Asphalt gets its name from the primary binding agent used in the mixture.
Prior to 9/11, buildings were designed with defenses against total destruction. There was little known or understood, however, about progressive collapse. This is when primary structures are affected or destroyed, resulting in weakness of adjoining structures.
In the years since 9/11, it’s with an intense focus on reducing likelihood and/or severity of progressive collapse that engineers have identified the two methods explained in this article >> https://dailyreporter.com/2018/09/11/how-building-design-changed-after-911/