In this article, researchers explore how polyphosphoric acid (PPA) modifies emulsified asphalt to enhance stability, flexibility, and temperature performance. Dive into the science behind stronger, more stable roads and why 1.0% PPA might be the magic number.

From Kentucky’s legislative shake-up to Ohio’s successful micro surfacing trial and Charleston County’s cutting-edge strategies, there’s no shortage of innovation. We also spotlight a 30-year review that shows how micro surfacing continues to evolve as a smart, sustainable solution.

In this edition of Let’s Get Technical , we’re taking a trip down memory lane. Enjoy these blasts from the past, some of which are surprisingly still relevant today. And if you make it to the final review, let us know: has Oregon made any moves on rubber modified chip seals? Inquiring minds are watching the road ahead.

In this edition of AEMA Let's Get Technical, researchers highlight practical field tests for chip seal adhesion and explore the Breaking Index as a more versatile alternative to traditional demulsibility. New rheological methods using DSR technology offer improved quality control for chip seal emulsions. Electrokinetic techniques like zeta potential provide deeper insights into emulsion stability. These innovations reflect a growing shift toward performance-based testing in asphalt emulsion technology.