Pub Date : 2019-08-18DOI: 10.1504/IJMMP.2019.10023321
P. H. Kien
The present work investigates the crystal-amorphous phase transition and morphologies of metal nanoparticles Fe (NPs) using means of molecular dynamics (MD) simulation. Tracing the number of crystal atoms and the analysis of radial distribution functions, we found that the amorphous Fe NP is transformed into bcc crystal one when it was annealed for long times at 900 K. At the early stage of the annealing, small nuclei form in different places of NP and dissolve for short times. After long times some nuclei form and gather nearby which creates the stable clusters in the core of NP and to spread into the surface of NP. Based on the mean potential energy per atom analysis and MD data visualisation technique, the effect of B atoms that prevent the growth of crystallisation as well as the different morphologies of Fe and FeB NPs have been investigated in detail.
{"title":"Study of crystal-amorphous phase transition and morphologies of metal nanoparticle Fe under annealing","authors":"P. H. Kien","doi":"10.1504/IJMMP.2019.10023321","DOIUrl":"https://doi.org/10.1504/IJMMP.2019.10023321","url":null,"abstract":"The present work investigates the crystal-amorphous phase transition and morphologies of metal nanoparticles Fe (NPs) using means of molecular dynamics (MD) simulation. Tracing the number of crystal atoms and the analysis of radial distribution functions, we found that the amorphous Fe NP is transformed into bcc crystal one when it was annealed for long times at 900 K. At the early stage of the annealing, small nuclei form in different places of NP and dissolve for short times. After long times some nuclei form and gather nearby which creates the stable clusters in the core of NP and to spread into the surface of NP. Based on the mean potential energy per atom analysis and MD data visualisation technique, the effect of B atoms that prevent the growth of crystallisation as well as the different morphologies of Fe and FeB NPs have been investigated in detail.","PeriodicalId":35049,"journal":{"name":"International Journal of Microstructure and Materials Properties","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46050370","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-08-18DOI: 10.1504/IJMMP.2019.10023320
S. Kaluvan, Haifeng Zhang, S. Mridha, S. Mukherjee
Bulk metallic glasses (BMGs) are fully amorphous multi-component alloys with homogeneous and isotropic structure down to the atomic scale. Some attractive attributes of BMGs include high strength and hardness as well as excellent corrosion and wear resistance. The research goal of this paper is to determine the mechanical properties at elevated temperatures. To accomplish this goal, we have used two methods in this paper to determine the Young's modulus of a BMGs, Zr41.2Ti13.8Cu12.5Ni10Be22.5 at elevated temperatures: sonic resonance method and nanoindentation. In the sonic resonance method, the system was designed using a laser displacement sensor to detect the sonic vibration produced by a speaker on the specimen in high-temperature furnace. The Young'ss modulus was found to reduce from 100 GPa (350°C) to 94 GPa (50°C). In the nanoindentation method, modulus was determined from the unloading curve and found to be in the same range as measurements from sonic resonance technique.
{"title":"Determination of temperature-dependent Young's modulus of bulk metallic glass","authors":"S. Kaluvan, Haifeng Zhang, S. Mridha, S. Mukherjee","doi":"10.1504/IJMMP.2019.10023320","DOIUrl":"https://doi.org/10.1504/IJMMP.2019.10023320","url":null,"abstract":"Bulk metallic glasses (BMGs) are fully amorphous multi-component alloys with homogeneous and isotropic structure down to the atomic scale. Some attractive attributes of BMGs include high strength and hardness as well as excellent corrosion and wear resistance. The research goal of this paper is to determine the mechanical properties at elevated temperatures. To accomplish this goal, we have used two methods in this paper to determine the Young's modulus of a BMGs, Zr41.2Ti13.8Cu12.5Ni10Be22.5 at elevated temperatures: sonic resonance method and nanoindentation. In the sonic resonance method, the system was designed using a laser displacement sensor to detect the sonic vibration produced by a speaker on the specimen in high-temperature furnace. The Young'ss modulus was found to reduce from 100 GPa (350°C) to 94 GPa (50°C). In the nanoindentation method, modulus was determined from the unloading curve and found to be in the same range as measurements from sonic resonance technique.","PeriodicalId":35049,"journal":{"name":"International Journal of Microstructure and Materials Properties","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44676951","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-05-26DOI: 10.1504/IJMMP.2019.10021511
A. M. Mansour, E. M. El-Menyawy, G. M. Mahmoud
The cu2s powder was prepared by low-cost hydrothermal method and was deposited as thin films by thermal evaporation. The structural properties are explored by X-ray diffraction (XRD) and high-resolution transmission electron microscopy (HRTEM). The XRD shows a monoclinic polycrystalline nature of hydrothermally prepared powder, while the deposited film shows a hump corresponding to Cu2S nanocrystallites. HRTEM micrograph shows nanoparticles with sizes ranging from 30 to 45 nm. Based on the thermogravimetric results, the thermal kinetic parameters are calculated by application of Broido method. The optical energy band gap of the evaporated films is determined as 2.3 eV. The electrical conductivity, charge carriers concentration, carriers mobility and the magnetoresistance (MR) of the films are investigated as a function of temperature.
{"title":"Structural, optical and galvanomagnetical properties of low cost synthesised nanostructure Cu2S films","authors":"A. M. Mansour, E. M. El-Menyawy, G. M. Mahmoud","doi":"10.1504/IJMMP.2019.10021511","DOIUrl":"https://doi.org/10.1504/IJMMP.2019.10021511","url":null,"abstract":"The cu2s powder was prepared by low-cost hydrothermal method and was deposited as thin films by thermal evaporation. The structural properties are explored by X-ray diffraction (XRD) and high-resolution transmission electron microscopy (HRTEM). The XRD shows a monoclinic polycrystalline nature of hydrothermally prepared powder, while the deposited film shows a hump corresponding to Cu2S nanocrystallites. HRTEM micrograph shows nanoparticles with sizes ranging from 30 to 45 nm. Based on the thermogravimetric results, the thermal kinetic parameters are calculated by application of Broido method. The optical energy band gap of the evaporated films is determined as 2.3 eV. The electrical conductivity, charge carriers concentration, carriers mobility and the magnetoresistance (MR) of the films are investigated as a function of temperature.","PeriodicalId":35049,"journal":{"name":"International Journal of Microstructure and Materials Properties","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47935070","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-05-21DOI: 10.1504/IJMMP.2019.10021504
Dicki Nizar Zulfika, W. Widyastuti, L. Noerochim, Nanda Hendra Pratama, Subardi Marjali, I. Maulana, R. Ikono, N. Rochman
Cu-Cr composite is used in the electronic industry as a material which is directly connected to the electricity, as a component of a circuit breaker, cable contact, circuit board, etc. In this study, hot compaction method was employed to manufacture Cu-Cr composite which has excellent hardness and electrical conductivity. Composite manufacturing was based on powder metallurgy technique while mixing used mechanical milling method in regards to its better homogeneity. Hot compaction process set at the temperature of 300°C was applied to the powder material to increase the plasticity so the compaction can be done easier. Some variation was made on the composition of Cu : Cr ratio (90 : 10, 80 : 20, 70 : 30, and 60 : 40), and the compaction pressure (500, 700, and 1000 MPa). Sintering was conducted at 85°C with holding time of 1 h. Based on the results, the optimum sintering density of 96.81% of its theoretical density was obtained at Cu : Cr ratio as of 80 : 20. Maximum hardness at 60%Cu : 40%Cr and P = 1000 MPa was 129 VHN. And, electrical conductivity was reached its optimum value of 82.6% IACS when the Cu:Cr ratio was 90:10 at P = 1000 MPa.
{"title":"Analysis on the effect of pressure and mass fraction of chromium to mechanical properties and electrical conductivity of copper-chromium composite in hot compaction process","authors":"Dicki Nizar Zulfika, W. Widyastuti, L. Noerochim, Nanda Hendra Pratama, Subardi Marjali, I. Maulana, R. Ikono, N. Rochman","doi":"10.1504/IJMMP.2019.10021504","DOIUrl":"https://doi.org/10.1504/IJMMP.2019.10021504","url":null,"abstract":"Cu-Cr composite is used in the electronic industry as a material which is directly connected to the electricity, as a component of a circuit breaker, cable contact, circuit board, etc. In this study, hot compaction method was employed to manufacture Cu-Cr composite which has excellent hardness and electrical conductivity. Composite manufacturing was based on powder metallurgy technique while mixing used mechanical milling method in regards to its better homogeneity. Hot compaction process set at the temperature of 300°C was applied to the powder material to increase the plasticity so the compaction can be done easier. Some variation was made on the composition of Cu : Cr ratio (90 : 10, 80 : 20, 70 : 30, and 60 : 40), and the compaction pressure (500, 700, and 1000 MPa). Sintering was conducted at 85°C with holding time of 1 h. Based on the results, the optimum sintering density of 96.81% of its theoretical density was obtained at Cu : Cr ratio as of 80 : 20. Maximum hardness at 60%Cu : 40%Cr and P = 1000 MPa was 129 VHN. And, electrical conductivity was reached its optimum value of 82.6% IACS when the Cu:Cr ratio was 90:10 at P = 1000 MPa.","PeriodicalId":35049,"journal":{"name":"International Journal of Microstructure and Materials Properties","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47436170","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-05-21DOI: 10.1504/IJMMP.2019.10021509
A. A. Taqa, M. Al-Ansari, A. Senouci, Marwa M. Hassan, A. Shaat, Mohamed O. Mohsen
This study presents characterisation of concrete samples containing 0.75% by cement weight of modified calcium nitrate self-healing microcapsules. The phased array ultrasonic testing method was used to investigate the healing efficiency of calcium nitrate microcapsules in concrete. The method is a novel non-destructive testing technique that is commonly used for detecting the defects in welding. Concrete beams were prepared from the control mix (without microcapsules) and mixes containing 0.75% by weight of cement of calcium nitrate microcapsules. After 28 days of moist curing, the phased array ultrasonic images of all beams were captured before loading, after applying 60% of the ultimate flexural load, and after 3 and 7 days of accelerated healing. Moreover, scanning electron microscopy images taken from fractured surfaces of the beams that were loaded up to failure before healing were compared to those of the beams that were healed for 7 days and loaded up to failure.
{"title":"Characterisation of self-healing efficiency of calcium nitrate microcapsules for concrete applications","authors":"A. A. Taqa, M. Al-Ansari, A. Senouci, Marwa M. Hassan, A. Shaat, Mohamed O. Mohsen","doi":"10.1504/IJMMP.2019.10021509","DOIUrl":"https://doi.org/10.1504/IJMMP.2019.10021509","url":null,"abstract":"This study presents characterisation of concrete samples containing 0.75% by cement weight of modified calcium nitrate self-healing microcapsules. The phased array ultrasonic testing method was used to investigate the healing efficiency of calcium nitrate microcapsules in concrete. The method is a novel non-destructive testing technique that is commonly used for detecting the defects in welding. Concrete beams were prepared from the control mix (without microcapsules) and mixes containing 0.75% by weight of cement of calcium nitrate microcapsules. After 28 days of moist curing, the phased array ultrasonic images of all beams were captured before loading, after applying 60% of the ultimate flexural load, and after 3 and 7 days of accelerated healing. Moreover, scanning electron microscopy images taken from fractured surfaces of the beams that were loaded up to failure before healing were compared to those of the beams that were healed for 7 days and loaded up to failure.","PeriodicalId":35049,"journal":{"name":"International Journal of Microstructure and Materials Properties","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44036591","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-05-21DOI: 10.1504/IJMMP.2019.10021512
Asha R. Pai, B. Nair
The present study aims at the synthesis and structural characterisation of Sb-doped titania and zirconia nanoparticles using a modified precipitation synthesis method. The produced nanoparticles were characterised using various techniques such as UV-Visible spectroscopy, Scanning electron microscopy, Transmission electron microscopy and Dynamic light scattering. The crystallite sizes were obtained to be <20 nm for Sb-doped ZrO2 and <10 nm for Sb-Doped TiO2 which was very evident from the Transmission electron microscope images. The hydrodynamic sizes in the range of 100 nm using Dynamic light scattering method were also evaluated for the assessment for biological application. The optical band gap was found out to be 3.21 eV for Sb-Doped TiO2 and 3.87 eV for Sb-doped ZrO2.
{"title":"Synthesis and characterisation of Sb-doped ZrO2 and TiO2 nanoparticles","authors":"Asha R. Pai, B. Nair","doi":"10.1504/IJMMP.2019.10021512","DOIUrl":"https://doi.org/10.1504/IJMMP.2019.10021512","url":null,"abstract":"The present study aims at the synthesis and structural characterisation of Sb-doped titania and zirconia nanoparticles using a modified precipitation synthesis method. The produced nanoparticles were characterised using various techniques such as UV-Visible spectroscopy, Scanning electron microscopy, Transmission electron microscopy and Dynamic light scattering. The crystallite sizes were obtained to be <20 nm for Sb-doped ZrO2 and <10 nm for Sb-Doped TiO2 which was very evident from the Transmission electron microscope images. The hydrodynamic sizes in the range of 100 nm using Dynamic light scattering method were also evaluated for the assessment for biological application. The optical band gap was found out to be 3.21 eV for Sb-Doped TiO2 and 3.87 eV for Sb-doped ZrO2.","PeriodicalId":35049,"journal":{"name":"International Journal of Microstructure and Materials Properties","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43477054","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-05-21DOI: 10.1504/IJMMP.2019.10021508
A. Gandhi, R. Panda, S. Mohanty, S. K. Nayak
In this study, bimodal microcellular acrylonitrile butadiene styrene (ABS) foams have been manufactured through solid-state batch foaming process using two staged gas depressurisation technique. After blowing agent saturation, the thermodynamic instability induction on polymer/gas system due to instantaneous pressure drop was performed at two distinct depressurisation stages. Each stage corresponded to nucleation of discrete cell morphology in the polymer matrix. This paper puts forward a study to understand the fundamental mechanism behind bi-modal cell nucleation phenomenon. Further, Influence of holding time, holding pressure, foaming temperature and foaming time on the foam morphological attributes were studied. By altering the process parameters, the morphological attributes in the final product could be controlled efficiently.
{"title":"Microstructure assessment of bi-modal microcellular polymeric composites developed using multi-stage depressurisation technique in solid-state foaming technology","authors":"A. Gandhi, R. Panda, S. Mohanty, S. K. Nayak","doi":"10.1504/IJMMP.2019.10021508","DOIUrl":"https://doi.org/10.1504/IJMMP.2019.10021508","url":null,"abstract":"In this study, bimodal microcellular acrylonitrile butadiene styrene (ABS) foams have been manufactured through solid-state batch foaming process using two staged gas depressurisation technique. After blowing agent saturation, the thermodynamic instability induction on polymer/gas system due to instantaneous pressure drop was performed at two distinct depressurisation stages. Each stage corresponded to nucleation of discrete cell morphology in the polymer matrix. This paper puts forward a study to understand the fundamental mechanism behind bi-modal cell nucleation phenomenon. Further, Influence of holding time, holding pressure, foaming temperature and foaming time on the foam morphological attributes were studied. By altering the process parameters, the morphological attributes in the final product could be controlled efficiently.","PeriodicalId":35049,"journal":{"name":"International Journal of Microstructure and Materials Properties","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48760673","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-04-06DOI: 10.1504/IJMMP.2019.10020467
Tanusree Bera, S. Acharya, G. Sutradhar
In this work, the LM6/cenosphere composites were fabricated by the squeeze casting. The various weight percentages of cenosphere (wt. % c/s) (5, 7.5, 10, 12.5, and 15) wt. % c/s were selected for the synthesis of the LM6/composites. The characterisation of the reinforced and unreinforced composites through SEM, XRD, and EDX analysis was carried out. The mechanical properties (hardness, and tensile strength) were investigated. The optical properties were investigated through FTIR and UV-VIS-NIR. The results revealed that the reinforced LM6/cenosphere composites show better mechanical properties than the unreinforced composites. The 15 wt. % composites show the improved hardness and tensile strength with minimum porosity as compared with other reinforced composites. The XRD analysed the various phases of the materials. The EDX analysed the atomic and the wt. % of reinforced elements exists in the LM6/cenosphere composites. The SEM analysed the tensile fractured surfaces of the reinforced and unreinforced composites.
{"title":"Characterisation of LM6/cenosphere composites","authors":"Tanusree Bera, S. Acharya, G. Sutradhar","doi":"10.1504/IJMMP.2019.10020467","DOIUrl":"https://doi.org/10.1504/IJMMP.2019.10020467","url":null,"abstract":"In this work, the LM6/cenosphere composites were fabricated by the squeeze casting. The various weight percentages of cenosphere (wt. % c/s) (5, 7.5, 10, 12.5, and 15) wt. % c/s were selected for the synthesis of the LM6/composites. The characterisation of the reinforced and unreinforced composites through SEM, XRD, and EDX analysis was carried out. The mechanical properties (hardness, and tensile strength) were investigated. The optical properties were investigated through FTIR and UV-VIS-NIR. The results revealed that the reinforced LM6/cenosphere composites show better mechanical properties than the unreinforced composites. The 15 wt. % composites show the improved hardness and tensile strength with minimum porosity as compared with other reinforced composites. The XRD analysed the various phases of the materials. The EDX analysed the atomic and the wt. % of reinforced elements exists in the LM6/cenosphere composites. The SEM analysed the tensile fractured surfaces of the reinforced and unreinforced composites.","PeriodicalId":35049,"journal":{"name":"International Journal of Microstructure and Materials Properties","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47708257","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-04-06DOI: 10.1504/IJMMP.2019.10020465
F. Ravnik, J. Grum
Quenching and tempering often represent a stage near the end of the manufacturing process of machine components. The purpose of selecting the most suitable quenching parameters and controlling the hardening process is to ensure the required hardness and the residual stresses of a machine part. This paper includes the investigation of certain acoustic events during quenching. The possibility of understanding the relation between a connection during sound emission with the wetting kinematic of the quenching agent and a heated specimen with other phenomena during quenching was examined. It was determined that acoustic signals could identify the suitability, i.e.; the quality of the quenching process to ensure better control of the process. The possibility of acoustic signals caused by workpiece deformation and crack formation due to high internal stresses were examined. A comparison of results shows that this possibility can lead to an applicability of controlling the hardening process and quality of steel parts.
{"title":"Cracking perception of machine components with sound emission during steel quenching","authors":"F. Ravnik, J. Grum","doi":"10.1504/IJMMP.2019.10020465","DOIUrl":"https://doi.org/10.1504/IJMMP.2019.10020465","url":null,"abstract":"Quenching and tempering often represent a stage near the end of the manufacturing process of machine components. The purpose of selecting the most suitable quenching parameters and controlling the hardening process is to ensure the required hardness and the residual stresses of a machine part. This paper includes the investigation of certain acoustic events during quenching. The possibility of understanding the relation between a connection during sound emission with the wetting kinematic of the quenching agent and a heated specimen with other phenomena during quenching was examined. It was determined that acoustic signals could identify the suitability, i.e.; the quality of the quenching process to ensure better control of the process. The possibility of acoustic signals caused by workpiece deformation and crack formation due to high internal stresses were examined. A comparison of results shows that this possibility can lead to an applicability of controlling the hardening process and quality of steel parts.","PeriodicalId":35049,"journal":{"name":"International Journal of Microstructure and Materials Properties","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45033753","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-04-06DOI: 10.1504/IJMMP.2019.10020469
K. Arroudj, M. N. Oudjit, A. Tagnit-Hamou
This study aims to highlight siliceous additive available in Algeria: ground blast furnace slag 'S' and dune sand or Quartz 'Q' compared to silica fume 'SF'. Monitoring the hydration of cement pastes modified by replacing 15% additive by thermal analysis (Differential thermal and thermo gravimetric analysis -DTA/TG) quantifies the Portlandite consumed by the additive, the combined water 'Wn' and the degree of hydration as function of time. The results of this study confirm and complement those found in previous research: compared to SF and S, quartz has a low pozzolanic activity resulted in consumption of Portlandite released during cement hydration. This study is completed by mechanical tests on ultra high performance concrete (UHPC), with a same level of replacement. A new generation of sustainable and eco-concrete is obtained based on local materials.
{"title":"Contribution to thermal study of modified cement pastes based on siliceous SCMs","authors":"K. Arroudj, M. N. Oudjit, A. Tagnit-Hamou","doi":"10.1504/IJMMP.2019.10020469","DOIUrl":"https://doi.org/10.1504/IJMMP.2019.10020469","url":null,"abstract":"This study aims to highlight siliceous additive available in Algeria: ground blast furnace slag 'S' and dune sand or Quartz 'Q' compared to silica fume 'SF'. Monitoring the hydration of cement pastes modified by replacing 15% additive by thermal analysis (Differential thermal and thermo gravimetric analysis -DTA/TG) quantifies the Portlandite consumed by the additive, the combined water 'Wn' and the degree of hydration as function of time. The results of this study confirm and complement those found in previous research: compared to SF and S, quartz has a low pozzolanic activity resulted in consumption of Portlandite released during cement hydration. This study is completed by mechanical tests on ultra high performance concrete (UHPC), with a same level of replacement. A new generation of sustainable and eco-concrete is obtained based on local materials.","PeriodicalId":35049,"journal":{"name":"International Journal of Microstructure and Materials Properties","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47632393","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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