Jiang Ping, Chen Yewen, Song Xinjiang, Li Na, Wang Wei, Wu Erlu
School of Civil Engineering, Shaoxing University, Shaoxing 312000, China.
Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210098, China.
Polymers (Basel). 2022 May 13;14(10):1995. doi: 10.3390/polym14101995.
Using polypropylene (PP) fiber and cement to modify iron-ore tailing and applying it to road engineering is an effective way to reuse iron-ore tailing. The compressive properties and deformation characteristics of PP-fiber-and-cement-modified iron-ore tailing (FCIT) under traffic load were studied by the unconfined-compressive-strength (UCS) test and the dynamical-triaxial (DT) test. The test results indicated that the UCS and residual strength both increased with increasing PP-fiber content, and tensile and toughness properties were positively correlated with PP-fiber content. Moreover, the dynamic elastic modulus and damping of FCIT both showed a negative linear relationship with cycle time. It can be found from the test results that 0.75% was the best PP-fiber content to modify iron tailing sand in this work. Lastly, a prediction model was developed to describe the relationship between the cumulative plastic strain, PP-fiber content and cycle time, which can effectively capture the evolution law of the cumulative plastic strain with cycle time of FCITs at different PP-fiber contents.
使用聚丙烯（PP）纤维和水泥对铁矿石尾矿进行改性并将其应用于道路工程是实现铁矿石尾矿再利用的有效途径。通过无侧限抗压强度（UCS）试验和动三轴（DT）试验，研究了PP纤维和水泥改性铁矿石尾矿（FCIT）在交通荷载作用下的压缩性能和变形特性。试验结果表明，UCS和残余强度均随PP纤维含量的增加而提高，拉伸性能和韧性与PP纤维含量呈正相关。此外，FCIT的动弹性模量和阻尼均与循环次数呈负线性关系。从试验结果可以看出，在本研究中0.75%是改性铁尾矿砂的最佳PP纤维含量。最后，建立了一个预测模型来描述累积塑性应变、PP纤维含量和循环次数之间的关系，该模型能够有效地捕捉不同PP纤维含量的FCIT累积塑性应变随循环次数的演化规律。
