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Microstructure-Based Relative Humidity in Cementitious System Due to Self-Desiccation

1
Fujian Provincial University Research Center for Advanced Civil Engineering Materials, Fuzhou University, Fuzhou 350116, China
2
College of Civil Engineering, Fuzhou University, Fuzhou 350116, China
3
Microlab, Section of Materials and Environment, Department of 3MD, Faculty of Civil Engineering and Geosciences, Delft University of Technology, Stevinweg 1, 2628 CN Delft, The Netherlands
4
Guangzhou University-Tamkang University Joint Research Center for Engineering Structure Disaster Prevention and Control, Guangzhou University, Guangzhou 510006, China
*
Authors to whom correspondence should be addressed.
Materials 2019, 12(8), 1214; https://doi.org/10.3390/ma12081214
Received: 15 March 2019 / Revised: 3 April 2019 / Accepted: 8 April 2019 / Published: 13 April 2019
(This article belongs to the Section Construction and Building Materials)
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Abstract

The internal relative humidity (RH) plays a crucial role in most of the concrete properties. Self-desiccation caused by continuous cement hydration is a major factor affecting the RH of concrete. This paper investigates the relationship between RH and microstructure for cementitious systems in the case of self-desiccation. A series of paste specimens prepared with different binder and water-binder-ratio (w/b) were cured under sealed conditions from 1 day to 1.5 years. The RH and microstructure of the paste specimens were measured. The microstructure characteristics under study include porosity, pore size, evaporable and non-evaporable water content. The results reveal that the RH of cementitious system drops to a great extent in the first 105 days’ hydration and decreases slowly afterwards. The blended materials such as fly ash, slag or limestone powder have different influences on the RH. A mathematical model between RH and the average pore diameter is proposed for cementitious systems under self-desiccation, regardless of age, w/b or cement type. View Full-Text
Keywords: cementitious system; self-desiccation; relative humidity; microstructure; average pore diameter cementitious system; self-desiccation; relative humidity; microstructure; average pore diameter
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Zhang, Y.; Ouyang, X.; Yang, Z. Microstructure-Based Relative Humidity in Cementitious System Due to Self-Desiccation. Materials 2019, 12, 1214.

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