Comparative characteristics assessment of calcined and uncalcined agro-based waste ash with GGBS and its application in an alkali-activated binder system

Blesson, S.; Rao, Asha Udaya; Bhandary, Rahul; Shetty, Prathibha P.; Thomas, Blessen Skariah

doi:10.1080/23311916.2023.2220483

Cited by 12 publications

(2 citation statements)

References 75 publications

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“…According to the literature total amount of GGBFS production will reach around 270 million tonnes between 2020 and 2025 globally. In India, as per the study of Indian bureau of Mines, the annual GGBFS production is approximately be greater than 17 million tons with its major utilisation in slag based cements 11 – 13 .…”

Section: Introductionmentioning

confidence: 99%

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: Introductionmentioning

confidence: 99%

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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“…Due to the widespread commerce in coffee beans, plantations produce enormous amounts of coffee pulp and husk that are eventually disposed of in landfills [13]. Moreover, it generates around 250,000 tons of coffee waste every year globally [14]. Using a ton of fresh coffee, an estimated 0.18 tons of coffee husk and 0.5 tons of coffee pulp are produced [15].…”

Section: Introductionmentioning

confidence: 99%

Application of Coffee Husk Ash as Partial Replacement of Fine Aggregate in Concrete

Bhandary,

Rao,

Shetty

et al. 2023

Sustainability

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The task of turning agricultural waste into practical construction and building materials has been placed before civil engineers. Coffee husk is produced in vast amounts due to the global commerce of coffee beans, which are incinerated into ash when used as fuel, producing coffee husk ash (CHA). Even though many researchers have worked on the utilization of CHA in concrete, they have been used as partial cement replacement but not as a replacement of aggregates. The experimental study of the performance of concrete on fine aggregate replaced partially with CHA is represented in this paper. The fine aggregate is replaced by 0%, 2%, 4%, 6%, and 8% by weight of CHA. The performance of the partially replaced fine aggregate with CHA is reviewed by considering the compressive strength and workability of fresh concrete and the splitting tensile strength, flexural strength, durability under acid and alkaline media, thermal conductivity, and rapid chloride permeability test of hardened concrete. The results indicate that the partial replacement of fine aggregate with 4% of CHA (CHA04) in concrete provides a positive impact to all the selected performance parameters. The compressive strength, flexural strength, and splitting tensile of the CHA04 mix were 43.4 MPa, 3.7 MPa, and 2.44 MPa, respectively, which were 28.4%, 19.35%, and 1.66%, respectively, greater than normal concrete mix (CHA00). Even the study of acid and alkaline attack on the CHA04 mix showed lesser strength reduction as compared to other mixes. The RCPT showed less chloride permeability, and the thermal conductivity is higher for CHA04, indicating lesser voids compared to other mixes. With the help of this investigation, it can be said that fine aggregate replacement with 4% CHA has the best strength and durability properties compared to regular concrete.

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Performance of concrete produced with alkali-activated artificial aggregates

Bekkeri,

Shetty,

Nayak

2024

J Mater Cycles Waste Manag

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The excessive use of natural aggregates raises mining activity. Further, it leads to environmental damage, which can be reduced using artificial aggregates produced from waste powdered materials. This study discussed the production process of alkali-activated artificial coarse aggregates and how their use affects the behavior of concrete. The different concrete mixtures were designed by replacing natural aggregates with artificial ones at different percentages. Various tests were conducted to determine concrete’s fresh, hardened, permeability, and microstructural characteristics. The result showed that concrete incorporated with artificial aggregates can achieve higher workability and lower density than natural aggregate concrete. The mechanical strengths were slightly decreased as the percentage addition of artificial aggregates in a mix increased. However, adding up to 50% showed comparable results to natural aggregate concrete. The water permeability and chloride ion penetration were within the standard limits for all the mixes. The scanning electron micrographs showed a solid and compact ITZ between the phases. XRD pattern revealed that the addition of artificial aggregates had not changed the mineralogical composition of the concrete; the formation of hydrated products helps concrete obtain strength. The study concluded that artificial aggregates could effectively replace natural coarse aggregate in producing structural concrete with many advantages.

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Comparative characteristics assessment of calcined and uncalcined agro-based waste ash with GGBS and its application in an alkali-activated binder system

Cited by 12 publications

References 75 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

Application of Coffee Husk Ash as Partial Replacement of Fine Aggregate in Concrete

Performance of concrete produced with alkali-activated artificial aggregates

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