M15 should not be used in structural concrete. In addition, it is better to mix design instead of using the nominal mixes mentioned by others!
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Also the program have to be ideal to beginner. can you suggest a software to me espessicialy for aviation sector?
Give the reason of desert sand never used in construction works
Tensile strength is a feature of APP membranes. The term “tensile strength” describes the shear load that a structure can withstand until fracturing beneath strain.
Australia; there are still major land and ground work going on where other countries are building skyscrapers nowadays.