China　is　a　major　agricultural　country,　emitting　a　large　amount　of　corn　cob　solid　waste　annually,　yet　its　comprehensive　utilization　rate　is　relatively　low.　Corn　cobs　have　a　lower　thermal　conductivity　and　can　be　used　as　natural　insulation　materials　in　concrete　blocks.　However,　due　to　the　porous　structure　of　corn　cobs,　the　compressive　strength　of　corn　cob　aggregate　concrete　is　relatively　low　and　urgently　requires　modification.　In　order　to　promote　the　scaled　utilization　of　corn　cob　and　use　them　to　improve　the　properties　of　concrete　blocks,　this　study　explored　the　effects　of　three　different　modification　techniques,　such　as　epoxy　resin　modification,　the　modification　methods　of　ceramide　and　coating,　on　the　chemical　bond　and　molecular　structure　of　hydration　products,　microstructure　of　interfacial　transition　zone,　compressive　strength　and　thermal　conductivity　of　corn　cob　aggregate　concrete　by　infrared　spectroscopy,　Raman　spectroscopy,　and　scanning　electron　microscopy.　The　results　showed　that　compared　with　epoxy　resin　modification,　the　modification　methods　of　ceramide　and　coating　not　only　increased　the　content　of　calcium　silicate　hydrate　gel　in　the　interfacial　transition　zone　of　corn　cob　aggregate　concrete,　but　also　reduced　the　thickness　of　interfacial　transition　zone,　optimized　its　microstructure,　improved　the　compressive　strength,　and　reduced　the　thermal　conductivity　of　concrete　blocks.　Among　them,　the　effect　of　ceramide　modification　method　is　particularly　significant.　The　order　of　characteristic　peak　of　calcium　silicate　hydrate　gel　in　the　interface　transition　zone　was　the　modification　methods　of　ceramide,　the　modification　methods　of　coating,　epoxy　resin　modification.　After　ceramide　modification,　coating　modification,　and　epoxy　resin　modification,　the　thickness　of　the　interfacial　transition　zones　of　the　corn　cob　aggregate　concrete　were　no　distinct　interfacial　transition　zone,　between　55～　66　μm,　and　between　93～　101　μm,　respectively.　Compared　with　concrete　with　original　corn　cob　aggregate,　the　thermal　conductivity　and　compressive　strength　of　concrete　with　30%　ceramide　method　modificated　corn　cob　aggregate　decreased　by　51.5%　and　32.2%,　respectively.　When　the　proportion　of　modified　corn　cob　aggregate　did　not　exceed　15%,　the　concrete　blocks　met　the　national　standards　MU20～MU30　for　compressive　strength.　To　improve　the　overall　performance　of　corn　cob　aggregate　concrete　blocks,　it　is　recommended　to　incorporate　no　more　than　15%　of　corn　cob　aggregate　with　ceramide　modification　method.　This　research　provides　a　theoretical　basis　for　the　large-scale　utilization　of　corn　cobs　in　concrete　blocks,　and　provides　a　reference　for　the　further　improvement　of　the　relevant　properties　of　concrete　blocks.　©　2024　Chinese　Society　of　Agricultural　Engineering.　All　rights　reserved.