Article
Construction & Building Technology
Han Zhao, Junda Ren, Zhuo Chen, Hai Luan, Junyan Yi
Summary: The use of cold recycling mixtures with foamed asphalt is an environmentally-friendly construction technology for pavement rehabilitation, but in cold regions, the impact of water on the mixtures can lead to freeze-thaw durability issues. Research on structural frozen-resistant protection behaviors and advanced material design is needed for future improvements in durability.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2021)
Article
Construction & Building Technology
Syed Ahmed Kazmi, Benjamin F. Bowers, Brian K. Diefenderfer
Summary: This study investigated the effect of laboratory simulated stockpiling on the strength properties of a CCPR mixture that used foamed asphalt as a recycling agent. The results showed a significant decrease in tensile strength and dynamic modulus within the first three days of stockpiling, but little effect on pavement performance prediction.
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2021)
Article
Construction & Building Technology
Saed N. A. Aker, Hasan Ozer
Summary: Cold recycling technology is a sustainable solution for pavement construction, allowing for the recycling of up to 100% of existing materials. This study introduces a new approach to designing emulsion-based cold recycling mixtures, focusing on optimizing components and evaluating long-term performance. By altering aggregate gradation, selecting optimum moisture content, and determining residual asphalt content, the proposed design method shows promising results in terms of strength, void reduction, and permanent deformation resistance. Rating: 8/10
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
P. Orosa, I. Perez, A. R. Pasandin
Summary: The cold in-place recycling (CIR) method is suitable for circular economy, and triaxial tests are effective for studying the mechanical behavior of cold mixtures. Results showed that a moderate binder content provided adequate cohesion, while an excess reduced internal friction. The mix with 2.50% binder exhibited the best response in repeated load permanent deformation tests.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Engineering, Civil
Jhony Habbouche, Ilker Boz, Brian K. K. Diefenderfer, David Jones, Adam J. T. Hand
Summary: The currently used proxy tests are not sufficient for assessing the quality and stability of recycled pavements. The lack of sound and rapid tests limits the use of recycling techniques. This study evaluates the viability of simple and practical stiffness, deformation resistance, and penetration resistance tests for characterizing asphalt-treated cold recycled mixtures.
TRANSPORTATION RESEARCH RECORD
(2022)
Article
Construction & Building Technology
Joao Paulo Costa Meneses, Kamilla Vasconcelos, Linda Lee Ho, Liedi L. B. Bernucci
Summary: This paper evaluated the adequacy of different triaxial resilient modulus (TxRM) models for cold recycled asphalt mixtures (CRAMs) with different compositions, aggregate gradation, and physical characteristics. Three different models were selected based on the literature, and non-linear estimation was performed using the Levenberg-Marquardt algorithm. The most suitable model for CRAM's TxRM modeling was found to be Ni et al.'s model based on RSSR analysis. The model selection was independent of factors such as aggregate gradation, binder type/content, air void content, RAP content, TxRM values range, active filler type, and curing time of the tested specimens.
ROAD MATERIALS AND PAVEMENT DESIGN
(2023)
Article
Construction & Building Technology
Andre Kazuo Kuchiishi, Kamilla Vasconcelos, Liedi Legi Bariani Bernucci
Summary: The mechanical behavior of cold recycled asphalt mixtures (CRAMs) is influenced by the composition of the mixture, especially the type and content of bitumen stabilizing agents and active fillers. Triaxial resilient modulus and dynamic modulus tests show that the type and content of these components significantly affect the behavior of the CRAM. Mixtures with cement addition exhibit behavior similar to cementitious materials, while those with hydrated lime behave like granular materials. Dynamic modulus tests also reveal viscoelastic properties and differences between mixtures stabilized with asphalt emulsion and foamed asphalt.
INTERNATIONAL JOURNAL OF PAVEMENT ENGINEERING
(2021)
Article
Materials Science, Characterization & Testing
Nusrat Nazim Jhora, Farshad Kamran, Taher Baghaee Moghaddam, Leila Hashemian
Summary: This study investigated the effect of adding waste material, asphaltenes, as a modifier to recycled asphalt mixtures with different contents of reclaimed asphalt pavement (RAP). Mechanical properties of the modified mixtures were evaluated using various tests. The results showed that the addition of asphaltenes improved the strength of the mixtures but potentially increased the risk of cracking. The asphaltene-modified mixtures exhibited significantly better resistance to cracking at low temperatures compared to the unmodified mixtures, while the differences between the modified and unmodified mixtures were not significant at intermediate and high temperatures. The best-performing mixture had 100% RAP with 1% asphaltenes.
JOURNAL OF TESTING AND EVALUATION
(2023)
Article
Materials Science, Characterization & Testing
Nusrat Nazim Jhora, Farshad Kamran, Taher Baghaee Moghaddam, Leila Hashemian
Summary: This study investigates the addition of waste material, asphaltenes, as a modifier to recycled asphalt mixtures containing different contents of reclaimed asphalt pavement (RAP). The results show that asphaltenes improve the strength of the mixtures, but may increase the risk of cracking. The modified mixtures exhibit better cracking resistance at intermediate temperatures and rutting resistance at high temperatures. However, the improvements are not significant.
JOURNAL OF TESTING AND EVALUATION
(2023)
Article
Green & Sustainable Science & Technology
Katia Aline Bohn, Liseane Padilha Thives, Luciano Pivoto Specht
Summary: With the rapid expansion of road networks, the asphalt industry is facing environmental challenges that require exploring new solutions. This study evaluated asphalt binder samples incorporating Warm Mix Asphalt (WMA) and Reclaimed Asphalt Pavement (RAP). The findings showed that the WMA-RAP combination increased asphalt stiffness and resistance to permanent deformation.
Article
Construction & Building Technology
Purbayan Ghosh Mondal, Bharath Gottumukkala, Kranthi K. Kuna
Summary: This study investigated the deformation behavior of foamed bitumen stabilized mixes incorporating recycled asphalt pavement material, comparing it with conventional hot mix asphalt. The results showed that these mixes behave similarly to HMA in terms of permanent deformation, but are less temperature-sensitive.
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2021)
Article
Materials Science, Multidisciplinary
Haisheng Zhao, Jianming Su, Shijie Ma, Chunhua Su, Xiaoyan Wang, Zengguang Li, Jincheng Wei, Shiping Cui
Summary: This study investigated six types of Cold Recycled Mixture (CRM) with different compositions and asphalt binders. The test results showed that all CRMs met the specifications, with the emulsified asphalt CRM performing better than the foamed asphalt CRM. However, the performance of the samples taken from the field trial section was lower than that in the laboratory, indicating that the curing conditions in the field were not as effective.
Article
Engineering, Civil
Ahmed Saidi, Ayman Ali, Yusuf Mehta, Christopher J. Decarlo, Mohamed Elshaer
Summary: The performance of full-scale cold in-place recycled (CIR) asphalt sections was evaluated using accelerated pavement testing (APT). A balanced mix design approach was used to optimize the binder contents of CIR mixtures, and these mixtures were tested in three full-scale sections. Results showed that the CIR section with 2% binder content performed best in terms of rutting under truck loading, while the section with 3% binder content had the highest cracking resistance under accelerated truck and aircraft loading.
JOURNAL OF TRANSPORTATION ENGINEERING PART B-PAVEMENTS
(2022)
Article
Construction & Building Technology
Yuanyuan Pan, Hui Guo, Wei Guan, Yongli Zhao
Summary: Rutting is a common problem in asphalt pavements that can lead to ride safety concerns, deterioration, and increased maintenance costs. Factors affecting rutting resistance were investigated through wheel tracking tests, including internal factors (aggregate gradation, asphalt content, and layer thickness), external factors (temperature and traffic loading), and human factors (compaction degree). The results showed that rutting resistance can be improved by designing a tightly interlocked aggregate skeleton, using an optimal asphalt content, achieving sufficient compaction, maintaining a specific layer thickness, using an asphalt softening point higher than pavement temperature, and avoiding overloaded vehicles. In highly rutted areas, it is recommended to use stone mastic asphalt or styrene-butadiene-styrene modified asphalt with specific properties.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2023)
Article
Construction & Building Technology
Bao Li, Ning Li, Xin Yu, Jianguang Xie, He Zhan, Jian Ding, Hui Ma
Summary: The aging performance and durability of foamed warm mix asphalt (FWMA) have not been fully studied. This study examined and evaluated the performance variation of FWMA compared to conventional hot mix asphalt (HMA) under long-term service conditions. The results showed that the aging resistance of FWMA was slightly diminished under construction conditions with no temperature reduction, but improved at high temperatures and deteriorated at low temperatures with increased service time. The foaming water and service time were primary determinants of the aging and rheological properties of FWMA.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2023)
Article
Construction & Building Technology
Talita de Freitas Alves, Paulo Andre Moraes Pereira, Rosangela Motta, Kamilla Vasconcelos, Jamilla Lutif Teixeira, Liedi Bernucci
Summary: This paper investigates the mechanical response of railway tracks using bituminous subballast (BS) through numerical modeling. The results show that the use of BS reduces displacements on foot-of-rail and stresses on the subgrade, and different air voids content in bituminous mixtures has a negligible effect on the overall track response.
ROAD MATERIALS AND PAVEMENT DESIGN
(2022)
Article
Construction & Building Technology
M. F. Oliveira, I. S. Bessa, R. R. Vasconcelos, K. L. Vasconcelos, L. L. B. Bernucci
Summary: This paper discusses the importance of pavement structures and factors affecting them, proposes a new laboratory compaction method, and evaluates its effectiveness. The results show that the compaction method significantly affects the performance of the mixture, with discontinuities in aggregate gradation leading to negative impacts.
INTERNATIONAL JOURNAL OF PAVEMENT ENGINEERING
(2022)
Article
Construction & Building Technology
Patricia B. B. Silva, Sergio C. Angulo, Rosangela Motta, Liedi L. B. Bernucci
Summary: Cement addition and pozzolanic reaction in recycled aggregates from construction and demolition waste can chemically stabilize pavement base layers. This study established a mix of recycled cementitious and red ceramic-waste aggregates with hydrated lime to enhance pozzolanic reactivity and achieve better mechanical properties compared to portland cement or recycled concrete aggregate itself. Chemical, physical, and mechanical tests were conducted, demonstrating that the pozzolanic reaction of cementitious and red ceramic aggregates with hydrated lime achieved mechanical properties closer to those achieved by a portland cement stabilized pavement base.
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2023)
Article
Construction & Building Technology
Maria Jose Castro-Alonso, Leidy V. V. Espinosa, Paulo Ricardo Franco Marcelino, Kamilla Vasconcelos Savasini, Julio Cesar Dos Santos, Raquel Moraes, Silvio Silverio da Silva, Liedi L. B. Bernucci
Summary: This study characterized two bio-binders (Bio A and Bio B) derived from pine wood resins and designed for full replacement of asphalt binder. Various analytical techniques were used to evaluate the studied materials, including elemental analysis, FTIR, GC-MS, TGA, and rheological testing. The susceptibility to aging was assessed by comparing unaged and short-term aged samples of the binders. Bio A exhibited a penetratio grade of 29 (0.1 mm) and a softening point of 55.2 degrees C, while Bio B had a penetration grade of 21 (0.1 mm) and a softening point of 57 degrees C. AC 30/45 showed a penetration grade of 30 (0.1 mm) and a softening point of 55 degrees C. Bio B was found to be more prone to aging, potentially due to the higher content of saturated fatty acid methyl esters.
ROAD MATERIALS AND PAVEMENT DESIGN
(2023)
Article
Construction & Building Technology
Leidy V. Espinosa, Kamilla Vasconcelos, Allex E. Alvarez, Amit Bhasin, Liedi Bernucci
Summary: Limited research has been conducted on the characteristics and performance of paving mixtures made with 100% bio-binders. This paper evaluates the moisture damage susceptibility of wood-based bio-binder-aggregate interfaces and compares it to neat and highly modified asphalt binders. The results indicate that the bio-binder has similar or higher moisture damage resistance compared to traditional asphalt binders.
ROAD MATERIALS AND PAVEMENT DESIGN
(2023)
Article
Construction & Building Technology
Karina Suzuki, Kamilla Vasconcelos, Luis Miguel Klinsky, Iuri Bessa
Summary: This research examines the use of recycled asphalt mixtures (RAMs) as a wearing course in heavily trafficked highways. The study investigates the impact of different percentages of recycled asphalt pavement (RAP) and the addition of a recycling agent (RA) on the mechanical properties of RAMs. RAMs with varying RAP contents (10%, 20%, 25%, 35%, 50%, and 65%) were evaluated, and the effects of the RA on two specific mixtures (25% and 50% RAP content) were also studied. The results show that conditioning the RAP during production influences the activation of the RAP binder and the mechanical behavior of the mixtures. RAMs with higher RAP contents exhibit better resistance to permanent deformation and fatigue cracking due to the activation of the RAP asphalt binder. Additionally, the inclusion of the RA enhances fatigue resistance without compromising rutting resistance for higher RAP contents.
ROAD MATERIALS AND PAVEMENT DESIGN
(2023)
Article
Engineering, Civil
Ana Luisa Aranha, Liedi Legi Bariani Bernucci, Kamilla L. Vasconcelos
Summary: Data preprocessing, hyperparameter selection, and time series size significantly affect the performance metrics of machine learning algorithms in behavior prediction in the field of engineering. This study analyzes the performance of three ML algorithms (support vector machine, random forest, and artificial neural network) on predicting maximum deflection and international roughness index, finding that artificial neural network is the most accurate technique.
TRANSPORTATION RESEARCH RECORD
(2023)
Article
Engineering, Civil
Leidy V. Espinosa, Julia A. Rodrigues, Kamilla Vasconcelos, Liedi Bernucci, Simon Pouget
Summary: The use of bio-oils and biobinders in recycled asphalt mixtures has attracted attention due to their ability to incorporate more recycled material while reducing new asphalt binder consumption. Concerns about the overall performance of the recycled mixture have prompted investigations to optimize the restoration of aged binder properties. This study verifies blending charts based on high performance grade (HPG) temperature and shows that a commercial plant-based binder can effectively restore and improve the properties of aged asphalt binders.
TRANSPORTATION RESEARCH RECORD
(2023)
Article
Construction & Building Technology
Julia A. Rodrigues, Kamilla L. Vasconcelos, Amy Epps Martin, Edith Arambula-Mercado, Eyad Masad
Summary: This study investigates the effect of multiple recycling on binder properties in reclaimed asphalt pavement (RAP) and simulates the aging process of binders in RAP. The results show that the binder can be reused up to three cycles while maintaining good performance, but attention should be given to the cumulative effect of bio-oils.
ROAD MATERIALS AND PAVEMENT DESIGN
(2023)
Article
Multidisciplinary Sciences
Zila Maria Garcia Mascarenhas, Igor Amorim Beja, Kamilla Lima Vasconcelos, Liedi Legi Bariani Bernucci
Summary: Heavy traffic and high temperatures can cause rutting in paved areas, but this can be reduced by using large-stone asphalt mixtures (LSAMs) as intermediate layers. LSAM is asphalt concrete with a nominal maximum aggregate size of at least 25 mm. Three LSAMs were designed using different compaction methods and varying compaction energy. The parameters evaluated, such as asphalt content and locking point, are important in LSAM design.
ACTA SCIENTIARUM-TECHNOLOGY
(2023)
