Effect of casting and curing temperature on the interfacial bond strength of epoxy bonded concretes

Daneshvar, Dana; Deix, Karl; Robisson, Agathe

doi:10.1016/j.conbuildmat.2021.124328

Cited by 31 publications

(7 citation statements)

References 54 publications

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“…Based on the location of the main cracks after specimen failure, the failure modes can be categorized into cohesive failure and adhesive failure. Within adhesive failure, there are two failure paths: serrated interfacial failure and alternating crack [66]. As shown in Figure 10, all specimens, except for C30-III-G95, exhibited adhesive failure.…”

Section: Basic Mechanical Properties and Environmental Benefits Of Egcmentioning

confidence: 93%

Experimental Investigation of the Bond Performance at the Interface between Engineered Geopolymer Composites and Existing Concrete

Li,

Tan,

Ouyang

et al. 2024

Buildings

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Engineered geopolymer composite (EGC) exhibits ultra-high toughness, excellent crack control capability, and superior durability, making it highly promising for applications in bridge connecting slabs, wet joints of prefabricated components, and concrete structure reinforcement. However, the bond performance and failure mechanisms at the interface between EGC and existing concrete remain unclear. To elucidate the bond performance of EGC to existing concrete, direct shear tests were conducted on 15 sets of EGC–existing concrete bond specimens. This study explored the effects of existing concrete strength, interface roughness, and EGC strength on the bond performance and mechanisms. Additionally, a direct shear bond mechanical model was established to predict the interface bond strength. The results indicate that, with comparable compressive strength, the preparation of EGC can reduce the total carbon emissions by up to 127% compared to ECC. The failure mode of EGC-existing concrete bond specimens was mainly adhesive failure (except for specimen C30-III-G95), which can be categorized into serrated interfacial failure and alternating crack paths. The change in interface roughness was the primary factor leading to the transition between failure paths. The changes in interface roughness and EGC strength significantly influenced the bond performance. Under their combined effect, the interface bond strength of specimen C50-III-G95 increased by 345% compared to C50-I-G45. In contrast, the improvement in existing concrete strength had a relatively smaller effect on the increase in interface bond strength. Based on the experimental results and the bonding mechanism under direct shear stress, a direct shear bond mechanical model correlating existing concrete strength, interface roughness, and EGC strength was established. The model predictions showed good consistency with the experimental results. This study provides theoretical support and experimental data for the engineering application of EGC.

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Section: Basic Mechanical Properties and Environmental Benefits Of Egcmentioning

confidence: 93%

Experimental Investigation of the Bond Performance at the Interface between Engineered Geopolymer Composites and Existing Concrete

Li,

Tan,

Ouyang

et al. 2024

Buildings

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“…S1). The curing time necessary to achieve a castable solution decreased from 24 h at room temperature to 3 h at 60 • C. However, the membrane cured at 60 • C was brittle, probably due to the lower yield stress of the polymer and the increased stiffness [39] (Fig. 3a).…”

Section: Optimization Of the Synthesis And Performance Of Pei-cured P...mentioning

confidence: 99%

Polyethyleneimine-cured epoxy-based solvent tolerant nanofiltration membranes

Fadil

Bull

Bastin

et al. 2023

Journal of Membrane Science

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“…Additionally, these junctions represent potential points of weakness where cracks may propagate under conditions such as re exposure or horizontal loads, ultimately diminishing the material's mechanical integrity [26]. Strengthening the interfacial interface between the new and old concrete is crucial to verifying the consistent behavior of structural parts [27]. Adding well-anchored interfacial shear ties is a frequently used technique to improve bonding and shear resistance.…”

Section: Introductionmentioning

confidence: 99%

Effect of Steel Fibers on the Interfacial Shear Strength of Flyash and GGBS based Geopolymer concrete activated with water glass

Sangi,

Bollaprag

2024

Preprint

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Concrete, a fundamental construction material, heavily relies on cement, manufacturing process of cement results in significant CO2 emissions, posing environmental concerns. Hence, exploring substitutes for cement becomes imperative to mitigate CO2 emissions. Geopolymer materials emerge as promising alternatives capable of entirely replacing Ordinary Portland Cement (OPC). However, these materials necessitate activators to initiate the polymerization reaction. While Na2SiO3 and NaOH are commonly utilized as activators, their cost-effectiveness is questionable. Moreover, when Ground Granulated Blast Furnace Slag (GGBS) reacts rapidly with these activators. To address these issues and streamline concrete production, "water glass" is employed as an activator, offering a solution to avoid rapid setting and economize the production process. In other hand the production of mass concrete structures, interfaces and joints critical points where cracks may develop. To ensure monolithic behavior, shear ties were advised at the interface in order to establish strong bond strength. However, the efficiency of construction could be decreased by adding more shear ties. The purpose of this study is to evaluate the interfacial shear strength of Geopolymer concrete(GPC), With the addition of different percentages (0.5,1%, 1.5%, and 2%), and 30mm length of crimpled steel fibers together with shear ties at the interface of push-off specimens. The findings reveal that it is viable to replace two shear ties with one 8mm-2L shear tie and 1% crimped steel fibers of 30mm length.

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Effect of casting and curing temperature on the interfacial bond strength of epoxy bonded concretes

Cited by 31 publications

References 54 publications

Experimental Investigation of the Bond Performance at the Interface between Engineered Geopolymer Composites and Existing Concrete

Experimental Investigation of the Bond Performance at the Interface between Engineered Geopolymer Composites and Existing Concrete

Polyethyleneimine-cured epoxy-based solvent tolerant nanofiltration membranes

Effect of Steel Fibers on the Interfacial Shear Strength of Flyash and GGBS based Geopolymer concrete activated with water glass

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