Possibilities for the application of agro-industrial wastes in cementitious materials: A brief review of the Brazilian perspective

Azevedo, Afonso Rangel Garcez de; Amin, Mohamed; Hadzima-Nyarko, Marijana; Agwa, Ibrahim Saad; Zeyad, Abdullah M.; Tayeh, Bassam A.; Adesina, Adeyemi

doi:10.1016/j.clema.2021.100040

Cited by 59 publications

(16 citation statements)

References 81 publications

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“…Coconut fiber is a common fiber in Brazil. A large amount of research is related to incorporation into mortar [ 11 , 80 , 81 , 82 , 83 ]. Danso and Manu [ 81 ] analyzed the differences in the characteristics of soil–cement mortar composites by increasing the content of incorporated coconut fibers and the amount of lime in the composite.…”

Section: Properties and Importance Of Use In Cementitious Materialsmentioning

confidence: 99%

A Review of the Use of Natural Fibers in Cement Composites: Concepts, Applications and Brazilian History

Rocha¹,

Júnior²,

Marvila³

et al. 2022

Polymers

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The use of natural lignocellulosic fibers has become popular all over the world, as they are abundant, low-cost materials that favor a series of technological properties when used in cementitious composites. Due to its climate and geographic characteristics, Brazil has an abundant variety of natural fibers that have great potential for use in civil construction. The objective of this work is to present the main concepts about lignocellulosic fibers in cementitious composites, highlighting the innovation and advances in this topic in relation to countries such as Brazil, which has a worldwide prominence in the production of natural fibers. For this, some common characteristics of lignocellulosic fibers will be observed, such as their source, their proportion of natural polymers (biological structure of the fiber), their density and other mechanical characteristics. This information is compared with the mechanical characteristics of synthetic fibers to analyze the performance of composites reinforced with both types of fibers. Despite being inferior in tensile and flexural strength, composites made from vegetable fibers have an advantage in relation to their low density. The interface between the fiber and the composite matrix is what will define the final characteristics of the composite material. Due to this, different fibers (reinforcement materials) were analyzed in the literature in order to observe their characteristics in cementitious composites. Finally, the different surface treatments through which the fibers undergo will determine the fiber–matrix interface and the final characteristics of the cementitious composite.

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Section: Properties and Importance Of Use In Cementitious Materialsmentioning

confidence: 99%

A Review of the Use of Natural Fibers in Cement Composites: Concepts, Applications and Brazilian History

Rocha¹,

Júnior²,

Marvila³

et al. 2022

Polymers

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“…As a result, a huge amount of plastic waste is generated that needs extra care for its proper disposal. It is estimated that 30% of plastic waste generated comes from agriculture and packaging with a high risk of lagging agricultural system contamination [ 9 , 18 ]. Hence, the use of biodegradable materials is required, as they are suitable because of their physicochemical and mechanical properties to replace traditional plastics, thereby reducing the waste generation.…”

Section: Introductionmentioning

confidence: 99%

Gelatin- and Papaya-Based Biodegradable and Edible Packaging Films to Counter Plastic Waste Generation

et al. 2022

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Most of the food packaging materials used in the market are petroleum-based plastics; such materials are neither biodegradable nor environmentally friendly and require years to decompose. To overcome these problems, biodegradable and edible materials are encouraged to be used because such materials degrade quickly due to the actions of bacteria, fungi, and other environmental effects. In this work, commonly available household materials such as gelatin, soy protein, corn starch, and papaya were used to prepare cost-effective lab-scale biodegradable and edible packaging film as an effective alternative to commercial plastics to reduce waste generation. Prepared films were characterized in terms of Fourier transform infrared spectroscopy (FTIR), water vapor transmission rate (WVTR), optical transparency, and tensile strength. FTIR confirmed the addition of papaya and soy protein to the gelatin backbone. WVTR of the gelatin-papaya films was recorded to be less than 50 g/m2/day. This water vapor barrier was five times better than films of pristine gelatin. The gelatin, papaya, and soy protein films exhibited transparencies of around 70% in the visible region. The tensile strength of the film was 2.44 MPa, which improved by a factor of 1.5 for the films containing papaya and soy protein. The barrier qualities of the gelatin and gelatin-papaya films maintained the properties even after going through 2000 bending cycles. From the results, it is inferred that the prepared films are ideally suitable for food encapsulation and their production on a larger scale can considerably cut down the plastic wastage.

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“…Reducing environmental challenges and impacting ecological and socio-economic aspects of resource management are several advantages of utilizing a natural fiber [ 11 ]. In addition, Azevedo et al [ 12 ] reported that application in the development of alternative composite materials is one way to manage this natural fiber or agro-industrial waste effectively.…”

Section: Introductionmentioning

confidence: 99%

Mechanical and Physical Properties of Particleboard Made from the Sumatran Elephant (Elephas maximus sumatranus) Dung and Wood Shaving

et al. 2022

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Sumatran elephants (Elephas maximus sumatranus) are the world’s largest living land mammals. The elephant’s digestive system can only absorb 40% of the nutrients in digested feed, and the remainder is excreted as dung. Elephant dung waste can be used as a particleboard material due to its high fiber content. The objectives of this study are: (i) to prepare elephant dung waste as raw material for particleboard, (ii) to improve elephant dung particleboard’s physical and mechanical properties using wood shavings, and (iii) to study the influence of several parameters on the physical and mechanical properties of particleboard. The particleboard dimensions and density were set at 20 cm × 20 cm × 1 cm and 0.8 g/cm3, respectively. The mixture ratio of elephant dung and wood shavings was 100/0, 90/10, 80/20, 70/30, 60/40, and 50/50 (% w/w). This mixture ratio of particles was sprayed with 7% isocyanate adhesive. The pressing at a pressure of 30 kg/cm2 for 5 min and 160 °C was used in this study. The physical and mechanical properties of particleboard were tested according to JIS A 5908 (2003) standard. The result shows that the addition of wood shaving improved the elephant dung particleboard’s physical and mechanical properties. Except for moisture content and water absorption, the addition of wood shavings has a significant effect on elephant dung particleboard’s physical and mechanical properties. The best ratio of elephant dung and wood-shaving for this research is 50/50 and has fulfilled the JIS A 5908-2003 standard, except for thickness swelling.

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Possibilities for the application of agro-industrial wastes in cementitious materials: A brief review of the Brazilian perspective

Cited by 59 publications

References 81 publications

A Review of the Use of Natural Fibers in Cement Composites: Concepts, Applications and Brazilian History

A Review of the Use of Natural Fibers in Cement Composites: Concepts, Applications and Brazilian History

Gelatin- and Papaya-Based Biodegradable and Edible Packaging Films to Counter Plastic Waste Generation

Mechanical and Physical Properties of Particleboard Made from the Sumatran Elephant (Elephas maximus sumatranus) Dung and Wood Shaving

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