So i calculate a mix design using the CSA fuller method. We assume agg is Saturated surface dry and I use Specific Gravity of the materials to calculate a volume so it all adds up to 1m3. Rule of thumb is 100 kg cement per 10Mpa of strength needed. I increase it a bit if there is air entrainment. By your calculations here, you are say over 400kg of cement powder for a 20 Mpa mix? I have been designing mixes for a few years now and I have never used that much powder and strength is still achieved. A mix with 400 kg is a hot mix as well, usually that would be for a 40 Mpa and we would add fly ash to replace some of the powder to cool the hydration process. Am i missing something here?
@rushikeshgodse
Жыл бұрын
Hello sir please make videos on stone and sand crashers in detail It will be much helpful 🙂
@orlandorosjr
7 ай бұрын
Thank you sir! What if Volume of concrete is let's say 576m³ and using Class AA (1:1.5:3), and I got the dry volume of 887.04 I tried to solve for the volume of Sand =1.5/5.5 × 887.04 = 241.92m³ How about the Volume of Cement and Aggregate, do I multiply the ratio to into 887.04? Cause my professor, he used 1.54 in finding sand volume then 1.57 for Aggregate and cement, I was confused. I hope to hear from you soon
@venkatragavan7640
5 ай бұрын
He just caclulated it for 1m3 of cement. Look at 1:55 it is saying 1.54 or 1.57 times of Wet volume. You have to multiply this 1.54 with your volume
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