Abstract：From the two perspectives of cement matrix and reinforcing fiber, the principles of concrete toughening and crack prevention are reviewed, and then the influencing factors and the effects of toughening and crack prevention technologies are analyzed, together with the introduction of some typical applications. From the molecular, microscopic and mesoscopic levels, the mechanisms of the toughening of cement matrix by applying nanomaterials, organic polymer materials and polymers are explained. From the aspects of fiber-matrix interfacial bonding strength, crack formation and non-steady state crack propagation suppression, the effects of fiber types and characteristics on the toughening and crack prevention of concrete before and after its setting and hardening are discussed. The combination of matrix toughening and fiber toughening can increase the tensile strength, tensile strain and fracture energy of concrete, effectively reduce the width of cracks and restrain crack propagation.
