A sustainable approach to optimum utilization of used foundry sand in concrete

Rashid, Khuram; Nazir, Sana

doi:10.1515/secm-2017-0012

Cited by 8 publications

(6 citation statements)

References 12 publications

(30 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Several researchers reported findings on the reinforcement of jute fibers in concrete in order to increase the compressive, bending, and impact strengths [20][21][22]. The results reveal that the properties improve through the reinforcement of the jute fibers up to certain limit.…”

Section: Introductionmentioning

confidence: 99%

Natural Cellulosic Fiber Reinforced Concrete: Influence of Fiber Type and Loading Percentage on Mechanical and Water Absorption Performance

et al. 2022

View full text Add to dashboard Cite

The paper reports experimental research regarding the mechanical characteristics of concrete reinforced with natural cellulosic fibers like jute, sisal, sugarcane, and coconut. Each type of natural fiber, with an average of 30 mm length, was mixed with a concrete matrix in varying proportions of 0.5% to 3% mass. The tensile and compressive strength of the developed concrete samples with cellulosic fiber reinforcement gradually increased with the increasing proportion of natural cellulosic fibers up to 2%. A further increase in fiber loading fraction results in deterioration of the mechanical properties. By using jute and sisal fiber reinforcement, about 11.6% to 20.2% improvement in tensile and compressive strength, respectively, was observed compared to plain concrete, just by adding 2% of fibers in the concrete mix. Bending strength increased for the natural fiber-based concrete with up to 1.5% fiber loading. However, a decrease in bending strength was observed beyond 1.5% loading due to cracks at fiber−concrete interface. The impact performance showed gradual improvement with natural fiber loading of up to 2%. The water absorption capacity of natural cellulosic fiber reinforced concrete decreased substantially; however, it increased with the loading percent of fibers. The natural fiber reinforced concrete can be commercially used for interior or exterior pavements and flooring slabs as a sustainable construction material for the future.

show abstract

Section: Introductionmentioning

confidence: 99%

Natural Cellulosic Fiber Reinforced Concrete: Influence of Fiber Type and Loading Percentage on Mechanical and Water Absorption Performance

et al. 2022

View full text Add to dashboard Cite

show abstract

“…Sand is essential for modern society as it forms the foundation for most of the structures. Apart from construction, which comprises approximately 50% of total sand consumption (Taylor, 2019), high-tech industries such as glass, electronics, and aeronautics heavily rely on sand (Rashid & Nazir, 2018). Consequently, the demand for sand is immense, making it the most extracted material group, surpassing fossil fuel extraction (Bendixen et al, 2019;Monteiro et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

A Deep Learning framework to map riverbed sand mining budgets in large tropical deltas

Kumar,

Park,

Tran

et al. 2023

Preprint

View full text Add to dashboard Cite

Rapid urbanization has dramatically increased the demand for river sand, leading to soaring sand extraction rates that often exceed natural replenishment in many rivers globally. However, our understanding of the geomorphic and social-ecological impacts arising from Sand Mining (SM) remains limited, primarily due to insufficient data on sand extraction rates. Conventionally, bathymetry surveys and compilation of declared amounts have been used to quantify SM budgets, but they are often costly and laborious, or result in inaccurate quantification. Here, for the first time, we developed a Remote Sensing (RS)-based Deep Learning (DL) framework to map SM activities and budgets in the Vietnamese Mekong Delta (VMD), a global SM hotspot. We trained a near real-time object detection system to identify three boat classes in Sentinel-1 imagery: Barge with Crane (BC), Sand Transport Boat (STB), and other boats. Our DL model achieved a 96.1% Mean Average Precision (mAP) across all classes and 98.4% for the BC class, used in creating an SM boat density map at an Intersection over Union (IoU) threshold of 0.50. Applying this model to Sentinel-1, 256,647 boats were detected in the VMD between 2014-2022, of which 17.4% were BC. Subsequently, the annual SM budget was estimated by correlating it with a recent riverbed incision map. Our results showed that, between 2015-2022, about 366 Mm3 of sand has been extracted across the VMD. The annual budget has progressively increased from 34.92 Mm3 in 2015 to 53.25 Mm3 in 2022 (by 52%), with an annual increment of around 2.79 Mm3. At the provincial-scale, Dong Thap, An Giang, Vinh Long, Tien Giang, and Can Tho were the locations of intensive mining, accounting for 89.20% of the total extracted volume in the VMD. Finally, our estimated budgets were validated with previous research that yielded a correlation coefficient of 0.99 (percentage bias of 2.65%). The automatic DL framework developed in this study to quantify SM budgets has a high potential to be applied to other deltas worldwide also facing intensive SM.

show abstract

“…There are about 200 metal foundries in South Africa that discard around 342 000 tons of WFS annually [3]. The WFS discarded by non-ferrous casting industries is highly hazardous compared to that discarded by ferrous metal casting industries [4]. The discarded sand is a very dispersive soil due to weak Van der Waals attraction forces that causes poor soil structure [5].…”

Section: Introductionmentioning

confidence: 99%

Effect of Synthesis Conditions on Mechanical Strength of Aluminium Slag Modified Waste Foundry Sand Geopolymers

Sithole

Nkosi

2022

IOP Conf. Ser.: Earth Environ. Sci.

View full text Add to dashboard Cite

The waste foundry sand was alkaline activated into geopolymers to reduce their environmental pollution. The waste foundry sand was blended with aluminium slag and alkali activated to produce geopolymers. Aluminium slag was used to supplement WFS with alumina because as it has low content of alumina. The main parameters tested were the effect alumina content, concentration of alkali, liquid to solid ratio, and temperature. The optimum synthesis parameters were a geopolymer prepared with 2% aluminium, 3 M NaOH solution, liquid solid ratio of 0.15 and curing temperature and time of 80°C and 5 days respectively. The optimum parameters yielded the highest UCS of 4.7 MPa. The developed aluminium slag modified waste foundry sand geopolymers met the minimum requirements for ASTM C126-99 and ASTM C216-07a.

show abstract

A sustainable approach to optimum utilization of used foundry sand in concrete

Cited by 8 publications

References 12 publications

Natural Cellulosic Fiber Reinforced Concrete: Influence of Fiber Type and Loading Percentage on Mechanical and Water Absorption Performance

Natural Cellulosic Fiber Reinforced Concrete: Influence of Fiber Type and Loading Percentage on Mechanical and Water Absorption Performance

A Deep Learning framework to map riverbed sand mining budgets in large tropical deltas

Effect of Synthesis Conditions on Mechanical Strength of Aluminium Slag Modified Waste Foundry Sand Geopolymers

Contact Info

Product

Resources

About