Piti Sukontasukkul - Academia.edu (original) (raw)

Papers by Piti Sukontasukkul

Research paper thumbnail of Performance of Geopolymer Mortar Containing PVC Plastic Waste from Bottle Labels at Normal and Elevated Temperatures

Buildings

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...

Research paper thumbnail of Use of viscoelastic polymer sheet as an acoustic control treatment in ceramic tiles to improve sound insertion loss

Research paper thumbnail of Use of Cement Mortar Incorporating Superabsorbent Polymer as a Passive Fire-Protective Layer

Polymers

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...

Research paper thumbnail of Static and Free Vibration Analyses of Single-Walled Carbon Nanotube (SWCNT)–Substrate Medium Systems

Nanomaterials

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 ...

Research paper thumbnail of Surface refinement of steel fiber using nanosilica and silver and its effect on static and dynamic pullout resistance of reactive powder concrete

Journal of Building Engineering, 2022

Research paper thumbnail of Fire resistance of recycled aggregate alkali-activated concrete

Handbook of Advances in Alkali-Activated Concrete, 2022

Research paper thumbnail of Study on crack width and crack resistance of eccentrically tensioned steel-reinforced concrete members prestressed by CFRP tendons

Engineering Structures, 2022

:In recent decades, steel-reinforced concrete (SRC) members under eccentrical tension have been a... more :In recent decades, steel-reinforced concrete (SRC) members under eccentrical tension have been adopted more frequently in modern buildings due to the constraints of more complex structural design/detailing that accompanying contemporary architectural creations. Crack resistance of this type of structures has become a critical design consideration but received insufficient research attention in the past. In this context, the anti-cracking performance of prestressed SRC columns reinforced with CFRP tendons under eccentric tensile loads is investigated experimentally and analytically with the following first-hand experimental validations: 1) prestressed CFRP tendons can well strengthen SRC columns under eccentric tensile load and restrain the crack propagation; 2) an increase in the load eccentricity progressively weakened the influence of prestressing tension level on the cracking load; 3) specimens with the higher prestressed tension level, larger longitudinal reinforcement diameter, and flange thickness exhibited greater crack

Research paper thumbnail of Mechanical properties and electrical resistivity of multiwall carbon nanotubes incorporated into high calcium fly ash geopolymer

Case Studies in Construction Materials, 2021

Research paper thumbnail of Steel fiber reinforced concrete panels subjected to impact projectiles with different caliber sizes and muzzle energies

Case Studies in Construction Materials, 2020

In special situations like terrorist attacks, concrete structures are occasionally subjected to i... more In special situations like terrorist attacks, concrete structures are occasionally subjected to impact loads such as firearms. Since concrete is brittle, it often shatters into several pieces under impact loadings. In order to alleviate this brittleness, fibers are generally incorporated into concrete. In this study, steel fiber reinforced concrete panels subjected to projectile impact loads with different geometries was investigated. The impactors in the form of bullets came in three different caliber sizes 9, 11, and 7.62 mm, providing muzzle energies of 468, 1972, and 3259 J, respectively. Hooked end type steel fibers were used at 3 vol fractions of 1-3%. The specimens were cast in square panels with dimensions of 400 Â 400 mm and varying thickness from 10 to 100 mm. Each panel was subjected to a single impact at the center. Data in the form of velocity (prior to and after impact event), failure modes, and spalling diameters were collected. Results showed that four typical failure modes were commonly found in panels: perforation, scabbing, spalling, and cracking. For piercing type bullets, the thickness played an important role on the impact resistance of the panels. However, for large and blunt tip bullets, both thickness and fiber volume fraction must be considered together to provide sufficient impact resistance.

Research paper thumbnail of Resistance to sulfate attack and underwater abrasion of fiber reinforced cement mortar

Construction and Building Materials, 2018

The addition of fibers effectively increases erosion resistance to mortar. The increase depends o... more The addition of fibers effectively increases erosion resistance to mortar. The increase depends on fiber types and dosages. Polypropylene fiber is superior to steel and micro polypropylene fiber. Submersion in 5% w/w sodium sulfate decreases erosion resistance of mortar. Fibers cannot reduce the adverse effect of sulfate attack on mortar.

Research paper thumbnail of Use of recycled aggregates in pressed fly ash geopolymer concrete

Environmental Progress & Sustainable Energy, 2019

In this study, the physical, mechanical, and thermal properties of pressed geopolymer concrete (P... more In this study, the physical, mechanical, and thermal properties of pressed geopolymer concrete (PRGC) mixed with recycled concrete aggregate (RC) and recycled concrete block aggregate (RB) were investigated. Lignite coal fly ash, sodium hydroxide solution (NaOH), and sodium silicate solution were used as source materials to make geopolymer paste. The effect of fly ash to aggregate ratios and concentrations of NaOH on PRGC properties were tested. Test results were also compared to those of PRGCs mixed with conventional aggregate (limestone dust, SD). The test results showed that PRGCs containing RC and RB exhibited lower dry density, thermal conductivity, and compressive strength than those of PRGCs containing SD. Nevertheless, the compressive strength of PRGCs mixed with recycled aggregates was close to the compressive strength for moderate strength lightweight concrete as per ACI 213. Moreover, the lower thermal conductivity and dry density indicated better insulating properties than that of PRGCs containing SD. The developed PRGCs containing RC and RB in the study can be used for the manufacturing of hollow geopolymerbased concrete block which are green material with improved insulating properties.

Research paper thumbnail of Thermal properties of lightweight concrete incorporating high contents of phase change materials

Construction and Building Materials, 2019

This research investigated the latent heat and energy storage of lightweight concrete containing ... more This research investigated the latent heat and energy storage of lightweight concrete containing high contents of phase change material (PCM) (up to about 7.8% by weight of concrete). PCM-Polyethylene Glycol (PEG) with a fusion temperature of approximately 42-46˚C was impregnated into porous lightweight aggregates up to 24% by weight. The PCM aggregates were then used to replace normal lightweight aggregate at a rate of 0, 25, 50, 75 and 100% by volume. The samples were subjected to series of experiments such as compressive strength (EN12390-3 2002), flexural strength (ASTM C78), thermal conductivity 1

Research paper thumbnail of Design for Disassembly

The Journal of King Mongkut's University of Technology North Bangkok, 2018

Research paper thumbnail of Strain-Gradient Bar-Elastic Substrate Model with Surface-Energy Effect: Virtual-Force Approach

Nanomaterials

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 ...

Research paper thumbnail of Correction to: Improvement of recycled concrete aggregate using alkali-activated binder treatment

Materials and Structures

In this article the affiliation details for Kamonphop Khansamrit were incorrectly given as 'Progr... more In this article the affiliation details for Kamonphop Khansamrit were incorrectly given as 'Program of

Research paper thumbnail of Energy Absorption and Failure Patterns of Multilayer Bulletproof Concrete Panel Made of Steel Fiber, Styrofoam and Para-rubber

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.

Research paper thumbnail of Penetration Resistance of Hybrid Fibre Reinforced Concrete Under Low Velocity Impact Loading

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.

Research paper thumbnail of Potential Use of Calcium Carbonate Deposits from Bacteria in Cement Materials

Research paper thumbnail of Sustainable rubberized concrete mixed with surface treated PCM lightweight aggregates subjected to high temperature cycle

Construction and Building Materials

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.

Research paper thumbnail of Drying shrinkage, strength and microstructure of alkali-activated high-calcium fly ash using FGD-gypsum and dolomite as expansive additive

Cement and Concrete Composites

This paper aims to investigate drying shrinkage, strength development, and microstructure of alka... more This paper aims to investigate drying shrinkage, strength development, and microstructure of alkali-activated high-calcium fly ash (AAFA) paste by using FGD-gypsum 2 (FGD) and dolomite (DLM) as the expansive additive. The 10 molar of sodium hydroxide combined with sodium silicate solutions were used as liquid alkaline activation in all mixtures. The preparation of the AAFA paste was divided into 2 steps. First, the study was focused on the effects of expansive additive (FGD and DLM) and liquid/binder (L/B) ratio on the drying shrinkage of the AAFA paste. The FA was replaced by FGD and DLM at the dosages of 0%, 2.5%, 5.0%, 7.5%, and 10% by weight of binder. The AAFA paste with low drying shrinkage at the age of 90 days would be selected to further study. The other was to study setting time, compressive strength, and microstructure of the AAFA paste containing FGD and DLM. Test results indicated that the use of FGD and DLM as the expansive additive could improve the drying shrinkage of the AAFA paste. The increasing L/B ratio had adverse effects on its drying shrinkage. The setting time of the AAFA paste containing FGD and DLM had decreased, whereas its strength development had increased. However, the strength development of the AAFA paste incorporated with FGD tended to decline at the curing time of 120 days. These behaviors were consistent with the results of XRD, FTIR, and SEM/EDS analyses. The differences in reaction products were an essential factor in the strength development of the AAFA paste with expansive additive. It can be recommended that using DLM was advantages regarding the improvement of drying shrinkage and longterm strength in comparison with the AAFA paste with FGD.

Research paper thumbnail of Performance of Geopolymer Mortar Containing PVC Plastic Waste from Bottle Labels at Normal and Elevated Temperatures

Buildings

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...

Research paper thumbnail of Use of viscoelastic polymer sheet as an acoustic control treatment in ceramic tiles to improve sound insertion loss

Research paper thumbnail of Use of Cement Mortar Incorporating Superabsorbent Polymer as a Passive Fire-Protective Layer

Polymers

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...

Research paper thumbnail of Static and Free Vibration Analyses of Single-Walled Carbon Nanotube (SWCNT)–Substrate Medium Systems

Nanomaterials

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 ...

Research paper thumbnail of Surface refinement of steel fiber using nanosilica and silver and its effect on static and dynamic pullout resistance of reactive powder concrete

Journal of Building Engineering, 2022

Research paper thumbnail of Fire resistance of recycled aggregate alkali-activated concrete

Handbook of Advances in Alkali-Activated Concrete, 2022

Research paper thumbnail of Study on crack width and crack resistance of eccentrically tensioned steel-reinforced concrete members prestressed by CFRP tendons

Engineering Structures, 2022

:In recent decades, steel-reinforced concrete (SRC) members under eccentrical tension have been a... more :In recent decades, steel-reinforced concrete (SRC) members under eccentrical tension have been adopted more frequently in modern buildings due to the constraints of more complex structural design/detailing that accompanying contemporary architectural creations. Crack resistance of this type of structures has become a critical design consideration but received insufficient research attention in the past. In this context, the anti-cracking performance of prestressed SRC columns reinforced with CFRP tendons under eccentric tensile loads is investigated experimentally and analytically with the following first-hand experimental validations: 1) prestressed CFRP tendons can well strengthen SRC columns under eccentric tensile load and restrain the crack propagation; 2) an increase in the load eccentricity progressively weakened the influence of prestressing tension level on the cracking load; 3) specimens with the higher prestressed tension level, larger longitudinal reinforcement diameter, and flange thickness exhibited greater crack

Research paper thumbnail of Mechanical properties and electrical resistivity of multiwall carbon nanotubes incorporated into high calcium fly ash geopolymer

Case Studies in Construction Materials, 2021

Research paper thumbnail of Steel fiber reinforced concrete panels subjected to impact projectiles with different caliber sizes and muzzle energies

Case Studies in Construction Materials, 2020

In special situations like terrorist attacks, concrete structures are occasionally subjected to i... more In special situations like terrorist attacks, concrete structures are occasionally subjected to impact loads such as firearms. Since concrete is brittle, it often shatters into several pieces under impact loadings. In order to alleviate this brittleness, fibers are generally incorporated into concrete. In this study, steel fiber reinforced concrete panels subjected to projectile impact loads with different geometries was investigated. The impactors in the form of bullets came in three different caliber sizes 9, 11, and 7.62 mm, providing muzzle energies of 468, 1972, and 3259 J, respectively. Hooked end type steel fibers were used at 3 vol fractions of 1-3%. The specimens were cast in square panels with dimensions of 400 Â 400 mm and varying thickness from 10 to 100 mm. Each panel was subjected to a single impact at the center. Data in the form of velocity (prior to and after impact event), failure modes, and spalling diameters were collected. Results showed that four typical failure modes were commonly found in panels: perforation, scabbing, spalling, and cracking. For piercing type bullets, the thickness played an important role on the impact resistance of the panels. However, for large and blunt tip bullets, both thickness and fiber volume fraction must be considered together to provide sufficient impact resistance.

Research paper thumbnail of Resistance to sulfate attack and underwater abrasion of fiber reinforced cement mortar

Construction and Building Materials, 2018

The addition of fibers effectively increases erosion resistance to mortar. The increase depends o... more The addition of fibers effectively increases erosion resistance to mortar. The increase depends on fiber types and dosages. Polypropylene fiber is superior to steel and micro polypropylene fiber. Submersion in 5% w/w sodium sulfate decreases erosion resistance of mortar. Fibers cannot reduce the adverse effect of sulfate attack on mortar.

Research paper thumbnail of Use of recycled aggregates in pressed fly ash geopolymer concrete

Environmental Progress & Sustainable Energy, 2019

In this study, the physical, mechanical, and thermal properties of pressed geopolymer concrete (P... more In this study, the physical, mechanical, and thermal properties of pressed geopolymer concrete (PRGC) mixed with recycled concrete aggregate (RC) and recycled concrete block aggregate (RB) were investigated. Lignite coal fly ash, sodium hydroxide solution (NaOH), and sodium silicate solution were used as source materials to make geopolymer paste. The effect of fly ash to aggregate ratios and concentrations of NaOH on PRGC properties were tested. Test results were also compared to those of PRGCs mixed with conventional aggregate (limestone dust, SD). The test results showed that PRGCs containing RC and RB exhibited lower dry density, thermal conductivity, and compressive strength than those of PRGCs containing SD. Nevertheless, the compressive strength of PRGCs mixed with recycled aggregates was close to the compressive strength for moderate strength lightweight concrete as per ACI 213. Moreover, the lower thermal conductivity and dry density indicated better insulating properties than that of PRGCs containing SD. The developed PRGCs containing RC and RB in the study can be used for the manufacturing of hollow geopolymerbased concrete block which are green material with improved insulating properties.

Research paper thumbnail of Thermal properties of lightweight concrete incorporating high contents of phase change materials

Construction and Building Materials, 2019

This research investigated the latent heat and energy storage of lightweight concrete containing ... more This research investigated the latent heat and energy storage of lightweight concrete containing high contents of phase change material (PCM) (up to about 7.8% by weight of concrete). PCM-Polyethylene Glycol (PEG) with a fusion temperature of approximately 42-46˚C was impregnated into porous lightweight aggregates up to 24% by weight. The PCM aggregates were then used to replace normal lightweight aggregate at a rate of 0, 25, 50, 75 and 100% by volume. The samples were subjected to series of experiments such as compressive strength (EN12390-3 2002), flexural strength (ASTM C78), thermal conductivity 1

Research paper thumbnail of Design for Disassembly

The Journal of King Mongkut's University of Technology North Bangkok, 2018

Research paper thumbnail of Strain-Gradient Bar-Elastic Substrate Model with Surface-Energy Effect: Virtual-Force Approach

Nanomaterials

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 ...

Research paper thumbnail of Correction to: Improvement of recycled concrete aggregate using alkali-activated binder treatment

Materials and Structures

In this article the affiliation details for Kamonphop Khansamrit were incorrectly given as 'Progr... more In this article the affiliation details for Kamonphop Khansamrit were incorrectly given as 'Program of

Research paper thumbnail of Energy Absorption and Failure Patterns of Multilayer Bulletproof Concrete Panel Made of Steel Fiber, Styrofoam and Para-rubber

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.

Research paper thumbnail of Penetration Resistance of Hybrid Fibre Reinforced Concrete Under Low Velocity Impact Loading

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.

Research paper thumbnail of Potential Use of Calcium Carbonate Deposits from Bacteria in Cement Materials

Research paper thumbnail of Sustainable rubberized concrete mixed with surface treated PCM lightweight aggregates subjected to high temperature cycle

Construction and Building Materials

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.

Research paper thumbnail of Drying shrinkage, strength and microstructure of alkali-activated high-calcium fly ash using FGD-gypsum and dolomite as expansive additive

Cement and Concrete Composites

This paper aims to investigate drying shrinkage, strength development, and microstructure of alka... more This paper aims to investigate drying shrinkage, strength development, and microstructure of alkali-activated high-calcium fly ash (AAFA) paste by using FGD-gypsum 2 (FGD) and dolomite (DLM) as the expansive additive. The 10 molar of sodium hydroxide combined with sodium silicate solutions were used as liquid alkaline activation in all mixtures. The preparation of the AAFA paste was divided into 2 steps. First, the study was focused on the effects of expansive additive (FGD and DLM) and liquid/binder (L/B) ratio on the drying shrinkage of the AAFA paste. The FA was replaced by FGD and DLM at the dosages of 0%, 2.5%, 5.0%, 7.5%, and 10% by weight of binder. The AAFA paste with low drying shrinkage at the age of 90 days would be selected to further study. The other was to study setting time, compressive strength, and microstructure of the AAFA paste containing FGD and DLM. Test results indicated that the use of FGD and DLM as the expansive additive could improve the drying shrinkage of the AAFA paste. The increasing L/B ratio had adverse effects on its drying shrinkage. The setting time of the AAFA paste containing FGD and DLM had decreased, whereas its strength development had increased. However, the strength development of the AAFA paste incorporated with FGD tended to decline at the curing time of 120 days. These behaviors were consistent with the results of XRD, FTIR, and SEM/EDS analyses. The differences in reaction products were an essential factor in the strength development of the AAFA paste with expansive additive. It can be recommended that using DLM was advantages regarding the improvement of drying shrinkage and longterm strength in comparison with the AAFA paste with FGD.