Asphalt Pavement Modifiers

by Jon Epps, Prof. and Chrmn.; Civ. Engrg. Dept., Univ. of Nevada/Reno, Reno, NV 89557,


Serial Information: Civil Engineering—ASCE, 1986, Vol. 56, Issue 4, Pg. 56-60


Document Type: Feature article

Abstract:

Modifiers or additives to asphalt concrete pavements are being researched or marketed by many major chemical firms. Modifiers or additives are used to stiffen the asphalt in hot weather when rutting and shoving of soft asphalts are a problem. They are also used to make asphalt more flexible in very cold weather when cracking due to lower elasticity is a problem. Several classes of additives and their range of uses are reviewed. In order to get maximum benefit from asphalt pavements and modifiers, the writer believes we need improved asphalt pavement design methods, specifications, and construction procedures. Recommendations are given. Seven case histories of projects involving asphalt modifiers/additives are presented.

Subject Headings: Asphalt pavements | Chemical additives | Pavement design | Concrete pavements | Construction methods | Case studies | Asphalt concrete

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