Modification of mechanical properties of Shanghai clayey soil with expanded polystyrene

IF 1.9 4区材料科学 Q3 Materials Science Science and Engineering of Composite Materials Pub Date : 2022-01-01 DOI:10.1515/secm-2022-0004

Qu Jili, Tao Huan, Qu Weiqing, Han Guoqi, Liu Hongmei, Patanmuhan Abulimiti, Semaierjiang Maimaitiyusupu, A. Batugin

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引用次数: 3

Abstract

Abstract In the present study, the resistance characteristics of Shanghai clayey soil-expanded polystyrene (EPS) mixture have been explored, using unconfined compressive and consolidation and rebound tests. EPS beads were mixed homogenously with clay soil in accordance with different mass ratios of beads to soil, that is, 0, 0.02, and 0.03%. Four particle sizes of EPS were used in the mixtures, that is, 0.5, 1, 3, and 7 mm, to reconstruct the samples. The experimental results indicated that (1) under the condition of unconfined compressive test, with the increase of EPS particle size, the compressive strength of reinforced soil increases significantly, but the compressive strength of reinforced soil decreases compared with the control sample, and it also decreases with high content compared to low EPS content; (2) under the consolidation and rebound test, compression index and rebound index of reinforced soil increased obviously compared with the control sample, but the compression modulus of reinforced soil decreases significantly; (3) in addition, the ductility of reinforced soil decreases with the increase of EPS particle size but increases compared with the control sample. At the same time, the stiffness of reinforced soil is much decreased compared with the control sample. Finally, the cause of deformation characteristics of reinforced soil was explained based on the feature of EPS material and the interaction between soil particles and particles of EPS beads.

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膨胀聚苯乙烯改性上海黏性土力学性能研究

摘要通过无侧限压缩固结和回弹试验，对上海黏性土-膨胀聚苯乙烯(EPS)混合料的抗压特性进行了研究。将EPS微珠按微珠与土质量比分别为0、0.02、0.03%与粘土混合均匀。在混合物中使用4种粒径的EPS，即0.5、1、3和7 mm，重建样品。试验结果表明:(1)无侧限压缩试验条件下，随着EPS粒径的增大，加筋土抗压强度显著增大，但与对照试样相比，加筋土抗压强度减小，且EPS含量高时加筋土抗压强度也比EPS含量低时降低;(2)固结回弹试验下加筋土的压缩指数和回弹指数较对照试样明显增大，但加筋土的压缩模量明显减小;(3)加筋土的延性随EPS粒径的增大而减小，但与对照试样相比有所增加。与此同时，加筋土的刚度比对照土降低了很多。最后，根据EPS材料的特性以及土体颗粒与EPS珠粒之间的相互作用，解释了加筋土变形特性的原因。

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来源期刊

Science and Engineering of Composite Materials 工程技术-材料科学：复合

CiteScore

3.10

自引率

5.30%

发文量

审稿时长

4 months

期刊介绍： Science and Engineering of Composite Materials is a quarterly publication which provides a forum for discussion of all aspects related to the structure and performance under simulated and actual service conditions of composites. The publication covers a variety of subjects, such as macro and micro and nano structure of materials, their mechanics and nanomechanics, the interphase, physical and chemical aging, fatigue, environmental interactions, and process modeling. The interdisciplinary character of the subject as well as the possible development and use of composites for novel and specific applications receives special attention.