1. Concrete has been used by humans for more than 8000 years
Concrete has been found used by ancient cultures and was used to build structures that still stand to this day. Ancient nomadic peoples like the Nabateans from the Arabian penninsula were among the first humans found to have used the material. Greeks also used the material as far back as 1400 BC when, and romans built what is still today the largest unreinforced concrete dome on Earth.
2. Making cement reduces waste from other sources
Cement (the crucial ingredient in concrete) is a mixture of limestone, clay and usually gypsum. The process of making cement requires very high temperatures over long periods of time. The ingredients must be sufficiently heated and mixed appropriately, meaning that it takes a lot of energy to run a concrete kiln. The upside is that the kilns can be powered by almost any hard to dispose of fuel, like used rubber products. This helps dispose of waste, create concrete and control emissions because of the environmental considerations the plants already must take.
3. Concrete hardens over the course of (usually) 3 years
There’s a reason you’re not supposed to walk on freshly dried concrete! The first three days are critical to the long-term durability of poured concrete, and putting undue stress on a slab too early will destroy the chemical bonds that hold it together. In fact, it takes up to several years for concrete to completely harden into its final form. But the first three days are absolutely critical to the longevity of the concrete because a significant portion of the long-term hardening process takes place during this time.