Micromorphology of aeolian sand concrete with different damage degrees after the coupling action of stress, freeze-thaw and salt intrusion.

a. The damage degree after stress, freeze-thaw and salt intrusion is 0.0, and the content of aeolian sand is 40%. The results of electron microscope test of aeolian sand concrete. b. The damage degree after stress, freeze-thaw and salt intrusion is 0.1, and the content of aeolian sand is 40%. The results of electron microscope test of aeolian sand concrete. c. The damage degree after stress, freeze-thaw and salt intrusion is 0.2, and the content of aeolian sand is 40%. The results of electron microscope test of aeolian sand concrete. d. The damage degree after stress, freeze-thaw and salt intrusion is 0.4, and the content of aeolian sand is 40%. The results of electron microscope test of aeolian sand concrete.