Improvement of the Serviceability of Damaged Concrete and Reinforced-Concrete Structures by Sealing Hardening Injections

Marukha, V. I.

doi:10.1007/s11003-013-9577-3

Cited by 4 publications

(2 citation statements)

References 4 publications

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“…It is also clear that the healing efficiency will depend on the adhesion of the healing agent onto the crack faces and the nature of this adhesion depends on the bonds formed at the interface. Although it is stated by Marukha, that foaming polyurethanes form much weaker adhesive bonds with the cementitious matrix compared to unfoamable polyurethanes, the rapid reaction and the fact that the reaction of foamable polyurethanes can occur in the presence of water are important advantages for this study. More details with regard to the mechanical properties, curing kinetics, and adhesive properties of the polyurethane‐based healing agent can be found in previous publications .…”

Section: Methodsmentioning

confidence: 99%

X‐ray Radiography to Visualize the Rebar–Cementitious Matrix Interface and Judge the Delay in Corrosion through Self‐Repair by Encapsulated Polyurethane

Tittelboom

Belleghem

Boone

et al. 2017

Adv Materials Inter

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very interesting as cracking of concrete is inevitable due to its rather low tensile strength. These cracks can lead to higher water ingress and easier gas and aggressive ion penetration compared to an uncracked state, resulting in an increased risk for carbonation-and chloride-induced reinforcement corrosion. It was stated by Vaysburd and Emmons [6] that the coefficient of carbon dioxide ingress was three orders of magnitude higher for samples with a crack of 200 µm compared to uncracked concrete. When analyzing the effect of cracks on chloride ingress, Ismail et al. [7] noted that for crack widths between 80 and 100 µm the penetration orthogonal to the crack remained two times smaller than the penetration from the surface. However, for crack widths larger than 200 µm the chloride concentration profile became identical to the one measured from the surface. In addition, Montes et al. [8] noticed that the corrosion rate for cracked concrete was up to ten times higher than for uncracked concrete with crack widths of 250 and 500 µm.Autogenous healing of concrete cracks can result in a reduction of the chloride ingress as was noticed by Zhywen et al. [9] However, the autogenous healing efficiency depends on the composition of the concrete mix, the age at crack formation, the crack shape, etc. V-shaped cracks can easily be healed when the crack width remains limited. Zhywen et al. [9] found that for V-shaped cracks there is a critical crack width of around 70 µm, below which no ingress of chloride ions is noticed, while this was not the case for parallel cracks. They attributed this to the fact that parallel shaped cracks do almost not show autogenous healing. In order to improve the protection of the rebars through autogenous healing, Pei et al. [10] applied a cementitious coating onto the rebar surface. Unlike epoxy coatings, frequently applied on steel rebars and causing local pitting when a defect appears in the coating, this cementitious capillary crystalline waterproofing (CCCW) material is advantageous because of its demonstrated self-healing capabilities. In the presence of moisture, the coating material is able to undergo a continuous hydration reaction and to propagate into the concrete matrix. In this way, problems related to improper application and damage of the coating during construction can be circumvented.Corrosion of steel reinforcement is one of the most detrimental attack mechanisms for reinforced concrete structures. The presence of cracks, which are inextricably linked to reinforced concrete, accelerates this attack mechanism. The aim of this study is to heal cracks by an autonomous mechanism, which is triggered upon crack appearance. With an accelerated corrosion test on mortar samples with embedded reinforcement bars, it is shown that the presence of cracks indeed accelerates the onset and propagation of corrosion at the interface between the rebar and the cementitious matrix. Moreover, it is shown that crack healing in both the traditional, manual way and the proposed autonomous way, with an e...

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Section: Methodsmentioning

confidence: 99%

X‐ray Radiography to Visualize the Rebar–Cementitious Matrix Interface and Judge the Delay in Corrosion through Self‐Repair by Encapsulated Polyurethane

Tittelboom

Belleghem

Boone

et al. 2017

Adv Materials Inter

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“…Тому необхідно вжити заходів до поліпшення сприйняття ним навантажень інших видів.Український журнал будівництва та архітектури, № 2 (020), 2024 р.,ISSN 2710-0367 (print), ISSN 2710 споруд ситуація загострюється через їх розтріскування внаслідок корозії сталевої арматури, через що збільшується сумарний об'єм металу і продуктів корозії, а, отже, виникають розтягувальні напруження у бетонних матрицях. Утворення в бетоні тріщиноподібних дефектів -основна загроза міцності та довговічності таких конструкцій, тому, «заліковуючи» (усуваючи) їх, можна поліпшити ці характеристики[6].Деякі з конструкцій піддаються впливу особливих умов. Наприклад, напівзмінного зволоження та висушування, заморожування та відтавання, постійної дії вологи, навантаження різного виду та їх поєднання тощо.…”

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Basic Principles of Construction and Repair of Civil Buildings Using Bim-Technologies

Harkusha,

Simonov

2024

УЖБА

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Problem statement. The peculiarities of the construction of civilian buildings consist in ensuring a reduction in energy consumption, costs for their maintenance and a harmonious combination with the urban environment; the cost reduction of buildings that are rented out; reducing the duration of civil buildings construction. In the process of building civil buildings, a large number of uncoordinated operations may occur, which lead to a decrease in the quality of the finished housing and material losses. Thanks to the use of BIM-technologies, it is possible to maximally take into account such inconsistent moments and make the construction process more efficient. Purpose of the article is to analyse the practical experience of BIM-technologies using for the construction and repair of civil buildings, including the use of concrete with polymer addmitures as a material for the repair of civil buildings from the point of view of increasing their service life. Conclusion. Today, the sphere of construction production is changing quite dynamically. More recently, there were no materials that would allow to achieve qualitatively different results. These are primarily polymer additives for concrete, which are currently available in large quantities. However, the use of polymer additives requires a full knowledge of their properties. This is necessary for the reason that such components, in case of non-compliance with the rules of their use, can nullify the efforts of all project participants. If you have a sufficient level of knowledge about the components used by this or that production, there are situations when weather conditions can radically change the result of construction work, but not always in a more favorable direction. It is important to take into account not only information about the interaction of many factors, but also the need to build a civil building that meets the thermal and technical characteristics of modern construction. Not only the profit from the planned project depends on this, but also the living conditions and comfort of many generations of the population of our country.

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Corrosion protection of reinforcement with phosphate coatings

Konovalova

Rumyantseva

2020

IOP Conf. Ser.: Mater. Sci. Eng.

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As a method of protection against corrosion, the application of phosphate coatings to the surface of steel reinforcement before the manufacture of a reinforced concrete product can be considered. The influence of modifiers introduced into the cold phosphating solution on the structure and protective properties of phosphate coatings was studied. It is established that from solutions with the addition of saccharin, glucose, Trilon A, Trilon B and washing preparations, fine crystalline, dense phosphate films are obtained. The introduction of the proposed additives also reduces the time of formation of a phosphate coating on the surface of the steel and leads to a decrease in their porosity. It has been established that phosphate coatings are resistant to the effects of aqueous, salt and acidic environments. Films deposited from modified cold phosphating solutions provide better corrosion protection compared to films obtained from a traditional cold phosphating solution. Presented phosphate coatings have high protective properties, because, due to their lower porosity, they well prevent the penetration of aggressive particles to the surface of the protected reinforcement.

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Improvement of the Serviceability of Damaged Concrete and Reinforced-Concrete Structures by Sealing Hardening Injections

Cited by 4 publications

References 4 publications

X‐ray Radiography to Visualize the Rebar–Cementitious Matrix Interface and Judge the Delay in Corrosion through Self‐Repair by Encapsulated Polyurethane

X‐ray Radiography to Visualize the Rebar–Cementitious Matrix Interface and Judge the Delay in Corrosion through Self‐Repair by Encapsulated Polyurethane

Basic Principles of Construction and Repair of Civil Buildings Using Bim-Technologies

Corrosion protection of reinforcement with phosphate coatings

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