Series 600 Grading requirements table

[ac4u2nv]

Dear all
Im not clear on how this table works. i understand its based off PSD analysis however -
e.g. class 1 B states that 100% has to pass the 125mm seieve and less than 15% ca be within the 0.063mm sieve so where is the other 85%?

does it simply mean all the other boxes can contain mass from the sample tested - however for the sample to be compliant in addition it hsa to ALSO contain the mass mentioned with the specified range boxes.
Im looking at a psd sample now - and its fits none of the grades at all.

like wise 6m and 6n and p = nothing will conform to that - 100% pass the 75 mm and only 10% in the 63 microns seive - where is there rest of the materail going to.
also where is 6Q?!!! its mentioned in the doc but not in the table.
Please help

 

[EireChch]

Class 1B is a uniformly graded material, and needs to be smaller than 125mm as you said and contain no more than 15% fines. The grading make up (i.e. amount on each sieve) doesnt matter as long as your uniformity coefficient (D₆₀ / D₁₀)is less than than 10. Your uniformity coefficient is 1.6 which is therefore a (very) uniformly graded material, essentially you have a material that is 78% coarse gravels (63-20mm size) with the remaining 22% as medium gravels (20-6.3mm size).

Its a material suitable for general filling as Table 6/1 indicates but no good for structural filling.

 

[ac4u2nv]

thanks Eire
This value of being less than 10 where did that come from? is that a requiremnts for all fills?
how do you assess if the unformity is within range or now.

so from my understanding my image can be classed as a 1A or 1B only.
is that correct?

also, for eg 1A 125mm it says 95-100% - does that mean it must contain anywhere bewtween 5% material left on teh sieve - or upto 100% can pass through i.e leaving nothing?
As alot the grades have ranges upto 100% indicating everything can fall through and nothing has to remain.

pleasea advise

 

[EireChch]

Your material is 1B, as your material has a uniformity coefficient of 1.6 which is much less than 10. Google uniformity coefficient and you will see how its calculated, then look at your graph.

Yes between 95-100% has to pass, if 90% passes then you are outside the grading.

Yes if the grading is 100% then it means all material must pass through that sieve. For example, the fill to structures 6M and 6N, has 100% passing the 75mm. As this is fill to structures you would want to limit the maximum particle size to 75mm as its better for compaction.

 

[ac4u2nv]

Eire
I find all this quite confusing - the highways specs dont explain any of this so well - Are there any supplmentary resources you can advise i read to learn to understand all this better?

e.g. how thick should starter layer be?
how thick should the fill to strcutuures layer be?
how thick should the capping layer be?

etc..