Bringing a CBR of 87 to 90
Bringing a CBR of 87 to 90
(OP)
I work for a small road construction company. I am not an engineer but my boss has tasked me with a project. The quarry we use has gravel with a CBR of 87 and we need a CBR of 90. I need to find a solution that will do this before the gravel reaches the construction site. I have come up with using a pug mill and adding nickel slag to the gravel. Does this sound right? I also need the ratio of gravel to slag mixture. If someone can help, it would be greatly appreciated.





RE: Bringing a CBR of 87 to 90
f-d
¡papá gordo ain't no madre flaca!
RE: Bringing a CBR of 87 to 90
RE: Bringing a CBR of 87 to 90
For the purpose of the original post, if you are dealing with a stupid spec, I'd do several CBR tests and then use an average. I'm not even sure I'd bother with the soak.
One item that comes to my mind is how is the sample being prepared? Is there a Emax and Emin so you can prepare the sample to some relative density? Any "Proctor" approach to sample preparation would be seemingly meaningless.
Good luck,
f-d
¡papá gordo ain't no madre flaca!
RE: Bringing a CBR of 87 to 90
Can you move about the site and use material from areas where the rock is harder?
As to blending, do you have areas where the blasting was done and large harder stuff (in large blocks) can be separated off and then crushed?
As to ratio, it would appear trial mixes are needed.
However, first run more tests on what you have as has been advised above.
RE: Bringing a CBR of 87 to 90