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加筋粉煤灰的静动强度指标试验与研究 总被引:9,自引:0,他引:9
从加筋机理入手,本文建立了加筋土强度的等效侧向约束力模型。分析了加筋粉煤灰静、动强度的拉力破坏和粘着破坏两种情况下的强度指标。理论分析得到了试验结果的验证。 相似文献
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用热压方法制备了不同粉煤灰粒度及含量的聚氯乙烯(PVC)复合材料,在MM—200型环—块摩擦磨损试验机上评价了复合材料同淬火45^#钢在干摩擦条件下对摩时的摩擦磨损性能,用扫描电子显微镜及光学显微镜观察分析磨损表面.结果表明:当粉煤灰质量分数为40%时,填充PVC复合材料的硬度最高,相应的磨损率最低,比纯PVC的磨损率低2个数量级以上;粉煤灰粒度越小,复合材料的硬度越高,耐磨性越好. 相似文献
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Understanding of the dynamic particulate flow structures within a dense gas-fly ash pneumatic conveyor must be improved in order to better aid its design guidance.The complex pulsatile movement of the gas-fly ash mixture dominates the flow performance within the pipeline,and historically,non-invasive measurement devices such as the electrical capacitance tomography(ECT) were often used to sufficiently capture the flow dynamics.However,inadequate studies have been conducted on the pulsatile flow phenomenon,which directly relate to the gas-fly ash two-phase flow performance.This paper aims to investigate the pulsatile flows using an ECT device.Initially,pulsatile flow patterns under various experimental conditions were obtained through ECT.Pulses within a flow were then characterised into pulse growth and decay segments,which represent the superficial fluidisation and deaeration processes during conveying.Subsequently,structural and statistical analyses were performed on the pulse growth and decay segments.Results suggested that the increasing air mass flow rate led to the decrease of the superficial fluidisation/deaeration magnitude,however,the increase of the superficial fluidisation/deaeration durations.Also,the air mass flow rate was indicated as the dominant factor in determining the pulsing statistical parameters.This research provides fundamental insights for further modelling the dense fly ash pneumatic flows. 相似文献
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为系统研究粉煤灰、吸水保水剂(SAP)对喷射混凝土早龄期开裂损伤的影响,以掺入了粉煤灰、SAP的喷射混凝土为研究对象,对喷射混凝土的早龄期开裂损伤进行平板法试验研究。完成了各种试件的早龄期开裂损伤测试,研究了粉煤灰对喷射混凝土以及SAP对掺入20%粉煤灰喷射混凝土的早龄期开裂损伤的改善作用。试验结果表明,掺粉煤灰等量取代10%、20%水泥后,喷射混凝土的早龄期开裂损伤与基准喷射混凝土相比分别减小约7.2%和26.8%。掺0.25%SAP和0.5%SAP可以使20%粉煤灰掺量喷射混凝土的早龄期开裂损伤与基准喷射混凝土相比分别减小约57.9%和66.50%。因此, 掺粉煤灰可有效地降低喷射混凝土早龄期开裂损伤,且在掺加粉煤灰的基础上再掺加适量的SAP效果会更佳。 相似文献
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对于高有机质含量的泻湖相软土,单纯采用水泥不能有效提高该软土的力学性能,因此提出了采用水泥和粉煤灰作为固化剂的加固方法。通过不同水泥掺入量、粉煤灰掺入量和龄期下水泥土的无侧限抗压强度试验,分析了水泥粉煤灰固化土的强度规律和变形规律,探讨了水泥和粉煤灰加固高有机质含量软土的机理。结果表明,粉煤灰对于水泥试块的早期强度影响较小,对后期强度影响较大;粉煤灰最佳掺入量为12%,超过此掺入量水泥土强度反而会降低,粉煤灰水泥土的破坏应变、E50也在粉煤灰掺量为12%时分别达到最低值和最大值。水泥掺加粉煤灰可有效地提高高有机质含量软土的强度。 相似文献
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粉煤灰砌块砌体的研究与应用对节能降耗、保护环境、加快推广新型墙体材料的应用具有十分重要的意义.通过粉煤灰小型空心砌块砌体的抗压强度试验和沿通缝截面抗剪强度试验,对其强度、本构关系和弹性模量等基本力学性能进行了分析研究,并结合我国现行规范中已有的砌块砌体计算公式,提出了粉煤灰小型空心砌块砌体的抗压抗剪强度计算公式、应力应变曲线以及弹性模量的计算方法.经分析,其计算结果与试验值吻合较好,填补了规范中粉煤灰砌块基本力学性能分析研究的空白,并为今后工程设计提供了基本技术参数支持和理论参考. 相似文献
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