This paper presents the reuslts of the theoretical and experimental studies on the methods of test for properties of intrusion mortar for prepacked concrete, so called preplaced aggregate concrete. It is considered significant to clarify the properties through some test methods, since the intrusion mortar is one of the most important factors to obtain relialble quality concrete. So far the present practice of prepacked concrete in our country is concerned, the general methods of test are those on the filuidity, bleeding, and expansion of the mortar and the one on compressive strength of prepacked concrete. It seems quite necessary to develop certain types of test methods and standardize them to obtain sufficient informations on the intrusion mortar and to expect effective application of prepacked concrete to underwater - concreting.
　From this point of view, the author reviewed the domestic and foreign standards or specifications on cement, mortar, concrerte, prestressed concrete grout, and intrusion mortar widely employed in the light of the test methods for fluidity, water retentiviy, bleeding, air content, time of setting, and strengths of intrusion mortar as well as the method of mixing of intrusion mortar for laboratory tests, and discussed them on their applicability to the standard methods of test on intrusion mortar either with or without modifications. Those successfully examined on their applicability were then subjected to laboratory tests for the examiniation on reliability and reproduceability of their test results, along with these developed by the author. Some test apparatuses were also examined and improved with the least modifications to their original patterns published.
　Summarizing the discussions and test results, the author concludes the sutdies by proposing the Recommended methods of Test on Intrusion Mortar which are stated in Appendix of the report containg the following chapters:
　1. Method of Mixing of Intrusion Mortar for Laboratory Tests,
　2. Method of Test for Fluidity,
　3. Method of Test for water Retentivity,
　4. Method of Test of Bleeding,
　5. Method of Test for Air Content,
　6. Method of Test for Time of Setting,
　7. Method of Tests for Compressive and Tensile Strengths.