Autoclaved aerated concrete block equipment production of the embryonic body collapse model is how Huachang Machinery specializes in the production of autoclaved aerated concrete block equipment, quality assurance, after-sales service perfect!
In the production of autoclaved aerated concrete block equipment, failures are often caused by some artificial or non-human factors, such as the collapse of aerated concrete. Today, Huachang technicians analyze the settlement of the agglomerated concrete body in detail. Method. In the early stage of the aerated brick, the collapse mode occurs in the early stage of the slurry gas generation, and generally refers to the collapse mode within the high expansion stage within 15 minutes of pouring.
The collapse of the embryo body produced by autoclaved aerated concrete block equipment is generally caused by the following factors:
1. The water-to-material ratio is large, the viscosity of the slurry grows slowly, and the bubbles are easy to collect large bubbles and float up.
2. The aluminum powder particles are too fine, covering an area of ​​more than 6000 square meters / gram, and early gas is too fast.
3. The slurry temperature is too low and the lime digestion temperature is low.
4. The storage time of fly ash is too long, the particles are coarse, and the carbon content is large. When wet ash is used in winter, the ash contains ice particles.
In order to solve the collapse model of aerated concrete blocks, it is required to carry out the facilities around the viscosity of the slurry, overcome the gas generation of the aluminum powder and adopt the measures of stabilizing the foam. The ways are as follows:
1. Appropriate addition of limited lime mixing in the condition of conditional consent;
2. A certain amount of waste slurry is mixed into the pulverized coal slurry (the mixing time is as early as possible);
3. Check the dust ash point of fly ash to prevent the use of fly ash that has been stored for a long time and has a knot;
4. Adding excess water glass, delaying the aluminum powder to generate gas, and overcoming the defect that the aluminum powder is too early;
5. Adding a certain amount of a bubble oil agent such as soluble oil;
6. Check the grinding effect of fly ash to ensure the fineness of fly ash;
7. Properly reduce the water to material ratio, prompting a rapid increase in viscosity.
The late collapse mode of aerated concrete occurs when the slurry approaches thickening, and the collapse mode caused by local bubbling and subsidence occurs generally after 15 minutes. Late collapse is often caused by fluctuations in lime performance or excessive lime digestion.
When aerated concrete adopts lime with too fast digestion speed and high digestion temperature, the temperature of the slurry changes greatly in the height direction of the mold, the top heats up quickly, and the temperature is lowest; the bottom heat dissipation is second, the temperature is lower; the middle part is not easy to dissipate heat, the temperature highest. Thus, the pore pressure, pressure gradient, and ultimate shear stress are not uniform along the height of the mold. The ultimate shear stress is the largest in the middle, and the gas is easily suppressed. The longitudinal crack is extended to the place where the ultimate shear stress is small. The top limit shear stress is the smallest, and the gas is the most comfortable. However, when a part of the part continues to generate gas or gas pressure, the surface of the slurry is pulled off at the top to form bubbling and collapse. The main solutions are as follows:
1. Inhibition of the digestive speed of quicklime, appropriate addition of gypsum in the ingredients, and consideration of the appropriate amount of triethanolamine;
2. Digest some lime in advance and prolong the storage time of lime;
3. Adjust the mix ratio, reduce the amount of lime and increase the amount of cement;
4. Do not use too thick aluminum powder or reduce the amount of aluminum powder;
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