Application of 1H NMR to hydration and porosity studies of lime–pozzolan mixtures

Tziotziou, Maria; Karakosta, Eleni; Karatasios, Ioannis; Diamantopoulos, G.; Sapalidis, Andreas; Fardis, M.; Maravelaki-Kalaitzaki, P.; Papavassiliou, G.; Kilikoglou, Vassilis

doi:10.1016/j.micromeso.2010.10.010

Cited by 26 publications

(10 citation statements)

References 49 publications

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“…核磁共振是磁矩不为零的原子核在外磁场作用下自旋能级发生塞曼分裂, 共振吸收某一定频率射频辐射的物理过程 [26] , 而停止射频照射后原子核从激化状态回复到平衡状态的过程称为弛豫 [27,28] [29] 基于Gibbs-Thomson 方程提出的一种定量测孔方法, Hansen等人 [30] 对其进行了补充与发展.…”

Section: 基本原理与方法unclassified

Nuclear magnetic resonance cryoporometry as a tool to measure pore size distribution of shale rock

et al. 2016

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Section: 基本原理与方法unclassified

Nuclear magnetic resonance cryoporometry as a tool to measure pore size distribution of shale rock

et al. 2016

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“…1 H Nuclear magnetic resonance (NMR) has been successfully used to investigate the morphology of C-S-H [35,36], carbonation fronts in cement paste [37], the porosity of lime-pozzolan mixtures and mortars [38,39], and superplasticizers in fresh cement [40,41]. One method used by [37], ignored fast diffusion.…”

Section: Microstructure Analysismentioning

confidence: 99%

“…Then, they were cured under water at 20 ± 1 • C. Prior to the NMR tests, samples were broken into pieces and immersed in alcohol to stop cement hydration for 2 days. The NMR tests were performed using a PQ-001 NMR (Niumag Corporation, Shanghai, China) as done in previous investigations in our laboratory [38,39]. The proton resonance frequency was 23 MHz and the permanent magnet was kept at 32 • C. The transverse magnetization decay was measured with the Carr-Purcell-Meiboom-Gill (CPMG) technique.…”

Section: Microstructure Analysismentioning

confidence: 99%

Compressive Strength and Durability of FGD Gypsum-Based Mortars Blended with Ground Granulated Blast Furnace Slag

2020

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One new flue gas desulfurization (FGD) gypsum-based binder is attempted in this article, which is made up of FGD gypsum, ground granulated blast furnace slag (GGBS) and ordinary Portland cement (OPC). Influences of raw materials, chemical activators, and curing conditions on the compressive strength of this new binder-based mortar, as well as its durability performances and microscopic characteristics, are investigated in consideration of utilizing FGD gypsum as much as possible. Results show that the compressive strength of this new binder-based mortar under normal curing conditions could increase along with GGBS dosages from three days to 90 days. The compressive strength of one selected mix proportion (FG-4550), which contains the highest dosage of FGD gypsum (45 wt.%), is much the same as those containing the highest dosage of GGBS. A better compressive strength of FG-4550 under normal curing conditions could be gained if the fineness of GGBS is improved. The activated effect of CaCl2 on the compressive strength of FG-4550 is superior to that of Ca(OH)2 under steam curing conditions. FG-4550 shows a good capacity for resistance to water, a low shrinkage ratio, but poor compressive strength after 30 freeze-thaw cycles. Based on the mineralogy of X-ray diffraction, the morphology of scanning electron microscopy and the pore diameter distributions of 1H nuclear magnetic resonance, the compressive strength of this FGD gypsum-based mortar mainly depends on clusters of ettringite.

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“…Zhang et al [21] measured pore characteristic parameters and pore-size distribution with exposure time by NMR technology. Tziotziou et al [22] applied 1 H nuclear magnetic resonance relaxation to monitor the hydration and porosity evolution of limepozzolan mixtures during its setting in real time. Zhou et al [23] investigated the pore structure of white cement mortars during water vapor adsorption kinetics by the NMR technique.…”

Section: Introductionmentioning

confidence: 99%

Permeability of Concrete and Correlation with Microstructure Parameters Determined by ¹H NMR

Zhang

Fang

et al. 2020

Advances in Materials Science and Engineering

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Water and gas permeability coefficients of concrete with different water-binder (w/b) ratios and admixtures were measured by a self-designed test device based on the steady-state flow method for liquid and the method of differential pressure in stability for gas, respectively. In addition, the micropore structure of concrete was determined by 1H nuclear magnetic resonance (NMR). Results indicated that there are good correlations between water and gas permeability of concrete with different w/b ratios, with correlation coefficient greater than 0.90. Better correlations between water permeability and segmental contributive porosity ranged from 10 to 100 nm and 100 to 1000 nm can be identified, but the gas permeability is more relevant to the segmental contributive porosity ranging from 100 to 1000 nm. Moreover, the correlation between water permeability and contributive porosity for each pore diameter is always better than that of gas permeability. The influence of admixtures on the relationship between permeability and pore size distribution of concrete is significant. Moreover, water permeability coefficient is one or two orders of magnitude lower than the gas permeability coefficient.

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Application of 1H NMR to hydration and porosity studies of lime–pozzolan mixtures

Cited by 26 publications

References 49 publications

Nuclear magnetic resonance cryoporometry as a tool to measure pore size distribution of shale rock

Nuclear magnetic resonance cryoporometry as a tool to measure pore size distribution of shale rock

Compressive Strength and Durability of FGD Gypsum-Based Mortars Blended with Ground Granulated Blast Furnace Slag

Permeability of Concrete and Correlation with Microstructure Parameters Determined by ¹H NMR

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Application of 1H NMR to hydration and porosity studies of lime–pozzolan mixtures

Cited by 26 publications

References 49 publications

Nuclear magnetic resonance cryoporometry as a tool to measure pore size distribution of shale rock

Nuclear magnetic resonance cryoporometry as a tool to measure pore size distribution of shale rock

Compressive Strength and Durability of FGD Gypsum-Based Mortars Blended with Ground Granulated Blast Furnace Slag

Permeability of Concrete and Correlation with Microstructure Parameters Determined by 1H NMR

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Permeability of Concrete and Correlation with Microstructure Parameters Determined by ¹H NMR