Anti-cracking admixture for strong-constraint composite wall lining concrete

The invention discloses an anti-cracking admixture for strong-constraint composite wall lining concrete, wherein the anti-cracking admixture comprises, by mass, 2-4% of a hydration heat regulating material, 1-2% of shrinkage-reducing high-performance polycarboxylic acid powder, 0-0.1% of a defoaming agent, 2-5% of a water-absorbing resin, 4-7% of a moisture evaporation inhibitor and the balance ofa whole-course compensation expansion component. According to the present invention, the anti-cracking admixtureis mainly used for the characteristics of high constraint, high cracking sensitivity and like of the composite wall lining concrete, and can perform multi-aspect cooperative regulation and control on various contractions after self-pouring of the lining concrete so as to reduce the shrinkage driving force and suppress the crack generation; and the anti-cracking admixture of the invention is suitable for strong-constraint composite wall lining structures, can solve the problem of easy cracking of composite w