用Soma粉煤灰稳定含硫酸盐膨胀粘土

IF 1.827 Q2 Earth and Planetary Sciences
Mehmet As, Erdal Cokca
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引用次数: 0

摘要

用石灰稳定含有硫酸盐的膨胀土不能有效地减轻这些土壤由于钙矾石(一种高度膨胀的矿物)的出现而产生的膨胀行为。本研究评估了使用15% Soma粉煤灰(SFA)代替4%石灰(L)增强含硫酸盐膨胀土抗膨胀稳定性的有效性。为了最大限度地降低膨胀势,同时抑制钙矾石的形成,研究了SFA稳定膨胀硫酸盐粘土的最大允许SO4含量。采用指数、膨胀和无侧限抗压强度(UCS)试验,结合扫描电镜(SEM)和x射线衍射(XRD)分析,评价了粉煤灰对含硫酸盐膨胀土性能的影响。SO4浓度对处理后试样的膨胀势有不同的影响。当添加4%的L时,膨胀性硫酸盐粘土的膨胀势明显增加,但当添加15%的SFA时,膨胀性硫酸盐粘土的膨胀势没有显著增加。两种添加剂处理后膨胀性硫酸盐粘土试样的单轴抗压强度普遍降低。膨胀硫酸盐粘土经15% SFA处理后,暴露于27,000 ppm SO4中,在10°C下固化,强度显著降低,主要是由于钙矾石/梭马石和芒硝形成。结果表明,在SO4浓度低于阈值6750 ppm的条件下,15% SFA可以安全稳定含SO4的膨胀土,不会引起膨胀土的鼓胀和耐久性问题。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Stabilization of an expansive clay containing sulfate with Soma fly ash

Stabilization of an expansive clay containing sulfate with Soma fly ash

Stabilization of an expansive clay containing sulfate with Soma fly ash

Stabilization of an expansive soil containing sulfate with lime fails to effectively mitigate the swelling behavior of these soils as a result of the occurrence of ettringite, a highly expansive mineral. This study evaluated the effectiveness of utilizing 15% Soma fly ash (SFA) as an alternative to 4% lime (L) in enhancing the stability of expansive soil containing sulfate (SO4) against swelling. Maximum allowable SO4 content for the stabilization of the expansive sulfate clay with SFA was investigated to achieve the greatest reduction in swell potential and simultaneously inhibit the formation of ettringite. Index, swelling, and unconfined compressive strength (UCS) tests, together with scanning electron microscope (SEM) views and X-ray diffraction (XRD) analysis, were used to assess the impact of fly ash on the behavior of sulfate-bearing expansive soil. SO4 concentration exhibited varying effects on the swell potential of treated specimens. A noticeable increase in the swell potential of expansive sulfate clay was observed when treated with 4% L, but no significant increase was observed when treated with 15% SFA. The UCS of the expansive sulfate clay specimens treated with both additives generally decreased. A significant reduction in strength was recorded for expansive sulfate clay treated with 15% SFA and exposed to 27,000 ppm SO4 when cured at 10 °C, primarily due to ettringite/thaumasite and thenardite formation. The results indicated that 15% SFA can be safely used for stabilizing expansive soils containing SO4 without causing heave or durability problems, provided that the SO4 concentration of the expansive soil is below the threshold level of 6750 ppm.

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来源期刊
Arabian Journal of Geosciences
Arabian Journal of Geosciences GEOSCIENCES, MULTIDISCIPLINARY-
自引率
0.00%
发文量
1587
审稿时长
6.7 months
期刊介绍: The Arabian Journal of Geosciences is the official journal of the Saudi Society for Geosciences and publishes peer-reviewed original and review articles on the entire range of Earth Science themes, focused on, but not limited to, those that have regional significance to the Middle East and the Euro-Mediterranean Zone. Key topics therefore include; geology, hydrogeology, earth system science, petroleum sciences, geophysics, seismology and crustal structures, tectonics, sedimentology, palaeontology, metamorphic and igneous petrology, natural hazards, environmental sciences and sustainable development, geoarchaeology, geomorphology, paleo-environment studies, oceanography, atmospheric sciences, GIS and remote sensing, geodesy, mineralogy, volcanology, geochemistry and metallogenesis.
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