Volume and surface fractal dimensions of pore structure by NAD and LT-DSC in calcium sulfoaluminate cement pastes

Tang, Shengwen; He, Zhen; Cai, Xinhua; Cai, Rongjin; Zhou, Wei; Li, Zhengjun; Shao, Hongyu; Wu, Tao; Chen, E.

doi:10.1016/j.conbuildmat.2017.03.140

Cited by 64 publications

(31 citation statements)

References 37 publications

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“…Fractal models based on the mercury intrusion method are widely used to characterize the fractal features of cement-based materials, because the MIP technique provides the unique benefit of covering a relatively wide range of pore size [21][22][23]36 . These models include the space-filling model, Menger sponge model, and fractal model 21,23,24 .…”

Section: Methodology Of the Fractal Dimension Calculationmentioning

confidence: 99%

“…In addition, concrete is a typical porous material and possesses obvious fractal characteristics in pore shape, pore area and pore volume [20][21][22] . According to the fractal theory, the fractal dimension is an important parameter to characterize the complexity and inhomogeneity of the pores in concrete [21][22][23][24][25] . Some studies have addressed on the relationship between the mechanical property, durability, and fractal dimension of concrete.…”

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confidence: 99%

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Effects of Fineness and Content of Phosphorus Slag on Cement Hydration, Permeability, Pore Structure and Fractal Dimension of Concrete

et al. 2021

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The utilization of phosphorus slag (PHS) to replace the fly ash in the construction of hydraulic projects has attracted a growing attention in China. In this study, the influence of PHS fineness and content on cement hydration, mechanical strength, permeability as well as the pore structure and fractal dimension (Ds) of concrete have been discussed. The results indicate that the PHS addition retards the cement hydration and hence decreases the hydration heat within 3 days. The incorporation of PHS with a Blaine specific surface area of 505 m 2 /kg (PHS) could participate in the early pozzolanic reaction and consequently offsets the retarding effect to some extent. The incorporation of 20-40 w% PHS declines the early strength of concrete, but this reduction effect on strength can be eliminated to some degrees by mechanically grinding the PHS. The compressive strengths of concrete added with PHS with a high fineness of 505 m 2 /kg

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Section: Methodology Of the Fractal Dimension Calculationmentioning

confidence: 99%

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confidence: 99%

Effects of Fineness and Content of Phosphorus Slag on Cement Hydration, Permeability, Pore Structure and Fractal Dimension of Concrete

et al. 2021

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“…The pore structure of concrete can be considered as a fractal object 23,[30][31][32] . According to the fractal theory, the complexity and heterogeneity of the pore structure in concrete can be described and characterized by a fractal dimension 23,31,33,34 .…”

Section: Introductionmentioning

confidence: 99%

Comparison of Fly Ash, Pva Fiber, Mgo and Shrinkage-Reducing Admixture on the Frost Resistance of Face Slab Concrete via Pore Structural and Fractal Analysis

et al. 2021

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Face slab concrete suffers from serious frost damage in cold regions in China, how to improve the frost resistance of face slab concrete in cold regions is one of the important issues in concrete faced rockfill dam (CFRD) design and construction. The results in this paper indicate that the frost resistance of concrete can be improved by adding fly ash, fiber, MgO and shrinkage-reducing admixtures (SRA), and the efficiency is in the sequence: (fly ash + fiber) > fiber > fly ash > MgO > SRA. The incorporation of 0.8 kg/m 3 PVA fiber and 20 wt% fly ash together enhances the compressive strength and tensile capacity of concrete by 6-7 % at late age, whereas the addition of 6 wt% MgO or 1 wt% SRA reduces the compressive strength and tensile capacity by about 4-10 % at various ages. The Ds of concrete added with fly ash, fiber, MgO and SRA is within the range of 2.619-2.796. The frost resistance of concrete correlates linearly with the air void parameters, pore structures and Ds. The utilization of fly ash and/or PVA fiber refines and optimizes the pore structure, thus increasing Ds and improving the frost resistance. On the contrary, MgO and SRA in this study are less effective in refining the pores than PVA fiber and fly ash, thereby producing smaller Ds and relatively weaker frost resistance.

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“…There is a consensus that the mechanical and durability properties of concrete are closely related with its pore structure such as the porosity and the pore size distribution [26][27][28] . It has been suggested that the pore structure of concrete presents fractal characteristics within certain scales 24,26,29,30 . Fractal dimension, which is an index derives from the fractal theory, is progressively employed to characterize the complexity and irregularity(pore size distribution) of the pore structure and macroproperties of concrete 25,27,29,31 .…”

Section: Introductionmentioning

confidence: 99%

“…It has been suggested that the pore structure of concrete presents fractal characteristics within certain scales 24,26,29,30 . Fractal dimension, which is an index derives from the fractal theory, is progressively employed to characterize the complexity and irregularity(pore size distribution) of the pore structure and macroproperties of concrete 25,27,29,31 . For instance, Zarnaghi et al 25 , Qing et al 27 and Jin et al 31 , found the linear relationship exists between the strength of concretes and their fractal dimensions.…”

Section: Introductionmentioning

confidence: 99%

Pore Structural and Fractal Analysis of the Influence of Fly Ash and Silica Fume on the Mechanical Property and Abrasion Resistance of Concrete

et al. 2021

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Dam concrete suffers from serious abrasion damages in southwestern China, the abrasion resistance of concrete is therefore one of the most important factors determining the reliability even the safety of the dams. In the present work, the effects of fly and/or silica fume on the mechanical properties, drying shrinkage, as well the cracking and abrasion resistance of concrete were investigated, then the pore structures of concrete added with fly ash and silica fume and the pore surface fractal dimensions (Ds) were determined by the mercury intrusion porosimetry (MIP) method and a fractal model, respectively. Finally, the relationships between the abrasion resistance of concrete and the porosity as well as the Ds were revealed and discussed. The results indicate that silica fume significantly increases the drying shrinkage especially at early age, while the incorporation of fly ash and silica fume together can decease the early plastic shrinkage-induced cracking risk and the final shrinkage to some degrees. Besides, the utilization of 5 wt% silica fume and 20 wt% fly ash together increases the abrasion resistance and mechanical property by about 4-9 % at various ages. In addition, the compressive strength and the abrasion resistance of concrete are linearly correlated with the concrete porosity and the Ds. Both the fly ash and silica fume could decrease the porosity of concrete and increase the Ds, therefore the concrete containing fly ash

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Volume and surface fractal dimensions of pore structure by NAD and LT-DSC in calcium sulfoaluminate cement pastes

Cited by 64 publications

References 37 publications

Effects of Fineness and Content of Phosphorus Slag on Cement Hydration, Permeability, Pore Structure and Fractal Dimension of Concrete

Effects of Fineness and Content of Phosphorus Slag on Cement Hydration, Permeability, Pore Structure and Fractal Dimension of Concrete

Comparison of Fly Ash, Pva Fiber, Mgo and Shrinkage-Reducing Admixture on the Frost Resistance of Face Slab Concrete via Pore Structural and Fractal Analysis

Pore Structural and Fractal Analysis of the Influence of Fly Ash and Silica Fume on the Mechanical Property and Abrasion Resistance of Concrete

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