This　paper　investigates　the　influence　of　triethanolamine　(TEA)　on　strength　development　and　hydration　of　cement　pastes　and　mortars　incorporated　with　titanium　slag　(50%　by　mass　of　the　total　cementitious　materials).　The　techniques　including　isothermal　calorimetry,　non-evaporative　water　content,　and　mercury　intrusion　porosimetry　(MIP)　were　employed　to　characterize　the　hydration　process　at　varied　ages.　The　results　show　that:　1)　0.01%~0.10%　addition　of　TEA　has　a　positive　effect　on　the　strength　development　of　blended　cement　mortars　with　titanium　slag　indicated　by　improved　compressive　strength　and　tensile　strength;　2)　TEA　leads　to　an　increase　of　hydration　degree　determined　by　measurement　of　isothermal　calorimetry　and　non-evaporable　water　content　before　28　d;　3)　the　cumulative　porosity　of　cement　pastes　incorporated　with　titanium　slag　was　reduced　by　TEA.　Therefore,　0.01%~0.10%　addition　of　TEA　promotes　the　hydration　of　titanium　slag,　then　forming　more　condensed　structures,　thus　enhance　the　strength　development　of　blended　systems.　©　2017　Trans　Tech　Publications,　Switzerland.