Accurate and timely moisture measurement of soils, aggregates, and recycled materials is critical to properly compacting these materials. There are numerous methods for measuring the moisture content of the soil; some are laboratory-based, and some are done in-situ. The objective of this synthesis is to document state department of transportation (DOT) practices for field and laboratory moisture measurement for pavement foundations and slopes.

Information for this study was gathered through a literature review, a survey of state DOTs, and follow-up interviews with selected DOTs. Case examples of three state DOTs provide additional information on practices for moisture measurement.

Claudia Zapata and Saleh Alothman, Arizona State University, collected and synthesized the information and wrote the report. The members of the topic panel are acknowledged on page iv. This synthesis is an immediately useful document that records practices that were acceptable within the limitations of the knowledge available at the time of its preparation. As progress in research and practice continues, new knowledge will be added to that now at hand.

Completed report can be found at NCHRP Synthesis Report 612.