Shushuai Wang, Renshu YANG, Yongliang Li, and Zhongwen Yue, Effects of cement content, polypropylene fiber length and dosage on fluidity and mechanical properties of fiber–toughened cemented aeolian sand backfill (FCASB), Int. J. Miner. Metall. Mater.,(2024). https://doi.org/10.1007/s12613-024-2885-9
Cite this article as:
Shushuai Wang, Renshu YANG, Yongliang Li, and Zhongwen Yue, Effects of cement content, polypropylene fiber length and dosage on fluidity and mechanical properties of fiber–toughened cemented aeolian sand backfill (FCASB), Int. J. Miner. Metall. Mater.,(2024). https://doi.org/10.1007/s12613-024-2885-9
Research Article

Effects of cement content, polypropylene fiber length and dosage on fluidity and mechanical properties of fiber–toughened cemented aeolian sand backfill (FCASB)

+ Author Affiliations
  • Received: 19 November 2023Revised: 17 March 2024Accepted: 18 March 2024Available online: 19 March 2024
  • Using aeolian sand (AS) for goaf backfilling allows coordination of green mining and AS control. Cemented AS backfill (CASB) exhibits brittle fracture. Polypropylene (PP) fibers are good toughening materials. When the toughening effect of fibers is analyzed, their influence on the slurry conveying performance should also be considered. Additionally, cement affects the interactions among the hydration products, fibers, and aggregates. In this study, the effects of cement content (8wt%, 9wt% and 10wt%), PP fiber length (6, 9 and 12 mm) and dosage (0.05wt%, 0.1wt%, 0.15wt%, 0.2wt% and 0.25wt%) on fluidity and mechanical propertity of the fiber–toughened CASB (FCASB) were analyzed. The results indicated that with increases in the three aforementioned factors, the slump flow decreased, while the rheological parameters increased. Uniaxial compressive strength (UCS) increased with the increase of cement content and fiber length, and with an increase in fiber dosage, it first increased and then decreased. The strain increased with the increase of fiber dosage and length. The effect of PP fibers became more pronounced with the increase of cement content. Digital image correlation (DIC) test results showed that the addition of fibers can restrain the peeling of blocks and the expansion of fissure, and reduce the stress concentration of the FCASB. Scanning electron microscopy (SEM) test indicated that the functional mechanisms of fibers mainly involved the interactions of fibers with the hydration products and matrix, and the spatial distribution of fibers. On the basis of single–factor analysis, the response surface method (RSM) was used to analyze the effects of the three aforementioned factors and their interaction terms on the UCS. The influence surface of the two-factor interaction terms and the three-dimensional scatter plot of the three–factor coupling were established. In conclusion, the response law of the FCASB properties under the effects of cement and PP fibers were obtained, which provides theoretical and engineering guidance for FCASB filling.

  • loading
  • 加载中

Catalog

    通讯作者: 陈斌, bchen63@163.com
    • 1. 

      沈阳化工大学材料科学与工程学院 沈阳 110142

    1. 本站搜索
    2. 百度学术搜索
    3. 万方数据库搜索
    4. CNKI搜索

    Share Article

    Article Metrics

    Article Views(38) PDF Downloads(3) Cited by()
    Proportional views

    /

    DownLoad:  Full-Size Img  PowerPoint
    Return
    Return