Potential Effect of Porosity Evolution of Cemented Paste Backfill on Selective Solidification of Heavy Metal Ions

Yang, Yintang; Zhao, Ting; Jiao, Huazhe; Wang, Yunfei; Li, Haiyan

doi:10.3390/ijerph17030814

Cited by 33 publications

(12 citation statements)

References 41 publications

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“…is result caused the increase of pore connectivity and permeability of the ordinary pavement concrete due to climate and load effects, which led to the ability of pore structure to resist the penetration of external forces decreasing, thus making the overall working performance decline [30][31][32][33][34][35].…”

Section: Durabilitymentioning

confidence: 99%

Experimental Research on Durability of Fly Ash Pavement Concrete and Mix Proportion Optimization

Zhai

Tang

Chen

et al. 2021

Advances in Materials Science and Engineering

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This paper focused on the optimization of the C40 fly ash concrete pavement, which was considered as a measure to accelerate the consumption of industrial solid wastes such as fly ash, committing to the goal of zero waste. By comparing with three groups of ordinary mix proportion, the performances (e.g., mechanical properties, durability, and brittle property) of the optimized mix proportion were evaluated via multiple mechanical and physical tests. Their air voids’ structure was characterized by the BJH method (a method to calculate pore size described by Barrett, Joyner, and Halenda), and the results were combined with the road performances of concrete to analyze the formation mechanism of high durability of optimized fly ash pavement concrete. As for the experimental results for the optimized, its 28 d compressive strength peaked at 50.8 MPa together with corresponding 28 d flexural strength at 8.2 MPa, which indicated a favorable mechanical performance for wide application in pavement construction. Except for the mechanical properties, the better durability indicators obtained after optimization also provided a more compact pore structure for the optimized. The raw materials and construction technology of the two kinds of pavements were compared. Promoting the use of optimized fly ash pavement concrete can break the situation of the asphalt pavement monopolizing heavy-haul highway and greatly reduce the industrial wastes which can be used as raw materials in the production of cement, such as blast furnace slag and fly ash. It was proved that the optimized fly ash concrete pavement can be used to replace the asphalt pavement under the premise of achieving the same working performances.

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Section: Durabilitymentioning

confidence: 99%

Experimental Research on Durability of Fly Ash Pavement Concrete and Mix Proportion Optimization

Zhai

Tang

Chen

et al. 2021

Advances in Materials Science and Engineering

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“…Asia (China, India), Western Europe, and North America have become the three largest nitrogen deposition concentration areas [ 8 ]. The significant increase in AND leads to the acidification, eutrophication, and biodiversity reduction in soil, water and ecosystems [ 9 ], which seriously threatens the water and terrestrial ecosystems [ 10 ]. At the beginning of 2020, the tropospheric NO 2 column in eastern China decreased by 65% compared with the same period in 2019, mainly caused by the change of fossil fuel combustion after the epidemic response period [ 11 ].…”

Section: Introductionmentioning

confidence: 99%

Atmospheric Organic Nitrogen Deposition in Strategic Water Sources of China after COVID-19 Lockdown

Yang

Zhao

Jiao

et al. 2022

IJERPH

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Atmospheric nitrogen deposition (AND) may lead to water acidification and eutrophication. In the five months after December 2019, China took strict isolation and COVID-19 prevention measures, thereby causing lockdowns for approximately 1.4 billion people. The Danjiangkou Reservoir refers to the water source in the middle route of South-to-North Water Diversion Project in China, where the AND has increased significantly; thus, the human activities during the COVID-19 period is a unique case to study the influence of AND to water quality. This work monitored the AND distribution around the Danjiangkou Reservoir, including agricultural, urban, traffic, yard, and forest areas. After lockdown, the DTN, DON, and Urea-N were 1.99 kg · hm−2 · month−1, 0.80 kg · hm−2 · month−1, and 0.15 kg · hm−2 · month−1, respectively. The detected values for DTN, DON, and Urea-N in the lockdown period decreased by 9.6%, 30.4%, and 28.97%, respectively, compared to 2019. The reduction in human activities is the reason for the decrease. The urban travel intensity in Nanyang city reduced from 6 to 1 during the lockdown period; the 3 million population which should normally travel out from city were in isolation at home before May. The fertilization action to wheat and orange were also delayed.

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“…However, in the early development of this technology, only two-dimensional CT images could be obtained after CT scanning the concrete, and the relevant information was recorded and saved in the digital form on a computer. In recent years, with the improvement of computer processing ability, the use of a computer can realize the commands of CT image denoising, filtering, image segmentation, so as to build a three-dimensional model of concrete, which is called digital image processing technology [21][22][23][24]. At present, there is a variety of research on the processing of CT scanning images of fiber reinforced concrete with digital image processing technology, but there is little research on the microstructure of basalt fiber reinforced concrete with this technology [25].…”

Section: Introductionmentioning

confidence: 99%

Characterization of Internal Defects and Fiber Distribution of BFRC Based on the Digital Image Processing Technology

Chen

Jiao

et al. 2021

Crystals

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Adding basalt fiber into concrete can significantly improve its mechanical properties. In order to explore the influence of basalt fiber content on the uniaxial compressive strength and splitting tensile strength of concrete and the mechanism of fiber action, this paper conducts compressive and splitting tensile tests on three kinds of basalt fiber concrete specimens with different fiber content and obtains the relationship between the macro mechanical properties and the fiber content. At the same time, with the help of CT scanning equipment and digital image processing technology, the microstructure of basalt fiber concrete with three groups of fiber content is reconstructed, and the pore, crack, and fiber distribution are quantitatively described using the calculation and processing function of the Avizo reconstruction software. The results show that when the optimal fiber content is 3 kg/m3, the improvement rates of uniaxial compressive strength and splitting tensile strength are 31.9% and 23.7%, respectively. The network structure formed by fiber in concrete has the best compactness and the least number of pores, with an average sphericity of 0.89 and an average pore volume of 20.26 μm3. Through analysis, it was found that the initial defects of basalt fiber concrete exist in the form of pores, and the addition of basalt fiber will destroy the large pore size of concrete, change the pore size distribution, and increase the average sphericity; The distribution of the fiber in the concrete is a three-dimensional network, and the distribution of the fiber in the initial defect distribution area is parallel to the direction of pore arrangement.

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Potential Effect of Porosity Evolution of Cemented Paste Backfill on Selective Solidification of Heavy Metal Ions

Cited by 33 publications

References 41 publications

Experimental Research on Durability of Fly Ash Pavement Concrete and Mix Proportion Optimization

Experimental Research on Durability of Fly Ash Pavement Concrete and Mix Proportion Optimization

Atmospheric Organic Nitrogen Deposition in Strategic Water Sources of China after COVID-19 Lockdown

Characterization of Internal Defects and Fiber Distribution of BFRC Based on the Digital Image Processing Technology

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