Recycled asphaltic concrete mixtures

Figure II. Comparison of initial bending strain for sulfur-recycled, conventional recycled, and conventional asphaltic concrete mixtures...

Research on the use of crumb rubber in asphalt paving needs to be intensified and brought to a conclusion. Research on newer forms of rubber and asphalt mixtures, some without patent protection (thus available at lower cost), needs to be continued. Research on how asphalt-rubber and rubber modified asphalt concrete can best be recycled should be performed. 

A major contribution to the above concerns is re-using or recycling the materials of old pavements, such as asphalt mixtures (asphalts), concrete or base/sub-base material. 

Waste tires are a significant health and environmental concern if they are not recycled or discarded properly. Over the years, recycling waste tires into civil engineering applications, especially into asphalt paving mixtures and Portland cement concrete, has been gaining more and more interest (54). 

In comparison with its use in asphalt paving mixtures, the recycling of waste rubber in Portland cement concrete has not been so successful due to two factors (54) ... 

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