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首页> 外文学位 >Beneficial use of off-specification fly ashes to increase the shear strength and stiffness of expansive soilrubber (ESR) mixtures.
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Beneficial use of off-specification fly ashes to increase the shear strength and stiffness of expansive soilrubber (ESR) mixtures.

机译：有益地使用不合规格的粉煤灰来增加膨胀土壤橡胶（ESR）混合物的剪切强度和刚度。

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摘要

The potential use of off-specification fly ashes to increase the shear strength and stiffness of an expansive soil-rubber (ESR) mixture was investigated systematically in this study. The off-specification fly ashes used included a high sulfur content fly ash and a high carbon content fly ash. A standard Class C fly ash was also used as a control fly ash to develop a basis for comparison of the effects of the off-specification fly ashes. The ESR mixture consisted of high-plasticity clay blended with 20% 6.7-mm granulated rubber (by weight). The fly ash content required to develop pozzolanic reactions was determined based on the concept of lime fixation point and kept constant for all ESR-fly ash mixtures. At this selected fly ash content, ESR-fly ash mixtures were tested at a single relative compaction level and curing times of 7 and 14 days. Unconfined compression testing was performed on compacted specimens to validate the fly ash content selected and the effect of curing time on the development of pozzolanic reactions. The effect of the fly ash type, curing time and mean effective stress was evaluated by performing isotropically consolidated undrained triaxial compression tests on saturated specimens at mean effective stress levels of 50, 100 and 200 kPa. Stiffness changes due to fly ash addition were evaluated during undrained compression. Large-strain stiffness was measured using conventional external displacement transducers. Very-small strain stiffness was evaluated from shear wave velocity measurements using a bender element apparatus. Results suggest that the shear strength and stiffness improvements imparted by the off-specification fly ashes is similar to or better than the improvements imparted by conventional Class C fly ash.
机译：在这项研究中，系统地研究了不合规格的粉煤灰可能用于增加膨胀土-橡胶（ESR）混合物的剪切强度和刚度。使用的不合格粉煤灰包括高硫含量的粉煤灰和高碳含量的粉煤灰。标准的C级粉煤灰也用作对照粉煤灰，以为比较不合格粉煤灰的效果奠定基础。 ESR混合物由高塑性粘土与20％6.7 mm粒​​状橡胶（按重量计）混合而成。火山灰反应所需的粉煤灰含量是根据石灰固定点的概念确定的，并且对于所有ESR-粉煤灰混合物均保持恒定。在此选定的粉煤灰含量下，以单一相对压实水平和7到14天的固化时间测试了ESR-粉煤灰混合物。在压实样品上进行了无边压缩试验，以验证所选粉煤灰含量以及固化时间对火山灰反应发展的影响。通过在50、100和200 kPa的平均有效应力水平下对饱和试样进行各向同性固结不排水三轴压缩试验，评估了粉煤灰类型，固化时间和平均有效应力的影响。在不排水的压缩过程中，评估了由于添加粉煤灰引起的刚度变化。使用传统的外部位移传感器测量大应变刚度。使用弯曲机元件设备通过剪切波速度测量来评估非常小的应变刚度。结果表明，不合规格的粉煤灰所赋予的剪切强度和刚度的改善与常规C类粉煤灰所赋予的改善相似或更好。

著录项

  • 作者

    Wiechert, Ethan Patrick.;

  • 作者单位

    Colorado State University.;

  • 授予单位 Colorado State University.;
  • 学科 Engineering Civil.
  • 学位 M.S.
  • 年度 2011
  • 页码 150 p.
  • 总页数 150
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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