Which type of asphalt is specifically used for sealing weakened plane joints in concrete pavement?

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Blown asphalt is specifically used for sealing weakened plane joints in concrete pavement due to its unique properties. It is produced through the process of blowing air through heated asphalt, which alters its characteristics by increasing its viscosity and stiffness. This makes blown asphalt particularly resistant to deformation and can effectively fill voids and cracks, providing a strong and durable sealant.

The nature of blown asphalt allows it to withstand various stresses and environmental conditions that can lead to joint deterioration, making it ideal for use in applications where strength and adherence are crucial. In sealing applications, it forms a robust bond with the surrounding concrete, effectively preventing moisture infiltration and further damage.

In contrast, conventional asphalt typically does not have the same enhanced properties needed for joint sealing, while cut-back and emulsified asphalts are more suited for applications where fluidity and ease of application are desired, such as surface treatments or paving.

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