Reduction in CO2 emissions during production of cement, with partial replacement of traditional raw materials by civil construction waste (CCW)

Costa, Fernanda Nepomuceno; Ribeiro, Daniel Véras

doi:10.1016/j.jclepro.2020.123302

Cited by 89 publications

(20 citation statements)

References 41 publications

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“…Scanning electron microscope coupled with energy‐dispersive X‐ray spectroscopy (SEM/EDS) analysis of sodium silicate activator powder: (A), (B), and (C) SEM of sodium silicate activator powder at 100x, 500x and 2.0kx Mag 1 . EDS analysis of spots 1, Na/Si = 1.157…”

Section: Resultsmentioning

confidence: 99%

“…Due to the limestone calcination and the combustion of fuel for heating the kiln (up to 1450 • C), Portland cement production is deemed responsible for about 5%-7% of the world's CO 2 emissions. 1 Alkali activation of aluminosilicate and calcium silicate materials for the production of inorganic binders called alkali-activated materials (AAM -sometimes referred to as 'geopolymers', although this term should preferably be used in relation to low calcium sub-family of AAM) has been extensively investigated in the last decades. AAM can show mechanical and durability properties equal or superior to those of Portland cement concrete, but with reduced associated carbon emissions.…”

Section: Introductionmentioning

confidence: 99%

“…Current worldwide concern over the carbon emissions of the construction sector relates mainly to the use of Portland cement in the manufacture of concrete. Due to the limestone calcination and the combustion of fuel for heating the kiln (up to 1450°C), Portland cement production is deemed responsible for about 5%–7% of the world's CO 2 emissions 1 . Alkali activation of aluminosilicate and calcium silicate materials for the production of inorganic binders called alkali‐activated materials (AAM – sometimes referred to as ‘geopolymers’, although this term should preferably be used in relation to low calcium sub‐family of AAM) has been extensively investigated in the last decades.…”

Section: Introductionmentioning

confidence: 99%

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Bio‐derived sodium silicate for the manufacture of alkali‐activated binders: Use of bamboo leaf ash as silicate source

Vinai

Ntimugura

Cutbill

et al. 2022

Int J Applied Ceramic Tech

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Alkali activated binders are a promising alternative to the use of Portland cement in the manufacture of concrete for curbing CO2 emissions. Novel sources of silicates have been investigated in recent years for reducing cost and environmental impacts associated with the use of chemical activators. This study describes the production of solid sodium silicate (SS) activating powder from bamboo leaf ash (BLA). Bamboo leaves were calcined at 550–800°C, mixed with NaOH pellets, and heated in an oven at 300°C. The obtained silicate powder was used for activating blended fly ash/slag samples. Mechanical and microstructural properties of BLA‐based samples were compared to those of samples made with commercially available chemicals. The strength of BLA‐activated mortars matched the commercially‐sourced activators, being 25–30 MPa at 7 days and exceeding 40 MPa at 28 days. The microstructural analysis suggested that BLA‐based SS showed a lesser degree of dissolution of precursors at 7 days, but the quality of the matrix was higher than that of NaOH‐activated samples. These results confirmed that the reactivity of BLA‐silicate powder was similar to that of commercial SS solutions, and show the potential valorization of future biomass renewable waste in the production of low carbon, alkali‐activated concretes.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Bio‐derived sodium silicate for the manufacture of alkali‐activated binders: Use of bamboo leaf ash as silicate source

Vinai

Ntimugura

Cutbill

et al. 2022

Int J Applied Ceramic Tech

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“…Thermal analyses were performed to confirm CO 2 emission estimates per ton of each formulation from the sintering process. This was based on the method proposed by Costa and Ribeiro [ 32 ] and consisted of TG and DTG on the raw materials and formulations. The analysis temperature varied from 550 to 850 °C, which was the main interval of mass loss from decarbonation.…”

Section: Methodsmentioning

confidence: 99%

Production of Belite Based Clinker from Ornamental Stone Processing Sludge and Calcium Carbonate Sludge with Lower CO2 Emissions

et al. 2022

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Environmental concerns have come to the forefront due to the substantial role of the cement industry in the extraction and expenditure of natural resources. Additionally, industrial processes generate a considerable amount of waste, which is frequently disposed of inadequately. The objective of this study was to evaluate the simultaneous use of ornamental rock processing sludge and calcium carbonate sludge generated from the kraft process in the production of belitic clinker. These waste materials would be used in total or partial substitution of natural raw materials, namely, limestone and clay. Several formulations were produced and sintered at 1100 and 1200 °C. The raw materials were characterized physico-chemically and thermogravimetrically, with subsequent evaluation of the resulting dosed raw mixes. Mineral analyses determined that the mixtures with limestone and clay in substitution ratios of 95% and 100%, respectively, and sintered at 1100 °C have the potential to produce belite-rich clinkers. This temperature is considerably lower than those reported in reference studies. Additionally, full limestone and clay substitution could result in a 23.92% reduction in carbon dioxide in clinker production. The results confirmed the potential use of ornamental rock processing sludge and calcium carbonate sludge as viable alternative materials for cement production and, consequently, could contribute to a reduction in the negative environmental impacts of this industry.

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“…The production of one of the main constituent of concrete named cement results in emission of huge quantity of greenhouse gases particularly CO 2 . It has been reported that the production of each ton of cement results into emission of about one ton of CO 2 to the atmosphere [4][5][6][7]. Globally, cement production accounts for 5-7% of the total anthropogenic CO 2 [8].…”

Section: Introductionmentioning

confidence: 99%

Sustainable, Energy Efficient and Economical Design of Single-Family Dwellings

Nassar¹,

Sediadi²,

Elmenghawi³

2021

cea

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Large scale construction of housing units and other built infrastructure in the United Arab Emirates (UAE) and other Middle Eastern countries result in consumption of huge quantities of aggregate, water and cementitious materials causing fast depletion of these resources. Extreme weathering conditions, on the other hand, require construction of housing units having energy intensive serviceability resulting into uneconomical construction and operational costs of these housing units. This situation merits developing design and construction techniques of these housing units that are sustainable, energy efficient and economical. This paper suggests innovative design and construction approaches for development of single-family housing units that address these requirements. The suggested techniques incorporate the use of recycled and industrial by-products towards production of green concrete and concrete masonry units (CMU) and an architectural design that is based on the concept of use of optimized space and configuration integrated with use of sun shading devices. Field investigation of the energy efficiency of a housing unit constructed according to the suggested architectural design and construction materials showed considerable savings in cooling load of building in summer when compared with that of a traditional building.

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Reduction in CO2 emissions during production of cement, with partial replacement of traditional raw materials by civil construction waste (CCW)

Cited by 89 publications

References 41 publications

Bio‐derived sodium silicate for the manufacture of alkali‐activated binders: Use of bamboo leaf ash as silicate source

Bio‐derived sodium silicate for the manufacture of alkali‐activated binders: Use of bamboo leaf ash as silicate source

Production of Belite Based Clinker from Ornamental Stone Processing Sludge and Calcium Carbonate Sludge with Lower CO2 Emissions

Sustainable, Energy Efficient and Economical Design of Single-Family Dwellings

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