Phase　change　materials　(PCMs)　and　rubber　particles　from　recycled　tires　were　used　in　portland　cement　mortar　with　a　potential　application　as　insulation　mortar.　Series　of　tests　were　designed　and　conducted　including　compressive　strength,　flexural　strength,　thermal　conductivity,　drying　shrinkage,　and　bond　strength　tests　at　7　days　and　28　days　of　age.　Different　types　of　additives　were　also　used　in　the　mix　designs.　The　experimental　results　showed　that　mechanical　properties　of　rubberized-mortar　can　be　improved　by　adjusting　the　size　of　rubber　particles　and　the　amount　of　additives.　With　the　same　volume　fraction　of　PCM　and　rubbers,　the　mechanical　properties　of　PCM-modified　mortar　are　either　the　same　or　better　than　that　of　rubberized-mortar.　In　terms　of　thermal　properties,　the　rubber　particles　can　reduce　thermal　conductivity　of　the　mortar　significantly,　while　the　PCM　can　improve　heat　capacity　of　the　mortar.　(C)　2011　Elsevier　Ltd.　All　rights　reserved.