Thermal analysis testing and natural radioactivity characterization of kaolin as building material

Janković, Bojan; Janković, Marija; Marinović‐Cincović, Milena; Todorović, Dragana; Sarap, Nataša

doi:10.1007/s10973-018-7159-1

Cited by 10 publications

(4 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It can be seen from Figure 10 that the ranges of the external exposure index, internal exposure index, air absorbed dose rate, and annual effective dose rate of the clay samples from Location C were all the smallest. The ranges of the external exposure index, internal exposure index, air absorbed dose rate, and annual effective dose rate of the clay samples from the other three locations were all within the allowable ranges stated in the national standard, 39,40 but they were significantly different for the clays from the different locations. Therefore, using the XRF method to classify clays can also provide the numerical range of the radiation index, which can be used to indirectly evaluate the radiation index of the clay, providing a reliable basis for the development, processing, and use of clay minerals.…”

Section: Data Analysis and Sample Classificationmentioning

confidence: 71%

X‐ray spectral characteristics of typical clays in China and their application in clay classification

et al. 2023

View full text Add to dashboard Cite

The variety and content of minerals in clay determine its quality and use. The x‐ray fluorescence characteristics of seven elements, that is, Mg, Al, Si, K, Ca, Ti, and Fe, in clay samples were studied using the energy‐dispersive x‐ray fluorescence (EDXRF) method. The application of wavelet transform was used to analyze the overlapping peaks of the FeKα and MnKβ and the CaKα and KKβ spectral lines and to measure the spectral peak count rate and the content of seven elements. The weight of classified elements in clay was calculated through principal component analysis, and the clay samples from four clay‐producing areas were classified using the K‐means clustering method. The results showed that the accuracy of classification using the count rate of seven elements reached 97.73%. The average accuracy of the classification results of the content of seven elements reached 80.68%. A comparison of the results showed that the EDXRF spectral peak information provides a reliable scientific method for the identification and tracing of clay and its products. In addition, tracing the origin of clay and its products can also indirectly assess the radiation level and its impact on the radiation environment based on the radiation index test results.

show abstract

Section: Data Analysis and Sample Classificationmentioning

confidence: 71%

X‐ray spectral characteristics of typical clays in China and their application in clay classification

et al. 2023

View full text Add to dashboard Cite

show abstract

“…1 represents the XRD patterns for treated charcoals at carbonization temperatures of 500 C, 800 C and 1100 C. For each carbonization temperature, two diffraction peaks were obtained at angles (2q) of 23.38 and 43.18 . 31,32 The peak at 43.18 becomes prominent with the increasing carbonization temperature. In this whole XRD pattern, no sharp peak is noticed, which implies that the carbonized charcoal is amorphous in nature.…”

Section: Resultsmentioning

confidence: 99%

EMI shielding of ABS composites filled with different temperature-treated equal-quantity charcoals

et al. 2019

View full text Add to dashboard Cite

Acrylonitrile-butadiene-styrene (ABS) composites were prepared by dry mixing equal-quantity (20 wt%) charcoals treated at different temperatures followed by hot compression. Processing parameters were kept the same. Seven samples of the same charcoal were modified for carbonization at different temperatures varying from 500 C to 1100 C in steps of 100 C. Temperature treatment of charcoal crafts an increase in the conductivity of ABS composites, primarily accountable for the enhancement of shielding. The electromagnetic shielding effectiveness in the X-band (8.2-12.4 GHz) has been discovered to significantly increase for composites with ascending temperature-treated charcoals. An abrupt increase in the conductivity of ABS composites containing equal quantities of charcoal subjected to enhanced temperature treatments truly explains the effective absorption behaviour. The composite containing 1100 C temperature-treated charcoal shows absorption-dominated SE of $36.8 dB at 11.6GHz. Dielectric behaviour proclaims a decrease in dielectric loss (3 00 ) with an increase in the frequency.Besides this, the increased carbonization temperatures also show increased porosity and high dielectric losses. The scanning electron microscopy studies validate the increase in the porosity of charcoals due to the increase in the treatment temperature. The results are promising for the development of custommade shielding composites possessing equal quantities of charcoal treated at enhanced temperatures.

show abstract

“…Building materials can contain various amounts of naturally occurring radionuclides which contribute most to the population exposure through ionizing radiation. The external radiation hazard index, as well as radium equivalent activity, external absorbed gamma dose rate, and annual effective dose, can be determined based on measured activity concentration of natural radionuclides 226 Ra, 232 Th, and 40 K [25]. According to Temuujin et al [24], the activity concentration of natural radionuclides after alkali-activation for two different ashes have values of 37.8 Bq/kg and 54.8 Bq/kg for 226 Ra, 15.6 Bq/kg and 17.2 Bq/kg for 232 Th, and 831.4 Bq/kg and 884.9 Bq/kg for 40 K, respectively.…”

Section: Introductionmentioning

confidence: 99%

“…According to Temuujin et al [24], the activity concentration of natural radionuclides after alkali-activation for two different ashes have values of 37.8 Bq/kg and 54.8 Bq/kg for 226 Ra, 15.6 Bq/kg and 17.2 Bq/kg for 232 Th, and 831.4 Bq/kg and 884.9 Bq/kg for 40 K, respectively. The interest in measuring radioactivity in terms of activity concentrations of selected and commonly present elements in building materials is due to its health hazards [25].…”

Section: Introductionmentioning

confidence: 99%

Radiological and Structural Characterization of Raw and Alkali-Activated Wood Ash and Metakaolin Blends

et al. 2022

View full text Add to dashboard Cite

The aim of the presented research was to investigate the application possibility of wood ash and metakaolin to obtain alkali-activated materials as relatively new materials in the building industry. Thus, in order to assess the adequate use of these waste materials, structural and radiological characteristics should be considered. Until now, the focus has been on ash from thermal power plants produced by burning coal, but a large part of households in our country have individual fireplaces in which wood is used as the basic raw material; thus, it is very interesting to measure the activity concentration of radionuclide in wood ash as well as the possibility of reusing that ash for other purposes. All materials were studied, in terms of physical and chemical characteristics, by methods such as X-ray diffraction (XRD), Fourier transform infra-red (FTIR) spectroscopy, and scanning electron microscopy and energy-dispersive X-ray spectroscopy (SEM/EDS). XRD measurements of wood ash samples showed that it consists of calcite and larnite. FTIR spectroscopy revealed a polymeric Si–O–Al framework in alkali-activated materials and Si–O bonding bands corresponding to silicon dioxide. Determination of radionuclide content was performed by means of gamma-ray spectrometry. Results showed that the alkaline activation process led to the decrease in the activity concentration of radionuclides detected in the measured samples. External radiation hazard index (Hex) for wood ash was reduced by more than 50% after alkali activation. The results of activity concentration measurements in alkali-activated materials indicate potential for their safe application in building construction.

show abstract

Thermal analysis testing and natural radioactivity characterization of kaolin as building material

Cited by 10 publications

References 21 publications

X‐ray spectral characteristics of typical clays in China and their application in clay classification

X‐ray spectral characteristics of typical clays in China and their application in clay classification

EMI shielding of ABS composites filled with different temperature-treated equal-quantity charcoals

Radiological and Structural Characterization of Raw and Alkali-Activated Wood Ash and Metakaolin Blends

Contact Info

Product

Resources

About