Compaction of concrete allows the concrete to reach its full potential quality. Compaction is a two-stage process where the vibrations effect first fills the mould due to the liquefaction, and second, the vibrations repulse the entrapped air from the concrete. The purpose of the Compact Air project was to determine possibilities to reduce the amount of compaction pores and reduce the risk of segregation. Firstly, the samples from the project "Good Vibrations" were analysed using combination of capillary suction, pressure saturation, and digital image analysis methods. These three methods were also applied on normal production concrete structures, from which drilled cores where vertically extracted. Secondly, test structures were cast to exa...