This work focused on reusing polyvinyl chloride (PVC) plastic waste from bottle labels (BLWA) as ... more This work focused on reusing polyvinyl chloride (PVC) plastic waste from bottle labels (BLWA) as lightweight aggregates in geopolymer mortar. This way of reusing plastic waste is beneficial for diminishing the negative impacts of plastics on the environment and reducing CO2 emissions by using geopolymer as an alternative cementing material. BLWA was used to partially substitute natural fine aggregate at ratios of 0, 5, 10, 15, and 20% by volume. The geopolymer mortar properties were tested, and the durability after exposure to elevated temperatures was also assessed. It was found that the strengths were adversely affected by increasing BLWA content. The water absorption and porosity were also increased with beneficial benefits on the reduced density (9–17%) and thermal conductivity (28–44%). The geopolymer mortar containing 5–15% BLWA satisfied the requirement of a lightweight mortar used in masonry work. After exposure to temperatures up to 600 °C, the properties of geopolymer mort...
Concrete structures, when exposed to fire or high temperatures for a certain time, could suffer p... more Concrete structures, when exposed to fire or high temperatures for a certain time, could suffer partial damage or complete structural failure. Passive fire-protective coating materials are an alternative way to prevent or delay damage to concrete structures resulting from fire. Superabsorbent polymer (SP) is a synthetic material known for its ability to absorb and retain a large volume of water within itself. With this unique property, the SP exhibits great potential for use as a passive fire protection material. Although several studies have been carried out to investigate the effect of SP as a surface coating material for fire protection, very few have been investigated on the potential use of SP mixed with mortar as a passive fire-protective layer. The objective of this study is to introduce the use of SP in plastering mortar as a fire-protective layer for concrete subjected to temperatures up to 800 °C. This study is divided into two parts: (1) investigating the properties of ce...
This paper proposes a novel nanobar–substrate medium model for static and free vibration analyses... more This paper proposes a novel nanobar–substrate medium model for static and free vibration analyses of single-walled carbon nanotube (SWCNT) systems embedded in the elastic substrate medium. The modified strain-gradient elasticity theory is utilized to account for the material small-scale effect, while the Gurtin–Murdoch surface theory is employed to represent the surface energy effect. The Winkler foundation model is assigned to consider the interactive mechanism between the nanobar and its surrounding substrate medium. Hamilton’s principle is used to consistently derive the system governing equation, initial conditions, and classical as well as non-classical boundary conditions. Two numerical simulations are employed to demonstrate the essence of the material small-scale effect, the surface energy effect, and the surrounding substrate medium on static and free vibration responses of single-walled carbon nanotube (SWCNT)–substrate medium systems. The simulation results show that the ...
This paper presents an alternative approach to formulating a rational bar-elastic substrate model... more This paper presents an alternative approach to formulating a rational bar-elastic substrate model with inclusion of small-scale and surface-energy effects. The thermodynamics-based strain gradient model is utilized to account for the small-scale effect (nonlocality) of the bar-bulk material while the Gurtin–Murdoch surface theory is adopted to capture the surface-energy effect. To consider the bar-surrounding substrate interactive mechanism, the Winkler foundation model is called for. The governing differential compatibility equation as well as the consistent end-boundary compatibility conditions are revealed using the virtual force principle and form the core of the model formulation. Within the framework of the virtual force principle, the axial force field serves as the fundamental solution to the governing differential compatibility equation. The problem of a nanowire embedded in an elastic substrate medium is employed as a numerical example to show the accuracy of the proposed ...
The Journal of King Mongkut's University of Technology North Bangkok, 2018
This study presents the preliminary test results from the multilayer bulletproof concrete panel p... more This study presents the preliminary test results from the multilayer bulletproof concrete panel project. The tested multilayer panel consisted of steel fiber reinforced concrete (SFRC), Para-rubber and Styrofoam sheet. In this study, the focus was on the investigation of the failure patterns and energy absorption of each material with different thickness subjected to direct fire arm with 9 mm bullets. The obtained information will later be used in designing the multilayer bulletproof concrete panel based on combination of energy absorption. The results showed that the energy absorption of each material increased with the increasing thickness. In case of SFRC, the energy absorption also depended on fiber type and volume fractions. Comparing at the same thickness, SFRC was the most effective energy absorption followed by Para-rubber and Styrofoam sheet respectively.
Small circular plates of fibre reinforced concrete (FRC) with a diameter of 100 mm and thickness ... more Small circular plates of fibre reinforced concrete (FRC) with a diameter of 100 mm and thickness of 20 mm were subjected to low velocity impact, leading to penetration of the plates. Three kinds of concrete were used: plain, single fibre FRC, and hybrid fibre FRC. For the FRC, macro fibres (hooked end steel) and micro fibres (carbon and polypropylene) were used. For the single fibre FRCs, 1% by volume (Vf) of each of the three fibre types was investigated. For the hybrid FRC, combinations of steel -polypropylene and steel-carbon at V f = 0.5% each were used. It was found that at this proportion, the performance of the hybrid FRC was not as good as that of the Vf = 1.0% steel FRC.
Abstract Porous aggregate can be used as a medium to carry phase change material (PCM) into cemen... more Abstract Porous aggregate can be used as a medium to carry phase change material (PCM) into cement materials. The benefits of using PCM aggregates (PCMA) include the ability to incorporate large amount of PCM (up to about 8% by weight of concrete) into concrete without compromising the mechanical properties. However, an important drawback is the leakage of PCM with time. In this study, the activated silica fume (ASF) is introduced as a surface coating material using a tumbling machine. The experimental series included the investigation on properties of PCMA and PCMA coated with ASF (ASF-PCMA) before and after being subjected to a number of heat/cool cycles, and the properties of rubberized concrete (RC) mixed with PCMA and ASF-PCMA. Results showed that the ASF coating was able to reduce the amount of PCM leakage by about 5.4 times after being subjected to 100 heat/cool cycles. The mechanical properties of RC mixed with ASF-PCMA was slightly better than those mixed with PCMA. For the thermal conductivity (K), ASF coating provides both positive and negative effects to the thermal conductivity of RC depending on the state of PCM that K was being measured. Because of less leakage, the loss in latent heat storage capacity of RC mixed with ASF-PCMA was less than those mixed with PCMA.
This work focused on reusing polyvinyl chloride (PVC) plastic waste from bottle labels (BLWA) as ... more This work focused on reusing polyvinyl chloride (PVC) plastic waste from bottle labels (BLWA) as lightweight aggregates in geopolymer mortar. This way of reusing plastic waste is beneficial for diminishing the negative impacts of plastics on the environment and reducing CO2 emissions by using geopolymer as an alternative cementing material. BLWA was used to partially substitute natural fine aggregate at ratios of 0, 5, 10, 15, and 20% by volume. The geopolymer mortar properties were tested, and the durability after exposure to elevated temperatures was also assessed. It was found that the strengths were adversely affected by increasing BLWA content. The water absorption and porosity were also increased with beneficial benefits on the reduced density (9–17%) and thermal conductivity (28–44%). The geopolymer mortar containing 5–15% BLWA satisfied the requirement of a lightweight mortar used in masonry work. After exposure to temperatures up to 600 °C, the properties of geopolymer mort...
Concrete structures, when exposed to fire or high temperatures for a certain time, could suffer p... more Concrete structures, when exposed to fire or high temperatures for a certain time, could suffer partial damage or complete structural failure. Passive fire-protective coating materials are an alternative way to prevent or delay damage to concrete structures resulting from fire. Superabsorbent polymer (SP) is a synthetic material known for its ability to absorb and retain a large volume of water within itself. With this unique property, the SP exhibits great potential for use as a passive fire protection material. Although several studies have been carried out to investigate the effect of SP as a surface coating material for fire protection, very few have been investigated on the potential use of SP mixed with mortar as a passive fire-protective layer. The objective of this study is to introduce the use of SP in plastering mortar as a fire-protective layer for concrete subjected to temperatures up to 800 °C. This study is divided into two parts: (1) investigating the properties of ce...
This paper proposes a novel nanobar–substrate medium model for static and free vibration analyses... more This paper proposes a novel nanobar–substrate medium model for static and free vibration analyses of single-walled carbon nanotube (SWCNT) systems embedded in the elastic substrate medium. The modified strain-gradient elasticity theory is utilized to account for the material small-scale effect, while the Gurtin–Murdoch surface theory is employed to represent the surface energy effect. The Winkler foundation model is assigned to consider the interactive mechanism between the nanobar and its surrounding substrate medium. Hamilton’s principle is used to consistently derive the system governing equation, initial conditions, and classical as well as non-classical boundary conditions. Two numerical simulations are employed to demonstrate the essence of the material small-scale effect, the surface energy effect, and the surrounding substrate medium on static and free vibration responses of single-walled carbon nanotube (SWCNT)–substrate medium systems. The simulation results show that the ...
This paper presents an alternative approach to formulating a rational bar-elastic substrate model... more This paper presents an alternative approach to formulating a rational bar-elastic substrate model with inclusion of small-scale and surface-energy effects. The thermodynamics-based strain gradient model is utilized to account for the small-scale effect (nonlocality) of the bar-bulk material while the Gurtin–Murdoch surface theory is adopted to capture the surface-energy effect. To consider the bar-surrounding substrate interactive mechanism, the Winkler foundation model is called for. The governing differential compatibility equation as well as the consistent end-boundary compatibility conditions are revealed using the virtual force principle and form the core of the model formulation. Within the framework of the virtual force principle, the axial force field serves as the fundamental solution to the governing differential compatibility equation. The problem of a nanowire embedded in an elastic substrate medium is employed as a numerical example to show the accuracy of the proposed ...
The Journal of King Mongkut's University of Technology North Bangkok, 2018
This study presents the preliminary test results from the multilayer bulletproof concrete panel p... more This study presents the preliminary test results from the multilayer bulletproof concrete panel project. The tested multilayer panel consisted of steel fiber reinforced concrete (SFRC), Para-rubber and Styrofoam sheet. In this study, the focus was on the investigation of the failure patterns and energy absorption of each material with different thickness subjected to direct fire arm with 9 mm bullets. The obtained information will later be used in designing the multilayer bulletproof concrete panel based on combination of energy absorption. The results showed that the energy absorption of each material increased with the increasing thickness. In case of SFRC, the energy absorption also depended on fiber type and volume fractions. Comparing at the same thickness, SFRC was the most effective energy absorption followed by Para-rubber and Styrofoam sheet respectively.
Small circular plates of fibre reinforced concrete (FRC) with a diameter of 100 mm and thickness ... more Small circular plates of fibre reinforced concrete (FRC) with a diameter of 100 mm and thickness of 20 mm were subjected to low velocity impact, leading to penetration of the plates. Three kinds of concrete were used: plain, single fibre FRC, and hybrid fibre FRC. For the FRC, macro fibres (hooked end steel) and micro fibres (carbon and polypropylene) were used. For the single fibre FRCs, 1% by volume (Vf) of each of the three fibre types was investigated. For the hybrid FRC, combinations of steel -polypropylene and steel-carbon at V f = 0.5% each were used. It was found that at this proportion, the performance of the hybrid FRC was not as good as that of the Vf = 1.0% steel FRC.
Abstract Porous aggregate can be used as a medium to carry phase change material (PCM) into cemen... more Abstract Porous aggregate can be used as a medium to carry phase change material (PCM) into cement materials. The benefits of using PCM aggregates (PCMA) include the ability to incorporate large amount of PCM (up to about 8% by weight of concrete) into concrete without compromising the mechanical properties. However, an important drawback is the leakage of PCM with time. In this study, the activated silica fume (ASF) is introduced as a surface coating material using a tumbling machine. The experimental series included the investigation on properties of PCMA and PCMA coated with ASF (ASF-PCMA) before and after being subjected to a number of heat/cool cycles, and the properties of rubberized concrete (RC) mixed with PCMA and ASF-PCMA. Results showed that the ASF coating was able to reduce the amount of PCM leakage by about 5.4 times after being subjected to 100 heat/cool cycles. The mechanical properties of RC mixed with ASF-PCMA was slightly better than those mixed with PCMA. For the thermal conductivity (K), ASF coating provides both positive and negative effects to the thermal conductivity of RC depending on the state of PCM that K was being measured. Because of less leakage, the loss in latent heat storage capacity of RC mixed with ASF-PCMA was less than those mixed with PCMA.
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Papers by Piti Sukontasukkul