Background Phosphogypsum is a waste by-product during the production of phosphoric acid. It not only occupies landfill, but also pollutes the environment, which becomes an important factor restricting the sustainable development of the phosphate fertilizer industry. Research into cast-in-situ phosphogypsum will greatly promote the comprehensive utilization of stored phosphogypsum. The aim of this study was to clarify the mechanical properties of phosphogypsum. Methods Stress-strain relationships of cast-in-situ phosphogypsum were investigated through axial compressive experiments, and seismic performance of cast-in-situ phosphogypsum walls and aerated-concrete masonry walls were simulated based on the experimental results and using finite element analysis. Results The results showed that the stress-strain relationship fitted into a polynomial equation. Moreover, the displacement ductility index and the energy dissipation index of cast-in-situ phosphogypsum wall were 6.587 and 3.425, respectively. Conclusions The stress-strain relationship for earthquake-resistant performance of cast-in-situ phosphogypsum walls is better than that of aerated-concrete masonry walls. The curve of stress-strain relationship and the evaluation of earthquake-resistant performance provide theoretical support for the application of cast-in-situ phosphogypsum in building walls.

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现浇磷石膏的应力应变关系及抗震性能

背景 磷石膏是磷酸生产过程中的一种废弃副产品。不仅占用垃圾填埋场，还污染环境，成为制约磷肥行业可持续发展的重要因素。对现浇磷石膏的研究将极大地促进储存磷石膏的综合利用。本研究的目的是阐明磷石膏的力学性能。方法通过轴压试验研究现浇磷石膏的应力-应变关系，根据试验结果，采用有限元分析法对现浇磷石膏墙体和加气混凝土砌体墙体的抗震性能进行模拟。结果 结果表明应力-应变关系符合多项式方程。此外，现浇磷石膏墙体的位移延展性指数和耗能指数分别为6.587和3.425。结论现浇磷石膏墙体抗震性​​能的应力应变关系优于加气混凝土砌体墙体。应力应变关系曲线及抗震性能评价为现浇磷石膏在建筑墙体中的应用提供了理论支持。结论现浇磷石膏墙体抗震性​​能的应力应变关系优于加气混凝土砌体墙体。应力应变关系曲线及抗震性能评价为现浇磷石膏在建筑墙体中的应用提供了理论支持。结论现浇磷石膏墙体抗震性​​能的应力应变关系优于加气混凝土砌体墙体。应力应变关系曲线及抗震性能评价为现浇磷石膏在建筑墙体中的应用提供了理论支持。