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Compaction and Consolidation of Untreated and Coal Waste Ash-Treated Gas Oil-Contaminated Clay as Subgrade Layer
In terms of densification through compaction, the presence of high plasticity clay (HPC) soil causes difficulties for road builders due to unstable structures when contacted with the moisture and after drying. Likewise, extreme volume change of such soil from seasonal moisture variations causes distress in pavement which has been constructed on it. As an external factor, unintentional leakage of petroleum-derived substances during exploration, extraction, transportation, and processing alters the maximum dry density and optimum moisture content of HPC which subsequently makes the compaction properties more challenging. Moreover, the consolidation settlement of such soil will be changed by contamination. This paper presents the results of an experimental study on the effects of gas oil spill on the compaction and consolidation characteristics of HPC. In this study, by spraying on the layered HPC, the artificial contamination with 3%, 5%, 7%, 9%, and 11% gas oil (by weight of dry HPC) and three contamination durations (7, 14, and 28 days) is simulated in the lab. So far, cement or/and lime are known as traditional and popular additives for soil treatment. For the first time, coal waste ash (CWA) is used as a stabilizing agent in gas oil-contaminated HPC, in this study. Consuming CWA instead of cement and lime prevents misuse of natural resources and environmental hazards. Several standard compaction and one-dimensional consolidation (Oedometer) tests were conducted. Based on the results, the compaction behavior of gas oil-contaminated HPC showed remarkable sensitivity to the moisture variations. Moreover, gas oil-contaminated HPC showed higher compression index, swelling index, and pre-consolidation stress with a lower coefficient of consolidation than clean HPC. Chemical treatment by CWA led to a reduction in long-term settlement and swelling. Moreover, the pre-consolidation stress and coefficient of consolidation of contaminated HPC increased and decreased by CWA treatment, respectively.
Compaction and Consolidation of Untreated and Coal Waste Ash-Treated Gas Oil-Contaminated Clay as Subgrade Layer
In terms of densification through compaction, the presence of high plasticity clay (HPC) soil causes difficulties for road builders due to unstable structures when contacted with the moisture and after drying. Likewise, extreme volume change of such soil from seasonal moisture variations causes distress in pavement which has been constructed on it. As an external factor, unintentional leakage of petroleum-derived substances during exploration, extraction, transportation, and processing alters the maximum dry density and optimum moisture content of HPC which subsequently makes the compaction properties more challenging. Moreover, the consolidation settlement of such soil will be changed by contamination. This paper presents the results of an experimental study on the effects of gas oil spill on the compaction and consolidation characteristics of HPC. In this study, by spraying on the layered HPC, the artificial contamination with 3%, 5%, 7%, 9%, and 11% gas oil (by weight of dry HPC) and three contamination durations (7, 14, and 28 days) is simulated in the lab. So far, cement or/and lime are known as traditional and popular additives for soil treatment. For the first time, coal waste ash (CWA) is used as a stabilizing agent in gas oil-contaminated HPC, in this study. Consuming CWA instead of cement and lime prevents misuse of natural resources and environmental hazards. Several standard compaction and one-dimensional consolidation (Oedometer) tests were conducted. Based on the results, the compaction behavior of gas oil-contaminated HPC showed remarkable sensitivity to the moisture variations. Moreover, gas oil-contaminated HPC showed higher compression index, swelling index, and pre-consolidation stress with a lower coefficient of consolidation than clean HPC. Chemical treatment by CWA led to a reduction in long-term settlement and swelling. Moreover, the pre-consolidation stress and coefficient of consolidation of contaminated HPC increased and decreased by CWA treatment, respectively.
Compaction and Consolidation of Untreated and Coal Waste Ash-Treated Gas Oil-Contaminated Clay as Subgrade Layer
Int. J. Pavement Res. Technol.
Gorji, Jamal (author) / Farrokhzad, Farzad (author) / Mohammadirad, Seyedalireza (author) / Tabari, Mohammadreza Khaleghnejad (author) / Choobbasti, Asskar Janalizadeh (author)
International Journal of Pavement Research and Technology ; 17 ; 653-667
2024-05-01
15 pages
Article (Journal)
Electronic Resource
English
Consolidation Effect and Influencing Factors of Dynamic Compaction for Filling Subgrade
| Tema Archive | 2012