Phase　change　materials　melt　and　solidify　at　different　temperature　ranges　called　Phase　change　hysteresis.　This　phenomenon　should　be　understood　and　evaluated　in　order　to　adequately　design　energy　storage　concretes　for　applications.　Although　many　studies　have　analyzed　the　phase　change　process　in　pure　-　phase　change　materials　such　as　paraffin.　However,　there　is　not　enough　information　about　the　Phase　change　hysteresis　of　energy　storage　concrete.　In　order　to　realistically　reproduce　the　working　condition　of　concrete.　This　study　explores　phase　change　hysteresis　in　energy　storage　concrete　slabs,　focusing　on　the　impact　of　microcapsule　concentration　and　temperature　change　rate　on　thermal　efficiency.　Experiments　were　conducted　to　analyze　the　thermophysical　properties,　particularly　observing　the　variations　in　specific　heat　capacity　and　phase　transition　temperatures.　Results　showed　that　increasing　the　microcapsule　concentration　enhances　the　specific　heat　capacity　and　latent　heat　of　phase　change,　while　faster　temperature　changes　intensify　hysteresis　effects.　Compared　with　the　results　of　previous　studies.　Phase　change　hysteresis　is　more　significant　due　to　the　pore　and　complex　structure　of　energy　storage　concrete　that　impedes　heat　transfer.　The　experimental　latent　heat　values　were　approximately　75　%　of　theoretical　predictions,　likely　due　to　microcapsule　damage　and　microstructural　impacts　on　heat　transfer.　The　study＇s　findings　are　crucial　for　optimizing　the　thermal　performance　of　energy　storage　concrete.　©　2024　Elsevier　Ltd