Infra-lightweight　concrete　(ILC)　is　an　efficient　alternative　of　normal　concrete　(NC)　for　structural　applications　with　low　strength　but　high　thermal　performance　requirements.　Three　types　of　ILCs　with　dry　densities　600,　700　and　800　kg/m(3)　have　been　manufactured　by　using　high　water　to　cement　ratio　(w/c)　and　expanded　clay　lightweight　aggregates　(ECLAs).　Experimental　studies　showed　that　shrinkage　strains　in　ILCs　can　be　up-to　1.51　mm/m　as　compared　to　0.2-0.8　mm/m　for　NCs,　which　affects　the　structural　durability　of　ILCs.　To　control　shrinkage　strains　of　ILCs,　ILCs　have　been　then　reinforced　with　two　types　of　fiber　reinforced　polymers　(FRPs):　carbon　fiber　reinforced　polymer　(CFRP)　and　glass　fiber　reinforced　polymer　(GFRP).　For　each　type　of　FRP,　two　different　grid　arrangements　of　size　21　x　21　mm　and　25　x　25　mm　have　been　used.　Although　all　FRP　grid　reinforcements　are　effective　as　they　reduced　the　shrinkage　strains　significantly　and　close　to　the　shrinkage　strains　of　NCs,　CFRP　reinforcement　with　25　x　25　mm　grid　is　most　effective　as　it　reduced　the　shrinkage　strains　up-to　the　maximum　level.　Also,　experimental　shrinkage　strains　have　been　compared　with　five　commonly　used　prediction　models　and　it　has　been　found　that　each　model　failed　to　accurately　predict　the　shrinkage　strains.　Therefore,　a　new　prediction　model　has　been　developed　by　modifying　one　of　the　existing　model　i.e.　B3　model　for　shrinkage　prediction　of　ILC　which　considers　the　effect　of　water　content,　compressive　strength　and　dry　density.　Another　prediction　model　for　FRP　reinforced　ILCs　has　also　been　developed　to　incorporate　the　influence　of　any　type　of　reinforcement　in　ILC.　A　comparison　of　modified　prediction　models　with　experimental　results　has　shown　that　the　models　can　predict　shrinkage　accurately　and　can　be　utilized　for　normal　ILCs　as　well　as　reinforced　ILCs.　(C)　2020　Elsevier　Ltd.　All　rights　reserved.