Loosening Coefficients for Asphalt Mixtures Mix Type Mechanical Paving Artificial Paving Asphalt Concrete Mixture 1.15~1.35 1.25~1.45 Asphalt Gravel Mix 1.15~1.30 1.20~1.40 Working Temperatures for Hot Mix Asphalt Asphalt Type Oil Types Asphalt Marking AH-50 AH-70 AH-90 A-60 AH-110 AH-130 A-100 A-140 A-180 A-200 Asphalt Heating Temperature (°C) 150~170 140~160 130~150 Mineral Material Temperature Gap Type Mixing Machine 10~20°C higher than asphalt heating temperature (filler does not heat) Continuous Mixer 5~10°C higher than asphalt heating temperature (filler heating) Asphalt Mix Factory Normal Temperature (°C) 140~160 125~160 120~150 Mixer Storage Temperature (°C) Temperature during storage should not drop more than 10°C Transport to Site Temperature (°C) 130~150 (Winter ≥150) Paving Temperature (°C) Normal Construction Low Temperature Construction Not less than 110~130 and no more than 165 Not less than 120~140 and no more than 175 Rolling Temperature (°C) Normal Construction Low Temperature Construction 110~140 and no less than 110 120~150 and no less than 110 Rolling End Temperature (°C) Steel Roller Tire Roller Vibratory Roller Not less than 70 Not less than 80 Not less than 65 ABLE Fireplace Logs, made of light ceramic raw materials or cement materials, light weight but strong not easy to break, hand-painted, natural colors and amazing details & realistic shapes, easy turn redness in the fire, can enhance the fireplace flame, all made of inorganic materials, odorless, fire-resistant temperature >900℃, product can be used for a long time, with reasonable price. Fireplace Logs,Fire Logs,Wood Fire Stove,Artificial Fireplace Logs Yixing Able Ceramic Fibre Products Co., Ltd , https://www.ablegaslogs.com
II. How to Control the Temperature of Asphalt Concrete During Operation
Hot mix asphalt (HMA) is produced by heating aggregates and mixing them with asphalt. This process requires strict temperature control during transportation, paving, and compaction. If the temperature is too high or too low at any stage, it can negatively impact the final quality of the pavement and even result in costly rework.
The operating temperature also depends on the type of asphalt being used. Different asphalt grades have different thermal requirements. The table below provides an overview of the recommended temperatures for various asphalt types and processes.
**Notes:**
1. Construction temperature depends on the type and grade of asphalt. Thicker asphalt should be heated closer to the upper limit, while lighter asphalt can be closer to the lower limit.
2. If the asphalt mixture leaving the factory is more than 30°C above the normal temperature, it must be discarded.
Proper temperature control and accurate thickness management are essential for achieving a durable and high-quality asphalt pavement. These steps ensure that the final product meets engineering standards and performs well under traffic and environmental conditions.
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How to Master the Virtual Thickness of Asphalt Concrete Paving
When paving asphalt concrete, one of the most critical factors is controlling the thickness of the material, often referred to as the "loosening coefficient." If this factor isn't properly managed, the compacted layer may end up too thin, which can compromise the quality of the project and lead to increased costs or delays in the schedule. The loosening coefficient varies depending on the type of asphalt mixture, the construction equipment used, and the specific techniques applied. While experienced workers can rely on their judgment, it's also common to refer to standard values based on past practices. Below is a table that outlines typical loosening coefficients for different types of asphalt mixtures and paving methods.