压实度试验检测（Compactness test）.doc

压实度试验检测（Compactness test） For Subgrade and pavement of semi-rigid and flexible base granular, compaction degree refers to the site of the maximum dry density ratio to dry density and the indoor standard compaction test; on the asphalt pavement, asphalt stabilized base, compaction degree refers to the ratio of the scene to the density and the density of the indoor standard. Therefore, the determination of subgrade compactness mainly includes indoor standard density (maximum dry density) and site density test. (selected for subgrade and pavement test and inspection technology, Ministry of communications, basic construction quality supervision station, organization and preparation) The compaction degree of subgrade is the quality control index of filling project. To determine the optimum water content of the dry density of compacted soil samples before the first sent to the laboratory, the samples of dry density. The maximum dry density of samples taken by the test, with the actual dry density divided by the maximum dry density is the actual soil compaction. By comparing the compaction degree with the standard, we can know whether the degree of soil compaction has reached the quality standard. Subgrade compactness = dry density / maximum dry density (100%) Edit the traditional method of compaction test in this section Usually the cutting ring and sand filling method and density method. The cutting ring, is a kind of destructive detection method, suitable for fine-grained soil containing aggregate. The utility model has the advantages that the equipment is simple and the operation is convenient; the disadvantage is that the soil is limited; when the ring knife is struck in the earth, the stress produced causes the soil to loosen and the stress caused by the wall thickness is larger; therefore, the dry density is reduced. Sand filling method is a destructive testing method, suitable for all kinds of soil. The utility model has the advantages that the measuring value is a