Effects of waste plastics as partial fine-aggregate replacement for reinforced low-carbon concrete pavements

Tota-Maharaj, Kiran; Adeleke, Blessing Oluwaseun; Nounu, Ghassan

doi:10.1080/19397038.2022.2108156

Cited by 9 publications

(5 citation statements)

References 33 publications

(30 reference statements)

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“…The highest compressive strength value was obtained for Mix 9 with 30% cockle shell ash and 30% plastic coated aggregate. A similar study containing plastic sand as fine aggregate, the compressive strength properties decreased with increase in plastic sand content [15]. But, in our study the strength properties increased with increase in plastic coated sea sand content.…”

Section: Compressive Strength Testcontrasting

confidence: 65%

Utilization of Cockle Shell Ash, Sea sand and Plastic Waste in the Manufacture of Paver Blocks

Caroline James,

Athira,

Suresh

et al. 2024

E3S Web of Conf.

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The cockle shell is categorized as industrial waste and often disposed of in open dumping zones, especially in coastal areas. Therefore, an eco-friendly solution to this disposal issue is crucial, as it can transform waste into a high-value product, such as a partial cement replacement. Also, as there is a growing interest in using alternatives to sand as a replacement for fine aggregate in concrete, in this study we used plastic coated sea sand as a partial replacement for fine aggregate. The design mix is formulated for a non-traffic application, with varying percentages of cockle shell ash and plastic-coated sea sand replacing cement and fine aggregate, respectively. Two curing methods, normal water curing and accelerated curing, are applied. The samples are then tested for compression strength and water absorption after 28 days of curing. The findings indicate that compressive strength value increased with increase in both cockle shell ash content as well as plastic coated sea sand content. The water absorption value increased with increase in cockle shell ash content and decreased with increase in plastic coated sea sand content. Hence, this composite material is suitable for use in paver blocks.

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Section: Compressive Strength Testcontrasting

confidence: 65%

Utilization of Cockle Shell Ash, Sea sand and Plastic Waste in the Manufacture of Paver Blocks

Caroline James,

Athira,

Suresh

et al. 2024

E3S Web of Conf.

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“…This shows that any WP replacement of more than 70% could impact the overall workability of the concrete produced. The justification for this slump reduction could be attributed to the non-uniformity in the shape of WP, which could have improved the cohesiveness within each concrete batch mix [ 23 ]. In contrast, the 10 mm NA with a more spherical/regular shape enhances the homogeneity and fluidity of the freshly produced concrete mixes.…”

Section: Resultsmentioning

confidence: 99%

“…This effectively mobilises the toxic substances within a solid matrix and reduces the chances of releasing them into the environment [ 18 , 21 ]. Previous studies investigated the use of WP in ordinary concrete that used plastic in two forms: plastic fibres or aggregates [ 1 , 2 , 22 , 23 ]. In those instances, a complete or partial natural aggregate’s replacement with WP resulted in natural resource savings.…”

Section: Introductionmentioning

confidence: 99%

Mechanical and Microstructural Investigation of Geopolymer Concrete Incorporating Recycled Waste Plastic Aggregate

Adeleke,

Kinuthia,

Oti

et al. 2024

Materials

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The effective use of waste materials is one of the key drivers in ensuring sustainability within the construction industry. This paper investigates the viability and efficacy of sustainably incorporating a polylactic acid-type plastic (WP) as a 10 mm natural coarse aggregate (NA) replacement in geopolymer concrete. Two types of concrete (ordinary Portland cement—OPC and geopolymer) were produced for completeness using a concrete formulation ratio of 1:2:3. The ordinary concrete binder control was prepared using 100% OPC at a water/binder ratio of 0.55, while the geopolymer concrete control used an optimum alkaline activator/precursor—A/P ratio (0.5) and sodium silicate to sodium hydroxide—SS/SH volume ratio (1.2/0.8). Using the same binder quantity as the control, four concrete batches were developed by replacing 10 mm NA with WP at 30 and 70 wt% for ordinary and geopolymer concrete. The mechanical performance of the developed concrete was assessed according to their appropriate standards, while a microstructural investigation was employed after 28 days of curing to identify any morphological changes and hydrated phases. The results illustrate the viability of incorporating WP in geopolymer concrete production at up to 70 wt% replacement despite some negative impacts on concrete performance. From a mechanical perspective, geopolymer concrete indicated a 46.7–58.3% strength development superiority over ordinary concrete with or without WP. The sample composition and texture quantified using automated scanning electron microscopy indicated that adding WP reduced the presence of pores within the microstructure of both concrete types. However, this was detrimental to the ordinary concrete due to the low interfacial zone (ITZ) between calcium silicate hydrate (CSH) gel and WP, resulting in the formation of cracks.

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“…This can be advantageous in construction scenarios requiring a more fluid mixture for proper consolidation and finishing. Hence, it is essential to determine the optimal percentage of recycled plastic replacement to achieve the desired workability without exceeding the practical limits [18].…”

Section: Consistency Of Fresh Concretementioning

confidence: 99%

Strength and Durability Characterization of Structural Concrete Made of Recycled Plastic

Oti,

Adeleke,

Rathnayake

et al. 2024

Materials

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This study investigates the feasibility of utilizing recycled plastic waste as a partial substitute for sand in concrete production. Reprocessing used plastic items or materials involves collecting, cleaning, shredding, and melting, resulting in reprocessed plastic particles. Incorporating these recycled plastic particles into concrete addresses environmental concerns related to plastic disposal and the growing scarcity and increasing cost of natural sand. To evaluate the sand replacement capacity of recycled plastic, four types of mixtures were created with varying levels of recycled plastic replacement (5%, 10%, 15%, and 20%). All mixtures maintained a water-to-binding ratio of 0.55 and were tested at 7, 28, and 56 days. The testing regimen encompassed determining the slump value, density, compressive strength, tensile strength, and resistance to freezing and thawing. The findings revealed that replacing sand in the concrete mix with recycled plastic enhanced workability, which was attributed to the hydrophobic nature of the plastic particles. However, both compressive and tensile strength exhibited a declining trend. Additionally, after undergoing multiple freezing and thawing cycles, the concrete mix exhibited poor durability properties and brittleness. These issues may arise due to factors such as incompatibility, non-uniformity, reduced cohesion, and the lower density of plastic particles.

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Effects of waste plastics as partial fine-aggregate replacement for reinforced low-carbon concrete pavements

Cited by 9 publications

References 33 publications

Utilization of Cockle Shell Ash, Sea sand and Plastic Waste in the Manufacture of Paver Blocks

Utilization of Cockle Shell Ash, Sea sand and Plastic Waste in the Manufacture of Paver Blocks

Mechanical and Microstructural Investigation of Geopolymer Concrete Incorporating Recycled Waste Plastic Aggregate

Strength and Durability Characterization of Structural Concrete Made of Recycled Plastic

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