Characterization of radionuclides present in portland cement, gypsum and phosphogypsum mortars

Narloch, Danielle Cristine; Paschuk, S.A.; Corrêa, Janine Nicolosi; Rocha, Zildete; Mazer, Wellington; Torres, Catarina Alzira Montenegro Peddis; Claro, Flávia Del; Denyak, V.; Schelin, H.R.

doi:10.1016/j.radphyschem.2018.07.011

Cited by 20 publications

(2 citation statements)

References 7 publications

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“…The levels of activity concentration of 222 Rn and 226 Ra present in Portland cement mortar, including the samples of the main compounds of Portland cement such as phosphogypsum and natural gypsum mortars were reported previously [11]. These values were found over 300 Bqm −3 of 222 Rn activity concentration in the air in Portland cement mortar.…”

Section: Methodssupporting

confidence: 59%

Elementary characterization of samples of Portland cement, natural gypsum and phosphogypsum mortars from Brazil

et al. 2019

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Portland cement, the basic ingredient of concrete and is manufactured by crushing, milling and proportioning limestone, sand, clay, iron ore and secondary materials such as shells, chalk or marl combined with shale slate or blast furnace slag, fly ash, gypsum, phosphogypsum, and some others. Evaluating the physical and mineralogical characteristics of the cement and its chemical composition is essential to establish the quality of the product. Therefore, the objective of this work was to characterize and quantify the most common chemical elements in the samples of Brazilian Portland cement, natural gypsum, and phosphogypsum mortars by means of X-ray dispersive energy spectroscopy (EDXRF), as well as to evaluate the strength of these mortars. For analysis of the compressive strength, initially prepared samples were submitted to a destructive mechanical test. Subsequently samples were milled and compacted to form thin tablets, which were submitted to the EDXRF analysis. The qualitative and quantitative analyzes showed that for phosphogypsum mortar the largest mass fractions were found of 49.8±2.5% (Si), 24.66±0.96% (S) and 22.10±0.42% (Ca). For gypsum mortar those values were found of 43.41±0.45% (Ca), 33.8 ± 0.8% (S) and 18.9±1.2% (Si), respectively; and for Portland cement mortar, the predominant elements in those samples have the mass fractions of 64.20±0.52% (Ca) and 27.3±1.5% (Si). The results showed that obtained values of mass fraction of the elements Si, S, K, Ca, Ti, Fe are in rather good agreement with quantities indicated for manufacture. Besides, gypsum and phosphogypsum presented almost the same composition and compressive strength.

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Section: Methodssupporting

confidence: 59%

Elementary characterization of samples of Portland cement, natural gypsum and phosphogypsum mortars from Brazil

et al. 2019

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“…3 and 4 that the mechanical strengths decrease linearly with the increasing foam volume. This is attributed to the fact that the increased foam volume can lead to increasing the internal porosity of phosphogypsum, thus decreasing the mechanical strengths [28,29]. However, the addition of cement can improve the compactness of the microstructures of phosphogypsum, thus improving the mechanical strengths [30,31].…”

Section: Water Resistancementioning

confidence: 99%

Research on the Thermal Conductivity and Water Resistance of Foamed Phosphogypsum

2021

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Phosphogypsum is a kind of solid waste which pollutes the environment without reasonable treatment. The application of phosphogypsum in the field of building materials provides an ideal method to solve this problem. Meanwhile, the phosphogypsum mixed with foam can be used for the thermal insulation of wall materials. This paper aims to study the influence of foam volume and cement content on the thermal conductivity, water resistance coefficient and the mechanical strengths of foamed phosphogypsum. The volume of foam in this study ranged from 0% to 60%. Moreover, the influences of humidity and cement content on the mechanical strengths of phosphogypsum are investigated. Scanning electron microscope and the mercury intrusion porosimetry are used for the microscale research and analysis. Results indicate that the relationships between the parameters (thermal conductivity, water resistance coefficient and mechanical strengths) and foam volume fit well with a negatively correlated linear function. The addition of cement can improve the compactness of phosphogypsum and decrease the diameter and volume of pores. Therefore, the thermal conductivity, water resistance coefficient and mechanical strengths of phosphogypsum are increased by the addition of cement.

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Radioactivity of building materials in Serbia and assessment of radiological hazard of gamma radiation and radon exhalation

Kuzmanović

Todorović

Petrović

et al. 2020

J Radioanal Nucl Chem

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Characterization of radionuclides present in portland cement, gypsum and phosphogypsum mortars

Cited by 20 publications

References 7 publications

Elementary characterization of samples of Portland cement, natural gypsum and phosphogypsum mortars from Brazil

Elementary characterization of samples of Portland cement, natural gypsum and phosphogypsum mortars from Brazil

Research on the Thermal Conductivity and Water Resistance of Foamed Phosphogypsum

Radioactivity of building materials in Serbia and assessment of radiological hazard of gamma radiation and radon exhalation

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