Performance of silane -based surface treatments for protecting degraded historic concrete

Shen, Ling; Jiang, Hui; Wang, Tao; Chen, Kaihao; Zhang, Hui

doi:10.1016/j.porgcoat.2019.01.016

Cited by 57 publications

(18 citation statements)

References 26 publications

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“…Organic products (excluding bio-based) used for concrete repair and protection are polymeric materials based on polyurethanes [52], epoxy resins [53], acrylics [54], acrylamides [55], silanes, siloxanes [56] and other polymers. Generally speaking, these materials possess very good sealing characteristics, but their durability is not optimal because of their incompatibility with the inorganic substrate, which leads to subpar adhesion at sealant-substrate interface and subsequent detachment.…”

Section: Different Approaches To (Self-)healing and Repair With Focus On Bacteria-based Solutionsmentioning

confidence: 99%

Comparison of Microbially Induced Healing Solutions for Crack Repairs of Cement-Based Infrastructure

et al. 2021

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Reinforced concrete crack repair and maintenance costs are around 84% to 125% higher than construction costs, which emphasises the need to increase the infrastructure service life. Prolongation of the designed service life of concrete structures can have significant economic and ecological benefits by minimising the maintenance actions and related increase of carbon and energy expenditure, making it more sustainable. Different mechanisms such as diffusion, permeation and capillary action are responsible for the transport of fluids inside the concrete, which can impact on the structure service life. This paper presents data on microbially induced repair and self-healing solutions for cementitious materials available in the contemporary literature and compares results of compressive strength test and capillary water absorption test, which are relevant to their sealing and mechanical characteristics. The results of the repair and self-healing solutions (relative to unassisted recovery processes) were “normalized.” Externally applied bacteria-based solutions can improve the compressive strength of cementitious materials from 13% to 27%. The internal solution based solely on bacterial suspension had 19% improvement efficacy. Results also show that “hybrid” solutions, based on both bio-based and non-bio-based components, whether externally or internally applied, have the potential for best repair results, synergistically combining their benefits.

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Section: Different Approaches To (Self-)healing and Repair With Focus On Bacteria-based Solutionsmentioning

confidence: 99%

Comparison of Microbially Induced Healing Solutions for Crack Repairs of Cement-Based Infrastructure

et al. 2021

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“…On the basis of not changing the concrete base material, the current method to prevent moisture from invading the concrete interior is to carry out waterproofing treatment on the concrete surface [11][12][13]. Among many waterproof materials, compared to traditional asphalt, such as epoxy resin, polyurethane, and acrylic resin, silane material can penetrate into the concrete interior and will not block the pores of the concrete, which has the effect of gas permeability and impermeability [14][15][16]. Concrete with air permeability can make the water inside the concrete in the process of evaporation be smoothly discharged, reducing the risk of concrete cracking [16].…”

Section: Introductionmentioning

confidence: 99%

Preparation of Modified Silane Composite Emulsion and Its Effect on Surface Properties of Cement-Based Materials

Geng

et al. 2021

Coatings

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A new type of waterproofing composite emulsion with high silane content and good economic efficiency was synthesized by sol synthesis. The effects of the amount and proportion of the compound emulsifier, amount of tetraethyl orthosilicate, and mixing time on the properties of the emulsifier were investigated. The optimum conditions for the synthesis of a tetraethyl orthosilicate/isobutyl triethoxysilane emulsion were determined. The composite emulsion was characterized by infrared spectroscopy, thermogravimetric analysis, scanning electron microscopy, and energy-dispersive spectrometry, along with a series of microscopic testing techniques. It was verified that the composite emulsion was coated on the surface of the paste to form a hydrophobic protective layer. The results show that the composite emulsion can achieve a permeability and impervious effect after coating the concrete material, and microhardness tests prove that the composite emulsion will not reduce the surface hardness of cement-based materials.

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“…The impregnating agents (water repellents, hydrophobic agents) such as silane are a kind of very effective material to protect concrete from water penetration [9]. Silane can penetrate into concrete for a certain depth and interact with hydrated cement particles to form a water repellent layer which can repel water without sealing the pores of the concrete [10][11][12]. Thus, impregnating agents have almost the same service life as normal concrete.…”

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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Performance of silane -based surface treatments for protecting degraded historic concrete

Cited by 57 publications

References 26 publications

Comparison of Microbially Induced Healing Solutions for Crack Repairs of Cement-Based Infrastructure

Comparison of Microbially Induced Healing Solutions for Crack Repairs of Cement-Based Infrastructure

Preparation of Modified Silane Composite Emulsion and Its Effect on Surface Properties of Cement-Based Materials

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

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