The ASTM D6154-15 (2021) e1 standard specification specifies requirements for chemically modified asphalt cement for use in pavement construction. The standard details the composition, performance and test methods of chemically modified asphalt cement to ensure that its application in pavement construction provides the required durability, resilience and anti-aging performance. Chemically modified asphalt cement improves the performance of traditional asphalt by adding chemical Pellicular packing, thereby increasing the service life and driving comfort of the road. The standard is applicable to all types of pavement construction projects, especially those requiring high durability and high load bearing capacity, and helps guide the procurement, quality control and construction process of asphalt cement.