关键词: 碱矿渣水泥;膨胀剂;限制膨胀率;水化热

Abstract: The restricted expansion rate of alkali activated slag (AAS) mortar with CaO expansive agent was studied and XRD, SEM and hydration heat were utilized to examine characteristics of hydration products of AAS mortar.The results indicate that alkali activated slag mortar 3 d compressive strength increased as the dosage of CaO expansive agent increases from 6％ to 10％, but the compressive strength after 7 d decreases and the restricted expansion rate increased .The results of hydration heat show that the expansive agent can accelerate hydration exothermic peak , while a reduced total heat and rates of hydration are observed.It is also found from the results of XRD and SEM that calcium hydroxide is the main source in alkali activated slag mortar with CaO expansive agent .This suggests that the shrinkage compensating cannot achieve an " effective compensation " due to the difference in rate of hydration between CaO agent and AAS mortar , although the CaO expansive agent has compensation effect for shrinkage.

Key words: alkali activated slag;expansive agent;restricted expansion rate;hydration heat