2002年11月17日 · Based on data given in the manual, I developed an equation relating the Modified Proctor maximum density to the Standard Proctor value. The D1557 density is about 97.5 percent of the D698 value + 10.75 pounds. In other words, if a soil has a D698 dry density of 100 pounds, the D1557 value would be about 0.975(100) + 10.75 = 108 pcf.

2010年6月15日 · ASTM is generally specified for all else. It has nothing to do with material size or source...either would apply for those variables. As for your example, AASHTO T99 has a similar ASTM designation. It is ASTM D698 (commonly called the "standard Proctor"). AASHTO T180 more closely corresponds to ASTM D1557 (commonly called the "modified Proctor").

2004年1月14日 · As for the selection of D698 or D1556 - this many times is a matter of choice. Typically for granular fills I would use, 97% MDD D1556 = 100% MDD D698. I will typically specify D698 for areal fills but D1556 for structural fills (say to support a footing). Others, such as Focht3 might say differently due to norms in his area of work.

2008年2月4日 · When and why would one use ASTM D4253 or D4254 for determining density? The specification I’m looking at lists these along with the ASTM D698 and I’m unfamiliar with 4253&4254. The required percent compaction is significantly reduced when testing based on 4253&4254 (i.e. 95 down to 70% for Type A material and 90 to 50% on Type B). Thank you.

2021年5月12日 · You see 100% of D698 or 1557 typically for sensitive pavement structures, like an airport runway, or in areas where a structure will rely on passive earth pressures to resist lateral loads. Upvote 0 Downvote

2005年3月31日 · I gotten myself really confused on how to correct for oversized fraction using ASTM D4718 and D698. Methods D698 call for test to be run on material passing 3/4 or 3/8 or #4 sieve and to correct if 5% of coarse fraction is not used in …

2013年7月18日 · ASTM D1557-58t ? Thread starter ERC123; Start date Jul 18, 2013; ... ASTM D698 is 3 layers. Replies ...

2003年1月7日 · Yes, D698 can be used; however, for base material I would use a higher compaction standard such as D1557, the modified Proctor. Also, determining the actual moisture content of milled asphalt is a bit tricky.

2006年8月10日 · I have aquestion that we correct max dry density vs. moisture content curve for +4 material in ASTM D698-what is in AASHTO T-99? Do we also correct the curve in AASHTO T99 or not. I have seen a curve without correction even though the material had coarser fraction.

2005年3月31日 · Methods D698 call for test to be run on material passing 3/4 or 3/8 or #4 sieve and to correct if 5% of coarse fraction is not used in test. Since you are only using material passing the specific sieve, doesn't this require you to correct for oversized fraction most of …