Semi-quantification of cementing products using X-ray diffraction technique in stabilized aggregate
Semi-quantification of cementing products using X-ray diffraction technique in stabilized aggregate
复制标题
使用 X 射线衍射技术对稳定骨料中的胶结产物进行半定量
DOI：
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发表时间：
2006
影响因子：
3
通讯作者：
J. G. Laguros
中科院分区：
文献类型：
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作者：
N. Khoury;M. Zaman;J. G. Laguros
对不同稳定剂（C类粉煤灰、水泥窑灰和流化床灰）稳定石灰石骨料基层的性能进行了实验研究。在进行无侧限抗压强度（UCS）、扫描电镜、能量色散光谱和x射线衍射测试之前，将圆柱形试样压实并固化1小时、3天和28天。结果表明，随着固化时间的延长，UCS值逐渐增大。不同的稳定剂产生不同的UCS值。采用参考强度比（RIR）法对混合物中矿物和胶结物的质量百分比进行了鉴定和定量。结果表明，钙矾石、C-S-H、C-A-H和C-A-S-H等胶结化合物的形成是导致UCS值升高的主要原因。在本研究中，随着养护时间的延长，所有胶结物（SCC）的总和呈现出与UCS相同的选矿趋势。最后，UCS值与SCC有很好的相关性。SEM显微图显示，随着固化时间的延长和添加剂添加量的增加，晶体形成和水化涂层强度增大。
A laboratory study was undertaken to investigate the performance of limestone aggregate base stabilized with different stabilizing agents, namely, class C fly ash, cement kiln dust and fluidized bed ash. Cylindrical specimens were compacted and cured for 1 hour, 3 days and 28 days prior to tests of unconfined compressive strength (UCS), scanning electron microscopy, energy-dispersive spectrometry and X-ray diffraction. Results showed that the UCS values increased with curing time. It was also found that the different stabilizing agents produced different UCS values. The reference intensity ratio (RIR) method was employed to identify and quantify the mass percent of minerals and cementing compounds in the mixtures. Results revealed the formation of cementing compounds such as ettringite, C-S-H, C-A-H and C-A-S-H, which were responsible for an increase in the UCS values. In this study, the sum of all the cementing compounds (SCC) showed the same beneficiation trend as the UCS trend with curing time. Finally, the UCS values correlated fairly well with SCC. The SEM micrographs showed the intensity of crystal formation and hydration coating, which increased with curing time and percentage of additive.