Triaxial mechanical properties and microstructure visualization of BFRC

Chen, Fengbin; Xu, Bin; Jiao, Huazhe; Chen, Xinming; Shi, Yan; Wang, Jinxing; Li, Zhen

doi:10.1016/j.conbuildmat.2021.122275

Cited by 34 publications

(14 citation statements)

References 39 publications

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“…Solid waste and air pollution are important sources of pollution caused by human activities to the natural environment [ 1 , 2 , 3 ]. Human activities have an important impact on atmospheric nitrogen deposition (AND).…”

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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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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“…At present, scholars in China and abroad have carried out a series of studies on nitrogen deposition flux, deposition characteristics and ecological effects. Among them, the research on terrestrial ecosystem is mainly focused on forests [ 3 ], grasslands [ 4 ], farmland [ 5 ], regions [ 6 ] and cities [ 7 ], and the research on nitrogen deposition in water is mainly focused on oceans [ 8 ], lakes [ 9 , 10 ] and swamps [ 11 ]. At present, most studies focus on inorganic nitrogen and ignore organic nitrogen, which leads to the general underestimation of the total flux of nitrogen deposition, resulting in the underestimation of the risk of nitrogen deposition in the ecosystem [ 12 ].…”

Section: Introductionmentioning

confidence: 99%

Types and Distribution of Organic Amines in Organic Nitrogen Deposition in Strategic Water Sources

Yang

Zhao

Jiao

et al. 2022

IJERPH

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Organic nitrogen (ON) is an important part of atmospheric nitrogen deposition, but the content and distribution of components other than urea and amino acids are the blind area of current research. The deposition of organic amines (OA) in strategic water sources poses a great public health risk to unspecified populations. In order to further reveal the composition of about 50% soluble organic nitrogen, besides urea and amino acids, five functional sampling points (such as industrial area, agricultural area, urban area, tourism area and forest area) were set in the reservoir area to detect dissolved total nitrogen (DTN), dissolved organic nitrogen (DON) and OA components. The results show that the total nitrogen concentration was 6.42–10.82 mg/m3 and the DON concentration was 2.77–4.99 mg/m3. Ten kinds of OA were detected: dimethylamine (DMA), diethylamine (DEA), propylamine (PA), butylamine (BA), pyrrolidine (PYR), dibutylamine (DBA), N-methylaniline (NMA), 2-ethylaniline (2-ELA), benzylamine (BMA), and 4-ethylaniline (4-ELA). The average concentrations were 7.64, 26.35, 14.51, 14.10, 18.55, 7.92, 10.56, 12.84, 13.46 and 21.00 ng/m3, respectively. The total concentration of ten OA accounted for 2.28–9.81% of DON in the current month, of which the content of DEA was the highest, reaching 0.71%, the content of 4-ELA, PYR, PA and BA was 0.4–0.56%, and the content of DMA, DBA and NMA was 0.2–0.36%. The sources of OA in the reservoir area have significant seasonal differences. The content is the highest in spring, followed by autumn, and lower in summer and winter. The rainfall in spring and autumn is small, the source of road dust is relatively high, and the rainfall in summer is large. After the particles in the air are washed by rain, the concentration of OA in the sample is the lowest. On account of spring and autumn being the time of frequent agricultural activities, the concentration of OA is significantly higher than that in winter and summer.

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“…In recent years, the macroscopic aspects of adding fiber to concrete has been subject to studies that document great increases in compression strength. Chen et al [12] studied six groups of BFRC with different fiber dosages and found that the addition of fiber improve the mechanical properties of concrete. Li [13] obtained a series of continuous slice images via the non-destructive scanning of loess with industrial CT, studied the preferential seepage channel characteristics of micro-scale loess, and studied the flow characteristics of loess.…”

Section: Introductionmentioning

confidence: 99%

Quantifying Computed Tomography of Basalt Fiber-Reinforced Concrete under Unconfined Compression

et al. 2022

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The macroscopic aspects of adding basalt fiber (BF) to concrete has been the subject of studies that document great increases in compression strength. Research into the microscopic aspects of the reinforcement mechanism is still in an exploratory stage, and the quantitative analysis and visual observation of fibers in the concrete matrix are difficult. In this paper, the reinforcement effect of fiber on concrete is studied by means of computed tomography (CT) scanning technology and digital image processing (DIP) technology, combined with the macro-mechanical properties obtained from the unconfined compression strength test, and quantitative analysis from the micro point of view. At the same time, the fiber visualization is realized with the help of Avizo. The results show that with the increase in fiber dosage, the peak stress of concrete first increases and then decreases. When the fiber dosage is 3 kg/m3, the peak stress is 44.4 MPa, which is 41.85% higher than that of ordinary concrete. Additionally, the proportion of macropores is the least, which is the best fiber dosage. It is found that when the fiber dosage is 3 kg/m3, the angular distribution of φ is relatively uniform, and the uniform distribution of fibers forms a dense network structure, which significantly increases the peak stress of concrete. However, when the fiber dosage is too high, it will lead to the accumulation of fibers and produce macropores, and these excess fibers mainly appear in the horizontal direction and do not contribute to the compression strength.

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Triaxial mechanical properties and microstructure visualization of BFRC

Cited by 34 publications

References 39 publications

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

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

Types and Distribution of Organic Amines in Organic Nitrogen Deposition in Strategic Water Sources

Quantifying Computed Tomography of Basalt Fiber-Reinforced Concrete under Unconfined Compression

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