Bond strength of alkali-activated slag based tunnel fireproof coating material

Yizhou Zhuang; Yongning Liang; Y. Frank Chen; Tao Ji; Zhen Ng

doi:10.3139/120.111274

Article

Bond strength of alkali-activated slag based tunnel fireproof coating material

Yizhou Zhuang , Yongning Liang , Y. Frank Chen , Tao Ji and Zhen Ng

Published/Copyright: January 18, 2019

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From the journal Materials Testing Volume 60 Issue 12

Abstract

The influence of the concentration of sodium hydroxide solution on the tensile bond strength of alkali-activated slags (AAS) used as a tunnel fireproof coating material was studied under the simulated combined action of vibration and wind suction. A test method involving the simultaneous application of vibration and suction was developed and utilized. The test results indicate that as the concentration of sodium hydroxide solution in the AAS increases from 1 to 10 weight percentage, the bond strength of AAS coating improves under the coupling action of vibration and suction. Furthermore, the cumulative pore volume and the average pore diameter in the AAS are reduced and the ratio of harmful pores to total pores decreases. As the concentration of sodium hydroxide solution increases more than 10 weight percentage, however, there is no further benefit in terms of the pore structure and bond strength.

Kurzfassung

Der Einfluss der Konzentration der Natronlaugenkonzentration auf die Bindungsfestigkeit unter Zugbeanspruchung von alkali-aktivierten Schlacken (Alkali-Activated Slags (AAS)), die als feuerfeste Beschichtungsmaterialien für Tunnel verwandt werden, wurde unter der kombinierten Einwirkung von Vibration und Windsogbeanspruchung untersucht. Hierzu wurde ein Prüfverfahren, das das gleichzeitige Einbringen von Vibrationen und Sog ermöglicht, entwickelt und angewandt. Die Versuchsergebnisse zeigen, dass seine Erhöhung der Natronlaugekonzentration in den AAS von 1 auf 10 wt.-% die Bindungsfestigkeit der AAS-Beschichtung unter der gekoppelten Einwirkung von Vibration und Sog verbessert. Darüber hinaus reduzieren sich das kumulative Porenvolumen und der durchschnittliche Porendurchmesser im AAS und das Verhältnis von gefährlichen Poren zur Gesamtanzahl der Poren reduziert sich. Wenn die Konzentration der Natronlauge über 10 wt.-% zunimmt, stellt sich allerdings kein weiterer Vorteil bezüglich der Porenstruktur und der Bindungsfestigkeit ein.

*Correspondence Address, Assoc. Prof. Dr. Yongning Liang, College of Civil Engineering, Fuzhou University, No. 2 Xueyuan Road, University City, Fuzhou, Fujian Province, 350108, P. R. China

Prof. Dr. Yizhou Zhuang, born in 1964, is currently Distinguished Professor at Zhejiang University of Technology, Hangzhou, and Fuzhou University, Fuzhou, both in China. He obtained his first PhD degree in Structural Engineering from the Dalian University of Technology, Dalian, China in 1996 and his second PhD degree in Bridge Engineering from Wayne State University, Detroit, USA in 2006. He specializes in bridge engineering, structural engineering, soil-structure interaction, computational method and construction materials.

Dr. Yongning Liang, born in 1977, is currently Associate Professor at Fuzhou University, Fuzhou, China. She obtained her PhD degree in Structural Engineering at the China University of Mining and Technology, Xuzhou, China in 2005. She specializes in the mechanical properties of civil materials and the durability of civil materials.

Prof. Dr. Y. Frank Chen, born in 1956, is currently Tenured Professor at Pennsylvania State University, Middletown, USA. He obtained his PhD degree at the University of Minnesota, Minneapolis, USA in 1988. He specializes in dynamic soil-structure interaction, computational methods, bridge engineering, foundations, dynamic-load resistant designs, geo-environmental engineering, and construction materials.

Prof. Dr. Tao Ji, born in 1972, is Professor at the College of Civil Engineering at Fuzhou University, Fuzhou, Fujian Province, China. He obtained a Doctorate degree in Structural Engineering from Zhejiang University, Hangzhou, China in 2000. His research interests focus on advanced construction materials.

Zhen Ng, born in 1995, is a Master's student in the field of tunneling and underground space at the University of Warwick, UK. He holds an honor's undergraduate degree in Civil Engineering from the University of Dundee, UK.

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Published Online: 2019-01-18

Published in Print: 2018-12-04

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https://doi.org/10.3139/120.111274