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通过矿物成分分析、化学成分分析、颗粒分析、界限含水率、自由膨胀率等试验对全风化千枚岩试样的物理化学和水理性质进行了系统分析,研究了其用于铁路路基填料的适用性。研究表明试验选取的全风化千枚岩为C3组填料,满足重载铁路基床以下路堤填料要求。 相似文献
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以千枚板岩为研究对象,通过对其矿物成分、崩解性、膨胀性与压缩性、软化性等试验分析,并结合软岩填料的强度与击实试验结果,初步得出千枚板岩填筑路基能满足路基沉降稳定的要求及能否作为路用填料主要受填料浸水软化后强度衰减因素控制的结论. 相似文献
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介绍对使用硅灰石粉、石灰石粉、重质碳酸钙和滑石粉4种不同种类的填料的沥青混合料,利用马歇尔试验方法进行了试验安排和性能评价,分析了不同种类的填料对沥青混合料的马歇尔试验结果的影响,从而最终确定填料与集料的最佳组合及其最佳油石比。试图找到一种性能良好,经济合理的修补用沥青混合料,以指导高等级公路沥青路面的管理与维护工作。 相似文献
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以磷石膏废料为路基填料,可降低环境污染,减少公路修建成本。通过室内试验测试了改性磷石膏废料的承载比、无侧限抗压强度、水稳定性、干湿循环特性和膨胀性,表明改性磷石膏废料的强度、水稳定性、膨胀性满足公路工程路基填料的要求。通过电镜扫描试验,分析了煅烧磷石膏改性磷石膏的机理。试验路检测表明煅烧磷石膏改性磷石膏作为路基填料具有可行性。 相似文献
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为研究石英砂填料对环氧胶结料的性能影响,利用动态剪切流变试验(DSR)和万能试验机对掺加石英砂填料的环氧基体材料分别进行流变性能和力学性能试验研究。试验结果表明:粒径212μm、掺量20%的石英砂填料具有较好性能;掺石英砂改性环氧抗滑表层材料的路用性能满足规范要求;结合公路常规性能试验分析,得到石英砂改性环氧基体材料在实际道路铺装工程方面具有明显优势。 相似文献
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笔者试验了重钙、滑石粉和轻钙三种细填料对脱硫石膏自流平浆体抗泌水离析性能的影响,通过粒径分布分析了细填料对浆体抗泌水离析作用的机理;试验了普通硅酸盐水泥和硫铝酸盐水泥对脱硫石膏自流平材料绝干抗折、抗压强度的影响。并最终配制出满足JC/T1023-2007要求的石膏基自流平材料。 相似文献
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本文通过在饱和粘性地基上进行的直接填料碾压、铺土工格栅后填料碾压的对比试验,以及处理效果对比的载荷试验,通过分析对比,提出了在一定条件下使用土工格栅取代原地基处理,使填料可被有效压实,以满足上部构筑物的变形及强度要求。 相似文献
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高速铁路碎石类A、B组填料的动力特性研究 总被引:2,自引:0,他引:2
针对碎石类A、B填料填筑的高速铁路路基的长期动变形稳定性问题,以室内短时动三轴试验为依托,依据高速铁路路基的工作条件,建立动三轴试验模型,对碎石类A、B组填料的基床底层和路基本体进行了动模量和阻尼比试验研究,提出了压实度、围压等是动模量和阻尼比最主要影响因素及其相关性;建立了考虑压实度、围压影响的动模量、阻尼比与动剪应变之间的关系模型,证实了动应力-动应变关系可用修正的Hardin-Drnevich模型进行描述,对高速铁路长期动变形稳定性的深入研究具有重要意义。 相似文献
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Stabilization of sodium oleate as calcium oleate in cement-based mortars made with limestone fillers
This paper looks at the interaction between natural limestone fillers and sodium oleate, a waterproofing agent used in rendering mortars, which, despite being water soluble is very effective as waterproofing in cement-based mortars at very low dosages. The present paper shows that the surfactant is stabilized by the formation of insoluble calcium oleate coatings on the surface of limestone fillers. The reaction between sodium oleate and calcium carbonate from the filler was followed by conductivity measurements and confirmed by infrared spectroscopy bands and scanning electronic microscopy. The proposed method is recommended for studying the foaming activity of the surfactant and compared with the conventional foam index test. 相似文献
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为了探究不同施工与应用条件对灌缝材料粘附性的影响规律,分别在不同的湿度、腐蚀环境、温度和切缝工艺条件下设计对应的试验方案,通过多功能测试仪对不同方案下的成型的试件进行拉伸试验,根据拉伸试验结果对不同试样的粘附性进行定量的评价。结果表明:水降低了灌缝料的粘附性;腐蚀作用下灌缝胶粘附性基本消失;切缝处理对灌缝料的粘附性能产生较大幅度的削弱;温度冷热循环对灌缝料的粘附性能造成一定性能损失。 相似文献
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Laboratory investigations of low temperature physical hardening of bitumen using a Bending Beam Rheometer (BBR) are described. The study encompasses five bitumens, three conditions with regard to additives and three testing temperatures (−15, −25 and −30°C). As additives, two fillers, hydrated lime and calcium carbonate, were used. The effect of the fillers on the isothermal low temperature hardening was evaluated with the aid of a physical hardening index. The viscoelastic nature of the bitumens and bitumen/filler mixtures was investigated utilising the Burger model, and the Burger parameters were used to calculate dissipation energy ratios (dissipated energy over stored energy) in each BBR test. The results obtained did not indicate any significant effect of the fillers on low temperature physical hardening. Analyses of the dissipation energy ratio showed a considerable capacity for energy dissipation, even at a temperature as low as −30°C. With few exceptions, more energy was dissipated than stored during a BBR test. It appears that the dissipation energy ratio is not necessarily related to the stiffness of the binder. 相似文献
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用粉煤灰,滑石粉,硅灰等代替石粉,进行了马歇尔、车辙及残留稳定度试验,通过比较分析,从而找到一种能提高沥青混合料路用性能的理想填料,并通过试验检查这些填料对沥青混合料的实际影响,为实际应用提供一定技术支持。 相似文献
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针对砂砾卵石混合料压实特性离散的特点,对其干密度与碾压速度的关系、干密度与碾压遍数的关系进行了深入的压实研究,通过对碾压前、碾压4遍、碾压6遍的筛分试验,对到粗粒填料压实前后的粒度成分的变化规律进行了研究。 相似文献
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蜂窝式空心无梁楼盖板的挠度计算 总被引:2,自引:0,他引:2
根据等代框架法的基本原理,提出了蜂窝式空心无梁楼盖板的挠度计算方法,给出了这种空心无梁楼盖板刚度的计算公式,并介绍了这种空心无梁楼盖板使用的埋入式内模。与试验结果的比较验证了该方法的合理性。最后给出了一个算例说明了该方法的应用。 相似文献
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Álvaro García Erik Schlangen Martin van de Ven Quantao Liu 《Construction and Building Materials》2009,23(10):3175-3181
The objective of this research is to examine the conductivity of asphalt mortar through the addition of electrically conductive fillers and fibers: graphite and steel wool, and prove that this material can be heated with induction energy. The effect of fibers content, sand–bitumen ratio and the combination of fillers and fibers on the resistivity of asphalt mortar was investigated. It was found that the percolation threshold happened sooner by adding electrically conductive fibers than by adding fillers. Percolation threshold was also found to be function of the sand–bitumen ratio and of the volume of fibers content. There is an optimum content of fibers for each sand–bitumen ratio, above which it is difficult to make the mixture and the electrical resistivity increases exponentially. Besides, in case of adding conductive fillers or a mixture of conductive fibers and fillers to the mastic, once the maximum conductivity is reached, it remains constant, independently of the volume of conductive filler added. Nano CT-scan (computed axial tomography) reconstructions were also used to visualize the fibers connected inside the mixture. Finally, to validate the research, three different samples were induction heated and their temperature variation was measured. 相似文献
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在聚氨酯防水嵌缝材料的研制中,对填料进行了筛选。研究了三种填料含量变化对嵌缝材料性能的影响,并对嵌缝材料进行了加速老化试验。结果为,添加80份海泡石的聚氨酯防水嵌缝材料性能最佳。 相似文献