What is the purpose of using a density gauge in aggregate base testing?

Using a density gauge in aggregate base testing is primarily aimed at measuring the in-place density of compacted aggregates. This measurement is crucial because it helps determine whether the aggregate layer has been compacted to the required specifications, which affects the overall structural integrity and stability of the pavement or base layer.

Accurate in-place density measurements indicate that the compaction process has achieved the desired density, ensuring that the material can withstand loads effectively without excessive settlement or deformation. This contributes to the longevity and performance of the constructed pavement.

Other options relate to different properties of the aggregate but do not pertain to the primary function of a density gauge in this context. For instance, calculating porosity involves assessing the void spaces within the aggregate, which is not the main focus when using a density gauge. Similarly, determining the natural moisture content and assessing temperature are specific evaluations that require different methods and instruments, highlighting the specialized role of density gauges in measuring compacted density specifically.