A　novel　approach　was　devised　to　synthesize　a　sustainable　hydraulic　cement　based　on　alkali　aluminosilicate　chemistry　via　mechanochemical　activation.　This　approach　builds　upon　past　work　on　activation　of　aluminosilicate　precursors　using　alkaline　solutions　to　produce　inorganic　binders　for　concrete　construction.　Recent　efforts　to　develop　one-part　hydraulic　cements　based　on　the　chemistry　of　alkali-activated　aluminosilicates　have　resorted　to　high-temperature　processing　techniques　which　compromise　the　sustainability　advantages　of　the　system,　and　also　require　curing　at　elevated　temperatures.　The　mechanochemical　process　developed　here　takes　place　at　room　temperature,　and　yields　a　hydraulic　cement　that　does　not　require　addition　of　caustic　solutions　to　render　binding　effects　via　room-temperature　curing.　Processing　of　this　hydraulic　cement　takes　place　at　room　temperature;　this　advantage　together　with　extensive　use　of　recycled　raw　materials　yield　significant　sustainability　benefits.　The　(dry)　raw　materials　used　for　mechanochemical　processing　of　hydraulic　cement　included　coal　fly　ash,　quick　lime,　sodium　hydroxide　and　Magnesium　oxide.　The　mechanochemically　processed　hydraulic　cement　was　evaluated　through　performance　of　tests　concerned　with　their　pH,　heat　of　hydration,　chemical　composition,　crystallinity　and　microstructure.　The　hydraulic　cement　was　used　to　produce　concrete　materials　cured　at　room　temperature.　The　resulting　concrete　materials　were　found　to　provide　desired　levels　of　workability　in　fresh　state　and　compressive　strength　after　curing,　which　were　comparable　to　those　of　Portland　cement　concrete.　Investigations　were　also　conducted　on　the　hydration　kinetics　of　the　hydraulic　cement　and　the　microstructure　of　its　hydrates　in　order　to　gain　insight　into　its　hydration　process　and　the　nature　of　hydration　products.　©　2016,　RILEM.