CA....

[jumpy120]

Is there some type of guidelines for understanding the nomenclature of CA6 or CA7 or CA13???

Is there a standardized chart or quick reference somewhere? I always have a hard time remembering which each is (IE: material, size). Any help would be appreciated?

 

[Maury]

CA stands for coarse aggregate, and the the number is the gradation. The should be a number of online sites that provide a list of the gradations with the sieve sizes. (try a Department of Transportaion site). The material can be limestone, gravel or any other granular material.

There are also standars for FA (fine aggregate).

 

[jumpy120]

Can anyone answer my question?

 

[Ron]

CA6 is a coarse aggregate gradation under the Illinois Department of Transportation's Standard Specifications for Roads and Bridges. Check Section 1000 on "Materials". In the 2002 manual, see the gradation chart on page 798.


(the number after the CA designation are %passing sieves)
CA 6 100 95±5 75±15 43±13 25±15 8±4
CA 7 100 95±5 45±15 5±5
CA 13 100 97±3 80±10 30±15 3±3

CA6 is slightly more coarse than No. 57 stone (As noted in ASTM C33)
CA7 is more coarse than CA6, mostly because it has fewer of the finer coarse aggregate sizes
CA13 is finer than either of the other two.

Before you get impatient because you have not received an answer to your question in the forum, you might want to Google a few terms...this can be found in less than 5 minutes of searching.

 

[jumpy120]

Ron, thanks for the answer. I actually could not find an answer after looking for quite a while and finally decided to log onto this site. And, I agree, you're advice pertaining to Google is true in most all cases. Except, I've come across a variety of different/vague "it's some type of gradation number" or conflicting generalizations throughout my search and even in questioning experienced mass grading contractors AND civil engineers. Just a question that always bugged me. Hopefully that clears up your speculation.

Always Patient,
Jake

 

[Ron]

Jake...my apologies. After sending my reply I noticed you had been waiting 7 or 8 days for an answer. You weren't impatient after all.

You might want to check ASTM standards on aggregate gradation such as ASTM C33 or ASTM D1241. These are more universally accepted as compared to IDOT specifications, although I believe you are in Illinois so that might be your primary reference there.

Good luck,
Ron

 

[dicksewerrat]

Each and every DOT publishes a 'Standards' book. Most can be accessed online. I just got some info from
VDOT and Penndot.

Richard A. Cornelius, P.E.

http://WWW.amlinereast.com