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Article

The Elastic Modulus and Damage Stress–Strain Model of Polypropylene Fiber and Nano Clay Modified Lime Treated Soil under Axial Load

School of Civil Engineering, Shaoxing University, Shaoxing 312000, China
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Author to whom correspondence should be addressed.
Academic Editors: Wensheng Wang, Yongchun Cheng, Heping (Fred) Chen and Guojin Tan
Polymers 2022, 14(13), 2606; https://doi.org/10.3390/polym14132606
Received: 9 June 2022 / Revised: 22 June 2022 / Accepted: 23 June 2022 / Published: 27 June 2022
Using polypropylene fiber (PPF) and nano clay modified lime treated soil (LS), the static and dynamic properties of fiber modified lime treated soil (FLS), nano clay modified lime treated soil (NLS), and fiber nano clay composite modified lime treated soil (NFLS) were studied. Through the unconfined compressive strength (UCS) test and dynamic triaxial test of FLS, NLS, and NFLS, the static and dynamic elastic modulus characteristics at 7 day curing age were explored, and the damage stress–strain model was established. The results show that: (1) Polypropylene fiber and nano clay can significantly enhance the mechanical properties of NFLS. Nano clay can promote the reaction between lime and soil to produce calcium silicate hydrate (C-S-H) and calcium aluminate hydrate (C-A-H), thus improving the strength of NFLS, and UCS can be increased by up to 103%. Polypropylene fiber can enhance the ductility of NFLS and increase the residual ductility strength, and the residual strength can be increased by 827%. (2) Nano clay can enhance the static and dynamic elastic modulus of modified lime treated soil. The static and dynamic elastic modulus of NLS, FLS, and NFLS are linear with the change of polypropylene fiber and nano clay content. The static and dynamic elastic modulus of NLS, FLS, and NFLS are linear, exponential, and logarithmic, respectively. (3) The mesoscopic random damage model can characterize the stress–strain relationship of NFLS. Polypropylene fiber and nano clay can improve the ductility and strength of modified LS, and the composite addition of polypropylene fiber and nano clay can improve the ability of modified LS to resist damage. View Full-Text
Keywords: lime treated soil; polypropylene fiber; nano clay; mechanical properties; damage model lime treated soil; polypropylene fiber; nano clay; mechanical properties; damage model
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MDPI and ACS Style

Wang, Z.; Zhang, W.; Jiang, P.; Li, C. The Elastic Modulus and Damage Stress–Strain Model of Polypropylene Fiber and Nano Clay Modified Lime Treated Soil under Axial Load. Polymers 2022, 14, 2606. https://doi.org/10.3390/polym14132606

AMA Style

Wang Z, Zhang W, Jiang P, Li C. The Elastic Modulus and Damage Stress–Strain Model of Polypropylene Fiber and Nano Clay Modified Lime Treated Soil under Axial Load. Polymers. 2022; 14(13):2606. https://doi.org/10.3390/polym14132606

Chicago/Turabian Style

Wang, Zhichao, Weiqing Zhang, Ping Jiang, and Cuihong Li. 2022. "The Elastic Modulus and Damage Stress–Strain Model of Polypropylene Fiber and Nano Clay Modified Lime Treated Soil under Axial Load" Polymers 14, no. 13: 2606. https://doi.org/10.3390/polym14132606

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