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Mechanical properties and microstructure of autoclaved green UHPC blended with granite stone powders

  • Yongning Liang , Yizhou Zhuang , Y. Frank Chen , Tao Ji , Yichun Huang and Zhen Ng
Published/Copyright: November 2, 2018
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Abstract

Granite stone powder is a common type of stone-product industrial waste spreading over Fujian Province and other areas of China, causing serious environmental problems. This paper investigates the possibility of using granite stone powder to completely or partially replace quartz powder for preparing “Green” or “Eco” ultra-high performance concrete under autoclave curing regimes. The mechanical properties and microstructure of autoclaved ultra-high-performance concrete (UHPC) mixed with different replacement ratios of granite stone powders were tested. It was found that its mechanical properties still satisfied the original requirements even after total replacement of quartz powders by granite stone powders. Despite of a slight decrease in flowability after total replacement, flexural and compressive strength did not change significantly. The hydration product of flaky tobermorite crystal was found in both granite stone powder blended UHPC and in quartz powder blended UHPC, while the Ca/Si ratio varied slightly. Furthermore, the pore structure of unadulterated UHPC improved due to a larger population of harmless and less-harmful pores after quartz powder were replaced by granite stone powder.

Kurzfassung

Granitpulver ist eine häufige Art von Industrie-Gesteinsabfällen, die überall in der Provinz Fujian und in China verteilt sind und erhebliche Umweltschädigungen nach sich zieht. In der diesem Beitrag zugrunde liegenden Studie wurde die Möglichkeit untersucht, Granitpulver zu verwenden, um vollständig oder teilweise Quartzpulver zu ersetzen, um umweltfreundlichen hochfesten Beton (Ultra-High Performance Concrete – UHPC) unter Autoklavbedingungen herzustellen. Die mechanischen Eigenschaften und die Mikrostruktur von im Autoklav hergestellten UHPC, die mit verschiedenen Verhältnissen von Granitpulver als Ersatz gemischt wurden, wurden geprüft. Es stellte sich heraus, dass dessen mechanische Eigenschaften selbst dann die ursprünglichen Anforderungen erfüllen, wenn die Quartzpulver zu 100 % durch Granitpulver ersetzt werden. Trotz einer leichten Abnahme der Fließfähigkeit nach 100 % Ersatz änderten sich die Biegefestigkeit und die Druckfestigkeit nicht signifikant. Das Hydratisierungsprodukt eines flockigen Tobermoritkristalles wurde sowohl im mit Granitpulver als auch im mit Quartzpulver gemischten UHPC gefunden, während das Ca/Si-Verhältnis leicht unterschiedlich war. Darüber hinaus wurde die Porenstruktur des UHPC verbessert, indem sich eine größere Ansiedelung von harmlosen und weniger kritischen Poren einstellte, nachdem die Quartzpulver durch Granitpulver ersetzt wurden.


*Correspondence Address, Prof. Dr. Yizhou Zhuang, School of Civil Engineering and Architecture, Zhejiang University of Technology, Hangzhou, Zhejiang Province, 310014, P. R. China, E-mail:
** Prof. Dr. Y. Frank Chen, Department of Civil Engineering, The Pennsylvania State University, 777 W Harrisburg Pike, Middletown, PA 17057, USA, E-mail:

Dr. Yongning Liang, born in 1977, is currently an associate professor at Fuzhou University, Fuzhou, China. She obtained her PhD degree in Structural Engineering from 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.

Dr. Yizhou Zhuang, born in 1964, is currently a Distinguished Professor at Zhejiang University of Technology and Fuzhou University, both in China. He obtained his first PhD degree of Structural Engineering from the Dalian University of Technology, Dalian, China in 1996 and a second PhD degree of 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. Y. Frank Chen, born in 1956, is currently Distinguished Professor at the East China Jiaotong University, Chongqing University, and Southwest University, both in China) and Tenured Professor at Pennsylvania State University, Middletown, USA. He obtained his PhD degree from 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.

Dr. Tao Ji, born in 1972, is a 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.

Yichun Huang, born in 1989, is an engineer at the Holsin Engineering Consulting Co. Ltd., Xiamen, China. He obtained his MSc degree from Fuzhou University, China in 2015. His field of interest focuses on the mechanical properties of civil materials.

Zhen Ng, born in 1995, is an MSc student in Tunnelling and Underground Space at the University of Warwick in Coventry, UK. He holds an Honours Undergraduate Degree in Civil Engineering from the University of Dundee, Dundee, UK.


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Published Online: 2018-11-02
Published in Print: 2018-11-15

© 2018, Carl Hanser Verlag, München

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