ASTM D698-12e2
采用標準作用力 (12 400 ft-lbf/ft3 (600 kN-m/m3)) 測定土壤實驗室壓實特性的標準試驗方法
Standard Test Methods for Laboratory Compaction Characteristics of Soil Using Standard Effort (12 400 ft-lbf/ft3 (600 kN-m/m3))
- 標準號
- ASTM D698-12e2
- 發布
- 2012年
- 發布單位
- 美國材料與試驗協會
- 替代標準
- ASTM D698-12(2021)
- 當前最新
- ASTM D698-12(2021)
- 引用標準
- ASTM C127 ASTM C136 ASTM D2168 ASTM D2216 ASTM D2487 ASTM D2488 ASTM D3740 ASTM D4253 ASTM D4718 ASTM D4753 ASTM D4914 ASTM D5030 ASTM D6026 ASTM D653 ASTM D6913 ASTM D854 ASTM E11 ASTM E177 ASTM E691 IEEE/ASTM SI 10
- 適用范圍
5.1 Soil placed as engineering fill (embankments, foundation pads, road bases) is compacted to a dense state to obtain satisfactory engineering properties such as, shear strength, compressibility, or permeability. In addition, foundation soils are often compacted to improve their engineering properties. Laboratory compaction tests provide the basis for determining the percent compaction and molding water content needed to achieve the required engineering properties, and for controlling construction to assure that the required compaction and water contents are achieved.
5.2 During design of an engineered fill, shear, consolidation, permeability, or other tests require preparation of test specimens by compacting at some molding water content to some unit weight. It is common practice to first determine the optimum water content (wopt) and maximum dry unit weight (γd,max) by means of a compaction test. Test specimens are compacted at a selected molding water content (w), either wet or dry of optimum (wopt) or at optimum (wopt), and at a selected dry unit weight related to a percentage of maximum dry unit weight (γd,max). The selection of molding water content (w), either wet or dry of optimum (wopt) or at optimum (wopt) and the dry unit weight (γd,max) may be based on past experience, or a range of values may be investigated to determine the necessary percent of compaction.
5.3 Experience indicates that the methods outlined in 5.2 or the construction control aspects discussed in 5.1 are extremely difficult to implement or yield erroneous results when dealing with certain soils. 5.3.1 – 5.3.3 describe typical problem soils, the problems encountered when dealing with such soils and possible solutions for these problems.
5.3.1 Oversize Fraction—Soils containing more than 308201;% oversize fraction (material retained on the 3/4-in. (19-mm) sieve) are a problem. For such soils, there is no ASTM test method to control their compaction and very few laboratories are equipped to determine the laboratory maximum unit weight (density) of such soils (USDI Bureau of Reclamation, Denver, CO and U.S. Army Corps of Engineers, Vicksburg,......
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