Article
Green & Sustainable Science & Technology
Ahmed S. Mohamed, Zhenglong Cao, Xiyong Xu, Feipeng Xiao, Talaat Abdel-Wahed
Summary: Rejuvenating reclaimed asphalt pavement with crumb rubber modified binder enhances the overall performance of the binder by improving cohesion strength, rutting resistance, creep resistance, and colloid homogeneity. However, excessive dosages of crumb rubber and reclaimed asphalt may undermine fatigue cracking resistance.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Green & Sustainable Science & Technology
Yifu Meng, Liping Liu, Weiqi Huang, Mingchen Li
Summary: The effect of increasing preheating temperature on the activation and aging of RAP binder was investigated, and an appropriate preheating temperature was determined. The results showed that increasing preheating temperature significantly improved binder activation, but also increased binder aging rate. It is recommended to use the activation-aging index (IAA) as a reference for finding the optimal preheating temperature.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Construction & Building Technology
Bibhuti Bhushan Bhardwaj, Surender Singh
Summary: The failure mechanism of RAP concrete is influenced by various factors such as mineralogy of aggregates, rheology of asphalt binder, asphalt aging intensity, and characteristics of cement-mortar paste. Understanding the intermolecular interactions and interfacial bond strengths helps to enhance the potential of RAP for concrete composites.
CEMENT & CONCRETE COMPOSITES
(2024)
Article
Chemistry, Multidisciplinary
Orlando Lima, Catia Afonso, Iran Rocha Segundo, Salmon Landi, Natalia C. Homem, Elisabete Freitas, Amanda Alcantara, Veronica Castelo Branco, Sandra Soares, Jorge Soares, Vasco Teixeira, Joaquim Carneiro
Summary: This study investigated the effects of nano-TiO2 on the aging of asphalt binder by modifying a commercial binder. The results showed that incorporating 0.25% nano-TiO2 effectively mitigated binder aging.
Article
Green & Sustainable Science & Technology
Zifeng Zhao, Feipeng Xiao, Emanuele Toraldo, Maurizio Crispino, Misagh Ketabdari
Summary: This study compares the viscoelastic improvement effect of crumb rubber and reclaimed asphalt pavement on asphalt mixtures. Laboratory tests showed that both crumb rubber and reclaimed asphalt pavement have a positive effect on the elasticity of the asphalt mixture. The elasticity improvement is mainly determined by the reclaimed asphalt pavement, but it also depends on the aged binder content. The effect of incorporating crumb rubber and reclaimed asphalt pavement together is comparable to the sum of the effect when incorporating each of them solely.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Green & Sustainable Science & Technology
Douglas Martins Mocelin, Mayzan Maher Isied, Cassie Castorena
Summary: This study uses a new mixture design method, called AAMD, to evaluate the impact of recycled binder availability (RBA) on the volumetric properties of asphalt mixtures. The results show that assuming a reasonable RBA is crucial, especially for mixtures containing 15% RAP and/or 4% RAS.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Engineering, Chemical
Ahmed S. Mohamed, Feipeng Xiao, Chamod Hettiarachchi, Talaat Abdel-Wahed
Summary: Reclaimed asphalt modified by crumb rubber-modified binder showed good bond strength in dry condition, and increasing the content of reclaimed asphalt can improve bond strength.
JOURNAL OF ADHESION
(2023)
Article
Chemistry, Physical
Bangwei Wu, Chufan Luo, Zhaohui Pei, Chuangchuang Chen, Ji Xia, Peng Xiao
Summary: Polymer additives have been widely used, but their effects on the durability of asphalt binders have not been thoroughly investigated. Adding polymer modifiers to SBS asphalt binders improves aging resistance, with high viscosity modifier (HVM) showing the best results. Various aging indicators can predict the aging degree of polymer modified asphalt binders.
Article
Construction & Building Technology
Ahmed S. Mohamed, Weili Wang, Hui Weng, Yonggang Fang, Feipeng Xiao
Summary: Using crumb rubber modified binder to rejuvenate reclaimed asphalt pavement is a sustainable pavement technology that recycles waste. It can enhance the rheological and mechanical characteristics of asphalt binder and mixture. The performance depends on the material type and modifier dosage. Understanding the binder colloid and its interaction with aggregate is important for this technology.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Jing Xu, Hui Chen, Yong Wen, Bin Xue, Rui Li, Jianzhong Pei
Summary: This study found that adding recycling oils may impair the durability of asphalt binders with reclaimed asphalt materials, but have little effect on the chemical reaction (oxidation). There is a good correlation between rheological and chemical changes, but it is also influenced by the material dependency.
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2021)
Article
Construction & Building Technology
Ramon Botella, Davide Lo Presti, Kamilla Vasconcelos, Kinga Bernatowicz, Adriana H. Martinez, Rodrigo Miro, Luciano Specht, Edith Arambula Mercado, Gustavo Menegusso Pires, Emiliano Pasquini, Chibuike Ogbo, Francesco Preti, Marco Pasetto, Ana Jimenez del Barco Carrion, Antonio Roberto, Marko Oreskovic, Kranthi K. Kuna, Gurunath Guduru, Amy Epps Martin, Alan Carter, Gaspare Giancontieri, Ahmed Abed, Eshan Dave, Gabrielle Tebaldi
Summary: This paper describes the development of a novel computational framework that accurately predicts the degree of binder activity in a reclaimed asphalt pavement sample. Different machine learning techniques were applied to obtain precise data representation models.
MATERIALS AND STRUCTURES
(2022)
Article
Construction & Building Technology
Waqas Rafiq, Madzlan Napiah, Noor Zainab Habib, Muslich Hartadi Sutanto, Wesam Salah Alaloul, Muhammad Imran Khan, Muhammad Ali Musarat, Abdul Muhaimin Memon
Summary: This study examines the influence of using crude palm oil in hot mix asphalt with recycled asphalt pavement materials. Experimental results show that stability and indirect tensile strength increase with up to 80% recycled asphalt pavement material, but 100% RAP with crude palm oil reduces these strength parameters. Microstructural analysis reveals that the incorporation of CPO changes the structure of aged and virgin binder, forming new and unique phases. The statistical models are significant and well-fitted, validated through experiments with a low error rate, indicating potential for CPO as a bio binder material.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Ahmed S. Mohamed, Sherif El-Badawy, Feipeng Xiao
Summary: Rejuvenating reclaimed asphalt binder using crumb rubber-modified binder is a sustainable paving technology that utilizes waste materials. This study investigated the aging potential of the binder and its impact on bond strength. Results showed that aging and addition of reclaimed binder improved bonding strength but limited the bonding enhancement after aging.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2023)
Article
Construction & Building Technology
Teng Wang, Wei Jiang, Chong Ruan, Jingjing Xiao, Dongdong Yuan, Wangjie Wu, Chengwei Xing
Summary: This study aims to investigate the rheological properties of high-viscosity modified reclaimed asphalt binder (HVRA) for recycled permeable asphalt concrete. The results show that HVRA exhibits excellent properties when the high-viscosity modifier (HVM) content is 18% and 20%. The rheological properties and fatigue resistance of HVRA decrease with the addition of reclaimed asphalt (RA). The optimal HVM content in HVA is 18%-20%, and the optimal RA content in HVRA is 10%-20% based on rheological properties.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Vivek Pratap Wagh, Mayank Sukhija, Ankit Gupta
Summary: Increased moisture susceptibility is a potential failure for warm-mix asphalt (WMA). Evaluating the bond strength between aggregate and asphalt binder is crucial to understanding the moisture damage mechanism. This study used the Pneumatic Adhesion Test (PAT) to assess the bond between various aggregates and warm mix (WM) modified asphalt binders. The results showed that the bonding relies on factors such as the aggregate type, base binder, and WM additives. The conditioning state (wet or dry) also affects the interfacial bonding.
CONSTRUCTION AND BUILDING MATERIALS
(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)