Cementitious eco-composites and their physicochemical/mechanical properties in Portland cement-based mortars with a lightweight aggregate manufactured by upcycling waste by-products

Górak, Piotr; Postawa, P.; Trusilewicz, Lidia Natalia; Kalwik, A.

doi:10.1016/j.jclepro.2020.125156

“…Similarly, recycling and use of construction waste as substitute for aggregates has reached its attention in recent times (Kirthika et al 2020). Several biomass energies have been used as substitute for cement, a considerable portion, fi ne aggregates, and reinforcement components in concrete (Górak et al 2021). However, an assessment integrating numerous factors is required to determine if recycled aggregate concrete production should be prioritized over normal aggregate concrete production.…”

Section: Requirement For Alternative Fine Recycled Concrete Aggregatementioning

confidence: 99%

Review on Impact of Construction Waste Landfill on Environment and its Reutilization

Sivamani¹,

Kamaleshwar²

2022

Ecol. Eng. Environ. Technol.

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In several countries, the use of recycled coarse aggregate in construction materials is recommended; however, the use of organic matter is restricted because it can produce significant changes in compressive strength. In terms of reaching a conclusive viewpoint regarding the research topic, secondary data collection analysis has been selected. It is essential to utilize the recycled and by-products wastages to prepare alternative materials as this can be useful in generating a significant amount of fine concrete aggregate. As a result, it reduces the extreme exploration of essential natural resources and meets the requirements of natural concrete aggregates by using the alternative and recycled fine concrete aggregate. Moreover, the alternative materials come with similar properties and physical behaviour as they sustain the durability and compound stability of the concrete aggregate through the use of recycled cement. The disposal of industrial wastes can cause extreme environmental harm that can be reduced via recycled cement. However, it has been noted that the presence of harmful materials can result in issues regarding durability. Thus, it is essential to arrange materials for recycled cement that can be effective for construction activities. In order to maintain environmental sustainability and reduce environmental hazards, it is important to utilize the wastages for generating alternative concrete aggregates such as crushed rocks. Thus, this paper reviews the environmental effects of concrete waste pollutants and its sustainable reutilization to promote a cleaner environment and offer benefits to the construction industries with a positive effect.

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“…Taking reuse and recycling practices into consideration as one of the cornerstones of circular economy (Kirchherr et al 2017 ), providing second life to surgical face masks represents a plausible approach to lessen the environmental impacts arising from their undesired accumulation into marine and land environments. The upcycling of discarded materials into high-value functional products have been already proven efficient to reduce the waste´s hazards of polymers while enhancing their functionality (Górak et al 2020 ; Lauria and Lizundia 2020 ).…”

Section: Introductionmentioning

confidence: 99%

Upcycling discarded cellulosic surgical masks into catalytically active freestanding materials

Reguera

¹

,

Zheng

²

,

Shalan

³

et al. 2022

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The COVID-19 pandemic outbreak has resulted in the massive fabrication of disposable surgical masks. As the accumulation of discarded face masks represents a booming threat to the environment, here we propose a solution to reuse and upcycle surgical masks according to one of the cornerstones of the circular economy. Specifically, the non-woven cellulosic layer of the masks is used as an environmentally sustainable and highly porous solid support for the controlled deposition of catalytically active metal-oxide nanoparticles. The native cellulosic fibers from the surgical masks are decorated by titanium dioxide (TiO2), iron oxide (FexOy), and cobalt oxide (CoOx) nanoparticles following a simple and scalable approach. The abundant surface –OH groups of cellulose enable the controlled deposition of metal-oxide nanoparticles that are photocatalytically active or shown enzyme-mimetic activities. Importantly, the hydrophilic highly porous character of the cellulosic non-woven offers higher accessibility of the pollutant to the catalytically active surfaces and high retention in its interior. As a result, good catalytic activities with long-term stability and reusability are achieved. Additionally, developed free-standing hybrids avoid undesired media contamination effects originating from the release of nanoscale particles. The upcycling of discarded cellulosic materials, such as the ones of masks, into high-added-value catalytic materials, results an efficient approach to lessen the waste´s hazards of plastics while enhancing their functionality. Interestingly, this procedure can be extended to the upcycling of other systems (cellulosic or not), opening the path to greener manufacturing approaches of catalytic materials. Graphical abstract A novel approach to upcycle discarded cellulosic surgical masks is proposed, providing a solution to reduce the undesired accumulation of discarded face masks originating from the COVID-19 pandemic. The non-woven cellulosic layer formed by fibers is used as solid support for the controlled deposition of catalytically active titanium dioxide (TiO2), iron oxide (FexOy), and cobalt oxide (CoOx) nanoparticles. Cellulosic porous materials are proven useful for the photocatalytic decomposition of organic dyes, while their peroxidase-like activity opens the door to advanced applications such as electrochemical sensors. The upcycling of cellulose nonwoven fabrics into value-added catalytic materials lessens the waste´s hazards of discarded materials while enhancing their functionality.

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“…Girskas et al [9] studied the effective utilisation of fly ash and demonstrated that this material can inhibit the cement hydration process and can be used to produce cement-based composite materials with better frost resistance and durability. Gorak et al [10] used composite lightweight aggregates (such as fly ash) to partially replace natural aggregates in cement composite materials. They concluded that reducing the water content in the mixture while maintaining good workability can increase the compressive and flexural strength by up to 25% than that of standard mortar.…”

Section: Introductionmentioning

confidence: 99%

Properties and Engineering Applications of a New Goaf Grouting Filling Material

Feng

¹

,

Xia

²

,

Zhang

³

et al. 2022

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In the treatment of goafs in traffic engineering, technical problems such as those related to large-volume grouting and the precise control of material properties are often encountered. To address these issues, we developed a new composite material comprising cement-fly ash-modified sodium silicate (C-FA-MS). The setting time, fluidity, unconfined compressive strength, and microstructure were varied for different proportions of cement-sodium silicate (C-S) slurry, cement-fly ash-sodium silicate (C-FA-S) slurry, and C-FA-MS slurry, and their performances were compared and analysed. The experimental results showed that the initial setting time of the slurry was the shortest when both the original sodium silicate volume ratio ( V S ) and modified sodium silicate volume ratio ( V MS ) were 0.2. The final setting time of the C-S and C-FA-S slurries tended to decrease but then increased with decrease in V S , while that of the C-FA-MS slurry increased with lower V MS . The fluidity of the C-FA-S and C-FA-MS slurries decreased with decrease in V S or V MS at different fly ash admixture ratios. The consolidation compressive strength of C-S increased with decreasing V S , while that of C-FA-S showed a considerable increase only when V S decreased from 0.4 to 0.2. Meanwhile, the compressive strength of the C-FA-MS concretions first increased and then decreased with decrease in V MS . Microstructural analysis revealed that there were more cracks in the C-S agglomerate, the fly ash in the C-FA-S agglomerate reduced the relative density of the skeletal structure, and the stronger cross-linking in the C-FA-MS agglomerate improved the strength of the agglomerate. Under the condition of unit grouting volume, the cost of the C-FA-MS slurry was approximately 44.7% and 31.3% lower than that of the C-S and C-FA-S slurries, respectively. The new C-FA-MS material was applied for the treatment of the goaf in the Wu Sizhuang coal mine. Core drilling detection and audiofrequency magnetotelluric survey revealed that the goaf was sufficiently filled.

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Cementitious eco-composites and their physicochemical/mechanical properties in Portland cement-based mortars with a lightweight aggregate manufactured by upcycling waste by-products

Cited by 16 publications

References 51 publications

Review on Impact of Construction Waste Landfill on Environment and its Reutilization

Review on Impact of Construction Waste Landfill on Environment and its Reutilization

Upcycling discarded cellulosic surgical masks into catalytically active freestanding materials

Properties and Engineering Applications of a New Goaf Grouting Filling Material

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