Characterization of the Influence of an Accelerator upon the Porosity and Strength of Cement Paste by Nuclear Magnetic Resonance (NMR) Relaxometry
- 13 May 2022
- journal article
- research article
- Published by Taylor & Francis Ltd in Analytical Letters
- Vol. 56 (2), 303-311
- https://doi.org/10.1080/00032719.2022.2072855
Abstract
Designing of new cement-based materials, suitable for three-dimensional printing applications, requires accurate control of the porosity and strength development. This goal may be achieved by introducing the so-called accelerators in the cement mixture. One such accelerator, used in many commercial products, is calcium nitrate. In the present work, the effect of calcium nitrate on the kinetics of pore evolution and strength development was investigated using low-field nuclear magnetic resonance relaxometry and compressive tests. The presence of calcium nitrate in cement paste accelerates the hydration dynamics immediately after mixing but does not significantly affect the pore structure. Moreover, the presence of calcium nitrate increases the compressive strength at 7 days compared with the simple cement paste but the same compressive strength was reached following 28 days of hydration.Keywords
Funding Information
- Romanian Ministry of Education and Research
- CNCS - UEFISCDI
This publication has 20 references indexed in Scilit:
- Monitoring the size evolution of capillary pores in cement paste during the early hydration via diffusion in internal gradientsCement and Concrete Research, 2015
- The Effect of Curing Temperature on Early Hydration of Gray Cement Via Fast Field Cycling-NMR RelaxometryApplied Magnetic Resonance, 2014
- Summary for PolicymakersPublished by Cambridge University Press (CUP) ,2014
- The Effects of Different Superplasticizers and Water-to-Cement Ratios on the Hydration of Gray Cement Using T2-NMRApplied Magnetic Resonance, 2013
- Proton NMR relaxation as a probe for setting cement pastesMagnetic Resonance Imaging, 2008
- A Determination of Hydration Mechanisms for Tricalcium Silicate Using a Kinetic Cellular Automaton ModelJournal of the American Ceramic Society, 2008
- Effect of temperature on the pore solution, microstructure and hydration products of Portland cement pastesCement and Concrete Research, 2007
- Solving Fredholm integrals of the first kind with tensor product structure in 2 and 2.5 dimensionsIEEE Transactions on Signal Processing, 2002
- CONTIN: A general purpose constrained regularization program for inverting noisy linear algebraic and integral equationsComputer Physics Communications, 1982
- An experimental argument for the existence of a protective membrane surrounding portland cement during the induction periodCement and Concrete Research, 1979