Characterization of different biomass ashes as supplementary cementitious material to produce coating mortar

Bonfim, Walter Batista; Paula, Heber Martins de

doi:10.1016/j.jclepro.2021.125869

Cited by 36 publications

(17 citation statements)

References 33 publications

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“…This feature is beneficial if no other factors are harmed. The values obtained are compatible with other similar studies, such as by Bonfim et al (2021) [ 37 ] and Souza et al (2020) [ 38 ].…”

Section: Resultssupporting

confidence: 93%

“…Azevedo et al (2020) [ 12 ] obtained values ranging from 0.8 MPa to 1.1 MPa replacing natural sand with sand from waste paper; Marvila et al (2019) [ 3 ] obtained values from 1.0 MPa to 1.1 MPa with the same mortar composition. Similar results were obtained by Bonfim et al (2021) [ 37 ] and Souza et al (2020) [ 38 ]. Therefore, the flexural strength values are compatible.…”

Section: Resultssupporting

confidence: 90%

“…It is observed that 0%, 10%, and 20% had capillarity coefficient below 20 g/dm².min 1/2 ; however, the 30% composition again presented excessive and non-standard values. Comparing with the results of other researches, it is observed that Azevedo et al (2020) [ 8 ] resented a capillary coefficient between 15 and 18 g/dm².min 1/2 ; Bonfim et al (2021) [ 37 ] obtained values around 20 g/dm².min 1/2 ; and Azevedo et al (2020) [ 12 ] presented values ranging between 14 and 18 g/dm².min 1/2 . Therefore, the results obtained are consistent.…”

Section: Resultsmentioning

confidence: 59%

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Recycled PET Sand for Cementitious Mortar

Campanhão¹,

Marvila

Azevedo³

et al. 2021

Materials

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Cementitious materials cause a great impact on the environment due to the calcination of clinker and the extraction of non-renewable mineral resources. In this work, the replacement of quartz sand from the river by PET sand was evaluated at levels of 10%, 20%, and 30%. Tests were performed in the fresh state through consistency, air retention, density, and incorporated air and in the hardened state for compressive strength, flexural strength, density, capillarity, and water absorption. The results show that PET sand is viable in contents of up to 10%, improving the mechanical properties of the mortar and without compromising its workability and incorporated air properties. Above that level, the loss of properties is very excessive, mainly of workability and incorporated air. The incorporated air of the 30% composition, for example, reaches 24%, an excessive value that impacts the properties of the hardened state, making it impossible to use the material at levels greater than 20%. It is concluded that the use of recycled PET sand is a possibility that contributes to sustainable development, as it reduces the extraction of quartz sand from the river, a non-renewable mineral resource.

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Section: Resultssupporting

confidence: 93%

Section: Resultssupporting

confidence: 90%

Section: Resultsmentioning

confidence: 59%

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Recycled PET Sand for Cementitious Mortar

Campanhão¹,

Marvila

Azevedo³

et al. 2021

Materials

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“…These values show a huge biomass residue potential with minimal end-use due to the lack of study or available options for value addition. Silicon dioxide (silica) is one of the most valuable inorganic materials with a range of industrial applications such as an alternative to ordinary Portland cement [25], a precursor for the synthesis of water glass [26], a rubber filler [27], an adsorbent for the treatment of effluents [28], silica mesoporous material [29], a support system in catalysis operations [30] and coatings in epoxy paints [31]. However, the conventional synthesis of silica from a mineral-based precursor, tetraethyl orthosilicate (TEOS), involves a high thermal hydrolysis process.…”

Section: Introductionmentioning

confidence: 99%

“…Through thermochemical conversion and leaching procedures, pure silica can be generated from the residues as the bottom ash [43] or fly ash [44] contains a significant amount of silica. The high silica content in fly and bottom ashes can find applications in the production of zeolites and admixtures in cement [25,44].…”

Section: Introductionmentioning

confidence: 99%

Extraction and Characterization of Biogenic Silica Obtained from Selected Agro-Waste in Africa

et al. 2021

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Increased amounts of available biomass residues from agricultural food production are present widely around the globe. These biomass residues can find essential applications as bioenergy feedstock and precursors to produce value-added materials. This study assessed the production of biogenic silica (SiO2) from different biomass residues in Africa, including cornhusk, corncob, yam peelings, cassava peelings and coconut husks. Two processes were performed to synthesize the biogenic silica. First, the biomass fuels were chemically pre-treated with 1 and 5% w/v citric acid solutions. In the second stage, combustion at 600 °C for 2 h in a muffle oven was applied. The characterization of the untreated biomasses was conducted using Inductively coupled plasma—optical emission spectrometry (ICP-OES), thermal analysis (TG-DTA) and Fourier-transform infrared spectroscopy (FTIR). The resulting ashes from the combustion step were subjected to ICP, nitrogen physisorption, Energy dispersive X-ray spectroscopy (EDX) as well as X-ray diffraction (XRD). ICP results revealed that the SiO2 content in the ashes varies between 42.2 to 81.5 wt.% db and 53.4 to 90.8 wt.% db after acidic pre-treatment with 1 and 5 w/v% acid, respectively. The relative reductions of K2O by the citric acid in yam peel was the lowest (79 wt.% db) in comparison to 92, 97, 98 and 97 wt.% db calculated for corncob, cassava peel, coconut husk and cornhusk, respectively. XRD analysis revealed dominant crystalline phases of arcanite (K2SO4), sylvite (KCl) and calcite (CaCO3) in ashes of the biomass fuels pre-treated with 1 w/v% citric acid due to potassium and calcium ions present. In comparison, the 5 w/v% citric acid pre-treatment produced amorphous, biogenic silica with specific surface areas of up to 91 m2/g and pore volumes up to 0.21 cm3/g. The examined biomass residues are common wastes from food production in Africa without competition in usage with focus application. Our studies have highlighted a significant end-value to these wastes by the extraction of high quality, amorphous silica, which can be considered in applications such as catalyst support, construction material, concrete and backing material.

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