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How to calculate target cement content of nominal mix prescribed in BS 8500-1-2016 ?

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Civilfreak

Structural
Apr 26, 2016
3
Hi,
In BS 8500-1-2016, Annex C, we can find target cement content for each prescribed ratio mix. For example if its 1:1:2 ratio, target cement content is 480 kg/m3 as per BS 8500-1. I have attached Annex C for reference. Can someone explain how they have derived 480 kg/m3 for mix ratio 1:1:2 ? I would like to know how they have calculated 480 kg/m3 for 1:1:2 mix ratio.
 
 http://files.engineering.com/getfile.aspx?folder=f5bf717f-b19a-4429-9014-2b300758539e&file=Screen_Shot_2018-02-20_at_18.11.10.png
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