Clarifying the effects of volume proportion and surface area of aggregate on chloride diffusivity of concrete through microstructural design

Li, Jiahao; Guo, Yiqun; Zhang, Tongsheng; Gao, Peng; Wu, Juan; Ren, Qiang; Wei, Jiangxiong; Yu, Qijun

doi:10.1016/j.cemconcomp.2023.105248

Cited by 4 publications

(1 citation statement)

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“…It can be seen that in the process of mortar service to 365 d, the effect of the initial water saturation environment on mortar is mainly to enhance the hydration of mortar. With the continuous saturation time, the unhydrated mortar will be completely hydrated [18], which leads to the densification of the C-S-H structure, and the cumulative hydraulic erosion of mortar will increase, and the mortar with large aggregate SVR is more strongly affected by hydraulic erosion [49].…”

Section: The Permeability Variationmentioning

confidence: 99%

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 Variationmentioning

confidence: 99%