Question
Download Solution PDFWhich of the following type of asphalt is better suited for surface sealing and dust control in flexible pavements?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFExplanation:
- Emulsified Asphalt: Emulsified asphalt is a mixture of asphalt cement, water, and an emulsifying agent. It is particularly well-suited for surface sealing and dust control in flexible pavements.
- The water-based nature of emulsified asphalt allows it to be applied at lower temperatures and easily spread over the pavement surface.
- Once the water evaporates, it leaves behind a thin film of asphalt that seals the surface and controls dust. This type of asphalt is environmentally friendly and safer to use compared to cutbacks.
Additional Information
- Hot Mix Asphalt: Hot mix asphalt (HMA) is typically used for paving and resurfacing roads. It requires high temperatures for mixing and application, which makes it unsuitable for the purpose of surface sealing.
- Cutback Asphalt: Cutback asphalt is asphalt cement that has been liquefied by blending with petroleum solvents. While it can be used for surface treatments, its use is less preferred due to environmental concerns related to the evaporation of the solvents, which can release volatile organic compounds (VOCs) into the atmosphere.
- Cold Mix Asphalt: Cold mix asphalt is used for patching and minor repairs. It is made by mixing asphalt emulsion or cutback asphalt with aggregates at ambient temperature.
Last updated on May 28, 2025
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