Use of biomass wood ash to produce sustainable geopolymeric pastes

Silvestro, Laura; Scolaro, Taylana Piccinini; Ruviaro, Artur Spat; Lima, Geannina Terezinha dos Santos; Gleize, Philippe Jean Paul; Pelisser, Fernando

doi:10.1016/j.conbuildmat.2023.130641

Cited by 21 publications

(11 citation statements)

References 71 publications

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“…This validated the analysis of the mortar's mechanical properties. With the increase in the substitution ratio of MK for GGBS, there was a higher content of Al 2 O 3 and SiO 2 , leading to the formation of C(N)–A–S–H gel in the matrix 20 , 53 , 60 . However, no distinct diffraction peaks were observed, possibly due to potential overlap with the diffraction peaks of calcite 61 .…”

Section: Resultsmentioning

confidence: 99%

Effect of borax-modified activator on mechanical properties and drying shrinkage of alkali-activated slag/metakaolin mortar

Chen,

Qin,

Chen

et al. 2024

Sci Rep

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Alkali-activated materials (AAMs) possess several advantages, such as high strengths and low carbon emissions. However, their application is hindered due to their significant shrinkage. This study explored the effect of borax-modified sodium silicate activator and metakaolin (MK) on the mechanical properties and drying shrinkage (DS) of alkali-activated slag (AAS) and AAS/MK (AASM) mortars. X-ray diffraction, scanning electron microscopy, and Fourier-transform infrared spectroscopy were used to characterize the hydration products. The results showed that the DS reduction of the AAS mortar was related to decreased Na2O content, a reduction in the proportion of mesopores, and the formation of moisture-retaining borate compounds. The DS reduction of the AASM mortar was attributed to the ultra-fine differential effect induced by MK, reducing the connected pores. The modified activator combined with MK increased the chemically bound water content in the matrix. Additionally, the B–O bond and highly active MK improved compactness of the AASM mortar. The use of borax-modified activators and MK provides a new solution to address the significant shrinkage issue in AAMs. This sets the stage for AAMs to potentially replace OPC, contributing to low-carbon emissions and promoting environmental protection.

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Section: Resultsmentioning

confidence: 99%

Effect of borax-modified activator on mechanical properties and drying shrinkage of alkali-activated slag/metakaolin mortar

Chen,

Qin,

Chen

et al. 2024

Sci Rep

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“…The use of biomass ash in geopolymer synthesis is mainly done in two ways: • By using the ash in a solid form where it acts as an alternate aluminosilicate precursor in different ratios (Silvestro et al, 2023) and • By extracting the content of the ash and filtering it out to obtain a clear solution (Liu et al, 2022).…”

Section: Methods Of Using Biomass Ash In Geopolymersmentioning

confidence: 99%

“…Biomass is one of the renewable sources of energy which is derived from an organic source obtained from plants and animals like wood, crops, seaweed and animal wastes (Sokan-Adeaga & Ana, 2015). Biomass sources with high and medium silica content, such as rice husk ash, corn cob ash, sugar cane bagasses ash, wood ash and olive palm ash, have all been investigated either as an alternative aluminosilicate source (Eliche-Quesada et al, 2020;Silvestro et al, 2023) or as an alkaline solution (Kamseu et al, 2017;Tong et al, 2018). Sources, mostly those from agricultural residues, have higher silica content when compared with wood sources and could serve as alternative sources of silicates, which would be a more environmentally friendly option and enable the utilization of locally available materials.…”

Section: Introductionmentioning

confidence: 99%

The Role of Biomass in the Synthesis of Geopolymers: A Review

Maria Kaka Etete Enoh

2023

ijird

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The need to attain a sustainable economy has encouraged researchers to develop alternate routes to the production of geopolymers. Considering the high emissions of CO2 in the production of ordinary Portland cement (OPC), geopolymers which are conventionally produced by mixing an aluminosilicate source with activators, are projected as their possible substitutes due to their lower emissions. There is, however, a need to further reduce the effect of their synthesis on other environmental indices and also lower production costs. Several sources of biomass such as rice husk, sugar cane bagasse, olive pine bottom ash, maize husk, maize cob and many others, due to their renewable form and high silica content, have been investigated for this purpose. Calcium-rich ashes such as wood ash have also been used. The results obtained vary widely but also suggest that there are feasible replacements for the synthetic silicate solution. This review projects results obtained from various researchers and various sources of biomass and compares their methods of introducing biomass in geopolymer binders.

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“…62 The addition of biomass wood ash to metakaolin allowed the production of geopolymers with improved mechanical properties and reduced CO 2 equivalent emissions. 63 Jaradat et al 64 developed hybrid geopolymers with high compressive strength by combining calcined geopolymers with olive biomass.…”

Section: Introductionmentioning

confidence: 99%