Study on the deterioration mechanism of alkali dissolution of concrete mixed with Na2SO4 in external water sources

Zhang, Zhongzhe; Ou, Geng; Ma, Zhuang; Ji, Yongsheng; Xu, Zhishan; Gao, Furong; Zhang, Jie

doi:10.1016/j.conbuildmat.2022.129283

Cited by 4 publications

(3 citation statements)

References 41 publications

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“…After 365 days in a water saturated environment, the permeability of the mortar increases, which confirms the enhancement of pore connectivity [16]. The permeability change is mainly due to the increase in MF pores, and the CBF pores and CAF pores as pore throats are further increased.…”

Section: The Permeability Variationsupporting

confidence: 56%

“…Pores with each size exhibit a distinct inner surface morphology. Therefore, in this study, three methods, namely, the spectral valley-based pore fractal calculation (F−sv method), the T2c−based pore fractal calculation (F−T2c method) [30], and the pore size-based pore fractal calcula- After 365 days in a water saturated environment, the permeability of the mortar increases, which confirms the enhancement of pore connectivity [16]. The permeability change is mainly due to the increase in MF pores, and the CBF pores and CAF pores as pore throats are further increased.…”

Section: Fractal Characteristics Of Pore Structurementioning

confidence: 55%

“…The pore structure undergoes changes under the conditions of a water saturation environment or a dry-wet cycle [1]. The hydration and calcium dissolution of mortar contribute to the changes in mortar performance [16]. In addition, the aggregate size also affects the effective waterbinder ratio involved in the hydration process in mortar [17], where the water-binder ratio primarily impacts the compactness of the spatial accumulation of hydrated calcium silicate (C-S-H) gel particles [18].…”

Section: Introductionmentioning

confidence: 99%

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Pore Structure Quantification and Fractal Characterization of MSA Mortar Based on 1H Low-Field NMR

Jiang,

He,

Tian

et al. 2024

Fractal Fract

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With the gradual depletion of natural sand due to over-exploitation, alternative building materials, such as manufactured sand aggregate (MSA), have attracted much attention. In order to interpret the evolution of pore structure and fractal characteristics in MSA mortar over long-term water saturation, the 1H low-field nuclear magnetic resonance (LF-NMR) relaxation method was used to investigate the temporal evolution of the pore structure in five single-graded MSA mortars and synthetic-graded mortars with small amplitudes in particle size. MSA presents a fresh rock interface characterized by a scarcity of pores, which significantly reduces the porosity of the mortar. The surface-to-volume ratio (SVR) is employed for characterizing the MSA gradation. Through an analysis of parameters, such as total porosity, pore gradation, pore connectivity, and pore fractal dimension of mortar, a correlation model between pore structure parameters and aggregate SVR is constructed. The fractal characteristics of pores and their variations are discussed under three kinds of pore gradations, and the correlation model between fractal dimension and porosity is established. These results demonstrate the high impermeability and outstanding corrosion resistance of synthetic-graded mortar. The fractal model of the pore structure evolution of MSA mortar has a guiding effect on the pore distribution evolution and engineering permeability evaluation of MSA mortar in engineering.

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Section: The Permeability Variationsupporting

confidence: 56%

Section: Fractal Characteristics Of Pore Structurementioning

confidence: 55%