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Nit (LAF) C

DESCRIPTION:

AT-NIT (LAF) C is an alkali-free, shotcrete admixture in liquid form for application of spraying concrete.

APPLICATION:

  • AT-NIT (LAF) C is suitable for the application as accelerator for setting in the dry process of spray as well as the wet process of spraying. The main application of AT-NIT (LAF) C is in the following areas:
    • Safety of propulsion, rock and slope safety, high volume spraying concrete for construction.

EFFECT:

  • The effect of the accelerator on setting time is dependent on the content of cement, age of cement, temperature inside the tunnel, process of spraying etc.

ADVANTAGES:

  • Fast setting times and high early strength
  • High final compressive strength development after 28 days and excellent long-term durability.
  • High early strength allows for spraying in thicker layers.
  • Factory controlled quality formula, tailor made for high temperature and high humidity application environments.
  • Very low dust production during application ensures safer working environment.
  • Rock support in tunnels and mines
  • Slope stabilization
  • TBM tunnel linings / backfilling
  • Soil stabilization in poor ground conditions

DOSAGE:

  • The entire dosing is to be ascertained in pre-trial. For strengthening of the layer (or coating) up to approx 15 cm. In case of single charge, it is in the range of 3% to 10% of the content of binding agent. The dosing of AT-NIT (LAF) C is followed by a pump of crush (or squeeze) hose e.g. Aliva Al-403. An optimal nozzle and mixing must be guaranteed with the quality of demand.

APPLICATION TEMPERATURE:

  • For shooting a thicker layer particularly on to the crown, the temperature should not be less than15°C.

IMPORTANT INSTRUCTION:

  • Before the dispensing of AT-NIT (LAF) C in spraying machine, please note that all the hoses and dispensing tank should be thoroughly cleaned and make sure that normal sodium silicate based liquid accelerator is not present.

TECHNICAL DATA:

FORM Suspension
COLOUR Beige
SPECIFIC GRAVITY (AT 25ºC) 1.43±0.03
pH 2.5 ± 0.5
ALKALI CONTENT <1%
CHLORIDE CONTENT <0.1%
INITIAL SET < 2min
FINAL SET < 12min

(All technical data stated herein is based on tests carried out under laboratory condition)

PACKAGING & STORAGE:

  • AT-NIT (LAF) C is available in the following pack:
    • 275 kg barrel
  • Shelf life is 6 months in sealed containers as provided (temperature between +5°C and +35°C)
  • Keep containers sealed and away from heat and cold in a well ventilated area

HEALTH & SAFETY:

  • Use goggles, mask, nose cover and hand gloves during application.
  • Clean hands with warm soap water after application.
  • Avoid contact with skin / eyes.
  • In case of unlikely contact with eyes, rinse immediately with plenty of clean water, then cleanse with soap and lukewarm water and seek medical advice.
  • Do not use solvent to clean the contacted area.
  • Ensure adequate ventilation and avoid inhalation of vapours as some people are sensitive to resins, hardeners and solvents.
  • If swallowed seek medical attention immediately. Do not induce vomiting.
  • Store in well-labeled containers.