Warm-mix Additive




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Introduction


Hot-mix road construction contributes considerably in global warming and increased gaseous emissions. Hence the new focus for road industry is to lower its emissions by reducing the mixing and compaction temperatures of the bituminous mixtures without affecting the properties of the paving mix.

Warm mix additives are chemicals used to reduce the mixing and compaction temperatures. A significant reduction of required heat can be achieved in most cases.


Even though there are water based warm mix additives available which facilitate low temperature compaction by inducing foaming of hot bitumen, they have inherent problem of escalated water damage to prepared pavements. The other class of amine based warm mix additives provide non-foaming characteristics to prepared bitumen and asphaltic mixtures and in addition provide protection from water damage (Anti-stripping effect). Hence Amine based warm mix additives are preferred over others.

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Details


Physical properties:
Yellowish White flakes and powder at room temperature with characteristic fatty odour, Insoluble in cold water but miscible with petroleum solvents. Improves flow properties of bitumen. No significant effect on bitumen properties. Does not contain water so does not create foaming in bitumen. No additional anti-stripping agent is required in warmmixes made using WETBOND-WMA.

Uses :
Dry additive for Warm-Mix Asphalt / PMB.

Typical Dose :
For Warm-mix Asphalt: 1.0 2.0% w/w of Bitumen.


Storage and handling :
WETBOND-WMA can be stored in Airtight Bags or Carboys. Avoid storage above 50°C as this can cause agglomeration. Minimum exposure to air is the key for long storage stability. WETBOND-WMA contains amines and may cause irritation or burns to the skin and eyes. Protective goggles and gloves must be worn during handling of this product.

Chemical properties :
Chemical Name: Fortified Fatty polyamine
Flash Point: >150℃
Melting Point: >55℃
Density: ~0.885
Water Content: 1% max.

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Warm-mix Additive

WETBOND-WMA

  • Available in 25 Kg. LDPE Lined Paper Coated HDPE Bags.

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