Based on the latest research

we introduce asphalt foaming principles and their characteristics and analyze the influencing factors from macro and micro perspectives. The methods of designing foamed bitumen mixture

the optimum mixing water content

the influence of curing conditions

laboratory testing methods

mechanical characteristics

and the influencing factors of foamed bitumen mixture are discussed. We outline some new asphalt foaming technologies used in warm mix asphalt. Viewpoints regarding the development of foamed bitumen are put forward by analyzing the design and the evaluation methods of foamed bitumen mixture

the development and the selection of asphalt foaming additive

the improvement of the manufacture techniques of foamed asphalt

and the technology of modified asphalt foaming.