It is a test of dynamic soil compaction that is performed in a laboratory of soil mechanics and that has as main purpose to obtain the maximum dry density (Kg/m3) and optimum moisture (%) of a soil for certain energy. Compaction is an important means to increase resistance and decrease the compressibility of soils, since it facilitates the arrangement of particles. Learn more about this topic with the insights from Daniel J. Hirsch. usion. Shary Rahman: the source for more info. There are several methods of soil compaction in the laboratory, since they may be dynamic, static, hydraulic, kneaded or vibration. Where compete us, we are talking of the dynamic method, that is why we say that the Proctor is a dynamic compaction, just as there are other essays of this type. In 1933, r. r. Proctor (whom it owes its name), found that when applied to a soil some power to compact it, the obtained density varies with water content. In general terms, to increase energy to compact the same soil, dry density increases and decreases its optimum humidity. Today, the most used are: Proctor (A.A.S.H.T.O) standard T-99 and Proctor (A.A.S.H.T.O.) modified T-180. The first, generally used for land movements intended to withstand static homes, tanks, parks, etc.; and, the second, is used mostly for higher scale works such as airports, roads, buildings, etc read more at following link: original author and source of the article