AASHTO MP 38-18 (2020) PDF Download

AASHTO MP 38-18 (2020) is a standard specification that provides guidelines for the mix design of cold recycled mixtures with foamed asphalt. The purpose of this standard is to establish a method for designing mixtures that utilize foamed asphalt in cold recycling processes, such as cold in-place recycling (CIR) or cold central plant recycling (CCPR).

The standard emphasizes the importance of using mixture properties to develop a job mix formula. It highlights the significance of foamed asphalt in enhancing the performance of cold recycled mixtures, including improved moisture durability and increased resistance to cracking and rutting.

The specification outlines the various steps involved in the mix design process, such as material selection, determination of optimum foamed asphalt content, compacted density determination, and evaluation of mixture properties. It also provides guidance on conducting laboratory tests to assess the compactibility, volumetric properties, and mechanical properties of the cold recycled mixtures.