Batimix Ret WG2-L

Description

BATIMIX Ret WG2-L is a synthetically produced set-retarding admixture for shotcrete based on selected gluconate modified organic polymers. It does not contain any corroding ingredient that could potentially attack steel, aluminum, or zinc embedments.

Main Purpose

BATIMIX Ret WG2-L delays concrete setting necessary for placing and finishing operations, particularly in hot climates. It is used to transport shotcrete over long distances or cope with delivery schedules lengthened by traffic jams.

BATIMIX Ret WG2-L extends concrete setting times, essential to eliminate cold joints between adjacent shotcrete layers in large pours. It also helps avoid concrete hardening because of slow casting rates.

Features

Shotcrete prepared with BATIMIX Ret WG2-L is characterized by the following:

In the plastic state:

• Prolonged and controlled rates of setting
• Reduced cold joints or other discontinuities
• Improved slump retention and finishing times

In the hardened state:

• Reduced water permeability and cracking
• Non-staining and better surface appearance
• Improved shotcrete durability

Properties

• Appearance : brown liquid
• Specific gravity : 1.105 ± 0.02 at 23 ºC
• Chloride content: nil
• Air entrainment : typically less than 0.45% at normal dosages
• Alkali content: typically less than 2.2% as Na₂O

Health and Safety

BATIMIX Ret WG2-L 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 Ret WG2-L complies with ASTM C 1141 requirements for Type II (wet mix shotcrete), Grade 2, Class A (liquid).

Dosage Rates

The optimum dosage of BATIMIX Ret WG2-L on slump retention, setting times, and hardening is best determined by trials using the actual shotcrete formulation with site materials under conditions that will be experienced in the field. As a guide to such trials, the addition rates shall vary from 0.2% to 1.0% of the cementitious materials. Dosages outside the specified range may also be used if necessary to meet particular mix requirements.

It is to be noted that the free water content should be reduced when designing shotcrete mixes with BATIMIX Ret WG2-L to maintain similar W/C.

Effect of Overdosing

An overdose of BATIMIX Ret WG2-L will produce a slight increase in shotcrete workability with significantly higher slump retention and setting retardation as compared to that normally obtained. However, if the shotcrete is properly cured, the ultimate strength will not be impaired by such setting retardation.

Compatibility

BATIMIX Ret WG2-L is compatible with all other Batimix admixtures incorporated in the same shotcrete. During batching, all admixtures should be added separately to the shotcrete mix as this may alter their performances. BATIMIX Ret WG2-L is compatible with all types of Portland cement and replacement materials such as silica fume, fly ash, and blast furnace slag.

Dispensing

Automatic dispensing systems should preferably be used to introduce the correct quantity of BATIMIX Ret WG2-L in the shotcrete mixer. This admixture should not be directly introduced on the dry cement. It should rather be added after incorporating around 2/3 of the mixing water, and in any case prior to introducing other chemicals such as water reducers.

Technical Support

For proper products usage, Holderchemprovides complete technical and laboratory support as well as on-site assistance pertaining to concrete mix design, admixture selection, materials testing, and dispensing equipment.

Storage

BATIMIX Ret WG2-L 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 metallic drum
• 20 kg metallic pail
• 4 kg metallic pail