In the production of autoclaved aerated concrete blocks, the excessively fast gas generation of aluminum powder paste frequently causes common quality defects. The typical problems include mold collapse, oversized pores and interconnected holes in finished aerated bricks. These issues severely damage the compactness, structural stability and overall quality of the brick products, failing to meet production standards and affecting normal delivery and application.
A series of targeted process and proportion adjustments can effectively solve these problems by delaying the gas generation rate of aluminum powder paste and balancing the slurry thickening and foaming progress. First, appropriately reduce the dosage of lime. Excessive lime increases the alkalinity and reaction temperature of the slurry, accelerating the chemical reaction of aluminum powder paste, so cutting lime dosage can slow down gas generation fundamentally. Second, lower the production temperature to weaken the activity of the foaming reaction and avoid rapid centralized gas release.
Besides, increase the water consumption to optimize slurry fluidity and moderate the reaction speed. Adding a proper amount of gypsum is also an effective measure to restrain fast foaming and stabilize the molding state. In terms of production technology, properly extend the stirring time of aluminum powder paste. This enables the aluminum powder to disperse evenly in the slurry, prevents local concentrated reactions, and avoids large pores and hole connection caused by uneven foaming. The coordinated application of all these methods can perfectly match the foaming speed with slurry thickening, eliminating mold collapse and pore defects.
after adjust ,the aac block is like this :
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