Mei Lifang, Huang Yiwen, Xiang Dali
School of Civil Engineering, Architectural and Environment, Hubei University of Technology, Wuhan 430068, China.
Key Laboratory of Intelligent Health Perception and Ecological Restoration of Rivers and Lakes, Ministry of Education, Wuhan 430068, China.
Polymers (Basel). 2024 Dec 18;16(24):3517. doi: 10.3390/polym16243517.
Expanded polystyrene (EPS) bead-lightweight soil composites are a new type of artificial geotechnical material with low density and high strength. We applied EPS bead-lightweight soil in this project, replacing partial cement with fly ash to reduce construction costs. EPS beads were used as a lightweight material and cement and fly ash as curing agents in the raw soil were used to make EPS lightweight soil mixed with fly ash. The EPS bead proportions were 0.5%, 1%, 1.5%, and 2%; the total curing agent contents were 10%, 15%, 20%, and 25%; and the proportions of fly ash replacing cement were 0%, 15%, 30%, 45%, and 60%, respectively. Unconfined compressive strength (UCS) and scanning electron microscopy (SEM) tests were conducted. The results showed that the EPS content, total curing agent content, and proportion of fly ash replacing cement had a significant impact on the UCS of the lightweight soil. This decreased with an increase in EPS content and decrease in total curing agent content and decreased with increased proportions of fly ash replacing cement. When the proportion of fly ash replacing cement was not too high, the strength of the lightweight soil decreased less, and its performance still met engineering needs. At the same time, the soil can also consume fly ash and reduce environmental pollution. EPS lightweight soil mixed with fly ash still has advantages, and it is recommended to keep the proportion of fly ash replacing cement less than 30%. The failure patterns for lightweight soil mainly include splitting failure, oblique shear failure, and bulging failure, which are related to the material mix ratio.
聚苯乙烯泡沫颗粒（EPS）轻质土复合材料是一种新型的低密度、高强度人工岩土材料。本项目应用了EPS轻质土，用粉煤灰替代部分水泥以降低建设成本。EPS颗粒作为轻质材料，与原土中的水泥和粉煤灰作为固化剂一起制成掺粉煤灰的EPS轻质土。EPS颗粒比例分别为0.5%、1%、1.5%和2%；固化剂总含量分别为10%、15%、20%和25%；粉煤灰替代水泥的比例分别为0%、15%、30%、45%和60%。进行了无侧限抗压强度（UCS）试验和扫描电子显微镜（SEM）试验。结果表明，EPS含量、固化剂总含量以及粉煤灰替代水泥的比例对轻质土的UCS有显著影响。随着EPS含量的增加和固化剂总含量的降低，UCS降低，且随着粉煤灰替代水泥比例的增加而降低。当粉煤灰替代水泥的比例不太高时，轻质土强度降低较小，其性能仍满足工程需求。同时，该土还可消耗粉煤灰，减少环境污染。掺粉煤灰的EPS轻质土仍具有优势，建议将粉煤灰替代水泥的比例控制在30%以内。轻质土的破坏模式主要包括劈裂破坏、斜剪破坏和鼓胀破坏，这与材料配合比有关。
