Recycling and reuse of solid wastes; a hub for ecofriendly, ecoefficient and sustainable soil, concrete, wastewater and pavement reengineering

Onyelowe, Kennedy C.; Van, Duc Bui; Ubachukwu, Obiekwe A.; Ezugwu, Charles; Salahudeen, A. Bunyamin; Van, Manh Nguyen; Ikeagwuani, Chijioke Christopher; Amhadi, Talal; Sosa, Felix; Wu, Wei; Duc, Thinh Ta; Eberemu, Adrian O.; Pham, Duc Tho; Barah, Obinna; Ikpa, Chidozie; Orji, Francis; Alaneme, George Uwadiegwu; Amanamba, Ezenwa Chinenye; Ugwuanyi, Henry; Sai, Vishnu; Kadurumba, Chukwuma H.; Selvakumar, S.; Ugorji, Benjamin

doi:10.1093/ijlct/ctz028

Cited by 48 publications

(14 citation statements)

References 66 publications

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“…Maher and Gray [37] and Consoli et al [10] suggest that the effect of fiber inclusion on dilation and volume change is pronounced at higher load and strain levels, possibly due to the inhibiting action of the fibers. Many authors have reported that the addition of fibers tends to increase the ductility and strength of the soil-fiber composite as well, e.g., References [6,34,[38][39][40][41].…”

Section: Direct Shear Tests In Soil-strip Compositesmentioning

confidence: 99%

Effect of Recycled Polyethylene Terephthalate Strips on the Mechanical Properties of Cement-Treated Lateritic Sandy Soil

et al. 2020

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The civil engineering construction industry is nowadays one of the largest consumers of natural resources. Therefore, the proposal of using alternative materials that seek to reduce waste production or the use of previously generated waste is becoming increasingly necessary. This paper evaluated the effect of recycled polyethylene terephthalate (PET) strips on the mechanical properties of a cement-treated lateritic sandy soil. Unconfined compression strength (UCS) tests were conducted in natural and PET strips mixtures in different strips lengths and contents. In addition to UCS tests, compaction tests were also conducted in order to analyze the effect of these inclusions on the properties of a lateritic sandy soil. Lastly, direct shear tests were conducted on natural soil-strip, soil-cement, and soil-cement-strip composites using optimum UCS results. The addition of strips to the soil-cement composite showed an increase in the soil cohesion parameter. The inclusion of strips also provided a more ductile behavior to the soil, presenting greater deformations with fewer stress peaks. Results showed that the recycled strips’ inclusion in soil-cement can provide a material with high strength, ductility, and a highly sustainable alternative.

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Section: Direct Shear Tests In Soil-strip Compositesmentioning

confidence: 99%

Effect of Recycled Polyethylene Terephthalate Strips on the Mechanical Properties of Cement-Treated Lateritic Sandy Soil

et al. 2020

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“…In recent years, the search for more environmentally friendly construction materials that could replace cement partially or totally led to the research on supplementary cementitious materials (SCM) or pozzolanas [6,7]. ese are construction materials occurring in nature and they are not associated with greenhouse effects and high construction costs as they are obtained free of cost [3,[8][9][10], and in this effort, ash materials have been observed as amorphous and nonbiodegradable, possessing pozzolanic properties with high contents of aluminosilicates that meet the requirements of pozzolanas in accordance with appropriate standards [6,7]. Further investigation has also led to the establishment that ash derived from the direct combustion of solid waste materials is a good SCM, which upon mixing with soft soils improves the construction properties [7,8].…”

Section: Introductionmentioning

confidence: 99%

“…Onyelowe et al [9,10,12], conducted reviews on the recycling and reuse processes of solid waste materials to derive ash for soil stabilization and on the valorization and sequestration of emissions released during the controlled incineration mechanism. In their findings, different relevant literatures were reviewed and cited as supporting the method of ash derivation while maintaining an ecofriendly atmosphere.…”

Section: Introductionmentioning

confidence: 99%

Swelling Potential of Clayey Soil Modified with Rice Husk Ash Activated by Calcination for Pavement Underlay by Plasticity Index Method (PIM)

Onyelowe

Onyia

Nguyen-Thi

et al. 2021

Advances in Materials Science and Engineering

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Volume change in expansive soils is a problem encountered in earth work around the world. This is prominent with hydraulically bound structures or foundations subjected to prolonged moisture exposure. This behavior of clayey used as subgrade, foundation, landfill, or backfill materials causes undesirable structural functionality and failures. To prevent this happening, clayey soils are studied for possible volume change potential and degree of expansion. Consequently, the problematic soils are stabilized. In this work, the stabilization of clayey highly expansive soil classified as A-7-6 soil and highly plastic with high clay content was conducted under laboratory conditions. The treatment exercise was experimented using quicklime-activated rice husk ash (QARHA), hydrated lime-activated rice husk ash (HARHA), and calcite-activated rice husk ash (CARHA) at the rates of 1%, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, and 10%. Upon treatment with the three calcium compounds to produce three sets of treated experimental specimens, the plasticity index was observed and recorded and swelling potentials were evaluated using the plasticity index method (PIM). The results showed a consistent improvement on the properties of the treated soil with the addition of the different activated admixtures. While the utilization of CARHA and HARHA improved the clayey soil to medium expansive soil, the treated clayey soil substantially improved from highly expansive soil with a potential of 23.35% to less expansive with a final potential of 0.59% upon the addition of 10% QARHA. Finally, QARHA was adjudged as the best binding composite due to the highest rate of reduction recorded with its utilization.

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“…Waste sludge (WS) from water purification plants is composed mainly of aluminosilicate. The WS is usually treated by methods as landfills, making ceramic bricks [1][2][3] … However, due to the areas of landfill sites, WS management is a growing global problem 2 . It is necessary to study the treatment of WS by new methods.…”

Section: Introductionmentioning

confidence: 99%

“…Geopolymer is a binder formed by the chemical reaction between aluminosilicate materials and alkaline activated solutions. The alkaline activated solutions are composed of strongly alkaline solutions such as sodium hydroxide (NaOH), potassium hydroxide (KOH), soda ash (Na 2 CO 3 ), calcium hydroxide (Ca(OH) 2 ), and water glass (WG: Na 2 O.nSiO 2 .mH 2 O) 2,3 . Fly ash (FA), silica fume, kiln slag, and metakaolin are the industrial wastes used as raw materials to produce the geopolymers [4][5][6][7] .…”

Section: Introductionmentioning

confidence: 99%

Unbaked materials from mixtures of waste sludge of a water purification plant, fly ash, and water glass

Minh

Nhi

2021

Sci. Tech. Dev. J.- Eng. Tech.

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In water purification plants, a large area of urban land is using to store waste sludge (WS). The waste sludge from water filtration plants is aluminosilicate, which can be form a geopolymer. However, the waste sludge has low alkaline activity, so it must be used in combination with fly ash (FA) to create geopolymer products. Fly ash is a solid waste containing amorphous silica so that has high alkaline activity, suitable for treatment by geopolymer method. The geopolymerization of waste sludge from water purification plants is a relatively new method. The geopolymer is a binder formed by the chemical reaction between aluminosilicate materials and alkaline activated solutions. The alkaline activated solution used in these experiments was water glass (WG). The water glass is solution of sodium silicate (Na2O.nSiO2) dissolved in water. The research results of geopolymer materials from the mixture of fly ash, the waste sludge of Thu Duc water purification plant, Ho Chi Minh City (Vietnam), and water glass (WG) were introduced in this study. The activated Al2O3 and SiO2 oxides in the fly ash and the waste sludge can be dissolved in the water glass and polymerized into a geopolymer material. The test samples had pressed at a high pressure of 225 MPa to form cylindrical ones weighing approximately 3 grams, height about 18 mm, and 10 mm in diameter. These samples were then cured at 110 ◦C for 24 hours and at room temperature (30 +/- 5 ◦C). The methods of Fourier infrared spectroscopy (FTIR) and scanning electron microscope (SEM) had used to detect the microscopic structure and geopolymer bond formation of the samples. The compressive strength of the tested samples at 28 days old was higher than 3.5 MPa, the pH was less than 12.5, meeting the Vietnamese National Standards for unbaked materials (TCVN 6477:2016) and National Technical Regulation on environmental impact (QCVN 50:2013 / BTNMT), respectively. The results show a new approach of solidifying the waste sludge for further applications such as the manufacture of geopolymer concretes or landfill materials.

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Recycling and reuse of solid wastes; a hub for ecofriendly, ecoefficient and sustainable soil, concrete, wastewater and pavement reengineering

Cited by 48 publications

References 66 publications

Effect of Recycled Polyethylene Terephthalate Strips on the Mechanical Properties of Cement-Treated Lateritic Sandy Soil

Effect of Recycled Polyethylene Terephthalate Strips on the Mechanical Properties of Cement-Treated Lateritic Sandy Soil

Swelling Potential of Clayey Soil Modified with Rice Husk Ash Activated by Calcination for Pavement Underlay by Plasticity Index Method (PIM)

Unbaked materials from mixtures of waste sludge of a water purification plant, fly ash, and water glass

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