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Guidance on Concrete workability & ideal gradation

Guidance on Concrete workability & ideal gradation

Guidance on Concrete workability & ideal gradation

(OP)
Hello Everyone,

I'm a recent Master's graduate at my first job (less than a year in so far) and I've been encountering and dealing a lot with a certain issue that I have a very limited knowledge of - aggregate gradation & the corresponding impact on the ability to finish / polish a slab. My mentor has recently created a spreadsheet that provides a nice, graphical output of the gradation analysis.

This sort of thing is very important for clients/architects that desire a top-notch exposed slab on grade. With the most recent mix submittal, the Adjusted Workability Factor and Coarsness factor are off the chart (literally, they don't appear on the Shilstone Chart) but the fine aggregate gradation and combined gradation look reasonably good, which is surprising for a mix that uses 50% course aggregate and 50% fine aggregate.

Does anyone have any resources on gradation and it's impact on the finishibility/appearance of exposed interior slabs, or even some first-hand experience on the matter?

Thanks!

It's worth noting the 1-2-3 line is pretty inconsequential, it's included simply because many of the best mixes follow the age-old mix proportion of 1 part cement, two parts fine aggregate, and three parts course aggregate.

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