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Materials and Structures

, Volume 47, Issue 11, pp 1941–1951 | Cite as

Study on water sorptivity of the surface layer of concrete

  • Jun Liu
  • Feng Xing
  • Biqin Dong
  • Hongyan Ma
  • Dong Pan
Original Article

Abstract

This paper presents the results from a study of water sorptivity of concrete surface layer. The sorptivity is characterized by a surface sorptivity index as measured by Autoclam. In this study, different types of concrete were immersed in ultrapure water and NaCl solution prior to the sorptivity test. The influences of several factors on the value and evolution of concrete surface sorptivity index are discussed. It is found that: concrete surface sorptivity is a function of the pore structure, higher porosity and lower tortuosity lead to higher surface sorptivity; as cured in moist condition for 1 month, the surface sorptivity is an increasing function of w/c in plain cement concretes, and an increasing function of fly ash replacement if w/b is kept constant; surface sorptivity increases as immersed in ultrapure water in the first month of immersion due to leaching, and decreases thereafter as the continuous hydration of cementitious materials makes the pore structure finer and finer; the immersion in NaCl solution limits the effect of leaching because of the formation of calcium oxychloride compounds, and results in lower long-term surface sorptivity index as compared with the ultrapure water immersion, due to the formation of Friedel’s salt which reduces the pore volume and blocks the pore network.

Keywords

Sorptivity Surface layer Concrete Pore structure Ultrapure water Chloride 

Notes

Acknowledgments

The financial supports from National Basic Research Program of China (2011CB013604), National Science Fund for Distinguished Young Scholars (50925829), Natural Science Foundation of China (51108271), Natural Science Foundation for the Team Project of Guangdong Province (9351806001000001), Shenzhen city science and technology project (JC201005280569A), State Key Laboratory of High Performance Civil Engineering Materials (2010CEM016) and Ministry of Housing and Ural-Rural Development of the People’s Republic of China (2010k419) are greatly acknowledged.

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Copyright information

© RILEM 2013

Authors and Affiliations

  1. 1.Guangdong Provincial Key Laboratory of Durability for Marine Civil EngineeringShenzhen UniversityShenzhenChina
  2. 2.Department of Civil and Environmental EngineeringThe Hong Kong University of Science and TechnologyHong KongChina

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