Abstract: The use of lightweight aggregate with built-in repairing agent to make cementitious materials with crack self-repairing ability is a new strategy for cementitious materials, which can prolong the service life of cementitious materials. The composition, design, self-repairing mechanism and performance evaluation of lightweight aggregate self-repairing cementitious materials are comprehensively reviewed, with emphasis on the repair systems of natural/man-made types of lightweight aggregates with built-in inorganic repair agents or microorganisms, and the repairing effect of lightweight aggregate self-repairing system is systematically sorted out from the mechanical properties, crack closure and durability. The reco-very rate of compressive strength basically reaches more than 80%, crack width closure reaches 90%, and durability properties such as capillary water absorption rate and chlorine ion permeability are also reduced. Finally, the future development directions and the difficulties to be overcome in the field of lightweight aggregate self-repairing cementitious material are discussed, aiming to provide guidance and suggestions for the application of this research.
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