The study looked at how using a compression casting technique affects how much water recycled concrete absorbs. They used low-grade recycled concrete to make masonry units. By testing how fast water is absorbed, they found that the compression casting technique improved the water absorption properties of the recycled concrete. However, the recycled concrete still absorbed more water than natural aggregate concrete. They also found that the depth of salt penetration was greater in the recycled concrete. The researchers came up with equations to predict how much water the recycled concrete would absorb based on how it was made.