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

As research on aerated concrete continues to advance, experts have identified multiple factors that contribute to cracking. These causes are primarily grouped into several categories: production process issues, raw material quality, construction practices, expansion and shrinkage of the blocks, carbonation effects, temperature fluctuations, and freeze-thaw cycles. Despite repeated studies, the problem remains complex and multifaceted. Some researchers suggest that the main reasons for cracking in autoclaved aerated concrete can be traced back to various physical and chemical mechanisms. One key factor is the drying shrinkage caused by the loss of moisture from capillary pores. When the relative humidity in the environment decreases, the adsorbed water layer between particles becomes thinner, reducing the disassembly pressure. This leads to a reduction in the distance between solid particles, resulting in shrinkage deformation. The capillary pressure changes from saturation to unsaturated conditions, and the shrinkage caused by this process accounts for approximately 80% of the total shrinkage under normal conditions. This typically occurs when the relative humidity drops from 95% to 50%. As the water level in the capillary pores decreases, a meniscus forms with a radius (r). Under the influence of surface tension (σ) and the meniscus, the internal pressure of the water becomes lower than the external pressure. The relationship between relative humidity and capillary pressure difference can be described mathematically. As humidity decreases, the pressure difference within the capillary pores increases, leading to more significant shrinkage in the aerated concrete block. Additionally, larger pores have less capillary suction capacity, so moisture absorption is mainly influenced by the small pores. The adsorption of water molecules between adjacent particles also plays a role. When the thickness of the adsorbed water layer exceeds the natural spacing between particles, it generates a repulsive force that can lead to structural instability. Moreover, the surface tension of colloidal particles contributes to internal stresses, which may further exacerbate cracking under certain conditions. For more detailed insights, you can refer to expert discussions on the subject. Http://news.chinawj.com.cn Submission:

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