Yan Xin experts explore the causes of cracking of autoclaved aerated concrete

As research on aerated concrete deepens, it has become clear that cracking in this material is caused by a variety of factors. These include issues during the production process, the quality of raw materials used, construction practices, and environmental influences such as expansion and shrinkage of the blocks, carbonation, temperature fluctuations, and freeze-thaw cycles. Understanding these causes is essential for improving the durability and performance of aerated concrete. Some researchers have identified specific mechanisms behind the cracking of autoclaved aerated concrete. One key factor involves the steam-free aeration process. The thickness of the adsorbed water layer between particles depends on the relative humidity within the system. When humidity decreases, the water layer becomes thinner, reducing the disassembly pressure between solid particles. This leads to shrinkage deformation as the distance between particles decreases. Capillary pressure also changes from saturated to unsaturated conditions. The shrinkage due to capillary water loss accounts for approximately 80% of the total shrinkage under normal conditions, occurring when the relative humidity drops from 95% to 50%. As the material dries, the water level in the capillaries lowers, forming a meniscus with a certain radius (r). Surface tension (γ) acting on the meniscus creates a pressure difference inside the capillary, which increases as the relative humidity decreases. This pressure difference contributes significantly to shrinkage in aerated concrete. However, larger pores have less capillary suction, so moisture absorption is mainly controlled by the smaller pores' capillary forces. Another contributing factor is the disassembly pressure between adjacent particles. In a given system, a thin layer of water molecules is adsorbed between solid particles. When this layer becomes thicker than the natural spacing between particles, it generates a repulsive force that can lead to structural instability and cracking. Additionally, surface tension on colloidal particles plays a role in the overall stability of the material. These combined factors contribute to the complex behavior of aerated concrete, especially under varying environmental conditions. For more detailed insights, you can refer to expert discussions on the topic at [http://news.chinawj.com.cn](http://news.chinawj.com.cn). Submission:

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