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Flexural strength of weathered granites under wetting - drying cycles: Implications to steel structures

journal contribution
posted on 22.01.2020, 00:00 by S Noor-E-Khuda, Faris AlbermaniFaris Albermani, Sarkar Noor E KhudaSarkar Noor E Khuda
Deterioration of stone veneer cladding panels due to environmental weathering can lead to expensive restoration work, serious risks from falling debris and compromises the performance of high-rise steel and concrete structures. The influence of wetting - drying cycles (WDC) on the flexural tensile strength of thin granite cladding panels is investigated. Forty-five specimens of Imperial Black, Calca and Grandee type Australian granite panels were used in the experimental program. Total 15 specimens served as control reference, while 30 specimens were subjected to 100 WDC in two separate stages. The wetting cycles were conducted in contact with tapwater and acidified solution of pH-4.5, while the drying cycles were conducted using a controlled drying chamber at 40 oC. Ultrasonic pulse velocity (UPV) and flexural tensile strength of the control, and weathered specimens were measured after the 50th and 100th weathering cycle of WDC. It was noticed that the thin granite cladding panels experienced limited flexural strength reduction accompanied by changes in UPV and weight loss. A correlation between flexural strength and UPV of the unweathered and weathered WDC specimens is proposed which can be useful in on-site assessment of granite cladding panels during the service life of the primary steel structure. © 2019 by The Hong Kong Institute of Steel Construction. All rights reserved.

History

Volume

15

Issue

3

Start Page

225

End Page

231

Number of Pages

7

ISSN

1816-112X

Publisher

Hong Kong Institute of Steel Construction

Peer Reviewed

Yes

Open Access

No

Acceptance Date

25/10/2018

Era Eligible

Yes

Journal

Advanced Steel Construction