Batimix Accelerator 340

Description

BATIMIX Accelerator 340 is a chloride-free liquid admixture designed to significantly accelerate setting times of shotcrete mixes applied under wet or dry processes. Upon request, this product can be supplied in powder form.

Main Purpose

BATIMIX Accelerator 340 is used for shotcrete applications to build thick sections, vertical or overhead, with a minimum rebound. It allows rapid concrete setting to take place, particularly effective in cold temperatures and unfavorable weather conditions. Applications using BATIMIX Accelerator 340 include all types of shotcrete and sprayed concrete with or without steel embedments.

Features

Concrete prepared with BATIMIX Accelerator 340 is characterized by the following:

In the plastic state:

• Decreased overtime, allowing same-day finishing Reduced initial and final setting times
• Improved thixotropic properties, which allow thick sections to be built
• Minimum rebound and single-pass spray coatings
• Reduced bleeding and segregation

In the hardened state:

• Reduced construction costs – no cold weather delays
• Increased early compressive and flexural strengths

Properties

• Appearance: liquid
• Specific gravity: 1.38 ± 0.02 at 23 ºC
• Chloride content: nil
• Air entrainment: less than 1.5% at normal dosages
• Alkali content: less than 0.5% as Na₂O

Health and Safety

BATIMIX Accelerator 340 is not a hazardous material. However, it should not be swallowed or allowed to come into contact with skin and eyes. Suitable gloves and goggles should be worn. For additional information, kindly refer to the product’s Material Safety Data Sheet.

Compliance with Standards

BATIMIX Accelerator 340 complies with the following standards:

• EN 934-2: T6
• ASTM C 494 Type C

Dosage rates

The optimum dosage of BATIMIX Accelerator 340 to meet specific requirements is best determined by trials using the actual mix composition with site materials under conditions that will be experienced in use. As a guide to the trial tests, the addition rates shall vary from 2% to 5% of the cementitious materials. Dosages outside the specified range may be used if necessary to meet particular mix requirements.

It is to be noted that the free water content should be reduced when designing concrete mixes with BATIMIX Accelerator 340 to maintain similar W/C.

Effect of Overdosing

In general, an overdose of BATIMIX Accelerator 340 will produce a highly cohesive material with significant loss in workability and increased early strength as compared to that normally obtained. The rapid initial acceleration of the cement hydration process due to overdosing will generally lead to slightly reduced 28-day compressive strength.

Compatibility

BATIMIX Accelerator 340 is compatible with all other Batimix admixtures incorporated in the same concrete. During batching, all admixtures should be added separately to the concrete mix as this may alter their performances. Concrete mixtures based on Portland cement with or without replacement materials such as silica fume, fly ash, and blast furnace slag are compatible with BATIMIX Accelerator 340.

Dispensing

For “dry process” shotcrete applications, BATIMIX Accelerator 340 is directly added after the air ring in the spray nozzle. For consistent and accurate supply of the admixture during spraying, the pressure of the delivery system should be adjusted taking into consideration several factors such as type of equipment, diameter hose, and distance to application area. Make sure to agitate well the product prior to use.

In the “wet process”, BATIMIX Accelerator 340 should not be directly added on the dry cement; it should rather be introduced after incorporating around 2/3 of the mixing water. A mid- or high-range water reducing agent should be used to reduce water content while improving workability of the mix.

Technical Support

Holderchem provides, upon request, technical advisory services pertaining to the concrete mix design, admixture selection, materials testing, and dispensing system.

Storage

BATIMIX Accelerator 340 has a minimum shelf life of 12 months if kept unopened and stored at temperatures ranging from 2 to 50 ºC.

Packages

• 1 t IBC
• 200 kg drum
• 20 kg pail
• 4 kg pail