Tests on basic properties of intrusion mortar and prepacked concrete using alumina cement were conducted. Items of intrusion mortar were tested for flowability, bleeding, expansion and setting time. The relationship between water cement ratio W/(C+F) and compressive strength, and the relationship between curing ages and fully converted strength were also studied. The influences of concrete admixtures, inclusive of powdered aluminum and burnt plaster, were also considered.
　Relating to prepacked concrete using alumina cement, the phenomenon of heat generation caused by rapid hardening was observed. The areas of major interest studied were fully converted strength of specimens cured in hot water of 50°C, and properties of compressive strength affected with water cement ratio W/(C+F) and powdered aluminum under natural curing condition. Also investigated was the infulence of the sea water on the strength of concrete when it was used as mixing water of intrusion mortar or as pore water of coarse aggregate.