Ultrathin special masonry mortar for autoclaved aerated concrete block and lightweight block

The invention discloses ultrathin special masonry mortar for an autoclaved aerated concrete block and a lightweight block. The mortar comprises the following components in percent by mass: 18.43 to 21.43 percent of cement, 5 to 7 percent of hydrated lime in powder, 74 to 76 percent of ground manufactured sand, 0.12 to 0.15 percent of a water retaining agent, and 0.55 to 0.65 percent of redispersible powder. The thicknesses of plastered layers on the surfaces of the autoclaved aerated concrete block and the lightweight block (brick) are not greater than 3mm. Watering is not required to be poured before the autoclaved aerated concrete block and the lightweight block (brick) are built to a wall, the autoclaved aerated concrete block and the lightweight block (brick) can be directly built, common quality problems, such as wall cracking and leakage, can be effectively solved, the construction cost can be saved, and construction processes can further be shortened. 用于蒸压加气混凝土砌块和轻型砌块的超薄专用砌筑砂浆，所述砂浆配方及其质量比如下，水泥18.43-21.