The code to long lasting Roman concrete

Chemists have been trying to understand the process and recreate the long lasting concrete the Romans used, the chemists suspected that the key to this was a technique the Romans used called "e;Hot Mixing" Hot Mixing is is a method were quicklime is mixed with the aggregate and then water, this process generate heat and were the term hot-mixed comes from. Modern concete uses lime rather than quicklime. The reaction of quicklime with water processes a lot of heat and if not mixed correctly can possibly explode.

Hot mixing was assumed would produce a mix that wasn't completely smooth, but would contain little calcium rich rocks and this was considered to be the key to the Roman concrete that can withstand the harsh weathering of time.

Researchers have been trying for years to create the Roman recipe for concrete with little success. But with an educated guess hot mixing was found to be the key.

Although we know the key to long lasting concrete its not really feasible to use it in modern day construction. Roman structures took a very long time to build, hence the saying Rome wasn't built in a day. During the long build time the concrete was able to cure and develop its strength, structures built nowadays with the Roman recipe would probably not have the compressive strength for modern day use initially.