Concrete aggregate testing

[Muckshifter]

Hi all,

Looking for some advice for concrete aggregate testing.

If I have a rock that will potentially be quarried and crushed for use as aggregate in concrete how should this be tested in accordance with BS882?

I'm confused as the tests in BS882 mainly refer to tests on the material after it has been graded eg flakiness index, sulphate content etc However if I just want to proved that a certain rock type is OK how is this done? I assume I wil have to crush it but how do you decide to what grading as this will not be known until detailed desgin...??

Thanks in advance

 

[geotechnicalenginee]

Yes, you will have to crush that. But I can’t seem to answer your question because I’m quite confused

 

[Ron]

Realizing that US standards are different than the British Standard you referenced, here is the process typically used here:

Have a petrographic evaluation done of the rock. Several samples will be required to show ranges of expectation.
Determine the consistency of the geology of the area so that you can feel confident of the applicability of your testing.
Perform compressive strength of intact rock cores
Crush the rock and grade to one of several standard concrete coarse aggregate gradations. In the US, those would commonly be designated #57 stone, #89 stone or similar. I'm sure the BS have similar.
Run the series of required tests for durability, reactivity, strength, etc.