Numerical study on seepage flow in pervious concrete based on 3D CT imaging

Zhang, Jiong; Ma, Guodong; Ming, Ruiping; Cui, Xinzhuang; Li, Li; Xu, Huining

doi:10.1016/j.conbuildmat.2017.11.149

Cited by 122 publications

(29 citation statements)

References 14 publications

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“…The maximum sphere search algorithm assumes that the pixels contained in any two adjacent largest spheres will not completely coincide. The concept of the upper and lower radius limits is introduced [37]. R 2 LEFT represents the square of the lower radius limit, and R 2 RIGHT represents the square of the upper limit, while…”

Section: Pore Separation Theorymentioning

confidence: 99%

Pore Connectivity and Dewatering Mechanism of Tailings Bed in Raking Deep-Cone Thickener Process

et al. 2020

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Paste and thickened tailings (PTT) technology can improve the utilization and management of tailings from processing plants. The pore size distribution (PSD) and microstructure evolution affected by the rake shear in thickening tailings beds are essential to produce a high-density tailings underflow. Continuous thickening and computed tomography (CT) scanning tests were conducted to study the PSD with and without shear. The pore morphology was studied to reveal the shearing-dewatering performance of the tailings bed. The results show that at a flocculant solution concentration of 0.01 wt % and a feed slurry concentration of 10 wt%, the underflow concentration with and without shear can reach 58.5 wt %and 55.8 wt %, respectively. The CT image reconstruction models demonstrated that the porosity of the sheared tailings bed increased with the bed height. When the bed height increased from 2.5 to 10 cm, the porosity increased from 35.1% to 41.9%, the pore fractal dimension increased from the range 1.8–1.95 to the range 2.1–2.15, and the pore quantity decreased by 21.39%. The average pore volume increased with increasing height by 13.93%, 16.57% and 12.07%. The pore structure became more complex with the bed height, and the connectivity between pores increased to form water-flow channels, which were beneficial to the drainage of sealed water.

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Section: Pore Separation Theorymentioning

confidence: 99%

Pore Connectivity and Dewatering Mechanism of Tailings Bed in Raking Deep-Cone Thickener Process

et al. 2020

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“…The mechanical performance of PC may be assessed in terms of the pre-cracking and post-cracking strength in tension and compression using either FEM or DEM. The DEM is the most commonly found in the literature [39,40] and account for two types of particle interactions: cohesive and non-cohesive. The latter is associated to the bond between cement paste and aggregates (might involve a degree of damage depending on the load level), whereas the latter represents a fully damaged contact or new interactions between particles not initially in contact.…”

Section: Pervious Concretementioning

confidence: 99%

Holistic modelling approach for special concrete: from fresh- to hardened-state

2019

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In the construction industry, the design of dimensions and material properties is generally separated from the design of material composition and of the production processes used. Such divide is enabled by robust construction materials (like concrete) little affected by production processes if minimum precautionary measures are in place. The same does not hold true for special concrete types; whose higher sensibility compels a shift towards more comprehensive approaches that assimilate the production process in a holistic design. The design driven by integrated numerical simulations encompassing from production to the long-term performance is already ordinary in the manufacturing of plastic and metallic parts. Nevertheless, it remains an alien to the construction industry. The objective of this paper is to review existing studies that might underpin this holistic design approach in construction and show some of its capabilities. Advanced modelling strategies available to simulate the behaviour from the fresh- to the hardened-state are discussed for the cases of pervious concrete and fibre reinforced concrete. This approach provides a deeper insight about the material behaviour and aids to a new level of numerical optimisation of their compositions and production processes, unlocking a potential transformation of the modus operandi of the construction industry.

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“…However, the difference between the porosity and 2D pore ratio obtained from the image processing should be considered. Similarly, X-ray computed tomography (X-ray CT) is also available for pore structure analysis based on a 3D tomographic image of a sample [36,37]. Because X-ray CT analysis scans the entire testing specimen and virtually reconstructs actual pore structures, this method can provide information about the internal pore microstructure, 3D pore ratio, pore size, and their spatial distribution [38,39].…”

Section: Introductionmentioning

confidence: 99%

Characterization of Porous Cementitious Materials Using Microscopic Image Processing and X-ray CT Analysis

et al. 2020

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The use of lightweight concrete has continuously increased because it has a primary benefit of reducing dead load in a concrete infrastructure. Various properties of lightweight concrete, such as compressive strength, elastic modulus, sound absorption performance, and thermal insulation, are highly related to its pore characteristics. Consequently, the identification of the characteristics of its pores is an important task. This study performs a comparative analysis for characterizing the pores in cementitious materials using three different testing methods: a water absorption test, microscopic image processing, and X-ray computed tomography (X-ray CT) analysis. For all 12 porous cementitious materials, conventional water absorption test was conducted to obtain their water permeable porosities. Using the microscopic image processing method, various characteristics of pores were identified in terms of the 2D pore ratio (i.e., ratio of pore area to total surface area), the pore size, and the number of pores in the cross-sectional area. The 3D tomographic image-based X-ray CT analysis was conducted for the selected samples to show the 3D pore ratio (i.e., ratio of pore volume to total volume), the pore size, the spatial distribution of pores along the height direction of specimen, and open and closed pores. Based on the experimental results, the relationships of oven-dried density with these porosities were identified. Research findings revealed that the complementary use of these testing methods is beneficial for analyzing the characteristics of pores in cementitious materials.

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Numerical study on seepage flow in pervious concrete based on 3D CT imaging

Cited by 122 publications

References 14 publications

Pore Connectivity and Dewatering Mechanism of Tailings Bed in Raking Deep-Cone Thickener Process

Pore Connectivity and Dewatering Mechanism of Tailings Bed in Raking Deep-Cone Thickener Process

Holistic modelling approach for special concrete: from fresh- to hardened-state

Characterization of Porous Cementitious Materials Using Microscopic Image Processing and X-ray CT Analysis

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