Prismatic　geopolymeric　recycled　aggregate　concrete　(GRAC)specimens　with　a　height-to-width　ratio　of　3　were　prepared　for　the　quasi-static　compressive　test.　The　specimens　were　designed　with　four　different　widths　(70　mm,100　mm,150　mm,and　200　mm)and　five　distinct　RCA　replacement　rates　(0%,30%,50%,70%,and　100%)to　explore　the　influence　of　specimen　size　and　recycled　coarse　aggregate　(RCA)substitute　rate　on　the　compressive　strength　dispersion　of　GRAC.　A　predictive　formula　for　the　average　compressive　strength　of　different　sizes　of　GRAC,considering　the　RCA　substitute　rate,was　proposed　based　on　the　classical　size　effect　law.　The　results　showed　that　the　compressive　strength　dispersion　of　GRAC　decreased　with　an　increase　of　specimen　width.　Furthermore,it　was　observed　that　the　compressive　strength　dispersion　of　GRAC　initially　increased　and　then　decreased　as　the　RCA　substitute　rate　increased.　Additionally,a　predictive　formula　for　the　compressive　strength　of　GRAC　with　varying　sizes　and　different　RCA　substitute　rates,considering　arbitrary　reliability　levels,was　proposed　based　on　the　Weibull　distribution　model.　©　2025　Cailiao　Daobaoshe/　Materials　Review.　All　rights　reserved.