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Road Aggregate Gradation Curve

 
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saikiran gone
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PostPosted: Thu Sep 07, 2017 4:32 am    Post subject: Road Aggregate Gradation Curve Reply with quote

Dear All,


Please clarify me on the below table for gradation curve.

1. What exactly difference between the gradation A -F proportions,

2. In gradation A, the value for 25mm gravel is given as --- what exactly mean by this.

3. In gradation C, the value for 25mm weight passage % is 100, this means in this gradation the maximum aggregate size is 25mm? please clarify.

Thanks in advance,

Regards,
Saikiran Gone.



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es_jayakumar
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PostPosted: Fri Sep 08, 2017 1:59 pm    Post subject: Reply with quote

Dear Er.Saikiran,
1. You shall understand that "Gradation of Aggregates" is the method of ensuring the representation of aggregates of stipulated sizes in the mass Aggregates of given category. The categorisation is specific to the purpose for which the aggregate is used. In your case, six zones of grading A to F are represented, moving from coarser to finer.
(By the way, from which Code / Manual is it taken ? Is it intended for Road work ?)
Before starting the site work, you have to carry out testing at site to see if the aggregate brought conforms to the specified zone of grading. For this, you need to carry out the sieve analysis using the category of sieves stipulated in the Table. By taking 2000g of the aggregate or so, you do the sieve analysis. Then, you compute the "percentage passing", which governs the Gradation. Relevant IS Codes / CPWD Specifications lay down the stipulations on the gradation zone of aggregates to be used for various category of works involving use of aggregates (RCC, plastering etc.). A sample spread sheet that can be used for computing this, in line with CPWD Specifications, is attached.
2. Blank cells indicate that, that specific sieve is irrelevant for for the given zone of gradation. In your case, for gradation A, you need not include 25mm sieve in the sieve set. Below 50mm sieve, you can directly keep 9.5mm sieve for sieve analysis.
3. Yes.... 100% of the aggregates should pass through 25mm sieve indicates that the maximum size of the aggregate should be 25mm (or less)
You can ask for any further clarification....

E S Jayakumar



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saikiran gone
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PostPosted: Tue Sep 12, 2017 6:42 am    Post subject: Reply with quote

es_jayakumar wrote:
Dear Er.Saikiran,
1. You shall understand that "Gradation of Aggregates" is the method of ensuring the representation of aggregates of stipulated sizes in the mass Aggregates of given category. The categorisation is specific to the purpose for which the aggregate is used. In your case, six zones of grading A to F are represented, moving from coarser to finer.
(By the way, from which Code / Manual is it taken ? Is it intended for Road work ?)
Before starting the site work, you have to carry out testing at site to see if the aggregate brought conforms to the specified zone of grading. For this, you need to carry out the sieve analysis using the category of sieves stipulated in the Table. By taking 2000g of the aggregate or so, you do the sieve analysis. Then, you compute the "percentage passing", which governs the Gradation. Relevant IS Codes / CPWD Specifications lay down the stipulations on the gradation zone of aggregates to be used for various category of works involving use of aggregates (RCC, plastering etc.). A sample spread sheet that can be used for computing this, in line with CPWD Specifications, is attached.
2. Blank cells indicate that, that specific sieve is irrelevant for for the given zone of gradation. In your case, for gradation A, you need not include 25mm sieve in the sieve set. Below 50mm sieve, you can directly keep 9.5mm sieve for sieve analysis.
3. Yes.... 100% of the aggregates should pass through 25mm sieve indicates that the maximum size of the aggregate should be 25mm (or less)
You can ask for any further clarification....

E S Jayakumar


Thanks Jayakumar Sir, for your information.


Can please share gradation to be followed for the road construction material (G5).


Regards,
Saikiran Gone.
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es_jayakumar
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PostPosted: Tue Sep 12, 2017 4:12 pm    Post subject: Reply with quote

You better refer IRC Codes / CPWD Secifications ( http://cpwd.gov.in/Publication/Specs2009V2.pdf ) for clarification in this regard.

E S Jayakumar
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