Directional-dependence in the mechanical characteristics of sand: a review

Al-Rkaby, Alaa H. J.; Chegenizadeh, Amin; Nikraz, Hamid

doi:10.1080/19386362.2016.1173965

Cited by 28 publications

(7 citation statements)

References 85 publications

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“…The students indicated as very confident are much higher than students mentioned less confident or not confident in flipped course. This outcome also was checked in research items and comprehension of students tested against some of those [16][17][18][19][20][21][22][23], the students feedback was encouraging and further supports flipped classroom usage. In writing of this report some of the ideas was taken from [24,25].…”

Section: Confidence Resultsmentioning

confidence: 99%

Efficacy of a Flipped-Classroom on Learning and Confidence of Engineering Students

Chegenizadeh¹

2020

IJATCSE

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A flipped classroom is a type of blended learning (BL) that students learn the materials at their own time and by attending at a physical classroom. This method helps learners to learn the materials at their own time and reinforce their learnings in a classroom. This study interrogates efficacy of a flipped-classroom in comparison with traditional teaching method on students learning and confidence in a geotechnical engineering unit at Curtin University, Perth Western Australia. To do so, an experimental investigation was performed on students enrolled in a semester-long geotechnical unit and they have options of flipped model or a conventional model classroom for their learning. To score students' performance against learning and confidence, a Likert scale was employed to rate students level of confidence by introducing a 20-items knowledge assessment on five topics before and after each learning. The results showed that students attended in a flipped-classroom gained higher scores in comparison with the students attended in conventional teaching course. For confidence rating, the traditional course students ranked a lower confidence than the flipped group for all assessed modules.

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Section: Confidence Resultsmentioning

confidence: 99%

Efficacy of a Flipped-Classroom on Learning and Confidence of Engineering Students

Chegenizadeh¹

2020

IJATCSE

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“…With the growing importance of geotechnical and pavement issues, research in these areas took the momentum to solve recycle materials inclusion in civil engineering projects. The application of numerical tools [1] and laboratory testing [2][3][4][5][6][7][8] on the aggregate issues are well-documented. On the other hand, waste creation is increasing day by day.…”

Section: Introductionmentioning

confidence: 99%

A Comparison on Physical and Rheological Properties of Three Different Waste Plastic-Modified Bitumen

2022

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This study aims to investigate the effect and the possibility of using waste plastic as a sustainable cost-effective polymer to modify bitumen binders. Different types of waste plastic have been used in this modification, including polyethylene terephthalate (PET), high-density polyethylene (HDPE), and low-density polyethylene (LDPE). The modification targets the physical characteristics, rheological properties, and binders’ resistance to ageing. Both long- and short-term ageing are investigated to determine the durability and ageing resistance of the modified binder using rolling thin film oven tests (RTFOT) and pressure ageing vessels (PAVs). Penetration tests and dynamic shear rheometer (DSR) tests were conducted to investigate and evaluate the complex shear modulus, stiffness, elasticity, and viscous properties. The results show that 2% and 4% of HDPE and LDPE are recommended as ideal contents for good performance, as reflected by the penetration tests before and after ageing. However, higher contents, such as 6% and 8% HDPE and LDPE, are not significant in improving the stiffness, elasticity, and ageing resistance. Therefore, samples of 6–8% HDPE and LDPE are more vulnerable to permanent deformation. Furthermore, using waste PET exhibits obvious improvements in terms of the physical characteristics, rheological properties, stiffness, elasticity, and ageing resistance with up to 8% PET-modified bitumen. Based on the results, the ideal type and content is 6–8% PET waste plastic.

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“…The mechanical behaviour of soil can be improved using addition of additives. Previous studies showed that characteristics of soils such as shear strength, compaction, compressibility, and permeability can be improved using additives such as fibre, fly ash, and slag [1][2][3][4][5][6][7][8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Mechanical Behaviour of Atrazine-Contaminated Clay

Keramatikerman¹,

Chegenizadeh

Nikraz

et al. 2020

Applied Sciences

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Atrazine (ATZ) is one of the most heavily used types of herbicide that is currently applied in the agricultural industry all around the world, especially Australia and the United States. This study investigates the effect of atrazine contamination on the mechanical characteristics of two Western Australian natural clays and one commercial type of clay. A series of the Atterberg limit, compaction, and torsional ring shear tests were performed on the clays contaminated with 2, 4, and 6% atrazine content. The results showed that increasing the atrazine content led to a reduction in both liquid limit (LL) and plastic (PL) of the tested soils. Similarly, the optimum moisture content (OMC) and maximum dry density (MDD) decreased by increasing the atrazine in all tested clays. The ring shear results showed that the peak shear strength and residual stress ratio of the clays decreased by increasing the contamination. Also, the results showed that atrazine contamination caused an increase in cohesion and a decrease in the friction angle of the tested soils. Also, longer periods of contamination caused a reduction in strength characteristics of the tested soils.

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Directional-dependence in the mechanical characteristics of sand: a review

Cited by 28 publications

References 85 publications

Efficacy of a Flipped-Classroom on Learning and Confidence of Engineering Students

Efficacy of a Flipped-Classroom on Learning and Confidence of Engineering Students

A Comparison on Physical and Rheological Properties of Three Different Waste Plastic-Modified Bitumen

Mechanical Behaviour of Atrazine-Contaminated Clay

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