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Without proper soil compaction, many concrete structures are doomed to perform poorly. Cracked pavements or floors, leaking concrete basements, and settled foundations are just a few of the problems caused by inadequate soil compaction. The goal of compaction is straightforward — pack as many soil solids as possible into a given space. Increasing the concentration of solids makes the soil stronger, less permeable, and less likely to settle excessively. Achieving those goals requires an understanding of three interrelated factors that affect the degree to which a soil can be compacted: soil type, soil moisture content during compaction, and the kind of compaction equipment used. It also requires an ability to measure the results, so