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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Give the reason of desert sand never used in construction works
Australia; there are still major land and ground work going on where other countries are building skyscrapers nowadays.
It looks like the walls are clad in stucco or some other cementitious product, which is cracking. It does not necessarily mean that the structure is failing. There does not appear to be any functional control joints in this rather large ...