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
Energy & Fuels
Hayder Abbas Obaid, Tameem Mohammed Hashim, Ahmed Awad Matr Al-Abody, Mohammed Salah Nasr, Ghadeer Haider Abbas, Abdullah Musa Kadhim, Monower Sadique
Summary: The rapid reduction of energy resources and the increased effects of global warming have led to a search for new techniques in paving construction. Adopting technologies like warm-mix asphalt (WMA) or asphalt recycling can have significant economic benefits and reduce environmental impact. This research focuses on studying the mechanical and durable properties of modified WMA mixtures using different additives and percentages of reclaimed asphalt pavement (RAP). The results show that these additives can greatly improve the mechanical and durable properties of WMA mixtures, promoting waste recycling in the paving industry.
Article
Construction & Building Technology
M. A. Dalhat, Sami A. Osman, Nuhu Dalhat Mu'azu, Omar Alagha
Summary: This study evaluates the potential of using oil-sludge as an oil-rejuvenator in hot mix asphalt concrete containing reclaimed asphalt pavement (RAP). The effects of different rejuvenators on the performance of RAP in asphalt concrete were analyzed. The results showed that using oil-sludge and cement treated oil-sludge as rejuvenators improved the performance of RAP-containing asphalt concrete.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Afshar Yousefi, Ali Behnood, Ata Nowruzi, Hamzeh Haghshenas
Summary: Global warming and reduced energy resources are driving the search for alternative materials and technologies for pavement construction. This research focused on investigating the mechanical and durability performance of WMA mixtures containing reclaimed asphalt pavement (RAP) with different types of additives. Results showed that the performance of the mixtures varied depending on the WMA additive, with PAWMA (R) decreasing resistance to moisture damage. Despite decreasing flexibility and cracking resistance, incorporating RAP material led to improved resistance to rutting. Mixtures containing RAP and Kaowax (R) had the highest flow number value, while those with Zeolite (R) had the lowest. Furthermore, mixtures containing RAP and PAWMA (R) showed the highest resistance to moisture damage and best resilient modulus and cracking resistance among all mixtures studied.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Gurunath Guduru, Kranthi K. Kuna
Summary: This study proposes a framework to establish allowable limits for RAP content in HMA based on indicative tests on the RAP material. The framework can be adopted by road agencies to develop limits for different mix types. The study uses fragmentation and cohesion tests to classify RAP and proposes allowable limits based on the performance characteristics of Bituminous Concrete with varying amounts of RAP. The results validate the classification approach.
MATERIALS AND STRUCTURES
(2023)
Review
Green & Sustainable Science & Technology
Samir Magar, Feipeng Xiao, Dharamveer Singh, Burhan Showkat
Summary: This review paper aims to explore the suitability and utilization of reclaimed asphalt pavement in India, addressing economic and environmental concerns and promoting sustainable development.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Green & Sustainable Science & Technology
Weiying Wang, Huailei Cheng, Lijun Sun, Yiren Sun, Ning Liu
Summary: This research evaluates the various performances of recycled warm-mix asphalt (RWMA), finding that increasing reclaimed asphalt pavement (RAP) content reduces moisture damage resistance and low-temperature performance, but this can be compensated by using warm-mix additive (WMA). By contrast, rutting resistance and fatigue performance improve with an appropriate combination of WMA additive and RAP content. Statistical analyses reveal that RAP content has the greatest impact on RWMA performance, while WMA additive type predominantly influences moisture susceptibility. The findings provide references for regulating RWMA performances by adjusting design components.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Chemistry, Physical
Nicola Fiore, Salvatore Bruno, Giulia Del Serrone, Franco Iacobini, Gabriella Giorgi, Alessandro Rinaldi, Laura Moretti, Gian Marco Duranti, Paolo Peluso, Lorenzo Vita, Antonio D'Andrea
Summary: This study investigated the use of reclaimed asphalt pavement (RAP) and a rejuvenator additive to improve the mechanical properties of hot mix asphalt (HMA) mixtures for railway sub-ballast layer. The results showed that adding RAP and the additive increased the mechanical performances, reduced production costs, and decreased environmental impacts.
Article
Chemistry, Physical
Tameem Mohammed Hashim, Mohammed Salah Nasr, Yasir Mohammed Jebur, Abdullah Kadhim, Zainab Alkhafaji, Mirza Ghouse Baig, Saheed Kolawole Adekunle, Mohammed A. A. Al-Osta, Shamsad Ahmad, Zaher Mundher Yaseen
Summary: Growing environmental pollution worldwide is mainly caused by the accumulation of liquid and solid waste. Developed countries support waste recycling policies due to their significant impact on the environment. Hot-mix asphalt mixtures (HMA) with reclaimed asphalt pavement (RAP) show excellent performance in resisting rutting. However, using a high percentage of RAP (>25%) poses a challenge due to increased stiffness. This study explores the use of various commercial and noncommercial rejuvenators to address the stiffness issue and optimize the performance of RAP mixtures in different proportions.
Article
Chemistry, Physical
Munder Bilema, Mohamad Yusri Aman, Norhidayah Abdul Hassan, Zubair Ahmed Memon, Hend Ali Omar, Nur Izzi Md Yusoff, Abdalrhman Milad
Summary: The study demonstrates that adding waste frying oil and crumb rubber to recycled mixtures containing RAP can improve asphalt mixture performance, enhance pavement sustainability and rutting performance, restore RAP properties, and increase moisture resistance damage and stiffness of asphalt mixtures.
Article
Construction & Building Technology
Di Wang, Chiara Riccardi, Babak Jafari, Augusto Cannone Falchetto, Michael P. Wistuba
Summary: This study experimentally investigated the combined use of re-recycled Reclaimed Asphalt Pavement (RAP) with Warm Mix Asphalt (WMA) on performance properties, showing promising results with a 40% RAP and WMA technology combination. Specifically, WMA-2 demonstrated better low temperature properties compared to other mixtures, indicating the feasibility of using re-recycled RAP in mix design with WMA technology.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Chemistry, Physical
Mukul Rathore, Viktors Haritonovs, Martins Zaumanis
Summary: The study found that by adding a chemical additive, WMA mixtures can reduce mixing temperature compared to HMA, and virgin WMA mixtures show better crack resistance but lower rutting resistance than HMA. Additionally, using RA material without modification deteriorates the performance of WMA mixtures, and laboratory short-term aging significantly affects mixture performance.
Article
Construction & Building Technology
Hassan Ziari, Mojtaba Hajiloo
Summary: The balanced mix design (BMD) is an alternative method to determine the Optimum Binder Content (OBC) of asphalt mixtures that considers both volumetric and performance properties. Using this method for designing asphalt mixtures with high reclaimed asphalt pavement (RAP) materials needs further investigation. The study found that the Superpave Mix Design (SMD) method may not be suitable for designing mixtures containing high-RAP materials with and without recycling agents (RAs), and these mixtures should be designed using the BMD method. Additionally, the aromatic extract RA had the most influence on rutting performance and mixtures treated with this RA showed the best cracking resistance.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2023)
Article
Construction & Building Technology
Sadegh Ghavami, Zeynab Alipour, Hamed Naseri, Hamid Jahanbakhsh, Mohammad M. Karimi
Summary: This study introduces a new method for predicting fatigue and rutting performance of reclaimed asphalt pavement (RAP) mixtures, which combines the coyote optimization algorithm and K-nearest neighbor. The proposed COA-KNN method outperforms other prediction techniques, including random forest, gradient boosting, decision tree regression, and multiple linear regression. The total binder content in asphalt mixes and the PG span of the virgin binder added to the recycled asphalt mixture have the highest relative influence on fatigue and rutting performance, respectively.
Article
Construction & Building Technology
Zaid Hazim Al-Saffar, Haryati Yaacob, Mohd Khairul Idham Mohd Satar, Mhmood Khleel Saleem, Ramadhansyah Putra Jaya, Norazah Basar, Hassanain Radhi Radeef, Norhidayah Abdul Hassan
Summary: This study explores the application of maltene as a rejuvenator to improve the performance of asphalt mixtures with reclaimed asphalt pavement (RAP) binder. By optimizing the maltene content and conducting various tests, it was found that an appropriate dose of maltene can effectively enhance the physical properties of RAP binder, leading to improved mechanical characteristics of the rejuvenated asphalt mixtures.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Dai Xuan Lu, Nhu H. T. Nguyen, Mofreh Saleh, Ha H. Bu
Summary: This study investigates the applicability of non-standardised 100mm diameter SCB test samples using experimental and numerical methods. The results show that the non-standardised sample geometry can provide reliable and repeatable results, and produce similar fracture toughness values as the standardised test.
INTERNATIONAL JOURNAL OF PAVEMENT ENGINEERING
(2021)
Article
Materials Science, Multidisciplinary
Nhu H. T. Nguyen, Ha H. Bui, Giang D. Nguyen
Article
Engineering, Geological
Nhu H. T. Nguyen, Ha H. Bui, Giang D. Nguyen
INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS
(2020)
Article
Construction & Building Technology
Dai Xuan Lu, Mofreh Saleh, Nhu H. T. Nguyen
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2020)
Article
Mechanics
Dai Xuan Lu, Ha H. Bui, Mofreh Saleh
Summary: The SCB test with 100 mm samples can effectively evaluate the fracture behavior of asphalt mixtures with NMAS up to 19 mm. While fracture toughness for the two diameters was similar, fracture energy from 100 mm samples was about 21% less than that from 150 mm samples, and cracking resistance index from the 150 mm samples was approximately 8% higher than from the 100 mm samples.
ENGINEERING FRACTURE MECHANICS
(2021)
Article
Construction & Building Technology
Yuhan Wang, Nhu H. T. Nguyen, Lianheng Zhao
Summary: Rock strainburst is a geological hazard that occurs under high triaxial stress states, and the axial stress has significant impacts on the strainburst process and micro-cracking behavior. As the axial stress increases, crack density and strainburst strength tend to increase, and there is a transition in strainburst crack mode from tensile dominated to tensile-shear mixed.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2021)
Article
Computer Science, Interdisciplinary Applications
Xin-Dong Wei, Nhu H. T. Nguyen, Ha H. Bui, Gao-Feng Zhao
Summary: A modified cohesive damage-plasticity model was developed for simulating damage evolution and fracture process in quasi-brittle materials, with correctness and feasibility verified through numerical examples and comparisons with experimental or numerical solutions.
COMPUTERS AND GEOTECHNICS
(2021)
Article
Engineering, Mechanical
Yuhan Wang, Nhu H. T. Nguyen
Summary: In this study, the effects of rock-infill interfacial contact properties on the fracture behavior of rock under uniaxial compression loads were investigated using Discrete Element Method (DEM). The results show that rocks with cohesive interfacial contacts exhibit more effective mechanical responses, and the crack process and patterns in infilled rocks are significantly influenced by the types of interfacial contacts.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2022)
Article
Construction & Building Technology
Dai Xuan Lu, Filippo Giustozzi
Summary: This study investigates the performance of asphalt concrete containing recycled plastics as synthetic aggregates in the dry mixing process. The inclusion of recycled plastics affects the compactability of the mixes and modifies the cracking and rutting behavior of asphalt mixes.
INTERNATIONAL JOURNAL OF PAVEMENT ENGINEERING
(2022)
Article
Engineering, Mechanical
Dai Xuan Lu, Nhu H. T. Nguyen, Ha H. Bui
Summary: Asphalt concrete shows great dependence on loading rates and time in terms of its mechanical behavior, which poses a challenge for numerical methods. This study proposes a new modelling approach using the discrete element method (DEM) to capture the behavior of asphalt concrete under different loading rates and durations. A new inter-particle contact model is developed for the DEM, which can describe the rate and time dependency, viscoelastic damage, and plastic-damage behavior of asphalt concrete. The proposed approach demonstrates its effectiveness through comparisons and verifications with a wide range of experiments, and it can provide insights into the failure mechanisms and transitional behaviors of asphalt material.
INTERNATIONAL JOURNAL OF PLASTICITY
(2022)
Article
Green & Sustainable Science & Technology
Yeong Jia Boom, Marie Enfrin, Dai Lu Xuan, Stephen Grist, Dilan Robert, Filippo Giustozzi
Summary: Recycled plastic modified asphalt is a new topic in the road construction industry. This study investigated the use of four types of recycled plastic in asphalt and found that except for the mixture at 180 degrees Celsius, adding recycled plastic can effectively reduce overall emissions.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Construction & Building Technology
Dai Xuan Lu, Marie Enfrin, Yeong Jia Boom, Filippo Giustozzi
Summary: The recyclability of reclaimed asphalt pavement (RAP) from conventional asphalt concrete has been extensively studied. However, there is still uncertainty about the recyclability of plastic-modified asphalt at the end of its service life (P-RAP). This is mainly due to the lack of aged P-RAP material from the field, indicating that the use of recycled plastics in asphalt is still in the research phase. This study aims to evaluate the future recyclability of P-RAP and found that it can be fully recycled and provides similar performance to standard RAP mixes.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Engineering, Civil
Zhiyuan Zhang, Dai Xuan Lu, Yaning Qiao, Filippo Giustozzi
Summary: This study introduces a novel numerical approach combining the discrete element method (DEM) and computational fluid dynamics (CFD) to model the hydraulic performance of porous asphalt (PA) pavements. The results showed that the proposed approach is capable of producing virtual test samples resembling the laboratory PA sample structure for hydraulic performance tests.
JOURNAL OF HYDROLOGY
(2023)
Article
Environmental Sciences
Yeong Jia Boom, Dai Lu Xuan, Marie Enfrin, Michael Swaney, Hassan Masood, Biplob Kumar Pramanik, Dilan Robert, Filippo Giustozzi
Summary: The use of recycled plastic in asphalt has gained interest for its potential to increase the sustainability of road pavements. This research evaluates the mechanical behavior and environmental impact of incorporating low melting point recycled plastics, such as low density polyethylene and commingled polyethylene/polypropylene, into conventional hot mix asphalt. The study shows that while moisture resistance decreases by 5-22% with increasing plastic content, there is a significant increase in fatigue resistance by 150% and rutting resistance by 85% compared to conventional asphalt. Furthermore, the production of high-temperature asphalt with higher plastic content leads to decreased gaseous emissions by up to 21%. Comparisons also suggest that microplastic generation from recycled plastic-modified asphalt is similar to that from commercial polymer-modified asphalt products commonly used in the industry. Overall, the use of low melting point recycled plastics as an asphalt modifier offers promising engineering and environmental benefits compared to conventional asphalt.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Construction & Building Technology
Qi Jiang, Wei Liu, Shaopeng Wu, Xuanwen Gou
Summary: This study analyzes the erosion mechanisms of NaCl solution on asphalt concrete and finds that NaCl solution softens asphalt and promotes the intrusion of crystalline salt into it. Salt crystallization alters the surface roughness of aggregates, resulting in a decrease in skid resistance but an improvement in compressive strength. Additionally, the concentration of NaCl solution initially has no significant impact on the mechanical performance of asphalt concrete, but its domination gradually increases with the intensification of cyclic effects.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Lili Kan, Lan-qing Dai, Ning Kong, Bin Peng, Fei Wang
Summary: This paper investigates the effect of freezing and thawing cycles on the tensile behavior of cracked ultra-high performance concrete (UHPC). The results show that long-term freezing and thawing action deteriorates the cracking strength, tensile strength, tensile strain, and strain energy of cracked UHPC. On the other hand, the action of water generally favors the development of tensile properties of UHPC. The crack distribution tends to be unsaturated under freezing and thawing environment, and the re-hydration reaction is hindered. The pore structure near the crack varies under different environments.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Xin Xiao, Jingwei Li, Qingke Meng, Xiangshan Hou, Yanhui Liu, Xujiang Wang, Wenlong Wang, Shengtao Lu, Yuzhong Li, Yanpeng Mao, Tong Li
Summary: Preparing gypsum-based self-leveling mortar (GSLM) using beta-hemihydrate gypsum and solid wastes-derived sulfoaluminate cement (WSAC) can improve the mechanical performance of the mortar, but phosphorus impurities can weaken the hydration speed and degree.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Sihang Bao, Junzhen Di, Yanrong Dong, Ziqing Gao, Qing Gu, Yuanfang Zhao, Hongyu Zhai
Summary: Tailings dam break and leakage accidents pose a threat to the safety of people in mining areas and cause severe environmental pollution. This study focuses on solidifying tailing sand using microbial induced calcite precipitation (MICP) to improve strength and fix heavy metals. The curing time of MICP bio-cemented tailings is found to significantly impact the strength of tailings, while its effect on heavy metal fixation is minimal. The optimized MICP curing time is 10 days, resulting in improved strength and cementation of tailings particles.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Ferhat Benmahiddine, Fares Bennai, Achraf Charaka, Ameur El Amine Hamami, Abdelkader Tahakourt, Rafik Belarbi
Summary: This paper studied the effects of hysteresis on the hygrothermal behavior at the building scale. Through laboratory validation and numerical simulations, it was found that hysteresis has a significant impact on the relative humidity and total heat fluxes in buildings, while it does not have a noticeable effect on temperature variations.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
You Gao, Wei He, Xiayang Zhang, De'an Sun, Pei Li
Summary: This study determined the boundary line between the swelling and compression deformation zone in lateritic clay through wetting tests, and proposed a simple bimodal SWRC model. It also found that the existing strength model underestimated the tested values in the medium to high suction range, therefore a segmented strength equation was introduced for enhanced predictions of the strength properties of lateritic clay.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Prabhath Ranjan Kumar Soda, Asheer Mogal, Kalyan Chakravarthy, Nikhil Thota, Nimish Bandaru, Sanjay Kumar Shukla, K. M. Mini
Summary: This study investigates the use of encapsulated bacteria to improve the self-healing ability of concrete. Through various tests, it is found that using 20% cement-coated alginate beads (CCAB) and 5% nanosilica (NS) can achieve optimal strength and healing. This research is significant for enhancing the durability of concrete.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Shizhe Wang, Haiping Wu, Wen Yang, Wei Wang, Zhibo Zhu, Kun Nie, Luoxin Wang, Hua Wang, Jing Wu
Summary: In this study, photothermal-heat storage concrete (PHSC) was developed with excellent photothermal conversion performance and heat storage capacity. By absorbing and storing solar energy during the day and releasing it at night, PHSC can effectively reduce energy consumption in buildings.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Robin Deb, Jialuo He, Geetika Mishra, Yaghoob (Amir) Farnam
Summary: Incorporation techniques of phase change materials in cementitious composites have a significant influence on thermal properties. This study investigated the thermal behavior of low-temperature PCM when subjected to varying temperature change rates and pore confinement inside the porous network of lightweight aggregates. The results showed that ramp rates affect the nucleation and crystallization growth process during the phase transition, and the pore structure of the aggregates affects the supercooling phenomenon and confinement pressure of the PCM.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Eduardo Ferreira, Payam Sotoudeh, Dagmar Svecova
Summary: This study investigates the fatigue behavior of concrete under different stress reversal conditions. The results indicate that stress reversal generally causes more severe damage and reduces the cycles to failure compared to tensile fatigue. Additionally, adding some level of compression contributes to the energy required for failure under stress reversal fatigue. Specimens with higher concentration of fractured aggregates achieve longer fatigue lives.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Mag Raj Gehlot, Sandeep Shrivastava
Summary: This study evaluates the compatibility relationship between plaster bonds and the substrate under an accelerated aging environment, and finds that incorporating an appropriate amount of granite cutting waste can improve the strength parameters and adhesion of the cement mortar.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Min Zhang, Qirui Luo, Mingke Deng, Shixing Zhao
Summary: This study investigated the bond behavior between carbon FRCM composites with added short fibers and concrete substrates. The effects of different factors were considered and 36 specimens were tested and discussed. The experimental results were analyzed in terms of failure mode, load-slip curve, and characteristic parameters, and the contribution of weft yarns was taken into account in the developed bondslip model.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Dengkai Liu, Hongniao Chen, Ray Kai Leung Su
Summary: The susceptibility of building stones to fire and high temperature was investigated in this study by examining their physical and mechanical properties. The results show that both compressive and tensile properties of stones are affected by temperature changes. The tensile strength is particularly sensitive to temperature changes, requiring special attention to the components subjected to tensile stress in stone buildings. Principal component analysis was used to predict the mechanical properties of stones, providing a new method for calculating the residual mechanical properties after high temperature or fire.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Joso Maria Raposo, Eduardo Cavaco, Luis Costa Neves, Eduardo Julio
Summary: This paper investigates the correlation between the friction coefficient and the surface roughness of concrete-to-concrete interfaces. Experimental tests were performed on specimens with different surface treatments, and the surface roughness parameters were analyzed and correlated with the shear strength and friction coefficient. The results showed that certain roughness parameters had a strong positive correlation with the friction coefficient, while others had little or no correlation. A novel combined roughness parameter with optimized correlation was proposed.
CONSTRUCTION AND BUILDING MATERIALS
(2024)
Article
Construction & Building Technology
Chiara Riccardi, Massimo Losa
Summary: The interest in using bio materials in asphalt pavements is growing due to economic reasons and environmental benefits. This study aimed to review the use of bio extenders as additives in binders, with a focus on replacements greater than 20% of fossil binder. The properties of bio-extended binders were found to vary substantially depending on the biomass source and production process.
CONSTRUCTION AND BUILDING MATERIALS
(2024)