Experimental Research on Deformation Characteristics of Using Silty Clay Modified by Oil Shale Ash and Fly Ash as the Subgrade Material after Freeze-Thaw Cycles

To achieve the purposes of disposing industry solid wastes and enhancing the sustainability of subgrade life-cycle service performance in seasonally frozen regions compared to previous research of modified silty clay (MSC) composed of oil shale ash (OSA), fly ash (FA), and silty clay (SC), we identi...

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Main Authors: Haibin Wei, Qinglin Li, Leilei Han, Shuanye Han, Fuyu Wang, Yangpeng Zhang, Zhao Chen
Format: Article
Language:English
Published: MDPI AG 2019-09-01
Series:Sustainability
Subjects:
Online Access:https://www.mdpi.com/2071-1050/11/18/5141
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spelling doaj-400d7c8b501f4de0a35c429ba88265de2020-11-24T20:53:44ZengMDPI AGSustainability2071-10502019-09-011118514110.3390/su11185141su11185141Experimental Research on Deformation Characteristics of Using Silty Clay Modified by Oil Shale Ash and Fly Ash as the Subgrade Material after Freeze-Thaw CyclesHaibin Wei0Qinglin Li1Leilei Han2Shuanye Han3Fuyu Wang4Yangpeng Zhang5Zhao Chen6School of Transportation, Jilin University, Changchun 130022, ChinaSchool of Transportation, Jilin University, Changchun 130022, ChinaSchool of Transportation, Jilin University, Changchun 130022, ChinaSchool of Transportation, Jilin University, Changchun 130022, ChinaSchool of Transportation, Jilin University, Changchun 130022, ChinaGuangxi Transportation Research & Consulting Co., LTD, Guangxi Key Lab of Road Structure and Materials, High-Grade Highway Construction & Maintenance Technology, Materials and Equipment Transportation Industry R&D Center (Nanning), Nanning 530000, ChinaJilin Province Highway Group Co., LTD, Changchun 130025, ChinaTo achieve the purposes of disposing industry solid wastes and enhancing the sustainability of subgrade life-cycle service performance in seasonally frozen regions compared to previous research of modified silty clay (MSC) composed of oil shale ash (OSA), fly ash (FA), and silty clay (SC), we identified for the first time the axial deformation characteristics of MSC with different levels of cycle load number, dynamic stress ratio, confining pressure, loading frequency, and F-T cycles; and corresponding to the above conditions, the normalized and logarithmic models on the plastic cumulative strain prediction of MSC are established. For the effect of cycle load number, results show that the cumulative plastic strain of MSC after 1, 10, and 100 cycle loads occupies for 28.72%~35.31%, 49.86%~55.59%, and 70.87%~78.39% of those after 8000 cycle loads, indicating that MSC possesses remarkable plastic stability after 100 cycles of cycle loads. For the effect of dynamic stress ratio, confining pressure, loading frequency, and F-T cycles, results show that dynamic stress ratio and F-T cycles are important factors affecting the axial deformation of MSC after repeated cycle loads; and under the low dynamic stress ratio, increasing confining pressure and loading frequency have insignificant effect on the axial strain of MSC after 8000 loads. In term of the normalized and logarithmic models on the plastic cumulative strain prediction of MSC, they have a high correlation coefficient with testing data, and according to the above models, the predicted result shows that the cumulative plastic strain of MSC ranges from 0.38 cm to 2.71 cm, and these predicted values are within the requirements in the related standards of highway subgrades and railway, indicating that the cumulative plastic strain of MSC is small and MSC is suitable to be used as the subgrade materials.https://www.mdpi.com/2071-1050/11/18/5141modified silty clayoil shale ashfly ashcumulative plastic strainnormalized and logarithmic modelsfreeze-thaw cycles
collection DOAJ
language English
format Article
sources DOAJ
author Haibin Wei
Qinglin Li
Leilei Han
Shuanye Han
Fuyu Wang
Yangpeng Zhang
Zhao Chen
spellingShingle Haibin Wei
Qinglin Li
Leilei Han
Shuanye Han
Fuyu Wang
Yangpeng Zhang
Zhao Chen
Experimental Research on Deformation Characteristics of Using Silty Clay Modified by Oil Shale Ash and Fly Ash as the Subgrade Material after Freeze-Thaw Cycles
Sustainability
modified silty clay
oil shale ash
fly ash
cumulative plastic strain
normalized and logarithmic models
freeze-thaw cycles
author_facet Haibin Wei
Qinglin Li
Leilei Han
Shuanye Han
Fuyu Wang
Yangpeng Zhang
Zhao Chen
author_sort Haibin Wei
title Experimental Research on Deformation Characteristics of Using Silty Clay Modified by Oil Shale Ash and Fly Ash as the Subgrade Material after Freeze-Thaw Cycles
title_short Experimental Research on Deformation Characteristics of Using Silty Clay Modified by Oil Shale Ash and Fly Ash as the Subgrade Material after Freeze-Thaw Cycles
title_full Experimental Research on Deformation Characteristics of Using Silty Clay Modified by Oil Shale Ash and Fly Ash as the Subgrade Material after Freeze-Thaw Cycles
title_fullStr Experimental Research on Deformation Characteristics of Using Silty Clay Modified by Oil Shale Ash and Fly Ash as the Subgrade Material after Freeze-Thaw Cycles
title_full_unstemmed Experimental Research on Deformation Characteristics of Using Silty Clay Modified by Oil Shale Ash and Fly Ash as the Subgrade Material after Freeze-Thaw Cycles
title_sort experimental research on deformation characteristics of using silty clay modified by oil shale ash and fly ash as the subgrade material after freeze-thaw cycles
publisher MDPI AG
series Sustainability
issn 2071-1050
publishDate 2019-09-01
description To achieve the purposes of disposing industry solid wastes and enhancing the sustainability of subgrade life-cycle service performance in seasonally frozen regions compared to previous research of modified silty clay (MSC) composed of oil shale ash (OSA), fly ash (FA), and silty clay (SC), we identified for the first time the axial deformation characteristics of MSC with different levels of cycle load number, dynamic stress ratio, confining pressure, loading frequency, and F-T cycles; and corresponding to the above conditions, the normalized and logarithmic models on the plastic cumulative strain prediction of MSC are established. For the effect of cycle load number, results show that the cumulative plastic strain of MSC after 1, 10, and 100 cycle loads occupies for 28.72%~35.31%, 49.86%~55.59%, and 70.87%~78.39% of those after 8000 cycle loads, indicating that MSC possesses remarkable plastic stability after 100 cycles of cycle loads. For the effect of dynamic stress ratio, confining pressure, loading frequency, and F-T cycles, results show that dynamic stress ratio and F-T cycles are important factors affecting the axial deformation of MSC after repeated cycle loads; and under the low dynamic stress ratio, increasing confining pressure and loading frequency have insignificant effect on the axial strain of MSC after 8000 loads. In term of the normalized and logarithmic models on the plastic cumulative strain prediction of MSC, they have a high correlation coefficient with testing data, and according to the above models, the predicted result shows that the cumulative plastic strain of MSC ranges from 0.38 cm to 2.71 cm, and these predicted values are within the requirements in the related standards of highway subgrades and railway, indicating that the cumulative plastic strain of MSC is small and MSC is suitable to be used as the subgrade materials.
topic modified silty clay
oil shale ash
fly ash
cumulative plastic strain
normalized and logarithmic models
freeze-thaw cycles
url https://www.mdpi.com/2071-1050/11/18/5141
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