Two　modified　Mg-Al　hydrotalcites　(MHTs),　(MHT-pAB　and　MHT-NO2)　were　incorporated　into　mortar　(with　different　w/c　ratios)　in　two　different　ways:　(1)　as　one　of　the　mixing　components　in　bulk　mortar;　(2)　as　part　of　cement　paste　coating　of　the　reinforcing　steel.　Accelerated　chloride　migration,　cyclic　wetting-drying　and　diffusion　tests　were　performed　to　investigate　their　effect　on　reinforcement　corrosion.　The　results　indicated　that　MHTs　could　be　promising　alternatives　for　preventing　chloride-induced　corrosion　when　an　appropriate　dosage　is　adopted　and　applied　in　a　proper　way,　particularly,　replacing　5%　mass　of　cement　by　MHT-pAB　in　bulk　mortar　or　as　a　coating　of　reinforcing　steel　(MHT-pAB/MHT-NO2　to　replace　20%　mass　of　cement).　The　effect　of　MHT-pAB　on　time-to-corrosion　initiation　(TTC)　of　reinforcing　steel　was　estimated　using　the　DuraCrete　model.　It　was　found　that　the　incorporation　of　5%　MHT-pAB　in　bulk　mortar　led　to　a　more　than　double　TTC　relative　to　reference　mortar　without　MHTs.