I am building a detached garage with an office over. The inner leaf is dense concrete block with outer skin in hand made soft reds to match the main house. My structural engineer has specified padstones beneath steel beam to be block size 450x215x100 and concrete mix GEN 3. Can I cast these in situ and what mix is GEN 3?
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Casting a concrete padstone in situ
- Thread starter Neubauer
- Start date
GEN3 is an ST2 or C20 mix and can be cast insitu. 
Sorry, can you help further.....what are the ratios for mixing by hand to achieve ST2 or C20.....thanks
Bah!, knew you were going to ask...
1:3:6 - Cement:Sand:20mm aggregate. 50-75mm slump
1:3:6 - Cement:Sand:20mm aggregate. 50-75mm slump
That's really helpful.....final piece of the jigsaw......can you please explain 50-75mm slump, I assume it relates to water content? thanks
Yep its about the workability of the mix, not too sloppy-not to dry
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