Irrelevant.
Obelisks are not lifted 40+ storeys vertically.
they are moved many miles over terrain. Simply all you need is ramps, pullies and counter weights, The collapsed pyramid at Meidum revealed a ramp system used there,
You are wrong obviously. It is a construction material that anyone can Google to learn about.
Do you read your sources?
There is nothing about concrete, only soft and hard limestone.
The soft limestone isn’t soft, it just has a high clay content, which is separated when soaked in water. The aggregate is still limestone.
Read again it describes making concrete blocks using the material from the soft limestone.
You may need to go back to school and learn English again. From the reference:
"In prehistoric times most of present-day Egypt was submerged under the sea. The decomposing remains of marine organisms, shells and skeletons, plants, seaweed and algae, fallen to the bottom of the sea, formed mud that condensed itself into a sedimentary rock we call limestone.
A natural process that lasted thousands of years consolidated and hardened them, forming banks of limestone. The pyramid blocks are made of this limestone, a sedimentary rock formed from skeletons and large fossil shells of marine organisms. These fossil remains are normally found in sedimentary horizontal layers. Yet, in the stones of the Great Pyramid,
Professor Davidovits found them in disarray, jumbled up together quite haphazardly as if they were artificially mixed with some kind of pestle.
Another phenomenon observed in the pyramid stones was the presence of air bubbles, organic fibers, bones and animal teeth, foreign materials never found in natural limestone – which would seem to be further proof that the stones were man-made."