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Effects of cement content, polypropylene fiber length and dosage on fluidity and mechanical properties of fiber-toughened cemented aeolian sand backfill

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International Journal of Minerals,Metallurgy and Materials 2024年第11期31卷 2404-2416页

作者： Shushuai Wang Renshu Yang Yongliang Li Zhongwen Yue School of Mechanics and Civil Engineering China University of Mining and Technolog(Beijing)Beijing 100083China School of Civil and Resource Engineering University of Science and Technology BeijingBeijing 100083China School of Energy and Mining Engineering China University of Mining and Technology(Beijing)Beijing 100083China

Using aeolian sand(AS)for goaf backfilling allows coordination of green mining and AS *** AS backfill(CASB)exhibits brittle ***(PP)fibers are good toughening *** the toughening effect of fibers is analyzed,their influence on the slurry conveying performance should also be ***,cement affects the interactions among the hydration products,fibers,and *** this study,the effects of cement content(8wt%,9wt%,and 10wt%)and 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 properties of the fibertoughened CASB(FCASB)were *** results indicated that with increases in the three aforementioned factors,the slump flow decreased,while the rheological parameters *** 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 *** strain increased with the increase of fiber dosage and *** effect of PP fibers became more pronounced with the increase of cement *** 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 *** 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 *** 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 *** influence surface of the two-factor interaction terms and the three-dimensional scatter plot of the three-factor coupling were *** conclusion,the response law of the FCASB properties under the effects of cement and PP fibers were obtained,which provides theoretical and engineerin

关键词： polypropylene fibers fiber-toughened cemented aeolian sand backfill digital image correlation scanning electron microscopy response surface method

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