A novel method for semi-quantitative analysis of hydration degree of cement by 1H low-field NMR

Liu, Heng; Sun, Zhenping; Yang, Jingbin; Ji, Yanliang

doi:10.1016/j.cemconres.2020.106329

Cited by 126 publications

(16 citation statements)

References 20 publications

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“…As an emerging technology, LF-NMR/MRI has been widely used in energy and geotechnical studies ( Ouyang, 2017 ; Dou, 2019 ), life sciences ( Jiang et al, 2010 ), industrial nuclear magnetic analyses ( Kirtil and Oztop, 2016 ; Hou et al, 2021 ; Liu et al, 2021 ), food ( Lin et al, 2016 ; Zhu, 2016 ; Zhu et al, 2020 ), and agriculture ( Song et al, 2018 ). The advantages associated with this method include non-destruction of samples, environmental protection, as well as rapid and highly accurate detection.…”

Section: Introductionmentioning

confidence: 99%

LF-NMR/MRI Determination of Different 6-Benzylaminopurine Concentrations and Their Effects on Soybean Moisture

Chen

Yue

et al. 2022

Front. Plant Sci.

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In this study, we aimed to clarify the distribution and dynamics of water in the Xudou 20 soybean cultivar post-germination after culturing plants with various concentrations of 6-benzylaminopurine (6-BA). Low-field nuclear magnetic resonance and magnetic resonance imaging (LF-NMR/MRI), as well as principal component analysis (PCA), were used for the investigation. Results showed that low concentrations of 6-BA promoted soybean germination and high concentrations inhibited soybean germination, with 5 mg/l of 6-BA producing the most optimal conditions for growth. Moreover, the T22 determination of weakly bound water increased with increasing 6-BA concentration, and the PCA effectively distinguished soybeans cultured at different 6-BA concentrations. This study provides a method for the rapid detection of 6-BA concentration in bean sprouts and provides theoretical support and bean sprout quality assessment.

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Section: Introductionmentioning

confidence: 99%

LF-NMR/MRI Determination of Different 6-Benzylaminopurine Concentrations and Their Effects on Soybean Moisture

Chen

Yue

et al. 2022

Front. Plant Sci.

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“…Capillary pores are the pores left by the evaporation of water between cement particles, and the pores are connected by a network structure. The higher curing temperature indicates higher degree of hydration, 35 smaller porosity, denser sample, and therefore, higher strength. At the same time, the formation of calcium hydroxide reduces the pore volume and improves the strength of the sample.…”

Section: Discussionmentioning

confidence: 99%

“…Pichler et al 6 studied the uniaxial compressive strength and hydration degree of concrete samples at different curing temperatures (15-70 C) and used a power law function to characterize the relationship between hydration degree and strength. Xiu et al 7 studied the effects of different curing temperatures (20,35, and 45 C) on the triaxial mechanical properties of cement-based tailing backfilling. The peak deviator stress and cohesion increase as the curing temperature rises, whereas the internal friction angle decreases.…”

Section: Introductionmentioning

confidence: 99%

Triaxial tests on high ductile concrete under different environmental conditions

Shi

Yan

Kou

2022

Structural Concrete

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Triaxial compression tests were conducted on high ductile concrete (HDC) under three curing conditions to study its triaxial mechanical properties under different curing environments. The three different curing conditions are as follows: standard curing (temperature 20 ± 2°C, humidity ≥95%), water curing (temperature 15 ± 2°C, humidity ≥95%), and −20°C (−20 ± 2°C, humidity ≥85%). The variation laws of stress–strain response, peak stress, peak strain, and volume strain were analyzed for HDC under different environmental conditions. The mechanism of the effect of HDC mesostructure on strength under different curing conditions was revealed using ultrasonic and nuclear magnetic resonance detection technology. The relationship between HDC uniaxial compressive strength and ultrasonic speed was obtained by fitting the test data, and the relationship between the shear strength and temperature was provided. Results show that the peak stress of HDC under the same confining pressure increases with the rise in the curing temperature. The peak strain also decreases, and the HDC exhibits better ductility under −20°C curing. The peak stress and peak strain of HDC under the same curing conditions increase with the rise in confining pressure. HDC specimen fracture is in the composite failure mode of shear and splitting, and it cracks but does not disintegrate. The pore size is larger and the strength is lower when the pores are more harmful.

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“…It can be seen that the T 2 distributions of the two mixtures mainly fall in 0.1-100 ms, which corresponds to the signal of capillary water (Liu et al, 2021). The initial single peak at T 2 of 0.1-10 ms shifts left from 1 day to 7 days, which indicates that the pore structure is dense due to the continuous production of hydration products (Jiang et al, Frontiers in Built Environment frontiersin.org 2021; Liu et al, 2021). With increasing hydration time, the intensity of the T 2 peak dropped, implying that free water was continuously consumed and transformed into chemicalbound water.…”

Section: Relaxation Distribution and Liquid Statusmentioning

confidence: 97%

“…The transverse relaxation time (T 2 ) of control and RSP4.2 paste is shown in Figure 7. It can be seen that the T 2 distributions of the two mixtures mainly fall in 0.1-100 ms, which corresponds to the signal of capillary water (Liu et al, 2021). The initial single peak at T 2 of 0.1-10 ms shifts left from 1 day to 7 days, which indicates that the pore structure is dense due to the continuous production of hydration products (Jiang et al, Frontiers in Built Environment frontiersin.org 2021; Liu et al, 2021).…”

Section: Relaxation Distribution and Liquid Statusmentioning

confidence: 99%

Effect of rice straw powder on properties of one-part alkali-activated slag

Yin

Jiang

Wang

et al. 2022

Front. Built Environ.

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One-part alkali-activated slag (AAS) as a binder material has a promising application in the construction industry. The properties of one-part AAS incorporating agricultural wastes have been seldom studied. In this paper, the fresh and hardened properties of one-part AAS with the addition of rice straw powder (RSP) were investigated. The reaction rate in the acceleration period of AAS is reduced by RSP. The compressive strength of the mixture decreases with the introduction of RSP, while the flexural strength increases. The porosity of the hardened mixtures becomes lower when RSP was incorporated. N-(C)-A-S-H gel was detected in the system when 4.2% RSP was present. The RSP reduces the early-age autogenous shrinkage of AAS by providing internal curing to the matrix, but its effect on long-term drying shrinkage is limited.

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A novel method for semi-quantitative analysis of hydration degree of cement by 1H low-field NMR

Cited by 126 publications

References 20 publications

LF-NMR/MRI Determination of Different 6-Benzylaminopurine Concentrations and Their Effects on Soybean Moisture

LF-NMR/MRI Determination of Different 6-Benzylaminopurine Concentrations and Their Effects on Soybean Moisture

Triaxial tests on high ductile concrete under different environmental conditions

Effect of rice straw powder on properties of one-part alkali-activated slag

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