The date of construction of the building is known because of the comprehensive radiocarbon dating that has been carried out on it.
The results can be found in the academic paper
RADIOCARBON DATES OF OLD AND MIDDLE KINGDOM MONUMENTS IN EGYPT
Georges Bonani1 • Herbert Haas2 • Zahi Hawass3 • Mark Lehner4 • Shawki Nakhla5 •
John Nolan6 • Robert Wenke7 • Willy Wölfli1
This shows the samples for the Great Pyramid range between 2870-2640 BCE, which is the date period of construction of the building. So there is nothing to research on this subject.