’ve never given much thought to asphalt, besides resenting road commissions for economizing by choosing it over the vastly more durable concrete. My obvious pavement bias has inspired two Technologue columns covering novel concrete technologies aimed at strengthening roads and greening the production process. But only a scant 6 percent of our nation’s 4-million-mile road network features rigid paving (concrete), while the rest is flexible (asphalt). So it’s high time I even the score by examining some technology aiming to make asphalt both
