**Author details**

Increased energy costs and strong global demand for oil have encouraged the development of alternative bonding materials to modify or replace asphalt bonding materials. The benefits of using alternative bonding materials are their ability to help conserve natural resources and

The use of alternative (or secondary) materials in asphalt mixtures may be one of the most complex methods of highway use. It is not a matter of throwing alternative materials into the mixture and coating them with cement. The best use should be designed and used, including the design of the mixture itself, and the effects of alternative materials on the behavior of the asphalt binder, and the pavement to be incorporated into it. It is necessary to know how to test the resulting mixture in order to conform to the specifications; in some cases, this knowledge

• Bio-Binder modified asphalt is capable to change rheological properties of the asphalt

• The binder test will show that the addition of bio-oils is expected to improve the rutting

• Most of the bio-oil modified asphalt mixture has higher fatigue lives than the control as-

• The addition of bio-modified asphalt with asphalt binder reduced the PG of the base binder, representing an increased resistance to thermal cracking, nevertheless reduced resis-

• The adding of bio-modified asphalt reduced the crack energy at middle temperatures when compared to unoriginal asphalt under monotonic loading, representing reduced resistance

• The dynamic modulus of hot mix asphalt (HMA) reduced with addition of bio-modified

• The flow numbers of the bio-modified asphalt HMA mixes were lower than those of unoriginal mixes. This finding indicated that bio-modified asphalt HMA mixes are more dis-

• The cracking energy reduced with addition of bio-modified asphalt in the HMA and crack work obtained from IDT testing at intermediate temperatures, indicating that the bio-modified

• Thermal cracking energy increased with addition of bio-modified asphalt in the HMA, which indicating that an improved resistance to low-temperature thermal cracking. Biomodified asphalt mixes are highly elastic even at lower temperatures than unoriginal mixes. • Overall bio-modified asphalt can be a promising applicant for low-temperature behavior. However, further modification of bio-modified asphalt for higher temperature is essential

asphalt mixes are disposed to fatigue failure as soon as compared to control HMA.

• The bio-binder will increase viscosity of the asphalt binder at high service temperature

reduce energy consumption while at the same time improving asphalt performance.

is lacking. Also, the expected finding from this chapter is as follows:

performance

14 Modified Asphalt

phalt mixture.

tance to rutting.

to fatigue cracking.

posed to rutting than unoriginal mixes.

to increase its performance against rutting.

asphalt.

binder which will improve the performance against pavement distress

Ragab Abd Eltawab Abd El-latief

Address all correspondence to: chemragab83@yahoo.com

Asphalt Lab, Petroleum Applications Department, Egyptian Petroleum Research Institute (EPRI), Cairo, Egypt
