Influence of freeze–thaw cycles on the pull-out response of lime-based TRM composites

Dalalbashi, Ali; Ghiassi, Bahman; Oliveira, Daniel V.

doi:10.1016/j.conbuildmat.2021.125473

Cited by 10 publications

(4 citation statements)

References 38 publications

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“…In some cases, there were strength gains as a result of aging. A similar pattern of property gain after aging was reported by Ghiassi and Oliveira [45], who aged lime-based mortar specimens using freeze-thaw cycles. The authors justified their results based on the proposition of mechanisms beneficial to the mechanical properties that occurred during aging, which probably outweighed the damage caused by the severe conditions imposed.…”

Section: Aging Testssupporting

confidence: 84%

Use of Dregs as a Replacement for Hydrated Lime in Cement Coating Mortar

et al. 2023

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The pulp and paper industry generates a significant volume of solid waste during its operations. In order to mitigate the environmental impact caused by this industry, one of its residues was applied in eco-friendly composites. Therefore, this research aims to use green liquor dregs as a partial replacement for lime in coating mortars. Hydrated lime was replaced by dregs in percentages of 10%, 15%, 20%, and 30%, and the manufactured mortar specimens were tested in terms of their flowability, air content, and specific gravity in the fresh state. In the hardened state, physical and chemical characterization was carried out to determine the influence of the introduction of the dregs on the properties of the different types of mortar. Mechanical testing of the mortar specimens’ compressive, flexural, and adhesive strengths was carried out, and scanning electron microscopy was performed to evaluate the microstructural features of the cement composites. In general, the types of mortar with dregs showed a high degree of similarity to conventional mortar in all studied aspects, including the 30% replacement group. The obtained SEM images indicated that the presence of dregs in the mortar did not change the formational mechanism of C-S-H crystals, maintaining the mechanical properties of the material even after the accelerated aging procedure was performed, reaching similar levels of flexural, compressive, and tensile bond strengths when compared to the neat mortar. Furthermore, tensile bond levels reached approximately 0.9 MPa for all the studied types of mortar, allowing the material to be used in external applications.

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Section: Aging Testssupporting

confidence: 84%

Use of Dregs as a Replacement for Hydrated Lime in Cement Coating Mortar

et al. 2023

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“…Several investigations have been conducted under different exposure conditions. These indicate a minor influence of frost exposure on the bond and tensile bearing behavior of TRC members 28–30 …”

Section: Rehabilitation Of Road Surface Using Textile‐reinforced Conc...mentioning

confidence: 89%

“…These indicate a minor influence of frost exposure on the bond and tensile bearing behavior of TRC members. [28][29][30] However, frost exposure causes structural damage to concrete, and in particular, scaling of the concrete surface if de-icing agents (e.g., NaCl) are used. In case of concrete used in infrastructural applications, this is a crucial environmental impact.…”

Section: Frost Scaling Of Concretementioning

confidence: 99%

Experimental investigation on salt frost scaling of textile‐reinforced concrete

Konzilia

Egger

Feix

2022

Structural Concrete

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With the aim of reducing life cycle costs and dead weight, there are various concepts for replacing bridge pavements and sealants with high‐performance concrete. The corrosion resistance of textile reinforcements allows the realization of thin reinforcement layers that fulfill this objective. However, the textile‐reinforced concrete used as a road surface must meet the particular requirements relating to frost resistance and, specifically, scaling. An investigation on an existing structure indicated the influence of textile reinforcements on frost resistance. Therefore, the present investigations focus on the frost scaling of different combinations of a carbon reinforcement and fine‐grained concrete. For this purpose, a multistage research design is used. First, the influence of the reinforcement and the concrete mix on the capillary porosity is investigated. The capillary porosity of concrete is directly related to its resistance to freeze–thaw scaling. This resistance is examined using the slab‐test method. Finally, the influence of the frost exposure on the pull‐off strength, which is crucial for the strengthening of structures, is determined.

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“…In fact, FRCM composites may be exposed to a combination of different aggressive environmental conditions, such as humidity, rainfall, freeze/thaw cycles, exposure to saline and alkaline environments, and to medium and high temperature. In this framework, several studies were recently conducted about the behavior of FRCM composites when subjected to aggressive environments, analyzing how these conditions could affect their mechanical performances [27][28][29][30][31][32]. At the same time, the Italian Guidelines for the identification, qualification and acceptance control of FRCM composites to be used for the structural strengthening of existing constructions [33] prescribe to evaluate the performances of these systems in presence of specific environmental actions.…”

Section: Introductionmentioning

confidence: 99%

Effect of temperature variations on the bond behavior of FRCM applied to masonry

2022

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In the last decades, Fiber Reinforced Cementitious Matrix (FRCM) composites were successfully introduced to repair and strengthen existing masonry structures. The good mechanical performances of these materials determined their efficiency as a strengthening technique; however, their durability is still an open issue. As a matter of fact, FRCM composites may be exposed to a combination of different environmental conditions and, additionally, to temperature variations due to solar radiation. The objective of this research was to study the effects of temperature variations on the bond behavior of a FRCM composite, constituted by a basalt grid and a lime-based mortar matrix, applied to masonry. For this purpose, an experimental investigation on thermally conditioned FRCM-strengthened masonry wallets is presented, in which 14 single-lap shear tests were performed. Before testing, samples were exposed to different target temperatures inside a climatic chamber: 32, 40, 50, 60 and 80 °C. Thermocouples were embedded within the FRCM reinforcing layers at two different depths to detect the inner temperature profiles and to control the conditioning process. The single-lap shear tests were then carried out inside the same climatic chamber, while maintaining the target temperature constant. A decrease in terms of peak-axial stress was observed by increasing temperature, along with a progressive change in the failure mode, from fiber rupture outside the bonded area to fiber slippage within the mortar matrix layers.

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Influence of freeze–thaw cycles on the pull-out response of lime-based TRM composites

Cited by 10 publications

References 38 publications

Use of Dregs as a Replacement for Hydrated Lime in Cement Coating Mortar

Use of Dregs as a Replacement for Hydrated Lime in Cement Coating Mortar

Experimental investigation on salt frost scaling of textile‐reinforced concrete

Effect of temperature variations on the bond behavior of FRCM applied to masonry

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