Influence of the moisture state of recycled fine aggregate on the impermeability of concrete

Yizhou Zhuang; Yongning Liang; Azam Nabizadeh; Zhen Ng; Tao Ji

doi:10.3139/120.111412

Article

Influence of the moisture state of recycled fine aggregate on the impermeability of concrete

Yizhou Zhuang , Yongning Liang , Azam Nabizadeh , Zhen Ng and Tao Ji

Published/Copyright: September 26, 2019

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From the journal Materials Testing Volume 61 Issue 10

Abstract

The impermeability of recycled fine aggregate concrete (RFAC) with different contents of recycled fine aggregate (RFA) was tested according to the standard test method of ASTM C1202. The moisture states of RFA were controlled at air-dried (AD), oven-dried (OD) and saturated surface-dried (SSD) states. Both the interfacial structure and the pore structure of RFAC were analyzed. Research results show that, for the same total water-cement (TWC) ratio and the same content of RFA, the interfacial transition region of RFAC became denser by increasing the moisture amount of RFA from oven-dried, air-dried to a saturated surface-dried state; meanwhile, the density and porosity of hardened cement paste (HCP) improved as well, which resulted in the higher impermeability of RFAC. Whereas by contrast, for the same moisture state and by increasing the RFA content, both the interfacial transition region and the property of the interface structure of RFAC became weaker. Also, the decreasing density and porosity of HCP resulted in lower impermeability of RFAC.

∗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, E-mail: yongningliang@163.com

Prof. Dr. Y. Frank Chen, Department of Civil Engineering, The Pennsylvania State University, 777 W Harrisburg Pike, Middletown, PA 17057-4898, USA, E-mail: yxc2@psu.edu

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

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

Prof. Y. Frank Chen, born in 1956, is currently a Tenured Professor at the 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, steel structures, and construction materials.

Azam Nabizadeh, is a PhD candidate in the Department of Civil and Environmental Engineering at the University of Wisconsin- Milwaukee (UWM), USA. She received her Master's degree from UWM in 2015. Her areas of research include the reliability of bridges, probabilistic assessment of fatigue in steel bridges, survival analysis of bridges, and repair of damaged pre-stressed bridges.

Zhen Ng, born in 1995, is a Master's student in Tunneling and Underground Space at the University of Warwick, Coventry, UK. He holds an Honors Undergraduate degree in Civil Engineering from the University of Dundee, UK.

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

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Published Online: 2019-09-26

Published in Print: 2019-10-02

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