self compacting #57 stone...again?!
self compacting #57 stone...again?!
(OP)
this is more of a reminder for those threads that are buried deep in pages that never get seen anymore. #57 stone (or any other aggregate) is NOT self compacting...it is far from it. this topic always manages to come back around and i'm always lost for words at how many people blurt out "it's self compacting and has been for the 15 years i've been doing this". this is one topic that continuously starts a fight because everyone thinks they're right. i have plenty of data to prove that it is not and will put up my pay check in a bet any day of the week. if you think that your project may utilize crushed aggregate, please do a search of threads on eng-tips and read up...there has been many discussions on the topic. better yet, just think about this:
1. is silts/clays self compacting? no
2. is sand self compacting? no
3. is rock fill self compacting? no
4. so why would anything in between be self compacting?
when you do a search, you can actually find threads where i've passed along quick and dirty ways to prove it to yourself. your techs, engineers and company will appreciate the fact that you're not exposing them to ridiculous mistakes. 75% of all forensic investigations i've done related to foundation problems involved #57 stone...
if anyone has formal references, papers, articles, etc that discusses this topic, i surely would appreciate if you could pass along the link. i'll continue looking. maybe i'll write an article for publication backed up with field examples and lab data. this topic comes up on just about every single cmt project.
best regards
1. is silts/clays self compacting? no
2. is sand self compacting? no
3. is rock fill self compacting? no
4. so why would anything in between be self compacting?
when you do a search, you can actually find threads where i've passed along quick and dirty ways to prove it to yourself. your techs, engineers and company will appreciate the fact that you're not exposing them to ridiculous mistakes. 75% of all forensic investigations i've done related to foundation problems involved #57 stone...
if anyone has formal references, papers, articles, etc that discusses this topic, i surely would appreciate if you could pass along the link. i'll continue looking. maybe i'll write an article for publication backed up with field examples and lab data. this topic comes up on just about every single cmt project.
best regards





RE: self compacting #57 stone...again?!
RE: self compacting #57 stone...again?!
RE: self compacting #57 stone...again?!
sand is not self compacting though so don't misinterpret the term...it's basically liquefaction. liquefaction doesn't "just occur" since there has to be some energy applied. self consolidating grout...you pour it and it's done. it doesn't work that way with soil, sand, silt, clay, aggregate, rock etc.
RE: self compacting #57 stone...again?!
RE: self compacting #57 stone...again?!
RE: self compacting #57 stone...again?!
RE: self compacting #57 stone...again?!
http:
RE: self compacting #57 stone...again?!
Table 6/2 shows the grading for the material is 5mm to fine material?
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RE: self compacting #57 stone...again?!
RE: self compacting #57 stone...again?!
RE: self compacting #57 stone...again?!
Read the case history by MAJ Matich et. al. on the construction of the Rainy Lake Causeway - at this site they had fairly shallow water but the foundation soils were soft varved clays/silts. The stability of the embankment if placed directly on the material would be suspect so a program of blasting the soils to remould in order to dump rock fill and displace - without compaction - was used. This same technique, known, too, as the rolling surcharge (See Michingan DOT article in 1946) does not compact a road embankment in a swampy portion of the site until the "base" is able to support the compaction efforts.