean cut the edges perpendicularly to a minimum depth of 5 mm. Eliminate any concrete affected by carbonation and chloride attack.

Expose all reinforcements affected by corrosion, removing all the concrete until the edges of the bars are not affected by rust. Remove concrete all around the reinforcement for an efficient treatment all around and to be able to surround it with a minimum thickness of at least 1 cm of MAXRITE 700.

Eliminate rust by mechanical means, such as sand or shot blasting, needle gun, etc. It is not advisable to use metal brushes. Afterwards, an application of the oxide converter and protector MAXREST PASSIVE (Technical Bulletin Nº.: 12) is recommended. Use for this purpose a fine hair brush, avoiding as much as possible staining the concrete.

Dampen the exposed surface until saturated, without leaving excess water.

Mix of the product: MAXRITE 700 is mixed exclusively with clean water, free from contaminants, either manually or mechanically. For its manual application with trowel, 25 kg. of MAXRITE 700 require between 3.75 and 4.25 litres of water (16% + 1%) to achieve proper consistency of repair mortar. For applications using pump or spray machines the mixing water can by increased up to 4,5 litres per bag.

In any case these quantities are only indicative and must be checked depending on the desired consistency and the existing ambient conditions. Exceeding the quantities indicated can negatively affect the mechanical properties.

Allow the mix to rest for three minutes before starting the application. Mix again and start.

Application: For an optimum bonding, prepare a slurry, mixing MAXRITE 700 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.

While the slurry is still fresh, start placing the MAXRITE 700. Add more powder to the slurry leftover until achieving the consistency of a repair mortar, for manual applications and fluid consistency for pump application. Apply layers between 5 to 50 mm. thick. If
applied manually, place special attention in pressing with the trowel to prevent any air from being trapped. Mark the surface of each layer with the trowel to improve the adhesion of the following one, which can be placed once the previous one has hardened slightly.
Shape the last layer as desired before the final hardening occurs.

For repairs up to 7 cm. thick, clean, dry, crushed gravel 3 to 8 mm. in diameter can be added. The amount of gravel should not exceed 13 kg. per each 25 kg. bag or drum of MAXRITE 700.

Once the repair is finished, it is advisable to coat all the structure with MAXSEAL or MAXSEAL FLEX. This protection assures the waterproofing of the concrete and, consequently longer durability, allowing us to reduce to 5 mm. the minimum recommended
coverage of 10 mm. around the reinforcements indicated above.

Curing: Under extreme conditions of wind or heat, lightly spray water over the repaired areas for at least an hour. It is also convenient to cover them during the first 24 hours if the temperature is above 25 ºC and the relative humidity is below 50%.

Under very cold weather, protect the repair with insulation material. Do not apply below 5 °C or if lower substrate or ambient temperatures are expected during the 24 hours following the repair.

Cautions

If the slurry primer dries up, or the previous layer is completely set, apply a new slurry coat to continue the job.
Do not use any MAXRITE 700 leftovers to prepare a new batch.
Do not use mixing methods which cause violent mix and do not mix for prolonged periods as mechanical properties are reduced, as well as the life of the repair.
Do not use curing compounds on the repair.
Do not exceed the thickness or amount of mixing water recommended.
MAXRITE 700 is non toxic, but is an abrasive compound by its composition. When mixing and placing do not use bear hands but protect them with rubber gloves. If the product comes in contact with the eyes, rinse with abundant water but do not rub. If the irritation persists, consult a doctor.

Packaging

25 kg. bags and drums.

Storage

Nine months in bags and twelve months in drums, it their original unopened container, in a dry covered place, protected from frost and humidity.

Colours

Grey

Technical Data

Apparent density powder (kg/m3) | 1,130 ± 50
Mixing water (% weight w/ prod.) | 16 + 1
Pot life (minutes, 20 °C) | 60
Apparent dry density (kg/m3) | 2,140 ± 50
Setting time (minutes, a 20 °C) Beginning End | 75 120
Flexural strength (MPa) 7 days 28 days | 6.8 10.3
Compression resistance (MPa) 7 days 28 days | 43.3 56.4
Capillarity (C) (g / dm2 min ½) | 0.40
Dynamic modulus of elasticity (MPa) | 30,000
Adhesion (MPa) | 2.34

Tests, generally after 28 days
Mixing water: 15%
Test report 16.953 Part 12.1 by I.C.C. Eduardo Torroja

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.