Single Additive for Recycling Asphalt Pavements

by Donald D. Davidson, Vice Pres.; Witco Chemical Corp., Bakersfield, Calif.,
Steven J. Escobar, Asphalt Group Leader; Witco Chemical Corp., Bakersfield, Calif.,
William Canessa, Manager of Product Engineer; Witco Chemical Corp., Bakersfield, Calif.,

Serial Information: Civil Engineering—ASCE, 1978, Vol. 48, Issue 12, Pg. 35-38

Document Type: Feature article


A design concept for recycling deteriorated asphalt pavements using a single reclaiming agent has been developed. The article established guidelines to help engineers determine the physical and chemical deficiencies of a particular pavement, design the proper mix with the use of a reclaiming agent, and predict the properties of the asphalt in the finished pavement. Basic guideline steps are: obtain samples representative of the pavement to be recycled; determine the gradation of aggregate in the old pavement and the amount and consistency of the aged asphalt; calculate the asphalt demand of the aggregate; and establish tolerable consistency limits for the reclaimed asphalt. Desirable properties for a suitable reclaiming agent and important construction criteria for the recycling procedure are examined. The developmental program demonstrates that reclaiming agents can be designed for use as the sole additive for recycling substandard or deteriorated asphaalt pavements.

Subject Headings: Asphalt pavements | Chemical additives | Recycling

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