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Arnon Chaipanich - One of the best experts on this subject based on the ideXlab platform.
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Thermogravimetry analysis, compressive strength and thermal conductivity tests of non-autoclaved aerated Portland cement–fly ash–silica fume concrete
Journal of Thermal Analysis and Calorimetry, 2015Co-Authors: Chalermphan Narattha, Pailyn Thongsanitgarn, Arnon ChaipanichAbstract:This paper reports the investigated Thermogravimetry analysis, compressive strength and thermal conductivity tests of non-autoclaved aerated Portland cement–fly ash–silica fume concrete. The mixes were cured in water and air for 3, 7 and 28 days. Thermogravimetry results showed that calcium silicate hydrate (C–S–H), ettringite, gehlenite (C_2ASH_8), calcium hydroxide [Ca(OH)_2] and calcium carbonate (CaCO_3) phases were detected in all mixes. The compressive strength and thermal conductivity of aerated Portland cement–fly ash–silica fume concrete increased when compared with aerated Portland cement–fly ash concrete after 28 days. The compressive strength and thermal conductivity of aerated concrete cured in water had higher values than air-cured specimens. X-ray diffraction and Thermogravimetry showed that Ca(OH)_2 decreased with increased silica fume content. This is due to the increased pozzolanic reaction when compared with the Portland cement–fly ash mixes, which corresponds to an increase in compressive strength and thermal conductivity.
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Thermogravimetry analysis compressive strength and thermal conductivity tests of non autoclaved aerated portland cement fly ash silica fume concrete
Journal of Thermal Analysis and Calorimetry, 2015Co-Authors: Chalermphan Narattha, Pailyn Thongsanitgarn, Arnon ChaipanichAbstract:This paper reports the investigated Thermogravimetry analysis, compressive strength and thermal conductivity tests of non-autoclaved aerated Portland cement–fly ash–silica fume concrete. The mixes were cured in water and air for 3, 7 and 28 days. Thermogravimetry results showed that calcium silicate hydrate (C–S–H), ettringite, gehlenite (C2ASH8), calcium hydroxide [Ca(OH)2] and calcium carbonate (CaCO3) phases were detected in all mixes. The compressive strength and thermal conductivity of aerated Portland cement–fly ash–silica fume concrete increased when compared with aerated Portland cement–fly ash concrete after 28 days. The compressive strength and thermal conductivity of aerated concrete cured in water had higher values than air-cured specimens. X-ray diffraction and Thermogravimetry showed that Ca(OH)2 decreased with increased silica fume content. This is due to the increased pozzolanic reaction when compared with the Portland cement–fly ash mixes, which corresponds to an increase in compressive strength and thermal conductivity.
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Thermogravimetry of ternary cement blends
Journal of Thermal Analysis and Calorimetry, 2013Co-Authors: Watcharapong Wongkeo, Pailyn Thongsanitgarn, Prinya Chindaprasirt, Arnon ChaipanichAbstract:This study reports the microstructure characteristic and compressive strength of multi-blended cement under different curing methods. Fly ash, ground bottom ash, and undensified silica fume were used to replace part of cement at 50 % by mass. Mortar and paste specimens were cured in air at ambient temperature, water at 25, 40, and 60 °C and sealed with plastic sheeting for 28 days. In addition, these specimens were cured in an autoclave for 6, 9, and 12 h. Results indicated that the compressive strength of multi-blended mixes containing silica fume 10 % by mass cured with plastic sealed and cured in water at 25 and 40 °C was similar to or higher than the corresponding Portland cement control at 28 day. Moreover, the mixes containing silica fume 10 % by mass cured in water at 60 °C had higher compressive strength than Portland cement control. X-ray diffraction and Thermogravimetry results confirmed that there was increased pozzolanic reaction with increasing silica fume content which relates to the increasing in strength. For autoclaved curing, the compressive strength of multi-blended cement specimens with silica fume (total of 50 % replacement) was noticeably higher than control Portland cement mix and was highest when autoclaving time was 9 h. X-ray diffraction results showed the pattern of 0.9, 1.1, and 1.4 nm tobermorite crystalline phases as the main product of this curing. Thermogravimetry results showed dehydration of 1.4 nm tobermorite and 1.1 nm tobermorite at about 80–90 and 135–150 °C, respectively. Tobermorite (also shown by scanning electron microscope) thereby as a result lead to significant compressive strength improvement in the short time of autoclaved curing.
Chalermphan Narattha - One of the best experts on this subject based on the ideXlab platform.
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Thermogravimetry analysis, compressive strength and thermal conductivity tests of non-autoclaved aerated Portland cement–fly ash–silica fume concrete
Journal of Thermal Analysis and Calorimetry, 2015Co-Authors: Chalermphan Narattha, Pailyn Thongsanitgarn, Arnon ChaipanichAbstract:This paper reports the investigated Thermogravimetry analysis, compressive strength and thermal conductivity tests of non-autoclaved aerated Portland cement–fly ash–silica fume concrete. The mixes were cured in water and air for 3, 7 and 28 days. Thermogravimetry results showed that calcium silicate hydrate (C–S–H), ettringite, gehlenite (C_2ASH_8), calcium hydroxide [Ca(OH)_2] and calcium carbonate (CaCO_3) phases were detected in all mixes. The compressive strength and thermal conductivity of aerated Portland cement–fly ash–silica fume concrete increased when compared with aerated Portland cement–fly ash concrete after 28 days. The compressive strength and thermal conductivity of aerated concrete cured in water had higher values than air-cured specimens. X-ray diffraction and Thermogravimetry showed that Ca(OH)_2 decreased with increased silica fume content. This is due to the increased pozzolanic reaction when compared with the Portland cement–fly ash mixes, which corresponds to an increase in compressive strength and thermal conductivity.
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Thermogravimetry analysis compressive strength and thermal conductivity tests of non autoclaved aerated portland cement fly ash silica fume concrete
Journal of Thermal Analysis and Calorimetry, 2015Co-Authors: Chalermphan Narattha, Pailyn Thongsanitgarn, Arnon ChaipanichAbstract:This paper reports the investigated Thermogravimetry analysis, compressive strength and thermal conductivity tests of non-autoclaved aerated Portland cement–fly ash–silica fume concrete. The mixes were cured in water and air for 3, 7 and 28 days. Thermogravimetry results showed that calcium silicate hydrate (C–S–H), ettringite, gehlenite (C2ASH8), calcium hydroxide [Ca(OH)2] and calcium carbonate (CaCO3) phases were detected in all mixes. The compressive strength and thermal conductivity of aerated Portland cement–fly ash–silica fume concrete increased when compared with aerated Portland cement–fly ash concrete after 28 days. The compressive strength and thermal conductivity of aerated concrete cured in water had higher values than air-cured specimens. X-ray diffraction and Thermogravimetry showed that Ca(OH)2 decreased with increased silica fume content. This is due to the increased pozzolanic reaction when compared with the Portland cement–fly ash mixes, which corresponds to an increase in compressive strength and thermal conductivity.
Pailyn Thongsanitgarn - One of the best experts on this subject based on the ideXlab platform.
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Thermogravimetry analysis, compressive strength and thermal conductivity tests of non-autoclaved aerated Portland cement–fly ash–silica fume concrete
Journal of Thermal Analysis and Calorimetry, 2015Co-Authors: Chalermphan Narattha, Pailyn Thongsanitgarn, Arnon ChaipanichAbstract:This paper reports the investigated Thermogravimetry analysis, compressive strength and thermal conductivity tests of non-autoclaved aerated Portland cement–fly ash–silica fume concrete. The mixes were cured in water and air for 3, 7 and 28 days. Thermogravimetry results showed that calcium silicate hydrate (C–S–H), ettringite, gehlenite (C_2ASH_8), calcium hydroxide [Ca(OH)_2] and calcium carbonate (CaCO_3) phases were detected in all mixes. The compressive strength and thermal conductivity of aerated Portland cement–fly ash–silica fume concrete increased when compared with aerated Portland cement–fly ash concrete after 28 days. The compressive strength and thermal conductivity of aerated concrete cured in water had higher values than air-cured specimens. X-ray diffraction and Thermogravimetry showed that Ca(OH)_2 decreased with increased silica fume content. This is due to the increased pozzolanic reaction when compared with the Portland cement–fly ash mixes, which corresponds to an increase in compressive strength and thermal conductivity.
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Thermogravimetry analysis compressive strength and thermal conductivity tests of non autoclaved aerated portland cement fly ash silica fume concrete
Journal of Thermal Analysis and Calorimetry, 2015Co-Authors: Chalermphan Narattha, Pailyn Thongsanitgarn, Arnon ChaipanichAbstract:This paper reports the investigated Thermogravimetry analysis, compressive strength and thermal conductivity tests of non-autoclaved aerated Portland cement–fly ash–silica fume concrete. The mixes were cured in water and air for 3, 7 and 28 days. Thermogravimetry results showed that calcium silicate hydrate (C–S–H), ettringite, gehlenite (C2ASH8), calcium hydroxide [Ca(OH)2] and calcium carbonate (CaCO3) phases were detected in all mixes. The compressive strength and thermal conductivity of aerated Portland cement–fly ash–silica fume concrete increased when compared with aerated Portland cement–fly ash concrete after 28 days. The compressive strength and thermal conductivity of aerated concrete cured in water had higher values than air-cured specimens. X-ray diffraction and Thermogravimetry showed that Ca(OH)2 decreased with increased silica fume content. This is due to the increased pozzolanic reaction when compared with the Portland cement–fly ash mixes, which corresponds to an increase in compressive strength and thermal conductivity.
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Thermogravimetry of ternary cement blends
Journal of Thermal Analysis and Calorimetry, 2013Co-Authors: Watcharapong Wongkeo, Pailyn Thongsanitgarn, Prinya Chindaprasirt, Arnon ChaipanichAbstract:This study reports the microstructure characteristic and compressive strength of multi-blended cement under different curing methods. Fly ash, ground bottom ash, and undensified silica fume were used to replace part of cement at 50 % by mass. Mortar and paste specimens were cured in air at ambient temperature, water at 25, 40, and 60 °C and sealed with plastic sheeting for 28 days. In addition, these specimens were cured in an autoclave for 6, 9, and 12 h. Results indicated that the compressive strength of multi-blended mixes containing silica fume 10 % by mass cured with plastic sealed and cured in water at 25 and 40 °C was similar to or higher than the corresponding Portland cement control at 28 day. Moreover, the mixes containing silica fume 10 % by mass cured in water at 60 °C had higher compressive strength than Portland cement control. X-ray diffraction and Thermogravimetry results confirmed that there was increased pozzolanic reaction with increasing silica fume content which relates to the increasing in strength. For autoclaved curing, the compressive strength of multi-blended cement specimens with silica fume (total of 50 % replacement) was noticeably higher than control Portland cement mix and was highest when autoclaving time was 9 h. X-ray diffraction results showed the pattern of 0.9, 1.1, and 1.4 nm tobermorite crystalline phases as the main product of this curing. Thermogravimetry results showed dehydration of 1.4 nm tobermorite and 1.1 nm tobermorite at about 80–90 and 135–150 °C, respectively. Tobermorite (also shown by scanning electron microscope) thereby as a result lead to significant compressive strength improvement in the short time of autoclaved curing.
P Tovari - One of the best experts on this subject based on the ideXlab platform.
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Thermogravimetry mass spectrometry analysis of energy crops
Journal of Thermal Analysis and Calorimetry, 2007Co-Authors: Erika Meszaros, Emma Jakab, Gabor Varhegyi, P TovariAbstract:The aim of this work was to study the thermal decomposition of different plant species obtained from energy plantations. Thermogravimetry/ mass spectrometry (TG/MS) experiments have been performed with two herbaceous crops (Miscanthus sinensis, pelletized energy grass) and two wood samples (willow, water locust) in inert and oxidative atmospheres. Owing to the large number of data obtained in the experiments, a chemometric tool, principal component analysis (PCA) has been used to help the interpretation of the results. It has been found that the thermal decomposition of the studied wood species is similar, whereas that of the studied herbaceous samples exhibits significant differences. PCA has been found to be useful for finding correlations between the various experimental data.
Duncan M. Price - One of the best experts on this subject based on the ideXlab platform.
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Vapor pressure determination by Thermogravimetry
Thermochimica Acta, 2001Co-Authors: Duncan M. PriceAbstract:A method for measuring the vapor pressures of a wide range of materials using a conventional thermobalance and standard sample holders is described. The equipment is calibrated using pure reference materials of known vapor pressure and exploiting the relationship between volatilization rate and vapor pressure based on the Langmuir equation for free evaporation. Enthalpies of vaporization and sublimation can be determined, in some cases, the melting temperature and enthalpy of fusion can be obtained directly from Thermogravimetry. Applications to the study of plasticizers and UV absorbers are described. Poor correlation of experimental results with predicted values obtained by molecular modeling is found. The application of modulated temperature Thermogravimetry for the determination of enthalpies of sublimation and vaporization is also explored.
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calorimetry of two disperse dyes using Thermogravimetry
Thermochimica Acta, 1998Co-Authors: Duncan M. Price, Michael HawkinsAbstract:A method for studying the volatilisation rate of materials using a conventional thermobalance and standard sample holders is described. This was used to study two dyes; CI Disperse Yellow 54 and CI Disperse Red 60. Using pure reference materials, a relationship between volatilisation rate and vapour pressure based on the Langmuir equation for free evaporation was used to calibrate the system. Thus, the vapour pressures of the dyes could be determined. Heats of sublimation and vaporisation were calculated from a plot of the logarithm of the vapour pressure against reciprocal absolute temperature. Extrapolation of the vapour pressure vs. temperature curve outside the experimentally measured region for Red 60 was made using the melting point and heat of fusion found by DSC. Good agreement was found with literature data. In favourable cases, the melting temperature and heat of fusion can be obtained directly from Thermogravimetry.
