To　investigate　the　impact　of　fly　ash　size　and　content　on　power　consumption　and　carbon　emissions,　an　analysis　was　conducted　to　assess　their　influence　on　the　optimal　asphalt　content.　The　study　employed　the　quota　method　and　carbon　emissions　factor　method　to　evaluate　carbon　emissions　and　power　consumption.　Carbon　emissions　were　calculated　for　mixtures　with　varying　bottom　ash　ratios.　The　findings　indicate　that　the　size　and　content　of　ash　can　affect　carbon　emissions　during　the　production　stage,　primarily　through　the　release　of　carbon　dioxide.　As　the　ash　content　increased,　production　power　consumption　gradually　decreased,　leading　to　a　decline　in　carbon　emissions.　The　influence　of　ash　particle　size　was　found　to　be　dependent　on　its　content.　For　ash　contents　below　or　equal　to　20%,　larger　particle　size　ash　effectively　reduced　power　consumption　and　carbon　emissions.　However,　as　the　content　continued　to　increase,　ash　with　a　medium　particle　size　demonstrated　better　carbon　benefits.　These　research　findings　can　be　a　significant　guidance　for　asphalt　pavement　design　and　serve　as　a　valuable　reference　for　controlling　carbon　emissions.　　©　2023　ASCE.