NMR Study on the Pore Structure Development of Cement Paste with Bleeding during Hydration
Publication: Journal of Materials in Civil Engineering
Volume 32, Issue 12
Abstract
Previous studies focused on the determination and simulation of the bleeding extent of fresh cement paste and provided objective conclusions. However, few studies exist on the influence of bleeding on the final structure of cement paste. This study focused on the microstructure development during the hydration of cement paste with various bleeding caused by the water-cement ratio, the slag replacement, and the superplasticizer. To obtain information on the porosity profile and pore size distribution, the sample was measured using a low-field nuclear magnetic resonance (NMR) with Hahn spin sequence and Carr-Purcell-Meiboom-Gill (CPMG) sequence from top to bottom. The results showed that increasing bleeding thickness leads to a heterogeneous structure from top to bottom in terms of porosity profile and pore size distribution. Moreover, hydration can reduce the difference in the pore structure, especially when the bleeding depth is small. It was also found that the influence of bleeding depth on the pore size distribution of gels pores during hydration is minor compared with that of the capillary pores. Furthermore, detailed discussions on the connections between the bleeding and the final structure are presented in this paper.
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Data Availability Statement
Some or all of the data, models, or code that support the findings of this study are available from the corresponding author on reasonable request [i.e., MATLAB code and all NMR data].
Acknowledgments
The authors want to acknowledge the financial support provided by the China National Key R&D Program during the 13th Five-year Plan Period (Grant No. 2016YFC0701004), the National Natural Science Foundation of China (Grant No. 51678441), the Science and Technology Commission of Shanghai Municipality (Grant Nos. 19DZ1202702 and 19DZ1201404), and the Key Science and Technology Foundation of Gansu Province (Grant No. 19YF3GA004). Gratitude is expressed for the support from the Shanghai Post-doctoral Excellence Program (2019–2020) and Visiting Scientist project in Darcy Center of TU/e (2019–2020), the “High-level Foreign Experts” project at Tongji University, and the China Scholarship Council. We would also like to thank Niumag Electric Corporation (Shanghai, China) for its assistance in performing these measurements.
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Published In
Journal of Materials in Civil Engineering
Volume 32 • Issue 12 • December 2020
Copyright
© 2020 American Society of Civil Engineers.
History
Received: Jan 13, 2020
Accepted: Jun 2, 2020
Published online: Sep 21, 2020
Published in print: Dec 1, 2020
Discussion open until: Feb 21, 2021
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