Article
Chemistry, Physical
Jong Won Lee, Sang Hyuk Lee, Young Il Jang, Hee Mun Park
Summary: The research focused on improving concrete block pavements with added TiO2 to reduce air pollution, and found that the use of NST can enhance the photocatalytic performance of TiO2, leading to a decrease in NO and SO2 concentrations.
Article
Engineering, Environmental
Samuel C. Capp, David A. G. Sawtell, Craig E. Banks, Peter J. Kelly, Zaenab Abd-Allah
Summary: The study investigated the effects of combining titanium dioxide with non-thermal plasma, leading to increased ozone and N2O5 production while reducing harmful byproducts like NO2 and N2O. The presence of TiO2 affected plasma chemistry by acting as a sink for atomic oxygen and altering the dielectric constant of the BaTiO3 particulates. Annealing the surface improved TiO2 photocatalytic activity, enabling enhanced ozone and N2O5 formation while decreasing NO2 and N2O production.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Construction & Building Technology
Hong-Joon Choi, Jung-Jun Park, Doo-Yeol Yoo
Summary: This study aimed to develop a novel type of ultra-high-performance fiber-reinforced concrete (UHPFRC) with excellent mechanical properties and nitrogen oxide (NOx) removal capability. By replacing inert filler silica flour with photocatalyst titanium dioxide (TiO2), the UHPFRC showed improved tensile properties, energy-absorbing capacity, and NOx removal efficiency. The addition of TiO2 significantly enhanced the bond strength of straight steel fibers embedded in ultrahigh-performance concrete (UHPC), leading to a 7.7 times increase in NOx removal capability at a 75% replacement rate.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Jung-Jun Park, Jong-Won Kwark, Kwang Bok Yi, Jong Kyu Kim, Doo-Yeol Yoo
Summary: Adding different forms of titanium dioxide to foam concrete can increase its compressive strength and decrease porosity. P25 titanium dioxide performs the best in terms of NOx removal, achieving peak removal capacity at a content of 3%.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2023)
Article
Engineering, Civil
Humeyra Bolakar Tosun, Alper Alver, Emine Basturk
Summary: This study investigated the effectiveness of solar photocatalytic asphalt materials in reducing air pollution caused by vehicles. Through experiments, optimum conditions were determined and the efficiency of the material was compared with conventional asphalt pavements. It was concluded that photocatalysts can be functional in solving environmental problems, and solar radiation can be successfully utilized for nitrogen and oxide derivatives removal.
KSCE JOURNAL OF CIVIL ENGINEERING
(2022)
Article
Chemistry, Physical
Miyeon Kim, Hyunggeun Kim, Jinchul Park
Summary: The study demonstrates the NOx removal performance of photocatalytic construction materials through indoor and outdoor experiments. The results show that on sunny days, the NOx removal performance of photocatalytic construction materials is twice as much as that of conventional building materials.
Article
Chemistry, Multidisciplinary
Ji Hye Park, Min Woo Hong, Wathone Oo, Jung Joon Park, Hee Ju Park, Kwang Bok Yi
Summary: TiO2 supported on Ca12Al14O33 (Mayenite) was synthesized and investigated for use as a photocatalytic concrete material. TiO2/Mayenite catalysts exhibited significantly enhanced photocatalytic activities compared to pure TiO2, with the NO removal efficiency increasing up to 10 wt% TiO2 loading and then decreasing. XPS analysis showed that low TiO2 loading TiO2/M catalysts contained Ti-OH on the catalyst surface. The unique crystal structure of Mayenite that supplies oxygen ions and electrons to the TiO2 layer played a critical role in enhancing the photocatalytic activity of the catalyst.
KOREAN JOURNAL OF CHEMICAL ENGINEERING
(2023)
Article
Polymer Science
Juran Kim
Summary: A method for fabricating hollow TiO2 microfibers with different sizes using coaxial electrospinning has been presented. The flow rate during fabrication affects the physical properties and crystalline structure of the fibers. Under specific conditions, hollow TiO2 with approximately equal content of anatase and rutile phases can be produced. The fibers fabricated at a flow rate of 3 mL/h have the highest specific surface area and smallest pore diameter, offering superior performance in removing nitrogen oxides from the atmosphere.
Article
Chemistry, Analytical
Qian-Kun Li, Yue Li, Yan-Jun Wang, Jin-Yong Qi, Yan Wang, Yao-Dong Liu, Xue-Qing Liu
Summary: Ag-TiO2 nanoplate composite catalysts with doubled catalytic efficiency were prepared using a composite processing method. This composite catalyst shows promising applications in addressing environmental and energy challenges.
Article
Chemistry, Multidisciplinary
Duoduo Gao, Jiachao Xu, Huogen Yu, Yongping Liu, Jiaguo Yu
Summary: A hydroxyl-enriched highly crystalline TiO2 suspensible photocatalyst was synthesized using a simple ethanol-controlled hydrolysis and in situ crystallization method, and exhibited a significantly higher H-2 evolution rate than the well-known commercial P25 TiO2 without any cocatalysts.
CHEMICAL COMMUNICATIONS
(2021)
Article
Construction & Building Technology
Kamran M. Nemati, Jeff S. Uhlmeyer
Summary: This study presents a case study demonstrating the feasibility and effectiveness of rapid reconstruction at urban intersections. The results of the research indicate that with innovative construction techniques and traffic management principles, concrete pavements can be efficiently reconstructed with minimal user and traffic disruption.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2021)
Article
Engineering, Environmental
Adrian Pastor, Chunping Chen, Gustavo de Miguel, Francisco Martin, Manuel Cruz-Yusta, Jean-Charles Buffet, Dermot O'Hare, Ivana Pavlovic, Luis Sanchez
Summary: Newly prepared NixTi-AMO-LDHs photocatalysts showed superior performance in reducing NOx gases under simulated sunlight compared to conventional benchmarks, with exceptional reusability and low toxic NO2 release. The high surface area and pore volume of the catalysts played a significant role in the De-NOx process by facilitating adsorption of NO2 and N2O4 intermediates. The 2D character of the AMO-LDHs contributed to an enhancement in radical species production and reduction of charge carrier recombination under illumination.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Environmental Sciences
A. Nehdi, N. Frini-Srasra, G. de Miguel, I Pavlovic, L. Sanchez, J. Fragoso
Summary: The study focused on the use of layered double hydroxides for environmental remediation by converting chromate residues into photocatalysts for NOx gas removal. Results showed that LDH materials maintained their structure and exhibited improved NO removal efficiency and selectivity with the incorporation of chromate.
Article
Green & Sustainable Science & Technology
Seung Woo Lee, Hui Rak Ahn, Kyoung Su Kim, Young Kyu Kim
Summary: This study aims to apply the TiO2 penetration method to existing concrete road structures to reduce NOx. The results showed that the TiO2 penetration method was advantageous in removing NOx effectively and securing economic feasibility.
Article
Environmental Sciences
Xiao Qu, Jianbin Lin, Wei Qiang, Chuntao Chen, Dongping Sun
Summary: Photocatalytic activity of Titanium dioxide (TiO2) can be enhanced through structural regulation by chemical reduction method. The modified TiO2 samples show strong light absorption ability and exhibit excellent degradation performance for various organic pollutants.
Article
Construction & Building Technology
Hassan Noorvand, Gabriel A. Arce, Marwa M. Hassan
Summary: Engineered Cementitious Composites (ECC) show promising plasticity and flexural fatigue behavior, making them suitable for the construction of durable pavements. The ECC demonstrated a pseudo-strain-hardening (PSH) behavior and superior flexural fatigue performance compared to regular concrete. By integrating Finite Element Analysis (FEA) with experimental results, a thickness vs. cycles to failure (T-N) relationship was established, leading to improved accuracy in predicting failure cycles for ECC at various thicknesses.
INTERNATIONAL JOURNAL OF PAVEMENT ENGINEERING
(2022)
Article
Construction & Building Technology
Farah Zaremotekhases, Husam Sadek, Marwa Hassan, Charles Berryman
Summary: This study examined the mechanical performance of asphalt mixtures containing RAP using various WMA technologies, concluding that WMA mixtures with 35% RAP exhibit enhanced resistance against permanent deformations and improved cracking performance. The incorporation of higher percentages of RAP and WMA technologies contributed to better cracking resistance and fatigue life of the WMA-RAP mixtures.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Sujata Subedi, Gabriel A. Arce, Marwa M. Hassan, Michele Barbato, Louay N. Mohammad, Tyson Rupnow
Summary: The study found that with an increase in PBA content, workability and compressive strength of the composite materials decreased while surface resistivity increased. PBA composites outperformed those using FA in terms of compressive strength and surface resistivity, but exhibited shortcomings in crack-tip fracture toughness and tensile strength of the concrete.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Engineering, Civil
Ibrahim Elnaml, Momen Mousa, Marwa M. Hassan, Ipshit Idris, Louay Mohammad
Summary: One of the emerging solutions to enhance the durability of asphalt pavements is the use of High-Modulus Asphalt Concrete (HMAC). This study aimed to develop a cost-effective HMAC mixture using crumb rubber and local materials. The results showed that the HMAC mixture with 10% crumb rubber and 20% Reclaimed Asphalt Pavement (RAP) met the design specifications and outperformed the Superpave mix in terms of performance and cost-effectiveness.
TRANSPORTATION RESEARCH RECORD
(2022)
Article
Engineering, Civil
Sujata Subedi, Gabriel A. Arce, Marwa M. Hassan, Oscar Huang, Miladin Radovic, Zahid Hossain
Summary: This study characterized and evaluated the use of reclaimed fly ash and reclaimed ground bottom ash as alternative sources of supplementary cementitious materials. The results showed that both materials met the required standards and performed better than conventional fly ash in certain aspects. Therefore, reclaimed fly ash and reclaimed ground bottom ash can be important substitutes in concrete materials.
TRANSPORTATION RESEARCH RECORD
(2022)
Article
Engineering, Civil
Omar Omar, Momen R. Mousa, Marwa Hassan, Ricardo Hungria, Andrea Gavilanes, Gabriel Arce, Jose Milla, Tyson Rupnow
Summary: Implementation of self-healing concrete technologies, such as bacterial concrete, is a promising approach to enhance the durability of transportation infrastructure. This study focuses on optimizing the healing efficiency of bacterial concrete in subtropical climates by vacuum impregnation of bacteria into a lightweight aggregate. Results showed that self-healing bacterial concrete could be optimized without significant reduction in mechanical properties by impregnating Bacillus pseudofirmus bacteria at a concentration of 10(8) cells/ml and sodium lactate precursor at a concentration of 75 mM/l into the lightweight aggregate.
TRANSPORTATION RESEARCH RECORD
(2023)
Article
Engineering, Civil
Sharareh Shirzad, Ipshit Ibne Idris, Marwa Hassan, Louay N. Mohammad
Summary: The objective of this study was to develop a new generation of UV light-activated self-healing polyurethane modified asphalt binder and optimize the production parameters. The effects of the modification on rutting, fatigue cracking, and mechanical properties were evaluated. The results showed improved high-temperature grading, crack healing rate, rutting resistance, cracking resistance, elastic behavior, and fatigue performance with an increase in polymer content.
TRANSPORTATION RESEARCH RECORD
(2023)
Article
Construction & Building Technology
Sujata Subedi, Gabriel A. Arce, Marwa M. Hassan, Michele Barbato, Maria Teresa Gutierrez-Wing, Nitin Kumar
Summary: This study evaluated the properties of sugarcane bagasse ash (SCBA) obtained from different production processes for use as partial replacement of cement. The physical and chemical properties of SCBA were analyzed through various characterization techniques. The study found that LP calcinated at 650 °C and FP calcinated at 450 °C exhibited the highest strength activity index (SAI) and SiO2 + Al2O3 + Fe2O3 content, making them suitable for large-scale production of low-carbon concrete. Concrete incorporating SCBA showed decreased workability and compressive strength, but increased relative strength gain from 28 to 90 days and 90-day surface resistivity.
INTERNATIONAL JOURNAL OF PAVEMENT RESEARCH AND TECHNOLOGY
(2023)
Article
Construction & Building Technology
Ricardo Hungria, Marwa M. Hassan, Gabriel Arce, Momen Mousa, Gary King, Jose Milla, Tyson Rupnow
Summary: The main objective of this study is to evaluate and optimize the crack healing efficiency of hydrogel-encapsulated bacteria in concrete applications. Bacillus pseudofirmus was used as the bacteria strain, and different mineral precursors were combined to prepare concrete specimens at varying concentrations. The results showed that mortar samples prepared with calcium lactate at a concentration of 75 mM/L along with bacteria and yeast extract exhibited the best performance in terms of compressive strength and self-healing efficiency tests.
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2023)
Article
Engineering, Civil
Elise Mansour, Momen R. Mousa, Heena Dhasmana, Marwa Hassan
Summary: This study aims to develop a machine-learning-based framework for states with a hot and humid climate to predict the long-term field performance of asphalt concrete overlays on asphalt pavements based on key project conditions. The results indicate that machine-learning techniques have become a promising alternative to traditional performance prediction models.
TRANSPORTATION RESEARCH RECORD
(2023)
Article
Engineering, Civil
Elise Mansour, Momen R. Mousa, Marwa Hassan
Summary: This study aimed to develop a methodology to convert transverse retroreflectivity measurements to longitudinal measurements for waterborne paints in hot and humid climate conditions. The study found that two non-linear regression models were developed to predict the longitudinal retroreflectivity based on the transverse measurements, allowing for the determination of the expected service life and reliable restriping decisions for waterborne paints.
TRANSPORTATION RESEARCH RECORD
(2023)
Article
Engineering, Civil
Sujata Subedi, Marwa M. Hassan, Gabriel A. Arce, Michele Barbato, Hassan Noorvand, Louay Mohammad
Summary: This study explored the use of post-processed bagasse ash (PBA) and Class F fly ash (FA) as partial cement replacements in engineered cementitious composites (ECCs). Different compositions of FA and PBA were used to replace 60% of the cement. Various tests were conducted to evaluate the properties of the composites. Results showed that the incorporation of PBA decreased workability but improved surface resistivity. The tensile strain capacity of the composites decreased with higher PBA content, but the tensile strength remained unaffected. Achieving high ductility in the composites is challenging with a high PBA content.
TRANSPORTATION RESEARCH RECORD
(2023)
Article
Construction & Building Technology
Ricardo Hungria, Gabriel Arce, Marwa Hassan, Louay Mohammed, Moinul Mahdi, Tyson Rupnow
Summary: Ultrathin whitetopping (UTW) is a rehabilitation technique that involves pouring a thin layer of concrete on distressed asphalt pavement. Engineered cementitious composites (ECC) have been considered as an alternative to concrete due to their superior tensile ductility and fatigue resistance. Bond tests were conducted to evaluate the strength of ECC/AC and concrete/AC interfaces, and results showed that concrete had a higher bond strength with AC compared to ECC. Scanning electron microscopy-electron dispersive X-ray spectroscopy (SEM-EDS) analysis revealed a lack of hydration products at the ECC/AC interface.
INTERNATIONAL JOURNAL OF PAVEMENT RESEARCH AND TECHNOLOGY
(2023)
Proceedings Paper
Construction & Building Technology
Andrea Gavilanes, Hassan Noorvand, Sujata Subedi, Marwa Hassan
Summary: This study evaluated the influence of cellulose nanocrystal (CNC) addition on the compressive strength of engineered cementitious composites (ECC). The results showed that adding 2.0 wt.% of CNC can improve the compressive strength of ECC.
Proceedings Paper
Construction & Building Technology
Samuel Guidroz, Hassan Noorvand, Omar Omar, Sujata Subedi, Marwa Hassan
Summary: This study investigates the influence of using Portland limestone cement (PLC) on the performance of engineered cementitious composites (ECC). The experimental results indicate that using PLC can enhance the compressive strength of the mixture and shorten the setting time.
