Static response of double shell concrete lining with a spray-applied waterproofing membrane

Vogel, Filip; Sovják, Radoslav; Pešková, Šárka

doi:10.1016/j.tust.2017.05.022

Cited by 31 publications

(12 citation statements)

References 7 publications

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“…For the beam tested without axial force, although the longitudinal strains and midspan deflections did not match theoretical values derived for a fully-composite beam, the authors nevertheless concluded that the beams were indeed fully composite and that instead there was a problem with the strain measurement. In fact, composite SCL beams are only partially composite structurally [18,58] and are expected to exhibit larger deflections under the same loading and a different distribution of strain in the cross-section [18] compared to pure sprayed concrete or 'fully composite' beams.…”

Section: Wet Dry Partially Saturated)mentioning

confidence: 99%

Simulating composite behaviour in SCL tunnels with sprayed waterproofing membrane interface: A state-of-the-art review

Su¹,

Bloodworth

2019

Engineering Structures

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Section: Wet Dry Partially Saturated)mentioning

confidence: 99%

Simulating composite behaviour in SCL tunnels with sprayed waterproofing membrane interface: A state-of-the-art review

Su¹,

Bloodworth

2019

Engineering Structures

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“…The hydrophobicity of cement-based materials is predominantly improved by surface hydrophobic modification and internal hydrophobic modification [ 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 ]. Generally, surface hydrophobic modification involves the surface treatment of cement-based materials, such as coating, dipping and spraying.…”

Section: Introductionmentioning

confidence: 99%

“…Previously, a hydrophobic release agent with SiO 2 -CH 3 submicron-sized particles has been developed [ 12 ]; this agent increases the apparent contact angle of the cement mortar surface to higher than 145°, which can improve the hydrophobicity of cement mortar without reducing its compressive strength. Super-hydrophobic concrete has been developed by spraying ethylene–vinyl acetate copolymer to improve its structural property [ 16 ]. A silica-based hybrid nanocomposite, SiO 2 /polymethylhydrosiloxane (SiO 2 /PMHS), has been used for the surface treatment of cement-based materials, which can reduce their water absorption and air permeability [ 17 ].…”

Section: Introductionmentioning

confidence: 99%

Hydrophobicity Improvement of Cement-Based Materials Incorporated with Ionic Paraffin Emulsions (IPEs)

et al. 2020

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Cement-based materials are non-uniform porous materials that are easily permeated by harmful substances, thereby deteriorating their structural durability. In this work, three ionic paraffin emulsions (IPEs) (i.e., anionic paraffin emulsion (APE), cationic paraffin emulsion (CPE), and non-ionic paraffin emulsion (NPE), respectively) were prepared. The effects of incorporation of IPEs into cement-based materials on hydrophobicity improvement were investigated by environmental scanning electron microscopy (ESEM), Fourier transform infrared (FTIR) spectroscopy, transmission and reflection polarizing microscope (TRPM) tests and correlation analyses, as well as by compressive strength, impermeability, and apparent contact angle tests. Finally, the optimal type and the recommended dose of IPEs were suggested. Results reveal that the impermeability pressure and apparent contact angle value of cement-based materials incorporated with IPEs are significantly higher than those of the control group. Thus, the hydrophobicity of cement-based materials is significantly improved. However, IPEs adversely affect the compressive strength of cement-based materials. The apparent contact angle mainly affects impermeability. These three IPEs impart hydrophobicity to cement-based materials. In addition, the optimal NPE dose can significantly improve the hydrophobicity of cement-based materials.

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“…It is well known that water is one of the most aggressive external atmospheric agent that penetrates into mortar structure causing an important physical and chemical degradation that compromises its functionality [4][5][6][7]. In this way, materials such as superplasticizers [8], hydrophobic organic-inorganic materials and membranes based on EVA-copolymer [9] have been used to increase the mortar waterproofness and to enhance the infrastructure service life [10,11]. These materials have been applied by different procedures: impregnation, immersion, additives and release agents.…”

Section: Introductionmentioning

confidence: 99%

A hydrophobic release agent containing SiO2-CH3 submicron-sized particles for waterproofing mortar structures

Izarra

Cubillo

Serrano

et al. 2019

Construction and Building Materials

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Hydrophobic release agents were developed from SiO2-CH3 submicron-sized particles containing hydrophilic and hydrophobic functional groups dispersed into a vegetable oil as support. The SiO2-CH3 submicron-sized particles were synthesized by changing the molar ratio between the precursors Tetraethyl orthosilicate (TEOS) and Methyltriethoxysilane (MTES) from 0.66 to 5 (MTEOS-0.66 to MTEOS-5), being the relative amount of SiO2-CH3 quantified by FTIR technique. Mortar specimens having hydrophobic properties were manufactured using 3 wt.% of the above SiO2-CH3 submicron-sized particles. Additionally, the concentration effect was studied by using MTEOS-0.66 within 3-10wt.%. The hydrophobic properties of the mortar specimens were checked by measuring the contact angle within water droplets and surface. The particle size increased with the MTES/TEOS molar ratio and according to the hydrophobic properties, the proper release agent must be synthesized by using MTEOS-2.5 dispersed into the vegetable oil and having a concentration of 3wt.%. This hydrophobic release agent led mortar surfaces with contact angles higher than 145º. Waterproofing and mechanical studies on concrete specimens allowed to conclude that this demoulding agent do not have a high 2 penetration depth but improved the concrete waterproofing properties, without depletion in the compressive strength.

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Static response of double shell concrete lining with a spray-applied waterproofing membrane

Cited by 31 publications

References 7 publications

Simulating composite behaviour in SCL tunnels with sprayed waterproofing membrane interface: A state-of-the-art review

Simulating composite behaviour in SCL tunnels with sprayed waterproofing membrane interface: A state-of-the-art review

Hydrophobicity Improvement of Cement-Based Materials Incorporated with Ionic Paraffin Emulsions (IPEs)

A hydrophobic release agent containing SiO2-CH3 submicron-sized particles for waterproofing mortar structures

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