Experimental Evaluation of Aging Characteristics of EPDM as a Sealant for Undersea Shield Tunnels

Wang, Ze-Nian; Shen, Shui‐Long; Zhou, Annan; Xu, Ye‐Shuang

doi:10.1061/(asce)mt.1943-5533.0003242

Cited by 41 publications

(19 citation statements)

References 53 publications

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“…The water swelling polyurethane (WSP) and water swelling rubber (WSR) are two polymer materials that provide water resistance by swelling when they are soaked in water [1] , [2] , [3] – 4] under leaking situation [5] , [6] , [7] – 8] . The WSP material was prepared first by adding TDI, and prepolymer.…”

Section: Experimental Design Materials and Methodsmentioning

confidence: 99%

Experimental data of water swelling characteristics of polymer materials for tunnel sealing gasket

et al. 2020

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This article provides comprehensive experimental data of two polymers for shield tunnel sealing gasket: i) water swelling polyurethane (WSP) and ii) a mixture (WSRP) of WSP and water swelling rubber (WSR). Water-swelling tests are conducted to investigate the microstructural changes and properties of both WSP and WSRP during water swelling. These data can be useful for the quantitative evaluation of water swelling performance of WSP and WSRP. The data presented herein was used for the article, titled “Experimental investigation of water swelling characteristics of polymer materials for tunnel sealing gasket” [1] .

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Section: Experimental Design Materials and Methodsmentioning

confidence: 99%

Experimental data of water swelling characteristics of polymer materials for tunnel sealing gasket

et al. 2020

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“…The components of artificial seawater are prepared based on the References [45,48,49]. Both distilled water and artificial seawater were maintained at a constant temperature of 80 C to accelerate the aging process of EPDM blends.…”

Section: Materials and Sample Preparationmentioning

confidence: 99%

“…Several attempts have been made to investigate the aging proprieties of polymer composites in seawater. Hinkley and Holmes 44 and Wang et al 45 conducted tests on the mechanical propriety of polymer composites in marine conditions. Geethamma and Thomas 46 proposed a probable mechanism of natural rubber/coir fiber composites under the diffusion of water and artificial seawater.…”

Section: Introductionmentioning

confidence: 99%

Mechanical, flame‐retarding, and creep‐recovery proprieties of ethylene–propylene–diene monomer enhanced with nano‐hydroxide for undersea tunnel sealing gasket

Wang

Shen

Zhou³

et al. 2020

J of Applied Polymer Sci

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This study investigates the mechanical, flame-retarding, and creep-recovery proprieties of ethylene-propylene-diene monomer (EPDM) composites. The EPDM composites are filled with different contents of nano-Mg(OH) 2 (NMH) or nano-Al(OH) 3 (NATH). To examine the effect of contents of NMH (or NATH) and seawater immersion, mechanical tests are conducted and the limiting oxygen index (LOI) method was applied. Creep-recovery tests are then conducted to obtain the creep resistance property of EPDM composites with contents of NMH (or NATH). The microstructure of EPDM composites is investigated by using scanning electron microscopy (SEM). The results indicate that NMH (or NATH) can enhance the flame-retarding, creep resistance, and hardness properties, whereas tensile strength and elongation at break increase at first and then decrease with increasing content of NMH (or NATH). The Findley power law and the Weibull distribution function show good correspondence with the results of creep-recovery tests for EPDM composites. Furthermore, SEM results show good interfaces between nanoparticles and the matrix implying the mechanism of the above results.

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“…Till present, a series of empirical and analytical methods for determining appropriate grout parameters have been discussed in the literature 21–30 . One of the limitations of these approaches is that none of them involve the grout diffusion process at tail void during shield tunneling.…”

Section: Introductionmentioning

confidence: 99%

A diffusion model for backfill grout behind shield tunnel lining

Liu

Shen

et al. 2020

Num Anal Meth Geomechanics

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This paper presents an analytical model to investigate backfill grout diffusion behind tunnel segmental lining, in which the backfill grout is taken as a Bingham fluid. The analytical model of grout diffusion is derived based on force–equilibrium principle, Darcy's law, and the law of momentum conservation of the grout. Time‐dependent grout diffusion pressure and distance are highlighted in the model. The proposed grout diffusion model is applied in two field cases: Metro Lines No. 9 and No. 4 in Shanghai City. The results show that the proposed model agrees well with the measured grout diffusion distance in the field. Parametric studies are then conducted, implying that grout diffusion distance along the radial direction of tunnel lining is proportional to either hydraulic conductivity or initial grout pressure, whereas it is in inverse proportion to the yield stress of backfill grout. The distributions of initial grout pressure exert key influences on the grout diffusion distance and grout diffusion pressure behind tunnel segment lining.

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Experimental Evaluation of Aging Characteristics of EPDM as a Sealant for Undersea Shield Tunnels

Cited by 41 publications

References 53 publications

Experimental data of water swelling characteristics of polymer materials for tunnel sealing gasket

Experimental data of water swelling characteristics of polymer materials for tunnel sealing gasket

Mechanical, flame‐retarding, and creep‐recovery proprieties of ethylene–propylene–diene monomer enhanced with nano‐hydroxide for undersea tunnel sealing gasket

A diffusion model for backfill grout behind shield tunnel lining

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