8 pearock stone 9course aggregate0 for structural conc

huangyhg

#8 pearock stone (course aggregate) for structural conc.
does anyone see any objection with using a rounded #8 stone for a shearwall pour vs. using an angular (crushed) stone?
tia
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you are changing the mix design.  then you just have to do concrete test to make sure it meets your spec.  doesnt matter what aggregate you are using as long as you meet the 28 days strength that you want.
sounds like you'll have more surface area of aggregate.  i'd expect more paste and shrinkage.  aci recommends larger aggregate for less shrinkage.
ahunt is correct. compressive strength will be no problem, but shrinkage and cracking will be. therefore the largest practical msa mix should be used.
factors affecting the selection of msa are outlined in aci 318 section 3.3.2..other factors include the concrete coverage for reinforcing steel (used no more than 3/4 cover) and method of placement. the minimum diamter of the pump wll depend inter-alia, on the msa and grading of the mix.
smaller aggregate mixes require more water to achieve the same level of workability as mixes with larger msa.
check out the link posted by dik in the aci forum.