Batimix Fly Ash DG3-P

Description

BATIMIX Fly Ash DG3-P is a powder fly ash pozzolanic additive used in wet and dry-mix shotcrete applications to enhance strength and durability and reduce the permeability of hardened concrete.

Main Purpose

BATIMIX Fly Ash DG3-P are ultra-fine particles that significantly improve the particle packing of shotcrete mixes as they physically fill voids in the cement paste. This leads to a more densified shotcrete skeleton with a reduced level of bleeding. On the other hand, this product reacts chemically with the calcium hydroxide present in the cement paste, yielding a calcium silicate hydrate gel that significantly enhances strength, water/chloride impermeability, and durability. Applications incorporating this product include all types of high strength and specialty shotcrete and repair applications.

Features

Shotcrete prepared with BATIMIX Fly Ash DG3-P are characterized by the following:

In the plastic state:

• Better cohesiveness with less bleeding and segregation

In the hardened state:

• Increased compressive and flexural strengths at all ages
• Greatly reduced permeability against water and aggressive chemicals
• Increased resistance to abrasion and erosion
• Improved durability and better surface quality

Properties

• Appearance : grey powder
• Bulk density : around 540 to 860 kg/m³
• Amorphous SiO₂: 56.28%
• Average particle diameter: 0.1 – 0.15 micron

Health and Safety

Batimix Fly Ash DG3-P is not a hazardous material. However, it should not be swallowed or come into contact with eyes. Suitable goggles should be worn.

Fly ash is a byproduct of burning coal in power plants, and it can contain small amounts of heavy metals. Therefore, proper handling and disposal of fly ash are important to ensure public safety and environmental protection.

The Occupational Safety and Health Administration (OSHA) has set regulations for the handling and storage of fly ash to protect workers from potential health hazards. These regulations include measures such as providing personal protective equipment, establishing proper ventilation, and minimizing worker exposure to fly ash dust.

In addition, the Environmental Protection Agency (EPA) has established guidelines for the disposal of fly ash to prevent environmental contamination.

Overall, with proper handling, storage, and disposal, fly ash can be safely managed and its potential risks minimized.

For additional information, kindly refer to the product’s Material Safety Data Sheet.

Compliance with Standards

Batimix Fly Ash DG3-P meets the requirements of Class F admixtures according to ASTM C618 Standard Specification for Coal Fly Ash and Raw or Calcined Natural Pozzolan for Use in Concrete.

Dosage Rates

Batimix Fly Ash DG3-P is normally used at the rate of 15% to 25% of the cement weight. Dosage varies with the reactivity of the ash and the desired effects on the concrete. Primarily trials tests are recommended using the actual mix composition with site materials, in particular if dosages greater than 25% of the cement weight are to be used.

Shotcrete containing Batimix Fly Ash may be applied in the same manner as conventional dry mix shotcrete. However, special emphasis should be given to the finishing and curing operations. Proper curing methods such as continuous moist curing or liquid compound membranes should be implemented for a minimum of 7 days.

As the level of replacement increases, the early-age strength decreases. However, long-term strength development is improved when fly ash is used and at some age the strength of the fly ash concrete will equal that of the portland cement concrete so long as sufficient curing is provided.

Effect of Overdosing

An overdose of Batimix Fly Ash DG3-P will result in a highly sticky and viscous mortar with significantly reduced workability. This likely leads to greater amounts of superplasticizer for a given workability, which in turn, may lead to significant set retardation. Furthermore, the mortar may become difficult to finish requiring special finishing and curing procedures.

Compatibility

Batimix Fly Ash DG3-P is compatible with all other Batimix admixtures incorporated in the same mortar. Mixtures based on Portland cement with or without replacement materials such as slica fume and blast furnace slag are also fully compatible with Batimix Fly Ash DG3-P.

DISPENSING

Batimix Fly Ash DG3-P is introduced in the mortar in a similar manner and at the same time as Portland cement or any other cementitious material such as silica fume or blast furnace slag. Because of its ultra-fine particles, the mixing time should generally be increased to ensure effective dispersion throughout the mass mortar.

Technical Support

Holderchem provides, upon request, technical advisory services pertaining to mix design, admixture selection, and materials evaluation.

Storage

Batimix Fly Ash DG3-P has a minimum shelf life of 12 months if kept unopened and stored at temperatures ranging from 2 to 50 ºC.

Packages

• 50 kg paper bag
• 25 kg paper bag