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1. Direct addition to asphalt: The warm mix agent is added before or during asphalt heating and then mixed into the asphalt. For example, organic viscosity-reducing warm mix agents (such as Fischer-Tropsch wax) must be mixed with asphalt at 160-170°C (see “Technical Specifications for Highway Asphalt Pavement Construction” JTG F40-2004).
2. Even mixing: The warm mix agent is added simultaneously with the asphalt mixing stage. This is commonly used in foaming warm mix technologies (such as water-based Asphalt-Min) and requires specialized equipment to achieve uniform dispersion within the mixing silo. II. Comparison of the Two Methods and Recommended Selection