Estimating volume of crushed stone using in-place volume from drawings

[geoman1]

Seeking information on how I can estimate the volume of crushed stone to purchase if the only data available is the final volume (from bid drawings) of the material in-place after compaction,(i.e., what would the typical "fluff factors" be for #2 crushed stone, #3 washed crushed stone, subbase Type 4, etc.) Stone/Gravel suppliers have some estimates but I seek other data if available. Thank you.

 

[Focht3]

The material suppliers are probably your best resource - they (should) know their own materials.



Please see FAQ731-376 for great suggestions on how to make the best use of Eng-Tips Fora.

 

[DRC1]

Conversion Factors from stone suppliers are usually quoted lose for truck measure comparison. You should confirm that with the stone supplier. If it is loose, the density will increase somwhat in place, although the increase will not be as much as for earth percentage wise. Also be sure to get a quote from the area of the project. Diferent types of stone (trap rock, granite, etc. will have significant differences in unit weight.

 

[DDS1]

Geoman,

My experience with clean crushed stone (from the midwest) is 1.15-1.2:1. Of course, I too first came across these numbers from the gravel pits owners. A good point mentioned by DRC is that the loose volume to compacted volume for clean crushed gravel is not as significant as that of class 5 or pit run sand which I usually runs up at about 1.35 or 1.4 :1. As also mentioned above, the pit guys know or should know their particular rock but if there values different significantly from the above numbers I would be somewhat suspect at least as far as my experience goes.

DDS1

 

[VAD]

Try a factor of 1.06 times the quantities on the drawings The factor should be greater than about 1.10

 

[jimbo]

GEOMAN1
Do you still need info? I have been retired for some time, but have [somewhere] a list of different aggregate material and gradation, in tons/inch/sq.yd..
If you think that will help, I will look.


Buy a dictionary, keep it nearby and USE it. Webster's New World Dictionary of American English is recommended, and Webster's Collegiate Dictionary.