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CA....
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Source：Internet Author：Unknow Pubdate：2010-03-07
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jumpy120 (Civil/Environme)
8 Feb 10 14:25
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 (Civil/Environme)
9 Feb 10 12:29
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 (Civil/Environme)
16 Feb 10 12:31
Can anyone answer my question? 字串8
Ron (Structural)
16 Feb 10 13:47
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
字串1
jumpy120 (Civil/Environme)
16 Feb 10 22:21
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 margin-right:0;">
Ron (Structural)
17 Feb 10 5:46
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 (Civil/Environme)
17 Feb 10 10:58
Each and every DOT publishes a 'Standards' book. Most can be accessed online. I just got some info from 字串4
VDOT and Penndot. Richard A. Cornelius, P.E.
WWW.amlinereast.com
（Click：）
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