New standard reimagines BMD

On April 30, the Balanced Mix Design (BMD) Implementation Working Group (IWG) presented a new standard of practice to AASHTO designed to replace AASHTO PP105.

The current standard of practice provided four approaches to showcase how to design a mix for BMD. The new standard of practice focuses on how to specify BMD mixtures allowing for more flexibility in how mixes are actually designed. Moving from four approaches to three tiers, as an agency moves up the tiers, it focuses more on mechanical tests and less on constituent and volumetric properties.

For more information on why the industry needs to move from approaches to this new method, check out the short document on the IWG webpage.