Waste Slag from Heating Plants as a Partial Replacement for Cement in Mortar and Concrete Production. Part I—Physical–Chemical and Physical–Mechanical Characterization of Slag

Nedeljković, Andrijana; Stojmenović, Marija; Gulicovski, Jelena; Ristić, Nenad; Miličević, Sonja; Krstić, Jugoslav; Kragović, Milan

doi:10.3390/min10110992

Cited by 9 publications

(7 citation statements)

References 34 publications

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“…A constant weight reduction was observed with increasing temperature of the silica fume, with a final weight reduction of approximately 3.7 wt%. This is judged to be a weight reduction due to the dehydration reaction of adsorb and crystallized water (below 200°C), and combustion of carbon generated in the silica fume manufactured process [26,27]. In the case of Si sludge, a rapid weight increase was observed above 600°C, which is attributed to the oxidation reaction where Si combines with oxygen in the atmosphere [11,28].…”

Section: Resultsmentioning

confidence: 99%

Thermal properties of porous ceramics manufactured by direct foaming using silicon sludge and silica fume

Son

Kang

Kim

2021

Journal of Asian Ceramic Societies

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In this study, waste silica fume was used as the raw material for manufacturing porous ceramics, and its mechanical and thermal properties required for application as thermal insulators were studied. For pore formation with direct foaming, Si sludge (0.01, 0.05, and 0.1 wt%) and NaOH aqueous solution (14 N) were used as the foaming agents. The porous ceramics sintered at 900°C showed an apparent porosity of 85.9-89.8%, and the specimen with 0.1 wt% Si sludge showed the highest apparent porosity of 89.8% and a bulk density of 0.24 g/cm 3 . Scanning electron microscopy results showed that with increasing Si sludge substitution, an open pore structure was formed because of the increase in the pore size from several tens to several hundreds of micrometers. The compressive strength decreased from 3.82 to 2.11 MPa as the amount of added Si sludge increased from 0.01 to 0.1%, respectively. The thermal conductivity was less than 1.0 W•m −1 •K −1 in the temperature range of 25-800°C, and the specimen with 0.1 wt% Si sludge showed a low thermal conductivity of 0.2-0.6 W•m −1 •K −1 . The thermal expansion coefficients were 17.1-22.4 × 10 −6 /K in the temperature range of 25-800°C.

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Section: Resultsmentioning

confidence: 99%

Thermal properties of porous ceramics manufactured by direct foaming using silicon sludge and silica fume

Son

Kang

Kim

2021

Journal of Asian Ceramic Societies

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“…Ordinary Portland cement CEM I 42.5R (CRH, Popovac, Serbia) was used, with the chemical and mineralogical composition determined in previous research, as shown in Table 1 [38]. Solid state of selected waste vitreous enamels samples were converted to a liquid by appropriate treatment.…”

Section: Samplingmentioning

confidence: 99%

Possibility of Using Vitreous Enamel Waste in the Construction Industry as the Concept of Cleaner Production

et al. 2023

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Waste vitreous enamels from the heating device production process were used for partial replacement of cement in the mortar and concrete production industry. This waste, due to the high content of heavy metals, is classified as hazardous waste. At the same time, waste vitreous enamels possess pozzolanic activity and belong to class 15 (WEP—generated during the production process of heating devices, premix technology), that is 5 (WETM—generated during the production process of heating devices, classic technology) of pozzolanic materials. The purpose of this research was to develop new composites from these wastes to reduce the deposition of the toxic compounds and reduce their environmental impact. The chemical and physical-chemical characterization and pozzolanic activity of the raw waste materials were studied by a mixture of complementary methods, as well as physical-mechanical characterization and a leaching test of mortar and concrete composites. The results indicate that the replacement of cement with WEP up to 30%, or with WETM up to 20% does not significantly affect the quality of concrete in comparison to the quality of the reference concrete prepared with 100% cement. The leaching test showed no significant release of toxic elements for both obtained composites.

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“…The waste slag generated by the combustion of lignite was sampled from the landfill of the heating plant located in Valjevo, Serbia. The sampling was performed as it is described elsewhere [16]. Since in the plant there is no planned waste disposal, in order to get a more realistic picture in terms of the quality of waste material, samples were taken by the square method from different places so that material of different ages was included.…”

Section: Samplingmentioning

confidence: 99%

“…Table 1. The physical-chemical, chemical and mineralogical properties of the used cement, slag and silica fumes [16].…”

Section: Samplingmentioning

confidence: 99%

“…Based on the results of concrete consistency testing, it can be concluded that as the content of waste material increased, the size of the slump decreased significantly. This was due to the porosity and higher specific surface area (Table 1) of the waste material and its ability to retain water, thereby reducing the amount of free water in the concrete mixture, and thus the consistency [16,21,22]. The content of air entrained into fresh concrete increased with an increasing percentage of cement replacement with waste material.…”

Section: Physical-mechanical Characterization Of Mortar and Concretementioning

confidence: 99%

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Application of Lignite Combustion Waste Slag Generated in Heating Plants as a Partial Replacement for Cement. Part II: Physical–Mechanical and Physical–Chemical Characterization of Mortar and Concrete

et al. 2021

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The presented study is a continuation of the research with the aim of finding a useful value of hazardous waste slag generated by the combustion of lignite in heating plants and its application in the construction industry. The different amounts of cement (10, 15, 20 and 25%) were replaced with waste slag and silica fumes in mortars and concrete production. Detailed physical–mechanical characterization was performed on the mortar and concrete samples according to standard procedures. Test results indicated that the replacement of cement with slag and silica fumes reduces the physical and mechanical properties of mortar and concrete, but cement composites retained the required structural properties. If 15–20% is considered an acceptable level of compressive strength decrease, then it can be concluded that waste slag can be implemented in practice and be used as a construction material, with cement replacement in the maximal amount of 20% (17.8% of slag and 2.2% of silica fumes). On hardened mortar samples with maximal possible cement replacement (20%), physical–chemical characterizations were performed and included X-ray and infrared spectrophotometry, scanning electron microscopy, and thermal analysis. Results showed the absence of new phases and the presence of only those which were characteristic for starting samples, predominantly portlandite, quartz, calcite and calcium silicate-oxide.

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Waste Slag from Heating Plants as a Partial Replacement for Cement in Mortar and Concrete Production. Part I—Physical–Chemical and Physical–Mechanical Characterization of Slag

Cited by 9 publications

References 34 publications

Thermal properties of porous ceramics manufactured by direct foaming using silicon sludge and silica fume

Thermal properties of porous ceramics manufactured by direct foaming using silicon sludge and silica fume

Possibility of Using Vitreous Enamel Waste in the Construction Industry as the Concept of Cleaner Production

Application of Lignite Combustion Waste Slag Generated in Heating Plants as a Partial Replacement for Cement. Part II: Physical–Mechanical and Physical–Chemical Characterization of Mortar and Concrete

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