Effect of adhesive joint stiffness on optimal size of large-format cladding comparison of artificial and real environment

Nečasová, Barbora; Liška, Pavel; Šlanhof, Jiří; Kovářová, Barbora

doi:10.1016/j.ijadhadh.2019.102489

Cited by 5 publications

(6 citation statements)

References 17 publications

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“…It does not require any additional surface treatment or the application of a protective coating on the front side, and at the same time the authors had already proved that it is a material suitable for bonding and is compatible with selected adhesive systems. 30,31 The cladding is produced from the following: 63 wt% of wood chips, 25 wt% of Portland cement, 10 wt% of water and 2 wt% of additives promoting hydration (the manufacturer has not provided a detailed description of the additives). This type of particleboard is produced in the basic size of 1.25 × 3.35 m, which was adjusted to the size of the test specimen, 1.10 × 1.85 m. For façade cladding it is suitable to use particleboard with a thickness of 10–12 mm, the first variant with 10 mm being used in the presented case.…”

Section: Methodsmentioning

confidence: 99%

“…The model was based on the creation of an idealised structure. The numerical model of a reference façade section was created via simple linear construction and the limit load states needed for the calculation of the optimal cladding size were determined for each adhesive system, 31 see Table A1 in the supplementary materials. ETAG 034 recommends to test the worst conditions, thus, the largest calculated size of the cladding was tested in combination with all adhesive systems.…”

Section: Methodsmentioning

confidence: 99%

“…The effects of these were included in the numerical model. 31 The value of the negative wind pressure acting on the surface of the façade determined according to the EN 1991-1-4, i.e. 482.29 Pa (≈48.23 kg/m 2 ), 31 was included as well.…”

Section: Methodsmentioning

confidence: 99%

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Long adhesive joints in façade applications exposed to wind suction

Nečasová

Liška

Šlanhof

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part E:

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This paper provides an insight into the investigation of long thick-layer adhesive façade joint resistance to negative pressure loads, i.e. wind suction. The real structural response to wind actions was simulated with reference to ETAG 034. Each specimen represented a reference façade section. The experiment focused on four different adhesive systems with flexible high strength 1-K polyurethanes and 1-K modified silyl polymers. Several variants of the test assemblies were tested: 1) a test assembly with an adhesive joint when a) the manufacturers’ application instructions for the system were followed and b) the instructions were violated; 2) a test assembly with a mechanical joint. These variants made it possible to compare the properties of both fastening methods, and moreover, to assess the impact of the mounting tape on the properties of the adhesive joint. The comparison of adhesive joints and a mechanical joint proved the greater structural stiffness and stress resistance of bonded assemblies. Monitoring showed that a local failure of the fastening element between the load-bearing frame and supporting structure caused the failure of the bonded assemblies, whereas the specimen with mechanically attached cladding failed due to pull-through of the fasteners. The average failure load of the bonded assembly was 10.88 kPa. In contrast, the failure load of the segment with mechanical fasteners was 10.12 kPa. Even though the difference in maximum pressure loads was only around 7%, the recorded values clearly demonstrate that the weakest part of the whole façade system is the mechanical joint, not the bonded one. Furthermore, the comparison of the results for segments with and without mounting tape showed that tape can have a major impact on the bond strength, since in case of the test specimens without mounting tape, the recorded failure load was a maximum of 30% higher.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Long adhesive joints in façade applications exposed to wind suction

Nečasová

Liška

Šlanhof

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part E:

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“…The same substrate as in the I and II phase was used, i.e., 10-mm-thick particleboard. The appropriate size of the façade panels was determined on the basis of a numerical model [31]. The largest size of the panel was 915 × 1615 mm.…”

Section: Real Façade Applicationmentioning

confidence: 99%

Research Summary on Characterizing Impact of Environment on Adhesion of Sealed Joints in Façade Applications

Nečasová¹,

Liška²

2020

Materials

Self Cite

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The presented paper summarizes the main research findings on the impact of the environment concerning the durability and service life of building joint sealants. The focus is placed on sealed joints in façade applications, which can serve different purposes and can also be several meters long which often intensifies the stresses that the joint needs to withstand and therefore its service life can be significantly shortened. Different approaches, test sample geometries and high-performance sealants, were used in this context to determine the most critical aspects for the studied application sector. The research was divided into three phases where the joints were subjected to (I) artificial weathering in a laboratory environment, (II) real weathering in an external environment, and (III) weathering via a real application that was monitored for almost 4 years. The extensive research scope confirmed one commonly known presumption, that standardized artificial weathering/aging methods are not able, from a long-term perspective, to simulate the impact of a real environment. The most valuable results were obtained in the third phase of the research, where the monitoring of a real façade brought to light completely different conclusions. The joints exposed to the real environment were either completely deteriorated or showed signs of advanced aging.

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“…Cladding fires are complex in nature, as multiple factors such as cavity depth, core materials, and environmental conditions can significantly affect the fire spread behavior. Many researchers dedicate their effort to focusing on different aspects of cladding fire [122][123][124][125][126][127]. In this section, we summarized the typical experimental studies on the cladding systems in the latest decade.One of the earliest work on cladding panel fires is carried out by Yoshioka et al, in which a study of a test method in the form that flame blown from the aperture (910 mm square) roasts the façadetype test body (4095 mm high × 1820 mm wide) in 2011.…”

mentioning

confidence: 99%