What is the required mixing temperature for 60-70 penetration grade asphalt and the aggregates?

The required mixing temperature for 60-70 penetration grade asphalt and the aggregates falls within the range of 135°C to 163°C. This temperature range is essential because it allows for the proper blending of the asphalt with aggregates, ensuring that the asphalt binder is sufficiently fluid to coat the aggregate particles effectively. At these temperatures, the viscosity of the asphalt is reduced, which helps in achieving a homogeneous mixture that promotes optimal performance properties once the pavement is laid.

Mixing at temperatures lower than this could result in poor coating of the aggregate, leading to inadequate bonding and potentially affecting the durability and performance of the asphalt pavement. Conversely, mixing at excessively high temperatures might degrade the asphalt binder, leading to loss of properties and compromising the overall integrity of the mixture.

The specific range provided in the correct response is aligned with industry standards for asphalt production, emphasizing the importance of precise temperature control in achieving high-quality asphalt mixtures for road construction.