Thirteen　specimens　were　tested　out　of　which　nine　were　for　creep　of　sealed　concrete　and　four　for　shrinkage　test,　for　a　period　of　700　d　under　controlled　temperature　condition.　The　experimental　results　for　creep　and　shrinkage　were　compared　with　creep　and　shrinkage　computation　model　B3　and　distinct　discrepancies　between　observed　and　calculated　creep　and　shrinkage　strains　were　observed.　Based　on　regression　analysis,　modification　on　B3　model　has　been　formulated　which　will　be　applicable　at　least　for　concrete　of　characteristics　strength　of　C40　and　C50　with　additives.　Besides,　on　the　basis　of　observation　on　identical　specimens　with　varied　stress　strength　ratio,　a　function　is　generated　which　accounts　effect　of　stress　strength　ratio　on　creep.　Finally,　Civil　Engineering　community　is　suggested　not　to　follow　the　creep　prediction　models　without　correction　at　least　for　modern　concrete,　as　they　do　not　account　the　effect　of　additives　on　its　compliance　function.