Determining the effective service life of silane treatments in concrete bridge decks

Moradllo, Mehdi Khanzadeh; Sudbrink, Bryan; Ley, M. Tyler

doi:10.1016/j.conbuildmat.2016.04.132

Cited by 53 publications

(11 citation statements)

References 9 publications

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“…[ 20 ] Moradllo found that silane can reduce water entry into concrete and maintain good protection for long service. [ 21 ] Zhang found that silane is the most suitable material from polyuria and epoxy resin to improve FT resistance and its optimum dosage is 4 m 2 kg − 1 . [ 22 ] Guo found that the order of FT protection ability is silane > modified polyuria > AH material > epoxy resin.…”

Section: Introductionmentioning

confidence: 99%

Improvement of Freeze‐Thaw Resistance of Concrete by Polyvinyl Alcohol Membrane and Silane

Kang,

Wu,

et al. 2023

Adv Eng Mater

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The surface protection can improve the waterproofness of concrete, thus reducing the saturation inside and improving the freeze‐thaw resistance (FT). Polyvinyl alcohol (PVA) membranes with different thicknesses and silane with varying impregnation depths are selected to improve the FT resistance of concrete as surface protection. The damage morphology, mass variation, ultrasonic pulse velocity, and mechanical characteristics of concrete after 125 FT times are analyzed according to the slow freezing method, and the damage mechanism is studied by scanning electron microscope in different depths of concrete. The results show that PVA membrane can improve the FT resistance of concrete and do better than silane because the silane can only keep dry inside the concrete but the surface still spalls off. And, the protection effect of PVA is a negative correlation with membrane thickness because the thicker the PVA membrane the better the air tightness and the membrane is easier damaged. On a microscopic level, the damage of PVA‐protected concrete is gradually weakened from the surface of concrete to inside, and there is an obvious boundary between the damaged and undamaged zone of silane‐protected concrete. This article provides a new idea for FT protection of concrete.

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Section: Introductionmentioning

confidence: 99%

Improvement of Freeze‐Thaw Resistance of Concrete by Polyvinyl Alcohol Membrane and Silane

Kang,

Wu,

et al. 2023

Adv Eng Mater

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“…Maravelaki-Kalaitzaki (2007) and Moradllo et al (2008) [11,12] mentioned the technique of applying a penetrating water repellent to the surface without using a separate protective layer such as a urethane waterproofing or waterproofing sheet to increase the durability of concrete for the prevention of moisture-induced deterioration. Currently, the most effective technique to prevent water absorption is sealing the exposed concrete surface with a coating film, such as a rubber asphalt surface treatment.…”

Section: Introductionmentioning

confidence: 99%

Properties and Durability of Cement Mortar Using Calcium Stearate and Natural Pozzolan for Concrete Surface Treatment

Park

Yoon

2022

Materials

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Applying a concrete surface treatment method (epoxy or primer) can prevent water from penetrating concrete through surface pores. However, if the concrete surface is damaged, the subsequent reconstruction can be expensive and time-consuming. Concrete that is resistant to internal and external water has been extensively developed and used to supplement the surface treatment method. Herein, we prepared specimens by mixing cement mortar with fatty-acid-salt-based calcium stearate attached to two natural pozzolanic materials—diatomite and yellow clay. The physical tests measured (1) the air content, (2) flow test, (3) compressive strength, and (4) activity Factor. Durability experiments were performed on (1) the contact angle, (2) chloride ion diffusion coefficient, and (3) water absorption test. The results revealed that the compressive strength of concrete decreased as the calcium stearate content increased. Furthermore, it was confirmed that the contact angle of the test piece using the pozzolanic substance and calcium stearate was twice as high. It was confirmed that the sand test specimen had the highest water absorption rate, and the DT3% had the lowest. (Sand%: 11.8 > OPC: 6.5 > DT3%: 2.4), the chloride diffusion coefficient also showed similar results. (Sand%: 12.5 > OPC: 8.4 > DT1%: 8.8)Due to its unique insolubility, calcium stearate retards hydrate formation when mixed alone and negates compressive strength loss when combined with pozzolanic mixtures rich in SiO2 and Al2O3. Furthermore, the ideal method for producing water-resistant cement mortar is to evenly disperse calcium stearate in the porous powder of cement mortar.

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“…Recently, the effect of silane-based impregnating agent treatments on concrete surfaces has been evaluated by testing water absorption [13][14][15], chloride ion diffusion [16][17][18], carbonation depth [19,20], of the concrete used in this study is shown in Table 1. Natural sand with a 2 mm maximum size and gravel with a 25 mm maximum size were used as fine and coarse aggregates, respectively.…”

Section: Introductionmentioning

confidence: 99%

Effect of SiO2 Sol/Silane Emulsion in Reducing Water and Chloride Ion Penetration in Concrete

Geng

Hou

et al. 2020

Coatings

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Here, a new concrete hydrophobic treatment method is developed using SiO2 sol and silane emulsion. The effectiveness of the modification for concrete protection is evaluated through testing water absorption and chloride diffusion. Two types of concrete with different strength grades (C40, C50) are used as the research object. The results show that the water capillary absorption coefficient and chloride ion diffusion coefficient of concrete decrease greatly under the protection of SiO2 sol and silane emulsion. Additionally, the protection effect is better with the increase of SiO2 consumption. Contact angle test results reveal that when the coating amount of SiO2 sol and silane emulsion is 300 g/m2, respectively, the contact angle reaches 150.2°, indicating the concrete (C40) surface reaches the superhydrophobic state. Through scanning electron microscope (SEM) observation, it is found that the hydrophobic effect of the SiO2 sol/silane emulsion is mainly due to the change in the surface morphology of concrete (C40).

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Determining the effective service life of silane treatments in concrete bridge decks

Cited by 53 publications

References 9 publications

Improvement of Freeze‐Thaw Resistance of Concrete by Polyvinyl Alcohol Membrane and Silane

Improvement of Freeze‐Thaw Resistance of Concrete by Polyvinyl Alcohol Membrane and Silane

Properties and Durability of Cement Mortar Using Calcium Stearate and Natural Pozzolan for Concrete Surface Treatment

Effect of SiO2 Sol/Silane Emulsion in Reducing Water and Chloride Ion Penetration in Concrete

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