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Damages must be confined to the surface course in order to be suitable for rehabilitation by hot recycling. When that is the case, hot recycling can be an excellent remedy for a broad variety of surface damages. The following are examples of typical damage patterns that are suitable for rehabilitation by hot recycling.
Damages occurring as longitudinal or transverse ruts are caused by a lack of stability in the surface course layer. Likely reasons are that the binding agent is too soft, the binder content too high, or that there is a lack of coarse aggregate. Hot recycling solves these problems by adding corrective mix containing hard binding agents or a high proportion of coarse-grained high-quality chippings.
When the binder content is too high, the road pavement becomes slippery – especially in wet weather. The grip of pavements can also be adversely affected by an insufficient percentage of crushed sand. If that is the case, corrective mix containing high-quality, polish-resistant chippings or a high percentage of crushed sand is usually added to the recycling process.
Further applications of hot recycling include roads which have quite simply succumbed to the ravages of time. High loads of traffic result in a gradual loss of material in the smallest aggregate fractions, namely chippings and sand. Hot recycling remedies these signs of wear and tear by adding supplementary mix of the lacking aggregate fraction.
Cracking occurs in the surface course of a road when the pavement becomes brittle or hard, the causes being the use of wrong binding agents, poor bond between layers, or inadequate thickness of the surface course. Adding soft binding agents to the hot recycling process protects the new surface course from recurring cracking in the medium term.
