普罗克特压实试验, CBR 压实

土壤压实试验

普罗克特压实试验
The 普罗克特压实试验, named in honor of Ralph Roscoe Proctor, is a laboratory method to determine maximum dry density of soil by determining the optimal moisture content at which a given soil will become most dense. The st和ard Proctor compaction test was first developed in 1933 和 was later updated to create the modified Proctor compaction test. The test is commonly used for engineering applications globally to determine how on-site measurements compare with the Proctor test results in the determination of soil density.

The test consists of compacting soil of known moisture content into a cylindrical mold using controlled magnitude compaction. The soil is compacted into the mold in layers by receiving blows from a weighted hammer at a specific height. After repeating the process for different moisture contents, dry densities can be determined. A compaction curve can then be developed to show the exact relationship between the dry density 和 moisture content. Maximum dry density 和 the corresponding moisture content are then obtained, or the optimal moisture content.

This methodology 和 corresponding equipment is detailed in ASTM D698, “St和ard Test Methods for 实验室 压实 Characteristics of Soil Using St和ard Effort”. Since the properties of soil will have immediate 和 long-lasting effects for engineering 和 structural integrity, accurate soil compaction tests remain critical to the geotechnical engineering 和 construction industries.

CBR 压实 Test (California Bearing Ratio)
Originally developed in the late 1920s by the California Division of Highways (now referred to as Caltrans 和 officially adopted in 1935), the CBR test was designed to ensure that highway pavements could economically carry the anticipated loads. The laboratory test is performed to evaluate soil subgrade strength 和 base course materials. Its many years of use 和 improvements have affirmed high reliability 和 accuracy for pavement engineering design.

正如 ASTM D1883 规范, “St和ard Test Method for CBR (California Bearing Ratio) of 实验室 Compacted Soil”, the test is relatively simple 和 has established reliability for field correlations of flexible pavement thickness requirements. The values obtained from CBR compaction tests are used by the Federal Highway Administration, state Departments of 运输ation 和 the Federal Aviation Administration.

洪堡 offers a complete line of soil compactors 和 molds for Proctor compaction testing, CBR 和 other types of soil tests. Our soil compactors 和 molds comply with ASTM testing st和ards such as ASTM D558, D559, D560, D698 和 D1557.

压实工具 包括 土壤压实锤, automatic mechanical compactors, 天天p锤子, 手动压实锤 及配件.

各种各样的 普洛克特模具 (st和ard 和 modified) are available in addition to CBR模具和LBR模具，与…一起 膨胀板, 切削刃 和权重.

Vibratory compaction equipment，例如 Vibratory 压实 Frame 和 Hammer Set，和 Harvard Miniature 压实 Apparatus are also useful for a variety of moisture density tests.

If you have questions or need help selecting equipment, please call us at 1.800.544.7220或使用我们的 问洪堡 form.