Modern mix designs allow for early high strength, sometimes reaching design strength within 24 hours. Typically concrete is tested at 28 days.That must be some fast-curing concrete!
Typically, its allowed to cure a bit longer than that:
Cranes play an essential role in building construction; their reach and ability to hoist large loads allows a variety of building materials to be placed wherever they are needed to build a structure. In today's Explainer, we explore the installation and the anatomy of a typical tower crane.urbantoronto.ca