Assessing the sustainability potential of alkali-activated concrete from electric arc furnace slag using the ECO2 framework

Hafez, Hisham; Kassim, Dany; Kurda, Rawaz; Silva, Rui V.; Brito, Jorge de

doi:10.1016/j.conbuildmat.2021.122559

Cited by 44 publications

(10 citation statements)

References 42 publications

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“…Immense efforts are being made to reduce the harm of carbonation to concrete by trying different methods. For example, the replacement of ordinary Portland cement by alkali-activated materials may decrease the emission of carbon dioxide from the root [ 5 ]; the application of red ceramics could weaken the carbonation effect of carbon dioxide on RCA [ 6 ], carbonation pretreatment of RCA could decrease water absorption of cement mortar samples [ 7 ], et cetera.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties and Uniaxial Compression Stress—Strain Relation of Recycled Coarse Aggregate Concrete after Carbonation

Chen

Dong

2021

Materials

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The application of recycled coarse aggregate (RCA) made from waste concrete to replace natural coarse aggregate (NCA) in concrete structures can essentially reduce the excessive consumption of natural resources and environmental pollution. Similar to normal concrete structures, recycled concrete structures would also suffer from the damage of carbonation, which leads to the deterioration of durability and the reduction of service life. This paper presents the experimental results of the cubic compressive strength, the static elastic modulus and the stress–strain relation of recycled coarse aggregate concrete (RAC) after carbonation. The results show that the cubic compressive strength and the static elastic modulus of carbonated RAC gradually increased with the carbonation depth. The uncarbonated and fully carbonated RAC show smaller static elastic modulus than natural aggregate concrete (NAC). As the carbonation depth increased, the peak stress increased, while the peak strain decreased and the descending part of the curves gradually became steeper. As the content of RCA became larger, the peak stress decreased, while the peak strain increased and the descending part of the curves gradually became steeper. An equation for stress–strain curves of RAC after carbonation was proposed, and it was in good agreement with the test results.

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Section: Introductionmentioning

confidence: 99%

Mechanical Properties and Uniaxial Compression Stress—Strain Relation of Recycled Coarse Aggregate Concrete after Carbonation

Chen

Dong

2021

Materials

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“…Environmental and economic sustainability is mostly paid attention due to concerns on the built environment and feasible application respectively while social sustainability is mostly not considered. Hafez et al (2021) pointed out the challenge for sustainability performance calculations and expressed that it is not easy for occupants to study the optimum mix based on combined, functional, environmental and economic influences. Zuo et al (2012) stated that corporate social responsibility is an important ideology from the social and environmental aspects.…”

Section: Balanced Score Modelmentioning

confidence: 99%

Waste coal cement concrete for sustainable production

Bostanci,

Ajogi,

Kew

2023

European Journal of Environmental and Civil Engineering

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Concrete industry aims to mitigate its environmental footprint and provide cost-effective approaches for the promotion of sustainable development goals. Waste utilisation in concrete production could satisfy sustainability credentials. However, performance of waste incorporated mixes is not fully clear which limits the use of waste materials. Thus, a clear quantitative evaluation cannot be established.Locally obtained waste coal ash (WCA) was used in this study as a replacement to both CEM I and CEM II/B-S cements with replacement levels of 10% and 20% to achieve sustainable concrete production. Developed concretes were tested against various engineering properties (slump, density, compressive strength, water permeability and porosity) and sustainability characteristics (social, environmental and economic). A balanced scoring system have been used to evaluate the overall performance of laboratory mixes.Results revealed that WCA use provided similar slump values but reduced the fresh density. WCA mixes had lower compressive strength but enhanced absorption characteristics. Environmental and economic sustainability showed significant reductions while social sustainability indicators (sound permeability and thermal conductivity) showed enhanced performances for WCA mixes suggesting potential use for sustainable construction applications. Overall performances suggest that WCA mixes can improve overall performance by 11% and 15.5% for 10% and 20% replacement levels respectively.

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“…The life-cycle stages considered in an LCA should always include the procedures consuming lots of energy or generating a large amount of waste (Gursel, 2014;Hafez et al, 2021aHafez et al, , 2021b. Accordingly, the major processes considered in this analysis were extracting and processing fuels, electric power generation, mining and handling raw materials, manufacturing and processing cement, supplementary cementitious materials (SCMs) and admixtures, as well as concrete batching and all transportation.…”

Section: Model Establishmentmentioning

confidence: 99%

Mechanical properties and environmental performance of seawater sea-sand self-compacting Concrete

Yang

Xie

et al. 2022

Advances in Structural Engineering

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Due to the constituted ingredients are both rich in reserves, seawater sea-sand self-compacting concrete (SWSS-SCC) today has been treated as an ideal material in constructing island and coastal structures. The technique feasibility of applying SWSS-SCC in real engineering has been recognized by investigating the material properties, but its environmental impacts (EIs) has rarely been concerned at current stage. Under such a background, a refined life cycle assessment model of SWSS-SCC was developed in this study based on the China’s latest production data. Life cycle phases considered include extracting and preparing raw materials, component material production, mixing concrete and transportation occurred in the whole processes. After verifying the model, the impacts of several factors like concrete curing method, fly ash incorporation content, sea-sand transportation distance and electricity generation approach, which have never been investigated before, on the energy cost and carbon dioxide equivalent emissions generated in manufacturing SWSS-SCC were discussed. The simulated results showed that: (a) Using seawater and sea-sand slightly increases the concrete’s compressive and tensile strengths. Replacing some cement with fly ash notably decreases the early-age strengths, but curing at 60°C can offset that effect. (b) Replacing fresh water and natural sand by sea-water and sand in Humen Town decreases the production EIs of SWSS-SCC. For this concrete, cement production and raw material transportation are the main contributors to the overall EIs. (c) During producing SWSS-SCC, using electricity generated from clean fuels can effectively reduce the system’s EI, but changing fuel used to fire the cement kiln has little effect. (d) High temperature curing to increase the fly ash content is not environmentally sound. Reducing the mixture’s water to binder ratio is more benefit for incorporating fly ash. (e) From an environmental evaluation view, applying SWSS-SCC is more ecological in island constructions than coastal buildings.

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Assessing the sustainability potential of alkali-activated concrete from electric arc furnace slag using the ECO2 framework

Cited by 44 publications

References 42 publications

Mechanical Properties and Uniaxial Compression Stress—Strain Relation of Recycled Coarse Aggregate Concrete after Carbonation

Mechanical Properties and Uniaxial Compression Stress—Strain Relation of Recycled Coarse Aggregate Concrete after Carbonation

Waste coal cement concrete for sustainable production

Mechanical properties and environmental performance of seawater sea-sand self-compacting Concrete

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