Flexible Adhesive in Composite-to-Brick Strengthening—Experimental and Numerical Study

Kwiecień, Arkadiusz; Krajewski, Piotr; Hojdys, Łukasz; Tekieli, Marcin; Słoński, Marek

doi:10.3390/polym10040356

Cited by 19 publications

(12 citation statements)

References 41 publications

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“…One of the major cause of deaths in case of an earthquake are failures of buildings and other masonry structures due to their brittle behavior. It was proven that such failures can be successfully avoided or at least delayed in time with different technologies based on polyurethanes (PU) and their fibrous composites [2][3][4][5][6][7]. Polyurethane flexible joints (PUFJ) and fiber reinforced polyurethanes (FRPU) have been introduced in the last decade and investigated in laboratory and in-situ tests concerning their mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

“…PSpolyurethane has been applied as a flexible adhesive layer and matrix of composite fibers in FRPU systems, bonding composite laminates to concrete elements as externally bonded (EB) systems [4,14] and near-surface mounted (NSM) systems [14]. PU flexible adhesives and matrices were also used as FRPU in masonry applications [3,15,16]. However, there have been concerns about the durability of the provided solutions, as they were all tested shortly after implementation.…”

Section: Introductionmentioning

confidence: 99%

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Durability of PS-Polyurethane Dedicated for Composite Strengthening Applications in Masonry and Concrete Structures

Kwiecień

Stryszewska

et al. 2020

Polymers

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Polyurethane flexible joints (PUFJ) and fiber reinforced polyurethanes (FRPU) have shown great potential in the repair and protection of masonry and concrete structures. However, some questions have been raised about the durability of such solutions. The accelerated weathering and thermal stability tests carried out so far have shown the mechanical stability of PS-polyurethane in temperatures up to 100 °C and some UV-induced surface degradation. The paper reports the results from tensile tests of PS-polyurethane, used in the technologies mentioned above after being subjected to aging in different corrosive factors, a thermal analysis of unaged polymer which consists of DSC-TGA and dilatometry studies, and SEM-microscopy observation of the specimens with the indication of the elemental composition (EDS). PS-polyurethane showed low sensitivity to weathering with exposition to UV-radiation, some reactiveness to aqueous environments of a different chemical nature, and resistivity to soil and freezing in both air and water. SEM observations indicated changes in the composition of mineral fillers as the main effect of immersion in different water solutions. DSC-TGA studies showed the thermal stability of PS-polyurethane up to 200 °C and degradation proceeding in five stages. Dilatometry studies revealed that the first-degree thermal degradation over 200 °C causes a serious loss of mechanical properties.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Durability of PS-Polyurethane Dedicated for Composite Strengthening Applications in Masonry and Concrete Structures

Kwiecień

Stryszewska

et al. 2020

Polymers

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“…For I-CF/EP and I-CF/EP-SCA, C1s core-level spectrum can be fitted into three peaks, of which a new peak at 287.3 eV associated with C=O was found. The appearance of the C=O peak is mainly caused by the epoxy coating and the silane coupling agent [33,34]. In Figure 6e, the increase of C–OH and C=O peaks is due to the high content of hydroxyl groups in HMC.…”

Section: Resultsmentioning

confidence: 99%

Study on the Mechanical Properties and Strengthening Mechanism of Interface-Modified Carbon Fiber Mesh Reinforced Cement-Based Composites with SCA&HMC

Luo

et al. 2019

Molecules

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Carbon fiber mesh reinforced cement-based composites (CMCCs) have received extensive attention in the field of engineering repair and structural reinforcement due to their outstanding properties such as two-way force, rust prevention, high specific strength, and low base surface requirements. However, the development of this material has been slowed down to some extent due to the poor interfacial bonding between the carbon fiber mesh and the cement matrix. In this paper, a novel fabrication strategy was proposed in which the carbon fiber mesh was modified with epoxy resin and silane coupling agent (SCA) to increase its surface chemical activity. Meanwhile, the hydroxymethyl cellulose (HMC) was also filled into the concrete matrix to improve the mechanical strength of the matrix as well as the load transfer behaviors between the mortar and carbon fiber (CF) mesh. The potential to employ SCA and HMC was evaluated for the making of CMCCs via the above methods. The results showed that the longitudinal shear strength of composites with SCA and SCA&HMC increased by 26.6% and 56.1% compared to those of CF with epoxy resin (EP) reinforced composites, respectively. The flexural strength of composite with SCA&HMC increases by 147.6% compared to I-(F) without CF. The novel II-HCM&CF/EP-SCA composites with excellent performance are promised to be applied in practical uses.

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“…It should be noted here that highly deformable polyurethane is relatively new material, and in SRP applications, it still requires better understanding. Research provided by Kwiecien et al [36] proved that in clay, brick substrate polyurethane matrix increases the ultimate bond by 80%.…”

Section: Bond Behaviormentioning

confidence: 99%

Steel-Reinforced Polymers and Steel-Reinforced Composite Mortars for Structural Applications—An Overview

Krzywoń

2020

J. Compos. Sci.

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Bonding of external reinforcement is currently the simplest, fastest, and most popular method of strengthening concrete and masonry structures. Glass and carbon organic fibers are the dominant materials used, but alternatives also include high-strength steel wires. The mechanical properties of such steel are comparable to those of carbon fiber. Due to their good compatibility with mortars, steel wires are particularly well suited to the revitalization of historic buildings. The manuscript provides an overview of research and experience in the use of steel-reinforced polymers (SRPs) and steel-reinforced composite mortars (SRCMs, also called steel-reinforced grout (SRG)) for structural strengthening. The examples described are for concrete beams, slabs and columns, walls, and masonry arches. The results of laboratory tests are discussed. The summary presents the advantages and disadvantages of composites based on ultra-high-strength steels compared with more popular carbon fiber composites.

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Flexible Adhesive in Composite-to-Brick Strengthening—Experimental and Numerical Study

Cited by 19 publications

References 41 publications

Durability of PS-Polyurethane Dedicated for Composite Strengthening Applications in Masonry and Concrete Structures

Durability of PS-Polyurethane Dedicated for Composite Strengthening Applications in Masonry and Concrete Structures

Study on the Mechanical Properties and Strengthening Mechanism of Interface-Modified Carbon Fiber Mesh Reinforced Cement-Based Composites with SCA&HMC

Steel-Reinforced Polymers and Steel-Reinforced Composite Mortars for Structural Applications—An Overview

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