Fig. 10

a SEM micrographs of limestone from the backing stone blocks of Cheops pyramid. Observations of minute and deep cracks in the microstructure and salt crystallization into. b EDX spectrum and micro analysis of the previous image of the limestone grains from the backing stone blocks of Cheops pyramid. A strong Calcium signal is observed. c SEM micrographs of limestone from the backing stone blocks of Cheops pyramid. The micrographs show the reaction interfaces, service environment and degradation mechanism of the backing limestone blocks. d SEM micrographs of limestone from the backing stone blocks of Cheops pyramid