Environmental evaluation and economic analysis of fly ash-rice husk ash blended alkali-activated bricks

Fernando, Sarah; Gunasekara, Chamila; Law, David W.; Nasvi, M. C. M.; Setunge, Sujeeva; Dissanayake, Ranjith; Robert, Dilan

doi:10.1016/j.eiar.2022.106784

Cited by 18 publications

(4 citation statements)

References 24 publications

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“…The values reported in the literature is in agreement with the carbon emission values obtained in the present study. Another similar study regarding environmental assessment on rice husk ash incorporation in fly ash bricks with alkali activation shows almost 60–90% of environmental impact is due to manufacturing of raw materials 49 , 52 .…”

Section: Resultsmentioning

confidence: 88%

Large CO2 reduction and enhanced thermal performance of agro-forestry, construction and demolition waste based fly ash bricks for sustainable construction

Singh,

Maiti,

Bisht

et al. 2024

Sci Rep

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The exhaust gases in production of burnt clay bricks is responsible for greenhouse gases (GHGs) emission which increase the carbon footprint in the ecosystem. Here, we report carbon emission and thermal performance based evaluation of 8 ft. × 9 ft. × 8 ft. building. The bricks used in building construction are manufactured from fly ash, agro-forestry wastes, construction & demolition wastes (C&D), ground granulated blast furnace slag (GGBFS) using NaOH as activator in order to provide compressive strength in the range of 3–6 MPa with ambient curing at 30 °C for 28 days. Life cycle analysis (LCA) reveals the total CO2 emission for fly ash and burnt clay bricks estimated to be 43.28 gCO2 and 290 gCO2 per brick, respectively. Considering the current scenario, by replacing 1–2% of brunt clay bricks with agro-forestry waste, C&D waste based fly ash bricks can potentially reduce 0.5–1.5 million tons of CO2 emission annually. The embodied energy calculation shows fly ash based bricks consumes 10–15 times less energy as compared to burnt clay bricks. Thermal paremeters viz., U-value (0.5–1.2 W/m2K), thermal conductivity (0.4–0.5 W/mK) show adequate insulation of agro-forestry waste based fly ash bricks highlighting its importance of thermal comfort, CO2 reduction along with sustainable and eco-friendly construction practices.

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Section: Resultsmentioning

confidence: 88%

Large CO2 reduction and enhanced thermal performance of agro-forestry, construction and demolition waste based fly ash bricks for sustainable construction

Singh,

Maiti,

Bisht

et al. 2024

Sci Rep

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“…Therefore, when it is compared to ce-ment production, it presents savings in the scarcity of natural resources category. In addition, (74) found that there are environmental benefits as the impacts due to the disposal of RHA are reduced, since a residue becomes a valuable product and therefore a natural resource.…”

Section: Comparison Of the Cementsmentioning

confidence: 99%

Life cycle analysis and economic evaluation of cement and concrete mixes with rice husk ash: application to the Colombian context

Suárez Silgado,

Calderón Valdiviezo,

Betancourt Quiroga

2024

Mater. constr.

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Rice husk residues are generated within the rice industry. In this research, the environmental impact of the use of rice husk ash is evaluated as a replacement for cement in the production of concrete in the city of Ibagué (Colombia). The environmental criteria of cement and concrete production alternatives were evaluated through life cycle analysis methodology, using SimaPro 9.3.3 software and the Recipe 2016 Midpoint (H) evaluation method. The economic cost of each of these production alternatives was included. To carry out the study, surveys and interviews had to be undertaken with rice-producing plants, aggregates, cement and concrete plants in Tolima. It was corroborated that rice husk ash (RHA) generated during the rice husk (RH) gasification process for electricity and heat production was beneficial from an environmental and economic perspective when it was used in cement and concrete in the city of Ibague (Colombia).

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“…[ 53 ] Several studies have used this sodium hydroxide solution to remove toxic elements, such as cadmium and arsenic, in RH ash. [ 54 ] When separating silica from a solution by alkaline leaching, silica precipitate can be obtained by blowing and neutralizing the solution with carbon dioxide. [ 55 ] Alkaline leaching has also been applied in several cases for the selective separation of lignin from biomass because lignin dissolves in alkaline conditions compared with cellulose and hemicellulose, which do not.…”

Section: Separation Technology For Carbon and Silica Componentsmentioning

confidence: 99%

Progress on Separation and Hydrothermal Carbonization of Rice Husk Toward Environmental Applications

et al. 2023

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Owing to the increasing global demand for carbon resources, pressure on finite materials, including petroleum and inorganic resources, is expected to increase in the future. Efficient utilization of waste resources has become crucial for sustainable resource acquisition for creating the next generation of industries. Rice husks, which are abundant worldwide as agricultural waste, are a rich carbon source with a high silica content and have the potential to be an effective raw material for energy‐related and environmental purification materials such as battery, catalyst, and adsorbent. Converting these into valuable resources often requires separation and carbonization; however, these processes incur significant energy losses, which may offset the benefits of using biomass resources in the process steps. This review summarizes and discusses the high value of RHs, which are abundant as agricultural waste. Technologies for separating and converting RHs into valuable resources by hydrothermal carbonization are summarized based on the energy efficiency of the process.

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Environmental evaluation and economic analysis of fly ash-rice husk ash blended alkali-activated bricks

Cited by 18 publications

References 24 publications

Large CO2 reduction and enhanced thermal performance of agro-forestry, construction and demolition waste based fly ash bricks for sustainable construction

Large CO2 reduction and enhanced thermal performance of agro-forestry, construction and demolition waste based fly ash bricks for sustainable construction

Life cycle analysis and economic evaluation of cement and concrete mixes with rice husk ash: application to the Colombian context

Progress on Separation and Hydrothermal Carbonization of Rice Husk Toward Environmental Applications

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