The　total　early-Age　shrinkage　and　coefficient　of　thermal　expansion　of　concrete　were　measured　by　a　corrugated　pipe　system.　The　effects　of　prewetted　and　dry　lightweight　coarse　aggregate　(LWA)　on　the　autogenous　shrinkage　of　concrete　at　early　age　(1　day),　including　liquid　phase,　skeleton-formational　phase,　and　hardening　phase,　were　investigated　and　discussed.　It　was　confirmed　that　the　early-Age　autogenous　shrinkage　of　concrete　depends　on　the　constraint　intensity　on　the　hardening　cement　paste　(HCP)　by　coarse　aggregate　and　the　effective　water-cement　ratio　(w/c).　The　effective　w/c　has　a　much　stronger　influence　during　the　liquid　phase　than　other　two　phases;　however,　the　constraint　imposed　by　coarse　aggregate　becomes　the　dominant　factor　during　the　skeleton-formational　phase.　During　the　hardening　phase,　concrete　made　with　prewetted　LWA　expands;　at　the　same　time,　the　chemical　shrinkage　and　self-desiccation　are　insignificant.　Copyright　©　2015,　American　Concrete.