Cementing efficiency of electric arc furnace dust in mortars

Magalhães, Margareth da Silva; Faleschini, Flora; Pellegrino, Carlo; Brunelli, Katya

doi:10.1016/j.conbuildmat.2017.09.074

Cited by 47 publications

(12 citation statements)

References 45 publications

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“…Traditional building materials, such as concrete, are increasingly being replaced with advanced composite materials in accordance with the principles of sustainability in civil engineering. One of the options involves a partial replacement of cement with active cementitious substances, such as mineral or industrial solid byproducts and wastes (metakaolin, coal and municipal solid waste fly-ash, agro-technical ash, quarry dust, blast furnace slag and reservoir sediments) [8][9][10][11][12][13]. This practice is favorable to the industry, resulting in a concrete that has lower costs and environmental impact, and greater long-term strength, and durability [14].…”

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confidence: 99%

Sustainable Bio-Aggregate-Based Composites Containing Hemp Hurds and Alternative Binder

et al. 2018

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This experimental study was focused on the application of a surface-modified hemphurds aggregate into composites using an alternative binder of MgO-cement. This paper presents the results of the comparative study of the parameters (chemical and physico-chemical modification, and hardening time) affecting the physical (density, thermal conductivity coefficient and water-absorption behavior) and mechanical properties (compressive strength) of the bio-aggregate-based composite. A test of the parameters of the bio-composite samples showed some differences, which were determined by the chemical and surface properties of the modified filler, and which affected the mechanisms of hardening. The bulk density values of the hemp hurd composites hardened for 28 days place this material in the lightweight category of composites. The values of water absorption and the thermal conductivity coefficient of bio-composites decreased, and the strength parameter increased with an increase in the hardening time. The lower values of compressive strength, water absorption, and thermal conductivity coefficient (except for the ethylenediaminetetraacetic-acid-treated filler) were observed in composites based on fillers chemically treated with NaOH and Ca(OH) 2 ) compared to referential composites (based on original hemp hurds). This is related to changes in the chemical composition of hemp hurds after chemical modification. The composites with ultrasound-treated hemp hurds had the greatest strengths at each hardening time. This is related to pulping the bundles of fibers and forming a larger surface area for bonding in the matrix. demand for natural fibers is growing worldwide and its price is increasing, it is still significantly lower than that of synthetic fibers; these plants need further research with respect to the opportunities for their use, and to provide novel products with improved properties. Among a wide variety of lignocellulosic material sources, a great importance is given to technical hemp (Cannabis Sativa) for its application in bio-composites. Industrial hemp is becoming a major focus of the green housing segment because of its energy-efficient cultivation, and because hemp-based composites have no negative effects on human health [5]. The excellent physical and mechanical properties of hemp, including low density, high specific stiffness and strength, biodegradability, sound absorption, low processing costs and the ecological suitability of this fast-growing, carbon-negative and non-toxic plant, predispose it for use in building materials (bio-composites) based on inorganic matrices [6], mainly for their application in the housing construction [7]. Traditional building materials, such as concrete, are increasingly being replaced with advanced composite materials in accordance with the principles of sustainability in civil engineering. One of the options involves a partial replacement of cement with active cementitious substances, such as mineral or industrial solid byproducts and wastes (metakaolin, coal and municipal s...

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Sustainable Bio-Aggregate-Based Composites Containing Hemp Hurds and Alternative Binder

et al. 2018

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“…In the literature, a low W/C value of 0.38 was used. However, a similar industrial mineral admixture, electric arc furnace dust, has high hydration activity with W/C values from 0.35 to 0.7 [34]. Hence, the W/C of 0.5 used in this study is not the main cause of the low hydration activity.…”

Section: Strength Properties Of Mortar and Concretementioning

confidence: 85%

MSWI Bottom Ash Application to Resist Sulfate Attack on Concrete

et al. 2019

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This research provides a strategy for partially replacing cement with municipal solid waste incineration (MSWI) bottom ash (BA) to improve the performance of concrete against sulphate attack. Mortar strength tests were performed firstly to evaluate the hydration activity of the ground BA. Concrete specimens were cured in standard conditions and immersed in a solution that contained 10% sodium sulfate. Then, the compressive strength of these specimens was measured to investigate the mechanical properties and durability of the concrete. Next, the capillary porosity of the concrete was determined from the volume fractions of water lost in specimens. Finally, the transport of the sulphate solution in concrete was analyzed using capillary rise, crystallization rate, and solution absorption tests. The results indicated that BA had a certain hydration activity. The equivalent replacement of cement by BA decreased the compressive strength of the specimens but increased the durability of the concrete. There was an excellent correlation between capillary rise height, sulfate solution absorption amount, crystallization rate, and coarse capillary porosity. The addition of BA can decrease the coarse capillary porosity and further slow the capillary transport and crystallization of sulfate solution in concrete. Overall, the replacement of cement with BA can improve the durability of concrete and actualize the utilization of MSWI residues as a resource.

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“…Other eight pastes mixtures with six alkali (0.59-4.31% Na2Oe by mass of overall binder) content and three EAFD (5% -20%) amounts were also prepared, maintaining a fixed water/overall binder (w/b) ratio of 0.35. Cement and EAFD were considered as binder (b) to calculate the water content without considering dust efficiency (Magalhães et al 2017b). The paste mixture with the lowest alkali content (0.59% Na2Oe by mass of overall binder) was prepared using the original cement.…”

Section: Mixture Detailsmentioning

confidence: 99%

Effect of water and alkali content on setting time of cement pastes with electric arc furnace dust (EAFD)

Magalhães¹,

Faleschini²,

Pellegrino³

et al. 2019

Sustainable Construction Materials and Technologies (SCMT)

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This study was undertaken to provide additional information about the effects of varying water-binder ratio (0.30-0.55) and electric arc furnace dust (EAFD) content (up to 20%) on setting times of blended cements. A study about the influence of total alkali content on setting time of blended cement was also conducted as an attempt to identify an efficient pre-treatment system to solve the retardation influence of such dust on setting time. Results indicate that the use of low w/b ratio is effective in shortening the setting time of blended cements, limiting the setting time below 24 h in most of the analysed mixtures. Increasing the alkali content was also effective on shortening the setting time of blended pastes. Final setting time of pastes with 10% and 20% EAFD was less than 6 hours, and when the EAFD content was 5%, setting times was almost the same of the cement paste.

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Cementing efficiency of electric arc furnace dust in mortars

Cited by 47 publications

References 45 publications

Sustainable Bio-Aggregate-Based Composites Containing Hemp Hurds and Alternative Binder

Sustainable Bio-Aggregate-Based Composites Containing Hemp Hurds and Alternative Binder

MSWI Bottom Ash Application to Resist Sulfate Attack on Concrete

Effect of water and alkali content on setting time of cement pastes with electric arc furnace dust (EAFD)

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