The invention belongs to the technical field of wall joint filling, and relates to a wall
cracking joint filling agent and a wall joint filling process, the wall
cracking joint filling agent comprises a
cement-based cementing material, fine aggregate, modified
toughening fiber, modified
nano zinc oxide, a dispersing agent, a defoaming agent, a water-retaining agent and a
mildew preventive; the modified toughened
fiber is obtained by sequentially carrying out alkali
etching,
dopamine coating and intercalated kaolin loading on
polyacrylonitrile fiber; the modified nano-
zinc oxide is obtained by modifying nano-
zinc oxide through a
silane coupling agent and
coating and modifying the nano-
zinc oxide through
chitosan. According to the wall crack repairing agent provided by the invention, the modified
toughening fibers and the modified
nano zinc oxide which are subjected to surface functionalization treatment are introduced, so that the
crack resistance and
toughness of a
cement-based crack repairing material can be remarkably improved, the
occurrence probability of secondary
cracking after repairing can be remarkably reduced, meanwhile, lasting and effective
mildew-proof and antibacterial capabilities can be provided, microbial
erosion can be inhibited, and the service life of the wall crack repairing agent is prolonged. And good construction
operability and basic mechanical properties of the material are maintained.