Asphalt Concrete Warm Mix Agent Application Guidelines
Warm mix agents enable cooler application by reducing asphalt viscosity, reducing asphalt mixture production temperatures by 20-30°C (NATC data). Key types include organic viscosity reducers (such as Fischer-Tropsch wax, at a 0.3%-0.5% addition rate), foaming agents (at a 2%-3% addition rate), and chemical surfactants (such as Evotherm, at a 0.5%-0.8% addition rate). Selection should consider climatic conditions and cost budgets. Strict temperature control is required during application: mixing temperature 120-140°C, paving temperature ≥ 110°C, and initial compaction temperature ≥ 100°C (JTG F40-2004 specification). Mixture production should ensure a dry mix time of 5 seconds and a wet mix time of 30 seconds. Transport should be covered with a blanket, and transport distances should be ≤ 1 hour. The paving speed is 2-4 m/min, the loose paving coefficient is 1.15-1.20, and compaction is performed using a double-drum roller (two static passes and four vibratory passes). The final compaction temperature is ≥80°C. Warm-mix technology can reduce fuel consumption by 15%-20% and CO? emissions by 30%. A 10-kilometer, two-way, four-lane project is expected to save approximately 50 tons of diesel and reduce costs by 8%-12%.
Warm mix agents enable cooler application by reducing asphalt viscosity, reducing asphalt mixture production temperatures by 20-30°C (NATC data). Key types include organic viscosity reducers (such as Fischer-Tropsch wax, at a 0.3%-0.5% addition rate), foaming agents (at a 2%-3% addition rate), and chemical surfactants (such as Evotherm, at a 0.5%-0.8% addition rate). Selection should consider climatic conditions and cost budgets. Strict temperature control is required during application: mixing temperature 120-140°C, paving temperature ≥ 110°C, and initial compaction temperature ≥ 100°C (JTG F40-2004 specification). Mixture production should ensure a dry mix time of 5 seconds and a wet mix time of 30 seconds. Transport should be covered with a blanket, and transport distances should be ≤ 1 hour. The paving speed is 2-4 m/min, the loose paving coefficient is 1.15-1.20, and compaction is performed using a double-drum roller (two static passes and four vibratory passes). The final compaction temperature is ≥80°C. Warm-mix technology can reduce fuel consumption by 15%-20% and CO? emissions by 30%. A 10-kilometer, two-way, four-lane project is expected to save approximately 50 tons of diesel and reduce costs by 8%-12%.
