The Experts below are selected from a list of 3924 Experts worldwide ranked by ideXlab platform
Mingzhong Zhang - One of the best experts on this subject based on the ideXlab platform.
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Mechanical and thermal properties of graphene sulfonate nanosheet reinforced sacrificial concrete at elevated temperatures
Construction and Building Materials, 2017Co-Authors: Hong-yan Chu, Jinyang Jiang, Wei Sun, Mingzhong ZhangAbstract:Progress in the field of nanomaterials presents an opportunity to improve the performance of cementitious composites via graphene or its derivatives. This paper presents an experimental study on mechanical and thermal properties of sacrificial concrete without and with graphene sulfonate nanosheets (GSNSs) during high temperature exposure. The microstructure, porosity, mechanical strengths, thermal analysis, coefficient of thermal expansion, thermal diffusivity and ablation behaviour of sacrificial concrete during exposure to various temperatures up to 1000 °C were comprehensively investigated. Two new experimental apparatuses were developed and used to measure mechanical strengths of sacrificial concrete at elevated temperatures. It was found that the compressive strength, splitting tensile strength, thermal diffusivity and Decomposition Enthalpy of sacrificial concrete were increased by 12.98–25.36%, 8.66–34.38%, 25.00–103.23% and 4.23% respectively when adding 0.1 wt% GSNSs, while the porosity and ablation velocity of sacrificial concrete were reduced by 3.01–6.99% and 4.14% respectively due to the incorporation of GSNSs.
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Effects of graphene sulfonate nanosheets on mechanical and thermal properties of sacrificial concrete during high temperature exposure
Cement and Concrete Composites, 2017Co-Authors: Hong-yan Chu, Jinyang Jiang, Wei Sun, Mingzhong ZhangAbstract:Abstract Using nanomaterials is a new method to improve concrete material, and graphene or its derivatives are currently the most attractive nanomaterials. This paper aims to experimentally evaluate the effects of graphene sulfonate nanosheets (GSNSs) on physical, mechanical, and thermal properties of sacrificial concrete. The microstructure, porosity, compressive strength, thermal analysis, coefficient of thermal expansion, thermal diffusivity and ablation behaviour of sacrificial concrete with different contents of GSNSs before and during exposure to various temperatures up to 1000 °C were comprehensively investigated. A new experimental apparatus was proposed and used to measure the compressive strength of sacrificial concrete during elevated temperature exposure. It was found that, (1) the compressive strength, thermal diffusivity, and Decomposition Enthalpy of sacrificial concrete increased by 10.14–23.11%, 6.51–27.66%, and 7.48%, respectively, when adding 0.1 wt% GSNSs; (2) the porosity and ablation velocity of sacrificial concrete reduced by 2.00–6.00% and 7.48%, respectively, due to the incorporation of GSNSs.
Hong-yan Chu - One of the best experts on this subject based on the ideXlab platform.
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Mechanical properties and ablation behaviour of nuclear sacrificial materials containing graphene sulfonate nanosheets
Construction and Building Materials, 2018Co-Authors: Hong-yan Chu, Jinyang Jiang, Jinhui Tang, Zhifeng ZhangAbstract:Abstract Graphene and its derivatives have been attracting the widespread interest of researchers because of their capability to improve several properties (e.g. mechanical properties, durability, anti-corrosion) of cementitious composites. This paper presents an experimental study on the influence of graphene sulfonate nanosheets (GSNSs) on mechanical properties and ablation behaviour of ferro-siliceous sacrificial cement paste and mortar, including flexural strength, compressive strength, microstructure, porosity, and thermal properties. Based on the results of differential scanning calorimetry and Decomposition temperatures, the Decomposition Enthalpy of ferro-siliceous sacrificial cement paste and mortar was determined. It was found that, (1) the flexural strength and compressive strength of ferro-siliceous sacrificial mortar were increased by 16.22% and 24.44% respectively with the addition of 0.1 wt% GSNSs; (2) the Decomposition Enthalpy of ferro-siliceous sacrificial mortar was increased by 14.65%, 101.33%, and 135.15%, when adding 0.03 wt%, 0.1 wt%, and 0.3 wt% GSNSs, respectively; (3) the optimum GSNSs content was 0.1 wt% considering the mechanical strength, microstructure, and ablation rate of ferro-siliceous sacrificial cement paste and mortar. These findings can guide the design of ferro-siliceous sacrificial composites, e.g., cement paste, mortar, and even concrete containing GSNSs.
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Mechanical and thermal properties of graphene sulfonate nanosheet reinforced sacrificial concrete at elevated temperatures
Construction and Building Materials, 2017Co-Authors: Hong-yan Chu, Jinyang Jiang, Wei Sun, Mingzhong ZhangAbstract:Progress in the field of nanomaterials presents an opportunity to improve the performance of cementitious composites via graphene or its derivatives. This paper presents an experimental study on mechanical and thermal properties of sacrificial concrete without and with graphene sulfonate nanosheets (GSNSs) during high temperature exposure. The microstructure, porosity, mechanical strengths, thermal analysis, coefficient of thermal expansion, thermal diffusivity and ablation behaviour of sacrificial concrete during exposure to various temperatures up to 1000 °C were comprehensively investigated. Two new experimental apparatuses were developed and used to measure mechanical strengths of sacrificial concrete at elevated temperatures. It was found that the compressive strength, splitting tensile strength, thermal diffusivity and Decomposition Enthalpy of sacrificial concrete were increased by 12.98–25.36%, 8.66–34.38%, 25.00–103.23% and 4.23% respectively when adding 0.1 wt% GSNSs, while the porosity and ablation velocity of sacrificial concrete were reduced by 3.01–6.99% and 4.14% respectively due to the incorporation of GSNSs.
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Effects of graphene sulfonate nanosheets on mechanical and thermal properties of sacrificial concrete during high temperature exposure
Cement and Concrete Composites, 2017Co-Authors: Hong-yan Chu, Jinyang Jiang, Wei Sun, Mingzhong ZhangAbstract:Abstract Using nanomaterials is a new method to improve concrete material, and graphene or its derivatives are currently the most attractive nanomaterials. This paper aims to experimentally evaluate the effects of graphene sulfonate nanosheets (GSNSs) on physical, mechanical, and thermal properties of sacrificial concrete. The microstructure, porosity, compressive strength, thermal analysis, coefficient of thermal expansion, thermal diffusivity and ablation behaviour of sacrificial concrete with different contents of GSNSs before and during exposure to various temperatures up to 1000 °C were comprehensively investigated. A new experimental apparatus was proposed and used to measure the compressive strength of sacrificial concrete during elevated temperature exposure. It was found that, (1) the compressive strength, thermal diffusivity, and Decomposition Enthalpy of sacrificial concrete increased by 10.14–23.11%, 6.51–27.66%, and 7.48%, respectively, when adding 0.1 wt% GSNSs; (2) the porosity and ablation velocity of sacrificial concrete reduced by 2.00–6.00% and 7.48%, respectively, due to the incorporation of GSNSs.
T. G. Srinivasan - One of the best experts on this subject based on the ideXlab platform.
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Calorimetric studies on the thermal Decomposition of tri n-butyl phosphate-nitric acid systems
Journal of Thermal Analysis and Calorimetry, 2012Co-Authors: K. Chandran, Tarun Kumar Sahoo, P. Muralidaran, V. Ganesan, T. G. SrinivasanAbstract:Thermal Decomposition of neat TBP, acid-solvates (TBP·1.1HNO_3, TBP·2.4HNO_3) (prepared by equilibrating neat TBP with 8 and 15.6 M nitric acid) with and without the presence of additives such as uranyl nitrate, sodium nitrate and sodium nitrite, mixtures of neat TBP and nitric acid of different acidities, 1.1 M TBP solutions in diluents such as n -dodecane ( n -DD), n -octane and isooctane has been studied using an adiabatic calorimeter. Enthalpy change and the activation energy for the Decomposition reaction derived from the calorimetric data wherever possible are reported in this article. Neat TBP was found to be stable up to 255 °C, whereas the acid-solvates TBP·1.1HNO_3 and TBP·2.4HNO_3 decomposed at 120 and 111 °C, respectively, with a Decomposition Enthalpy of −495.8 ± 10.9 and −1115.5 ± 8.2 kJ mol^−1 of TBP. Activation energy and pre exponential factor derived from the calorimetric data for the Decomposition of these acid-solvates were found be 108.8 ± 3.7, 103.5 ± 1.4 kJ mol^−1 of TBP and 6.1 × 10^10 and 5.6 × 10^9 S^−1, respectively. The thermochemical parameters such as, the onset temperature, Enthalpy of Decomposition, activation energy and the pre-exponential factor were found to strongly depend on acid-solvate stoichiometry. Heat capacity ( C _ p ), of neat TBP and the acid-solvates (TBP·1.1HNO_3 and TBP·2.4HNO_3) were measured at constant pressure using heat flux type differential scanning calorimeter (DSC) in the temperature range 32–67 °C. The values obtained at 32 °C for neat TBP, acid-solvates TBP·1.1HNO_3 and TBP·2.4HNO_3 are 1.8, 1.76 and 1.63 J g^−1 K^−1, respectively. C _ p of neat TBP, 1.82 J g^−1 K^−1, was also measured at 27 °C using ‘hot disk’ method and was found to agree well with the values obtained by DSC method.
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Calorimetric studies on the thermal Decomposition of tri n -butyl phosphate-nitric acid systems
Journal of Thermal Analysis and Calorimetry, 2011Co-Authors: K. Chandran, Tarun Kumar Sahoo, P. Muralidaran, V. Ganesan, T. G. SrinivasanAbstract:Abstract Thermal Decomposition of neat TBP, acid-solvates (TBP·1.1HNO3, TBP·2.4HNO3) (prepared by equilibrating neat TBP with 8 and 15.6 M nitric acid) with and without the presence of additives such as uranyl nitrate, sodium nitrate and sodium nitrite, mixtures of neat TBP and nitric acid of different acidities, 1.1 M TBP solutions in diluents such as n-dodecane (n-DD), n-octane and isooctane has been studied using an adiabatic calorimeter. Enthalpy change and the activation energy for the Decomposition reaction derived from the calorimetric data wherever possible are reported in this article. Neat TBP was found to be stable up to 255 °C, whereas the acid-solvates TBP·1.1HNO3 and TBP·2.4HNO3 decomposed at 120 and 111 °C, respectively, with a Decomposition Enthalpy of −495.8 ± 10.9 and −1115.5 ± 8.2 kJ mol−1 of TBP. Activation energy and pre exponential factor derived from the calorimetric data for the Decomposition of these acid-solvates were found be 108.8 ± 3.7, 103.5 ± 1.4 kJ mol−1 of TBP and 6.1 × 10...
Jinyang Jiang - One of the best experts on this subject based on the ideXlab platform.
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Mechanical properties and ablation behaviour of nuclear sacrificial materials containing graphene sulfonate nanosheets
Construction and Building Materials, 2018Co-Authors: Hong-yan Chu, Jinyang Jiang, Jinhui Tang, Zhifeng ZhangAbstract:Abstract Graphene and its derivatives have been attracting the widespread interest of researchers because of their capability to improve several properties (e.g. mechanical properties, durability, anti-corrosion) of cementitious composites. This paper presents an experimental study on the influence of graphene sulfonate nanosheets (GSNSs) on mechanical properties and ablation behaviour of ferro-siliceous sacrificial cement paste and mortar, including flexural strength, compressive strength, microstructure, porosity, and thermal properties. Based on the results of differential scanning calorimetry and Decomposition temperatures, the Decomposition Enthalpy of ferro-siliceous sacrificial cement paste and mortar was determined. It was found that, (1) the flexural strength and compressive strength of ferro-siliceous sacrificial mortar were increased by 16.22% and 24.44% respectively with the addition of 0.1 wt% GSNSs; (2) the Decomposition Enthalpy of ferro-siliceous sacrificial mortar was increased by 14.65%, 101.33%, and 135.15%, when adding 0.03 wt%, 0.1 wt%, and 0.3 wt% GSNSs, respectively; (3) the optimum GSNSs content was 0.1 wt% considering the mechanical strength, microstructure, and ablation rate of ferro-siliceous sacrificial cement paste and mortar. These findings can guide the design of ferro-siliceous sacrificial composites, e.g., cement paste, mortar, and even concrete containing GSNSs.
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Mechanical and thermal properties of graphene sulfonate nanosheet reinforced sacrificial concrete at elevated temperatures
Construction and Building Materials, 2017Co-Authors: Hong-yan Chu, Jinyang Jiang, Wei Sun, Mingzhong ZhangAbstract:Progress in the field of nanomaterials presents an opportunity to improve the performance of cementitious composites via graphene or its derivatives. This paper presents an experimental study on mechanical and thermal properties of sacrificial concrete without and with graphene sulfonate nanosheets (GSNSs) during high temperature exposure. The microstructure, porosity, mechanical strengths, thermal analysis, coefficient of thermal expansion, thermal diffusivity and ablation behaviour of sacrificial concrete during exposure to various temperatures up to 1000 °C were comprehensively investigated. Two new experimental apparatuses were developed and used to measure mechanical strengths of sacrificial concrete at elevated temperatures. It was found that the compressive strength, splitting tensile strength, thermal diffusivity and Decomposition Enthalpy of sacrificial concrete were increased by 12.98–25.36%, 8.66–34.38%, 25.00–103.23% and 4.23% respectively when adding 0.1 wt% GSNSs, while the porosity and ablation velocity of sacrificial concrete were reduced by 3.01–6.99% and 4.14% respectively due to the incorporation of GSNSs.
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Effects of graphene sulfonate nanosheets on mechanical and thermal properties of sacrificial concrete during high temperature exposure
Cement and Concrete Composites, 2017Co-Authors: Hong-yan Chu, Jinyang Jiang, Wei Sun, Mingzhong ZhangAbstract:Abstract Using nanomaterials is a new method to improve concrete material, and graphene or its derivatives are currently the most attractive nanomaterials. This paper aims to experimentally evaluate the effects of graphene sulfonate nanosheets (GSNSs) on physical, mechanical, and thermal properties of sacrificial concrete. The microstructure, porosity, compressive strength, thermal analysis, coefficient of thermal expansion, thermal diffusivity and ablation behaviour of sacrificial concrete with different contents of GSNSs before and during exposure to various temperatures up to 1000 °C were comprehensively investigated. A new experimental apparatus was proposed and used to measure the compressive strength of sacrificial concrete during elevated temperature exposure. It was found that, (1) the compressive strength, thermal diffusivity, and Decomposition Enthalpy of sacrificial concrete increased by 10.14–23.11%, 6.51–27.66%, and 7.48%, respectively, when adding 0.1 wt% GSNSs; (2) the porosity and ablation velocity of sacrificial concrete reduced by 2.00–6.00% and 7.48%, respectively, due to the incorporation of GSNSs.
Wei Sun - One of the best experts on this subject based on the ideXlab platform.
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Mechanical and thermal properties of graphene sulfonate nanosheet reinforced sacrificial concrete at elevated temperatures
Construction and Building Materials, 2017Co-Authors: Hong-yan Chu, Jinyang Jiang, Wei Sun, Mingzhong ZhangAbstract:Progress in the field of nanomaterials presents an opportunity to improve the performance of cementitious composites via graphene or its derivatives. This paper presents an experimental study on mechanical and thermal properties of sacrificial concrete without and with graphene sulfonate nanosheets (GSNSs) during high temperature exposure. The microstructure, porosity, mechanical strengths, thermal analysis, coefficient of thermal expansion, thermal diffusivity and ablation behaviour of sacrificial concrete during exposure to various temperatures up to 1000 °C were comprehensively investigated. Two new experimental apparatuses were developed and used to measure mechanical strengths of sacrificial concrete at elevated temperatures. It was found that the compressive strength, splitting tensile strength, thermal diffusivity and Decomposition Enthalpy of sacrificial concrete were increased by 12.98–25.36%, 8.66–34.38%, 25.00–103.23% and 4.23% respectively when adding 0.1 wt% GSNSs, while the porosity and ablation velocity of sacrificial concrete were reduced by 3.01–6.99% and 4.14% respectively due to the incorporation of GSNSs.
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Effects of graphene sulfonate nanosheets on mechanical and thermal properties of sacrificial concrete during high temperature exposure
Cement and Concrete Composites, 2017Co-Authors: Hong-yan Chu, Jinyang Jiang, Wei Sun, Mingzhong ZhangAbstract:Abstract Using nanomaterials is a new method to improve concrete material, and graphene or its derivatives are currently the most attractive nanomaterials. This paper aims to experimentally evaluate the effects of graphene sulfonate nanosheets (GSNSs) on physical, mechanical, and thermal properties of sacrificial concrete. The microstructure, porosity, compressive strength, thermal analysis, coefficient of thermal expansion, thermal diffusivity and ablation behaviour of sacrificial concrete with different contents of GSNSs before and during exposure to various temperatures up to 1000 °C were comprehensively investigated. A new experimental apparatus was proposed and used to measure the compressive strength of sacrificial concrete during elevated temperature exposure. It was found that, (1) the compressive strength, thermal diffusivity, and Decomposition Enthalpy of sacrificial concrete increased by 10.14–23.11%, 6.51–27.66%, and 7.48%, respectively, when adding 0.1 wt% GSNSs; (2) the porosity and ablation velocity of sacrificial concrete reduced by 2.00–6.00% and 7.48%, respectively, due to the incorporation of GSNSs.
