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Effect of compaction delay on the strength and consolidation properties of cement-stabilized subgrade soil
Transportation Geotechnics ( IF 4.9 ) Pub Date : 2020-12-15 , DOI: 10.1016/j.trgeo.2020.100495
Zeynab Nazari , Alireza Tabarsa , Nima Latifi

Soil compaction is a considerable construction activity to ensure safety and durability, notably in the transportation industry. Compaction delay (CD) occurs because of unpredictable cases which may be related to the climatic, environmental, and logistics reasons. Since the time delay in compaction process affects the engineering properties of the materials in road construction, the current study evaluates the effect of CD on mechanical and consolidation characteristics of cement-stabilized subgrade soil. To achieve this purpose, a set of experimental tests including standard compaction, unconfined compressive strength (UCS), and one-dimensional consolidation tests are performed. Samples are mixed with 1.5, 3, 6, and 9% Portland cement on their maximum dry density (MDD) considering different ranges of CD up to 120 min. Delayed samples show a reduction in MDD (3.46–5.43%), and UCS (11.31–37.25%) compared with those of non-delayed ones. Morphological findings from scanning electron microscope (SEM) analysis confirmed that the CD has a destructive effect on the mechanical characteristics of the soil–cement samples even in the long run. Correspondingly, delayed samples show lower secant modulus (1.81 times) rather than immediate compacted ones. Furthermore, higher CD yields mixtures with higher compression index and void ratio. Finally, laboratory test results are used to develop MDD and UCS regression models considering the CD parameter. The sensitivity analysis, based on regression models, shows that the MDD and UCS are noticeably influenced by cement content variations.



中文翻译:

压实延迟对水泥稳定路基土强度和固结特性的影响

土壤压实是确保安全和耐用的重要建筑活动,特别是在运输行业。压实延迟(CD)的发生是由于不可预测的情况,可能与气候,环境和后勤原因有关。由于压实过程中的时间延迟会影响筑路材料的工程性能,因此本研究评估了CD对水泥稳定路基土的力学和固结特性的影响。为了实现此目的,执行了一组实验测试,包括标准压实,无侧限抗压强度(UCS)和一维固结测试。考虑到120分钟内CD的不同范围,将样品按其最大干密度(MDD)与1.5%,3%,6%和9%的波特兰水泥混合。与非延迟样本相比,延迟样本显示MDD(3.46-5.43%)和UCS(11.31-37.25%)减少。扫描电子显微镜(SEM)分析的形态学结果证实,即使从长远来看,CD对土壤-水泥样品的机械特性也具有破坏作用。相应地,延迟的样本显示较低的割线模量(1.81倍),而不是立即压缩的割线模量。此外,较高的CD产生具有较高压缩指数和空隙率的混合物。最后,考虑CD参数,将实验室测试结果用于开发MDD和UCS回归模型。基于回归模型的敏感性分析表明,MDD和UCS受到水泥含量变化的显着影响。扫描电子显微镜(SEM)分析的形态学结果证实,即使从长远来看,CD对土壤-水泥样品的机械特性也具有破坏作用。相应地,延迟的样本显示较低的割线模量(1.81倍),而不是立即压缩的割线模量。此外,较高的CD产生具有较高压缩指数和空隙率的混合物。最后,考虑CD参数,将实验室测试结果用于开发MDD和UCS回归模型。基于回归模型的敏感性分析表明,MDD和UCS受到水泥含量变化的显着影响。扫描电子显微镜(SEM)分析的形态学结果证实,即使从长远来看,CD对土壤-水泥样品的机械特性也具有破坏作用。相应地,延迟的样本显示较低的割线模量(1.81倍),而不是立即压缩的割线模量。此外,较高的CD产生具有较高压缩指数和空隙率的混合物。最后,考虑CD参数,将实验室测试结果用于开发MDD和UCS回归模型。基于回归模型的敏感性分析表明,MDD和UCS受到水泥含量变化的显着影响。延迟样品显示的割线模量较低(1.81倍),而不是立即压实的。此外,较高的CD产生具有较高压缩指数和空隙率的混合物。最后,考虑CD参数,将实验室测试结果用于开发MDD和UCS回归模型。基于回归模型的敏感性分析表明,MDD和UCS受到水泥含量变化的显着影响。延迟样品显示的割线模量较低(1.81倍),而不是立即压实的。此外,较高的CD产生具有较高压缩指数和空隙率的混合物。最后,考虑CD参数,将实验室测试结果用于开发MDD和UCS回归模型。基于回归模型的敏感性分析表明,MDD和UCS受到水泥含量变化的显着影响。

更新日期:2020-12-22
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