In the frosty expanses of cold regions, constructing clay core walls in winter has always been a challenge, with freezing temperatures and temperature control posing significant hurdles. However, a novel solution has emerged in the form of paraffin-based phase-change-material mixed clay, or PCM-clay, and recent research is shedding light on how to optimize its use.
A team of researchers, led by LIU Donghai from the State Key Laboratory of Hydraulic Engineering Intelligent Construction and Operation at Tianjin University, has been delving into the compaction properties of PCM-clay. Their work, published in the journal *Yantu gongcheng xuebao* (which translates to *Rock and Soil Mechanics*), focuses on the discrete element simulation of the rolling process of PCM-clay with varying crystallinity.
The study addresses a critical gap in the understanding of how different crystallinity levels of PCM at various temperatures affect the compaction properties of PCM-clay. “Field rolling tests are costly and difficult to control in variable environments,” explains LIU. “Our research uses PFC 3D software to establish a discrete element model that simulates the rolling process under different PCM crystallinity, providing a more controlled and cost-effective approach.”
The team’s findings are significant for the energy sector, particularly in regions where temperature control is crucial. They discovered that increasing the vibratory force during compaction leads to better results, and that higher PCM crystallinity reduces the dry density of PCM-clay. However, by adjusting rolling parameters such as increasing the number of passes, reducing speed, and decreasing paving thickness, the compaction effect can be improved to match the maximum dry density achieved when PCM is not crystallized.
This research offers a new method for analyzing the compaction quality of PCM-clay at different construction temperatures, providing a theoretical basis for quality control in core walls with varying PCM crystallinity. “Our study can guide the construction industry in optimizing the use of PCM-clay, ensuring better performance in cold regions,” says LIU.
The implications for the energy sector are substantial. As the demand for energy-efficient building materials grows, PCM-clay presents a promising solution. The ability to control compaction quality at different temperatures can lead to more efficient construction processes and improved building performance, ultimately reducing energy consumption and costs.
This research not only advances our understanding of PCM-clay but also paves the way for future developments in construction materials and techniques. As the energy sector continues to evolve, innovations like these will be crucial in meeting the demands for sustainable and efficient building practices.