自干燥及水分扩散引起的高性能混凝土内部湿度演变

doi:10.11896/cldb.18060063

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Abstract In order to explore the influence of self-desiccation and moisture diffusion on the internal humidity evolution of high performance concrete, specimens were subjected to self-desiccation condition and constant temperature and humidity condition. Then the evolution law of humidity under above conditions was systematically investigated. The results show that the internal humidity decrement caused by self-desiccation mainly occurs within the age of 28 d while that triggered by moisture distribution mainly occurs within the age of 14 d. Besides, the adding of fly ash decreases humidity decrement significantly either induced by self-desiccation or moisture diffusion and makes the matrix stay in the moisture saturation phase for at least 8 d. However, the mixture of ground granulated blast furnace slag accelerates internal humidity decrement. Moreover, the evolution of internal humidity is dominated by self-desiccation in the early stage, and when the dosage of fly ash was 50%, moisture diffusion takes the lead. Furthermore, with increase of water to binder ratio or the decrease of depth, the percentage of self-desiccation influence on humidity decrement descends gradually accompanied by the increasing proportion of moisture diffusion influence.

Key words： high performance concrete humidity self-desiccation moisture diffusion

Published: 19 June 2019

CLC number:

TU528.01

Fund:This work was financially supported by the National Basic Research Program of China (973 Program) (2015CB655100), the National Natural Science Foundation (51178230, 51378269, 5142010501), and the Fundamental Research Funds of Shandong University (31560078614117).

About author:: Zuquan Jingraduated from Jiaozuo Institute of Technology in 1998 and received his M.S. degree from Henan Polytechnic University in 2003. He received his Ph.D. degree from Southeast University in 2006. From 2009 to 2011, he worked as a postdoctoral researcher in the Institute of Oceanology, Chinese Academy of Sciences. From 2014 to 2015, he visited University College London and once won the “Huo Yingdong youth teacher award”. He is currently a full professor in Qingdao University of Technology. His research interests are durability performance of concrete in marine environment and ultra-high strength cement based materials.Honglei Changobtained his Ph.D. degree from Southeast University in 2018. He is currently an assistant researcher and postgraduate tutor at Shandong University. His research area is mainly about the preparation of high performance cement-based materials, durability and degradation mechanisms. He has participated in several national projects. And he has published 18 academic papers, including 6 papers indexed by some top international journals in civil engineering materials, such as Cement and Concrete Research, Cement and Concrete Composites, etc.

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Cite this article:

CHANG Honglei,JIN Zuquan,LIU Jian. Relative Humidity Evolution of High Performance Concrete Caused by Self-desiccation and Moisture diffusion[J]. Materials Reports, 2019, 33(14): 2370-2375.

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http://www.mater-rep.com/EN/10.11896/cldb.18060063 OR http://www.mater-rep.com/EN/Y2019/V33/I14/2370

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