| 引用本文: | 延常玉,李宏波,张虎彪, 等.水泥粉煤灰炉渣煤矸石混合料的力学性能试验研究[J].灌溉排水学报,2022,41(3):125-135. |
| YAN Changyu,LI Hongbo,ZHANG Hubiao, et al.水泥粉煤灰炉渣煤矸石混合料的力学性能试验研究[J].灌溉排水学报,2022,41(3):125-135. |
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| 摘要: |
| 【目的】研究水泥粉煤灰稳定炉渣-煤矸石混合料的力学性能，解决宁夏地区粉煤灰、炉渣和煤矸石等工业废渣大量堆积的问题。【方法】开展不同水泥掺量（3%、4%、5%、6%）及炉渣替代率（0%、25%、50%、75%、100%）混合料的无侧限抗压强度试验、劈裂强度试验、三轴试验和超声波试验，在此基础上，进行了5%水泥掺量50%炉渣替代率混合料的微观机理分析。【结果】炉渣替代率的增加会降低混合料的强度，而水泥掺量的增加会增大混合料的强度；建立了试件的无侧限抗压强度和劈裂强度的关系模型；在三轴试验中，试件的破坏形态受围压影响较大且表现为典型的剪切破坏；根据试验结果，拟合得到了炉渣替代率、水泥掺量与峰值应力和围压之间的关系公式；根据扫描电镜检测结果，发现试件的主要水化产物为C-S-H、AFt等；根据超声波试验结果，试件的无侧限抗压强度与振幅之间呈正相关性。【结论】因此，将粉煤灰、炉渣和煤矸石混合料用作大坝和路面基层铺筑可行，为粉煤灰、炉渣和煤矸石混合料的工程应用提供参考。 |
| 关键词: 破坏形态；力学性能；粉煤灰；炉渣-煤矸石；三轴试验；微观机理 |
| DOI：10.13522/j.cnki.ggps.2021427 |
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| Mechanical Properties of Fly Ash Mixed with Furnace Slag-coal Gangue |
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YAN Changyu, LI Hongbo, ZHANG Hubiao, et al
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1. School of Civil and Water Conservancy Engineering, Ningxia University, Yinchuan 750021, China;
2. Ningxia Engineering Technology Research Center for Water Saving Irrigation and Water Resources Regulation, Yinchuan 750021, China;
3. Ningxia Engineering Technology Research Center for Civil Engineering Seismic and Disaster Mitigation, Yinchuan 750021, China
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| Abstract: |
| 【Objective】Fly ashes mixed with furnace slag-coal gangue have been increasingly used as a building material in Ningxia province of China. This paper analyzes the change in its mechanical properties at different mixing ratios.【Method】Fly ashes were mixed with cement at ratio of 3%, 4%, 5% and 6%, and with slag-coal gangue at 0%, 25%, 50%, 75% and 100%, respectively. The mechanical properties of each specimen were measured using triaxial test and ultrasonic test, from which we established the relationship between the unconfined compressive strength and the splitting strength for all treatments. 【Result】The damage pattern of the specimens in the triaxial test was mediated by the surrounding pressure, showing a typical shear failure. The strength of all specimens can be estimated using slag content, cement content and the surrounding pressure. The scanning electron microscopy showed that the main hydration products of the specimens were C-S-H and Aft. The ultrasonic test revealed that the unconfined compressive strength of the specimens was positively correlated to the amplitude.【Conclusion】After reinforcing the fly ash with slag-coal gangue at appropriate ratio, it can be used as a building materials for dam and pavement construction. |
| Key words: damage morphology; mechanical properties; fly ash; furnace slag-coal gangue; triaxial test; micromechanism |
