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首页> 外文学位 >Effects of rebar temperature and water to cement ratio on rebar-concrete bond strength of concrete containing fly ash.
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Effects of rebar temperature and water to cement ratio on rebar-concrete bond strength of concrete containing fly ash.

机译：钢筋温度和水灰比对粉煤灰混凝土钢筋混凝土粘结强度的影响。

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摘要

This research presents the results on an experimental investigation to identify the effects of rebar temperature, fly ash and water to cement ratio on concrete porosity in continuously reinforced concrete pavements (CRCP). Samples were cast and analyzed using pullout tests. Water to cement ratio (w/c) and rebar temperature had a significant influence on the rebar-concrete bond strength. The 28-day shear strength measurements showed an increase in rebar-concrete bond strength as the water to cement ratio (w/c) was reduced from 0.50 to 0.40 for both fly ash containing and non fly ash control samples. There was a reduction in the peak pullout load as the rebar surface temperature increased from 77° F to 150° F for the cast samples. A heated rebar experiment was performed simulating a rebar exposed to hot summer days and the rebar cooling curves were plotted for the rebar temperatures of 180°F-120° F. Fourier transform infrared spectroscopy was performed to show the moisture content of cement samples at the rebar-concrete interface. Mercury intrusion porosimetry test results on one batch of samples were used for pore size distribution analysis. An in-depth analysis of the morphological characteristics of the rebar-concrete interface and the observation of pores using the scanning electron microscope (SEM) was done.
机译：这项研究提出了一项实验研究的结果，以确定钢筋温度，粉煤灰和水灰比对连续增强混凝土路面（CRCP）中混凝土孔隙率的影响。浇铸样品并使用拉拔测试进行分析。水灰比（w / c）和钢筋温度对钢筋混凝土粘结强度有重要影响。 28天的剪切强度测量结果表明，对于粉煤灰控制样品和非粉煤灰控制样品，水灰比（w / c）从0.50降低至0.40，钢筋混凝土粘结强度有所提高。当铸件样品的钢筋表面温度从77°F升高到150°F时，峰值拔出载荷降低。进行了加热的钢筋实验，模拟了暴露在炎热夏季的钢筋，并绘制了钢筋温度为180°F-120°F的钢筋冷却曲线。进行了傅里叶变换红外光谱分析，显示了水泥样品在水温下的含水量。钢筋混凝土界面。一批样品的汞侵入孔隙率测试结果用于孔径分布分析。对钢筋混凝土界面的形态特征进行了深入分析，并使用扫描电子显微镜（SEM）观察了孔。

著录项

  • 作者

    Pati, Ardeep Ranjan.;

  • 作者单位

    University of North Texas.;

  • 授予单位 University of North Texas.;
  • 学科 Engineering Civil.;Engineering Mechanical.
  • 学位 M.S.
  • 年度 2010
  • 页码 89 p.
  • 总页数 89
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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