首页期刊导航|Iranian Journal of Science and Technology, Transaction of Civil Engineering
期刊信息/Journal information
Iranian Journal of Science and Technology, Transaction of Civil Engineering
Shiraz University
Shiraz University
半年刊
2228-6160
Iranian Journal of Science and Technology, Transaction of Civil Engineering/Journal Iranian Journal of Science and Technology, Transaction of Civil Engineering
查看更多>>摘要：The evolution of high performance geopolymer concrete (GPC) has become additionally significant for researchers and industry professionals due to the environmental issues related with the use of bulk cement in construction projects. By using fly ash (FA), bottom ash (BA), slag (GGBS), rice husk ash (RHA), and other industrial wastes as the principal binder instead of Portland cement, these mixes promote a greener approach to bulk concrete production. These high-performance blends are often associated with the incorporation of nanomaterials (NM) in the mix. Moreover, it has been demonstrated that NM incorporation offers GPC blends superior mechanical properties, and frequently does away with the requirement for thermal curing which further reduces the energy demand for production. This incorporation of NM also results in a denser inter-particle packing at a micro level, which increases the blend's durability. The performances of GPC blends dosed with various NM, such as carbon nanotubes (CNT), nano-silica (NS), nano-alumina (NA), nano-titanium di oxide (NT), nano-clay (NC), and nano-graphene oxide (NG), are thoroughly summarized in this article in terms of mechanical, durability, and microstructural qualities. The final inferences and conclusions were drawn keeping in mind the viability of bulk consumption. Ultimately, TOPSIS analysis was carried out to determine the optimum type and dosage of NM in GPC and it was found that NS dosed at 2% yielded the most favorable outcomes. Present limitations and challenges related to the bulk utilization of GPC doped with NM are also discussed towards the end of this review, along with potential directions for further research.
查看更多>>摘要：The evolution of high performance geopolymer concrete (GPC) has become additionally significant for researchers and industry professionals due to the environmental issues related with the use of bulk cement in construction projects. By using fly ash (FA), bottom ash (BA), slag (GGBS), rice husk ash (RHA), and other industrial wastes as the principal binder instead of Portland cement, these mixes promote a greener approach to bulk concrete production. These high-performance blends are often associated with the incorporation of nanomaterials (NM) in the mix. Moreover, it has been demonstrated that NM incorporation offers GPC blends superior mechanical properties, and frequently does away with the requirement for thermal curing which further reduces the energy demand for production. This incorporation of NM also results in a denser inter-particle packing at a micro level, which increases the blend's durability. The performances of GPC blends dosed with various NM, such as carbon nanotubes (CNT), nano-silica (NS), nano-alumina (NA), nano-titanium di oxide (NT), nano-clay (NC), and nano-graphene oxide (NG), are thoroughly summarized in this article in terms of mechanical, durability, and microstructural qualities. The final inferences and conclusions were drawn keeping in mind the viability of bulk consumption. Ultimately, TOPSIS analysis was carried out to determine the optimum type and dosage of NM in GPC and it was found that NS dosed at 2% yielded the most favorable outcomes. Present limitations and challenges related to the bulk utilization of GPC doped with NM are also discussed towards the end of this review, along with potential directions for further research.
查看更多>>摘要：Despite its widespread use and status as a groundbreaking construction material, concrete presents challenges due to its susceptibility to degradation. Due to this reason, concrete structures require regular maintenance, and traditional concrete crack repair methods are resource-intensive and expensive, while also having limitations in their applicability to different crack types. Microbially induced calcite precipitation (MICP) is a promising technique for the maintenance of concrete structures due to its novel approach in concrete technology for healing. The concept of MICP holds promise for sustainable infrastructure development by reducing the need for maintenance and repairs. This paper aims to provide a thorough review of published knowledge on MICP for concrete maintenance to assess and identify effective techniques and methods for MICP in concrete crack healing; this helps practitioners and designers in their decision-making processes. The study focuses on (1) MICP healing efficacy, (2) bacterial species, (3) nutrient supply methods, (4) crack remediation strategies and material compatibility, and (5) environmental conditions. This paper discusses and summarizes effective techniques and methods for MICP healing of concrete. Finally, potential future research directions for further optimizing and implementing MICP in practical applications are discussed. The significance of this work is to provide a concise review summary of the effective strategies and methods of applying MICP to the healing of concrete cracks for researchers and professionals.
查看更多>>摘要：Despite its widespread use and status as a groundbreaking construction material, concrete presents challenges due to its susceptibility to degradation. Due to this reason, concrete structures require regular maintenance, and traditional concrete crack repair methods are resource-intensive and expensive, while also having limitations in their applicability to different crack types. Microbially induced calcite precipitation (MICP) is a promising technique for the maintenance of concrete structures due to its novel approach in concrete technology for healing. The concept of MICP holds promise for sustainable infrastructure development by reducing the need for maintenance and repairs. This paper aims to provide a thorough review of published knowledge on MICP for concrete maintenance to assess and identify effective techniques and methods for MICP in concrete crack healing; this helps practitioners and designers in their decision-making processes. The study focuses on (1) MICP healing efficacy, (2) bacterial species, (3) nutrient supply methods, (4) crack remediation strategies and material compatibility, and (5) environmental conditions. This paper discusses and summarizes effective techniques and methods for MICP healing of concrete. Finally, potential future research directions for further optimizing and implementing MICP in practical applications are discussed. The significance of this work is to provide a concise review summary of the effective strategies and methods of applying MICP to the healing of concrete cracks for researchers and professionals.
查看更多>>摘要：It is thought that structural control systems developed for structures exposed to earthquake warnings may have an important place in the future as well as today. Among these, base isolation systems offer effective and practical solutions by damping earthquake-induced vibrations at the isolation level. However, due to the lack of self-adaptation feature against some near- or far-field earthquakes, semi-active and active control systems have been proposed by some researchers. These systems, which use an external power source, also need a control algorithm in order to take action in the event of an earthquake. In other words, in order for the control system to adapt to any earthquake and act as a vibration damper, a passive device, energy to activate the device and a control algorithm are needed. This review covers important studies on passive, semi-active, hybrid and active control systems recommended for the protection of structures against vibrations caused by earthquakes. The advantages and disadvantages of the studies on these control systems compared to each other have been determined. As a result of the study, some inferences were made about what kind of control system would be recommended in the future, taking into account the deficiencies in the literature.
查看更多>>摘要：It is thought that structural control systems developed for structures exposed to earthquake warnings may have an important place in the future as well as today. Among these, base isolation systems offer effective and practical solutions by damping earthquake-induced vibrations at the isolation level. However, due to the lack of self-adaptation feature against some near- or far-field earthquakes, semi-active and active control systems have been proposed by some researchers. These systems, which use an external power source, also need a control algorithm in order to take action in the event of an earthquake. In other words, in order for the control system to adapt to any earthquake and act as a vibration damper, a passive device, energy to activate the device and a control algorithm are needed. This review covers important studies on passive, semi-active, hybrid and active control systems recommended for the protection of structures against vibrations caused by earthquakes. The advantages and disadvantages of the studies on these control systems compared to each other have been determined. As a result of the study, some inferences were made about what kind of control system would be recommended in the future, taking into account the deficiencies in the literature.
查看更多>>摘要：Reinforced concrete structures, which generally resist high temperatures well and usually do not suffer destruction, therefore require an assessment of the concrete's condition after a fire. This review explores various techniques for assessing Fire Exposed Concrete (FEC) and provides comprehensive insights into their application by examining the principles, advantages, drawbacks, and feasibility of these methods. This comprehensive analysis aims to enhance assessment effectiveness and improve outcomes in restoring the integrity and safety of fire-damaged concrete structures. Overall, this review contributes to the literature by systematically outlining assessment techniques and providing valuable insights for researchers, engineers, and practitioners in selecting suitable methods and aiding informed decision-making on repair strategies. Samples extracted utilizing core procedures may be subjected to laboratory studies, especially non-linear approaches. The bibliometric analysis concludes significant linkages and trends in study areas including fire resistance and Non-Destructive Testing (NDT) of FEC are presented by analyzing keyword networks during the last 20 years. With more than 40 citations to back up their findings, highlighted the importance of and relationships between important subjects in this discipline. Techniques such as crack density measurement, indirect UPV, impact echo, Ground-Penetrating Radar (GPR), petrography, Differential Thermal Analysis (DTA) and Thermogravimetric Analysis (TGA) may be performed to determine the damage depth of concrete subjected to fire; however, caution is advised as each approach has its limitations.
查看更多>>摘要：Reinforced concrete structures, which generally resist high temperatures well and usually do not suffer destruction, therefore require an assessment of the concrete's condition after a fire. This review explores various techniques for assessing Fire Exposed Concrete (FEC) and provides comprehensive insights into their application by examining the principles, advantages, drawbacks, and feasibility of these methods. This comprehensive analysis aims to enhance assessment effectiveness and improve outcomes in restoring the integrity and safety of fire-damaged concrete structures. Overall, this review contributes to the literature by systematically outlining assessment techniques and providing valuable insights for researchers, engineers, and practitioners in selecting suitable methods and aiding informed decision-making on repair strategies. Samples extracted utilizing core procedures may be subjected to laboratory studies, especially non-linear approaches. The bibliometric analysis concludes significant linkages and trends in study areas including fire resistance and Non-Destructive Testing (NDT) of FEC are presented by analyzing keyword networks during the last 20 years. With more than 40 citations to back up their findings, highlighted the importance of and relationships between important subjects in this discipline. Techniques such as crack density measurement, indirect UPV, impact echo, Ground-Penetrating Radar (GPR), petrography, Differential Thermal Analysis (DTA) and Thermogravimetric Analysis (TGA) may be performed to determine the damage depth of concrete subjected to fire; however, caution is advised as each approach has its limitations.
查看更多>>摘要：Despite advancements in energy efficiency, the construction and operation of our built environment remains responsible for 34% of global energy demand and 37% of CO_2 emissions, exacerbating environmental challenges. Climate indicators are worsening; carbon dioxide levels continue to rise, putting the world on a trajectory for a 2% annual increase. Every country, city, organization, and company need to adopt net-zero plans to combat this crisis. The construction industry requires innovative and sustainable solutions, including the exploration of eco-friendly construction materials, to achieve carbon neutrality by 2050. The use of supplementary cementitious materials (SCMs) to partially replace cement in concrete production is a significant stride towards sustainable construction practices, effectively addressing waste generation and environmental concerns associated with traditional cement usage. SCMs help in recycling industrial by-products and agricultural wastes, significantly reducing landfill waste and promoting resource efficiency. Additionally, partial replacement of cement with SCMs can lower CO_2 emissions from cement production, contributing to the construction sector's net-zero goals. Moreover, SCMs can improve the durability and lifespan of concrete structures, reducing the need for frequent repairs and maintenance, thus saving costs and resources over time. This study summarizes diverse SCMs for partial cement replacement, explores their compositions, and emphasizes their crucial role in achieving carbon neutrality by 2050. It evaluates key characteristics such as compressive strength, durability, workability, and environmental impact to assess the performance, advantages, and challenges associated with these materials. This analysis guides practitioners in making informed decisions about their implementation in construction projects. Our review guides the construction industry towards more eco-friendly practices, contributing to the long-term sustainability and resilience of concrete structures. By mitigating the environmental footprint of cement production, we promote the creation of more sustainable and high-performance concrete structures.
查看更多>>摘要：Despite advancements in energy efficiency, the construction and operation of our built environment remains responsible for 34% of global energy demand and 37% of CO_2 emissions, exacerbating environmental challenges. Climate indicators are worsening; carbon dioxide levels continue to rise, putting the world on a trajectory for a 2% annual increase. Every country, city, organization, and company need to adopt net-zero plans to combat this crisis. The construction industry requires innovative and sustainable solutions, including the exploration of eco-friendly construction materials, to achieve carbon neutrality by 2050. The use of supplementary cementitious materials (SCMs) to partially replace cement in concrete production is a significant stride towards sustainable construction practices, effectively addressing waste generation and environmental concerns associated with traditional cement usage. SCMs help in recycling industrial by-products and agricultural wastes, significantly reducing landfill waste and promoting resource efficiency. Additionally, partial replacement of cement with SCMs can lower CO_2 emissions from cement production, contributing to the construction sector's net-zero goals. Moreover, SCMs can improve the durability and lifespan of concrete structures, reducing the need for frequent repairs and maintenance, thus saving costs and resources over time. This study summarizes diverse SCMs for partial cement replacement, explores their compositions, and emphasizes their crucial role in achieving carbon neutrality by 2050. It evaluates key characteristics such as compressive strength, durability, workability, and environmental impact to assess the performance, advantages, and challenges associated with these materials. This analysis guides practitioners in making informed decisions about their implementation in construction projects. Our review guides the construction industry towards more eco-friendly practices, contributing to the long-term sustainability and resilience of concrete structures. By mitigating the environmental footprint of cement production, we promote the creation of more sustainable and high-performance concrete structures.
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