Enhancing soft subgrade soil with a sewage sludge ash/cement mixture and nano-silicon dioxide
| العنوان: | Enhancing soft subgrade soil with a sewage sludge ash/cement mixture and nano-silicon dioxide |
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| المؤلفون: | Darn-Horng Hsiao, Huan-Lin Luo, Chien-Ta Chen, Ming-Du Cai, Deng-Fong Lin |
| المصدر: | Environmental Earth Sciences. 75 |
| بيانات النشر: | Springer Science and Business Media LLC, 2016. |
| سنة النشر: | 2016 |
| مصطلحات موضوعية: | Cement, Global and Planetary Change, 0211 other engineering and technologies, Compaction, Soil Science, Geology, 02 engineering and technology, Subgrade, Atterberg limits, Pollution, Compressive strength, 021105 building & construction, Environmental Chemistry, Geotechnical engineering, Composite material, Biogeosciences, Nano silicon dioxide, Sludge, 021101 geological & geomatics engineering, Earth-Surface Processes, Water Science and Technology |
| الوصف: | In this study, a mixture of sewage sludge ash (SSA) and cement was applied to improve the properties of soft cohesive soil. In addition, nano-SiO2 was applied as an additive to the SSA/cement-treated soil. Four different mix ratios of SSA/cement (1:1, 2:1, 3:1, and 4:1) were used as stabilizers to improve the strength of the soft cohesive subgrade soil, and the total amount of SSA/cement added was fixed at 15 % of the soil weight. The effect of 2 % nano-SiO2 was also investigated. Experiments, including Atterberg limit measurements, compaction tests, unconfined compressive strength (UCS) tests, and scanning electron microscopy, were performed. The test results indicated that a mixture of SSA and cement improved the engineering properties of soft subgrade soil, generating a UCS that was 6.5–8.4 times better over 28 days and a CBR value that was 61–97 higher. Furthermore, the addition of nano-SiO2 enhanced the engineering properties after adding various SSA/cement ratios, increasing the UCSs that were 30–47 kPa higher over 28 days and generating CBR values that were 3–9 higher. This study suggests that to best develop the additive efficiency, nano-SiO2 should be added to soil treated with an SSA/cement ratio of 3:1. |
| تدمد: | 1866-6299 1866-6280 |
| الوصول الحر: | https://explore.openaire.eu/search/publication?articleId=doi_________::d98eb00856104534c14c4c57ce398fabTest https://doi.org/10.1007/s12665-016-5432-9Test |
| حقوق: | CLOSED |
| رقم الانضمام: | edsair.doi...........d98eb00856104534c14c4c57ce398fab |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 18666299 18666280 |
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