About MORINO KEIJI
About IWATSUKI EIJI
About aggregate(material)
About rock
About crushed stone
About working face
About andesite
About quality inspection
About specific gravity
About water absorption rate
About strength
About alkali-aggregate reaction
About Kagawa prefecture
About Aggregates
About 砕石
About 切羽
About 骨材
About 岩石
About 性状