Article
Construction & Building Technology
Yunhong Yu, Chenguang Shi, Gang Xu, Zeheng Yao, Tianling Wang, You Wu, Xingyu Yi, Houzhi Wang, Jun Yang
Summary: This study investigates the accuracy of nanoindentation in characterizing the aging behavior of asphalt materials and combines it with DSR frequency sweep tests to macroscopically characterize the aging behavior of asphalt mastic. The results validate the accuracy of nanoindentation in characterizing aging performance and show that aging becomes more pronounced closer to the road surface.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Polymer Science
Muhammad Ansar, Muhammad Ali Sikandar, Fadi Althoey, Muhammad Atiq Ur Rehman Tariq, Saleh H. Alyami, Samah Elsayed Elkhatib
Summary: The deterioration of asphalt pavements due to heavy vehicle loads and climatic variations requires the use of construction materials with excellent resilience, resistance to permanent deformation, and longer service life. This study investigates the effects of polycarbonate (PC) and polytetrafluoroethylene (PTFE) modifiers on the performance of bitumen penetration grade (PG) 70 in hot mix asphalt (HMA) pavements against rutting, fatigue, and high temperature cracking. The results show that the modification of neat bitumen with PC and PTFE increases viscosity and rigidity, resulting in improved resistance to permanent deformation and cracking.
Article
Biochemistry & Molecular Biology
Yerdos Ongarbayev, Ainur Zhambolova, Yerbol Tileuberdi, Zulkhair Mansurov, Cesare Oliviero Rossi, Pietro Calandra, Bagdat Teltayev
Summary: This paper examines the impact of aging processes on the viscoelastic characteristics of vacuum residue oxidation products modified with crumb rubber. The study finds that short-term aging increases the shear modulus of the samples, and the modified vacuum residue oxidation product with crumb rubber shows the highest rutting and fatigue parameters, indicating increased stiffness and elasticity. The research also reveals an expansion of the temperature range of plasticity for the modified product.
Article
Construction & Building Technology
Yi Su, Shan Tang, Meng Cai, Yu Nie, Bo Hu, Shujuan Wu, Cheng Cheng
Summary: This study investigates the influence and mechanism of lignin on the thermal-oxidative aging of bitumen, and finds that lignin-modified bitumen exhibits better aging resistance.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Charles Miller, Christopher DellaCorte, Min Zou
Summary: The nanomechanical properties of hardened 60NiTi were studied using nanoindentation, revealing that the Ni3Ti phase has higher hardness and elastic modulus. The presence of Ni3Ti may indicate reduced amounts of Ni4Ti3, leading to lower overall hardness of the material.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Chemistry, Multidisciplinary
Simone Bagatella, Riccardo Ciapponi, Stefano Turri
Summary: Polyhydroxyalkanoates are a promising class of biopolymers that can allow the production of sustainable plastic materials. The study found that nanoindentation with the Atomic Force Microscope allows an estimation of the Elastic Modulus, which can be useful for preliminary measurement when only a limited amount of material is available.
APPLIED SCIENCES-BASEL
(2022)
Article
Construction & Building Technology
Kristina Hofer, Johannes Mirwald, Daniel Maschauer, Hinrich Grothe, Bernhard Hofko
Summary: The aging of bitumen is a major contributor to asphalt pavement failure. Existing aging methods do not take into account atmospheric parameters such as nitrogen oxides and ozone, which play a significant role in bitumen aging.
MATERIALS AND STRUCTURES
(2022)
Article
Plant Sciences
Harinderbir Kaur, Jean-Marie Teulon, Christian Godon, Thierry Desnos, Shu-wen W. Chen, Jean-Luc Pellequer
Summary: The plasticity and growth of plant cell walls under metal stress were investigated using atomic force microscopy (AFM). The combination of Fe2+ and Al3+ ions resulted in root-extension arrest and increased cell wall stiffness, while single Fe2+ or Al3+ ions only induced stiffness increase without root growth arrest.
PLANT CELL AND ENVIRONMENT
(2023)
Article
Construction & Building Technology
Xiaohu Lu, Peter Sjovall, Hilde Soenen, Johan Blom, Michalina Makowska
Summary: Oxidative aging of bitumen leads to decreased aromatic fractions and increased resins and asphaltenes. Wax-containing bitumen exhibits bee-like structures on the surface, while non-waxy bitumen does not show any structures.
ROAD MATERIALS AND PAVEMENT DESIGN
(2022)
Article
Construction & Building Technology
Anand Sreeram, Ahmad Masad, Zahra Sootodeh Nia, Daniel Maschauer, Johannes Mirwald, Bernhard Hofko, Amit Bhasin
Summary: Efficient and practical techniques for simulating aging of asphalt mixtures are important for practitioners worldwide. This study developed a laboratory procedure for accelerated aging of loose asphalt specimens using highly oxidative gas, and the results showed promising chemomechanical correlations between the ROS aging method and conventional aging methods. The procedure serves as a proof of concept and provides encouraging results for further development and standardization.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Polymer Science
Marius Pustan, Corina Birleanu, Rodica Voicu, Raluca Muller
Summary: This study investigates the effect of temperature on the mechanical and tribological properties of SU-8 polymer. The results show that increasing temperature leads to a decrease in the modulus of elasticity and hardness, while increasing the adhesion and friction forces. Additionally, hard baking at high temperature increases the modulus of elasticity and hardness, and decreases the adhesion and friction forces of the polymer.
Article
Chemistry, Physical
Claudia Vazquez Sanz, Ignacio Rodriguez, Francisco Forriol, Elena Tejado, Francisco J. Lopez-Valdes
Summary: In this study, the relationship between the mechanical properties and chemical composition of bone with age in bovine and ovine animals was investigated. Compositional analysis and nanoindentation analysis were performed on bone tissue samples. The results showed significant differences in calcium content and elastic modulus between species, but no differences within each species with development. A multiple linear regression model found several significant relationships between the elastic modulus, the decrease in phosphorus and carbon content, animal species, and development.
Article
Engineering, Environmental
Amirul Rajib, Shadi Saadeh, Pritam Katawal, Barzin Mobasher, Elham H. Fini
Summary: This study found that biochar can delay aging in asphalt and mixtures, with varying effectiveness depending on the type of aging. Biochar is more effective for oxidation aging in rubberized asphalt, while neat asphalt benefits more from biochar in UV aging.
RESOURCES CONSERVATION AND RECYCLING
(2021)
Article
Construction & Building Technology
Kristina Hofer, Stefan Werkovits, Paul Schoenauer, Johannes Mirwald, Hinrich Grothe, Bernhard Hofko
Summary: An accurate simulation of aging behavior is crucial for predicting the performance of bituminous products. This study compared the Pressure Aging Vessel (PAV) and Viennese Binder Aging (VBA) methods to field aging, and found that neither method could fully replicate the aging level, but a better approximation was achieved compared to the standard procedure. Spectroscopic analysis showed a high correlation between VBA and field aged samples, indicating that VBA method provided a better qualitative simulation of the chemical properties of the field sample.
ROAD MATERIALS AND PAVEMENT DESIGN
(2023)
Article
Construction & Building Technology
Chao Li, Xiaofeng Xie, Lan Wang, Yingying Guo, Le Zhang, Zhihua Xue
Summary: This study investigates the changes and relationship between micro and macro properties of base bitumen and styrene-butadiene-styrene (SBS)-modified bitumen during aging. The results show that aging leads to oxidation of bitumen and degradation of SBS molecules in SBS modified bitumen. The addition of SBS modifier can reduce these changes and improve the aging resistance of modified bitumen. Furthermore, the thermal stability of bitumen improves while the phase transformation heat absorption decreases during aging.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Energy & Fuels
Max Berkowitz, Matthew Filipovich, Alejandra Baldi, Simon A. M. Hesp, Jose P. Aguiar-Moya, Luis G. Loria-Salazar
Article
Engineering, Civil
Ana Vargas-Sobrado, Luis Rodriguez-Solano, Jose Aguiar-Moya, Henry Hernandez-Vega, Luis Loria-Salazar
TRANSPORTATION RESEARCH RECORD
(2019)
Article
Engineering, Civil
Edgar Camacho-Garita, Robinson Puello-Bolano, Piero Laurent-Matamoros, Jose P. Aguiar-Moya, Luis Loria-Salazar
TRANSPORTATION RESEARCH RECORD
(2019)
Article
Construction & Building Technology
Tania Avila-Esquivel, Jose Pablo Aguiar-Moya, Edgar Camacho-Garita, Luis Loria-Salazar
Summary: The initial full-scale experiment in Costa Rica under the program PaveLab aimed to identify the impact of typical construction practices on pavement stability, as well as the importance of moisture in this regard. Preliminary results highlighted the significance of moisture on pavement stability and the effects of different materials and thicknesses on structural capacity.
INTERNATIONAL JOURNAL OF PAVEMENT ENGINEERING
(2021)
Article
Materials Science, Characterization & Testing
Edgar Camacho-Garita, J. P. Aguiar-Moya, T. Avila-Esquivel, L. Loria-Salazar
JOURNAL OF TESTING AND EVALUATION
(2020)
Article
Construction & Building Technology
Daybis Tencio, Alejandra Baldi, Jose P. Aguiar-Moya, Ana-Luisa Elizondo-Salas
Summary: This study aims to reduce the variability of surface energy data for mineral aggregates in goniometry by controlling surface preparation, correcting for surface roughness, and achieving quasi-equilibrium. Factors such as the type of mineral aggregate and variables affecting sample surface preparation were found to have a greater effect on contact angle values. This study helps ensure a more accurate determination of surface energy in mineral aggregates.
ROAD MATERIALS AND PAVEMENT DESIGN
(2023)
Article
Engineering, Chemical
D. Tencio, A. Baldi-Sevilla, J. Aguiar-Moya
Summary: This paper investigates the behavior of surface energy and its dispersive and polar components on the total surface free energy, as well as the impact of surface topology on contact angle measurements. The findings provide a fundamental and practical basis for applications in heterogeneous solids, particularly in construction and filling materials.
INTERNATIONAL JOURNAL OF ADHESION AND ADHESIVES
(2022)
Article
Construction & Building Technology
Rafael Ernesto Villegas-Villegas, Alejandra Baldi, Jose P. Aguiar-Moya, Luis Loria-Salazar, Fabiola Miranda Arguello
Summary: Fatigue damage is affected by low-temperature conditions, and the relationship between fatigue and temperature needs to be studied. Oxidation is known to make asphalt brittle, and it is usually associated with fatigue. This study aims to propose a tool that can connect the chemistry and rheology of asphalt.
ROAD MATERIALS AND PAVEMENT DESIGN
(2023)
Article
Engineering, Civil
Jaime Allen, Ana C. Vargas-Sobrado, Jose P. Aguiar-Moya, Henry Hernandez-Vega
Summary: In Costa Rica, the reinstatement of weigh stations for trucks and commercial vehicles in 2008 led to a stabilization of excess loading in heavy vehicles and a reduction in variability of truck equivalency factors. Statistical analysis of weight data collected from different stations across the national road network between 2008 and 2011 showed that the truck equivalency factors for C2, C3, and T3-S2 vehicles tended to stabilize at 0.20, 0.66, and 1.19, respectively. The implementation of higher weight enforcement on the tandem axle of T3-S3 vehicles resulted in a decrease of 0.17 in the truck equivalency factor. These findings can guide other countries in considering the benefits of weigh station implementation in controlling truck traffic and minimizing pavement damage.
JOURNAL OF TRANSPORTATION ENGINEERING PART B-PAVEMENTS
(2023)
