The Light Compaction Test, also known as the Standard Proctor Test, is a laboratory method used to determine the relationship between soil moisture content and dry density. It identifies the Optimum Moisture Content (OMC) and Maximum Dry Density (MDD) under standardized compaction energy.
In standard civil projects, achieving the Maximum Dry Density is critical to structural performance. The Light Compaction test mimics the energy provided by standard rollers on-site. As water is added to the soil, it acts as a lubricant, allowing particles to pack closer together until the OMC is reached.
Adding water beyond the OMC actually reduces density as water begins to displace the soil solids. Our laboratory provides the precise "Peak" data needed to ensure that site contractors are compacting soil within the allowable moisture range to prevent future softening or excessive settlement under the foundation load.