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A novel method for semi-quantitative analysis of hydration degree of cement by 1H low-field NMR
- Source :
- Cement and Concrete Research. 141:106329
- Publication Year :
- 2021
- Publisher :
- Elsevier BV, 2021.
-
Abstract
- Based on the analytical 1H low-field nuclear magnetic resonance (NMR) technique, we developed a novel method and corresponding model to analyze the hydration degree (αt) of cement in cement paste under different curing conditions. The hydration degree can be calculated quantitatively based on the transverse relaxation time (T2) distributions using NMR measurements. The T2 distributions of the cement paste samples with the water/cement (W/C) ratios of 0.25, 0.35 and 0.45 under standard curing, steam curing at 40 °C and steam curing at 60 °C were obtained. The αt of cement was studied by the hydration heat method and portlandite (CH) quantitative measurements. The results show that the intensity-weighted T2 value of non-surface water peaks ( T 2 ¯ ) has a significant correlation with αt that can be expressed by an exponential equation. In this paper, the derivation of this exponential equation is given, and the effects of W/C ratio and curing condition on its parameters are analyzed.
- Subjects :
- Cement
Materials science
0211 other engineering and technologies
Thermodynamics
02 engineering and technology
Building and Construction
engineering.material
021001 nanoscience & nanotechnology
Cement paste
T2 value
Portlandite
Exponential function
Transverse Relaxation Time
021105 building & construction
engineering
General Materials Science
0210 nano-technology
Semi quantitative
Curing (chemistry)
Subjects
Details
- ISSN :
- 00088846
- Volume :
- 141
- Database :
- OpenAIRE
- Journal :
- Cement and Concrete Research
- Accession number :
- edsair.doi...........f57b80aeebb2828f10644327086ad389