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No my quarry dust is not stored in a silo.

Yes I agree,Aggregate quality makes a huge difference...I got the same results with dirty material at 7days compared to clean material after 4 days.

zambo mentioned that the Quarry dust is perfectly good replacement which I agree.In a typical mix design,what do you recommend the percentage of quarry dust should be in your fine aggregate.

Can anyone tell me what their typical C40 Mix design would be..So i could weigh all possible causes of low strengths.my top three causes which I am investigating are: 1.Dirty Material 2.Mix Design 3.Handling/Curing Practices Thanks

Thanks all for your comments..appreciate it.I will let you know the final outcomes.etc

Hey I should be getting way more than 40MPa..but I will wait for my 28day test results.At 600 Cement, after 4 days I am getting 30Mpa so that should be a good sign!?

sorry my mistake sand 500 cement 600 Quarry dust(fines)249 water 190 20mm 680 10mm 425 At 400KG cement/m3 I am not getting the 40MPa results.The 3 day results I got which was 30MPa was using 600kg cement /m3. This should not be ...ok heres a question...would 30MPa after 3 days be a good...

cement 600km/m3 20mm 680 10mm 425 quarry dust 249 water 190L

my results with 400Kg/m3 are really low...thats why i had to increase the amount of cement.

Hey thanks for the response but this is using 600kg/m3 of cement.According to other designs ive seen, one should obtain that strength from about 400kg/m3

I am getting low compressive strengths for my C40 concrete.i use cubes to test the strengths.my 3day M Pa is 30 but this is using 600kg/m3 of cement. to me this is a bad result.I should be acheiving that strength using about 400kg/m3 of cement.My w/c ratio is very low;.32-.35.I cant figure out...