Article
Construction & Building Technology
Yiming Li, Haibo Ding, Yihua Nie, Simon A. M. Hesp
Summary: The study found significant variability among asphalt binders of ostensibly the same AASHTO M 320 grade, with CTOD values affecting the materials' cold temperature resistance and EBBR LLTG highly correlated with the T(delta = 30 degrees) grade. The results suggest that two limiting phase angle temperatures can be utilized for a more precise, accurate, and practical specification protocol for controlling cold temperature cracking in the future.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Yun Su Kim, Johannes Buechner, Michael P. Wistuba, Jose Rodriguez Agudo, Mrinali Rochlani, Michael Schaeffler
Summary: A novel Three-Point Bending Beam Test (3-PBT) using a Dynamic Shear Rheometer (DSR) is introduced for testing asphalt binder at low temperature conditions. Compared to the traditional Bending Beam Rheometer (BBR) tests, the 3-PBT in DSR has several advantages, including the elimination of harmful cooling medium, lower amount of asphalt binder required, easier specimen preparation with silicone rubber mold, and a more practical loading protocol. The precision of the 3-PBT in DSR is found to be satisfying, and the results correlate well with the BBR tests.
FRONTIERS IN MATERIALS
(2022)
Article
Construction & Building Technology
Yiming Li, Simon A. M. Hesp
Summary: Recent paving contracts in Ontario have specified asphalt binders based on various criteria, including crack tip opening displacements, low temperature performance grades, and grade losses. However, the testing protocols for these criteria are cumbersome. A study was conducted to assess the feasibility of using phase angle temperatures as an alternative to CTOD, LLTPG, and grade losses. The results showed a strong correlation between phase angle and these performance measures, suggesting that a phase angle specification could be a more practical approach for controlling pavement cracking.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Yiming Li, Simon A. M. Hesp
Summary: In recent years, Ontario's paving contracts have specified higher standards for asphalt binders, including requirements for CTOD, LLTPG values, in hopes of improving pavement performance. The study found that phase angle can replace CTOD, EBBR LLTPG, and grade losses, with significant variations for softer grades, warranting further consideration of phase angle specifications.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
N. Amirjani, N. Barka, M. Eskandari, M. Hizombor
Summary: This study produced an API 5LX60 MS linepipe steel plate suitable for sour environments by implementing a specific casting procedure and thermo-mechanical controlled process route. The microstructure of the plate was observed using optical microscopy, and compared to the API 5LX60 M steel plate suitable for sweet environments. The results showed increased volume fraction of quasi-polygonal ferrite and decreased volume fraction and size of pearlite in the API 5LX60 MS steel plate.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Green & Sustainable Science & Technology
Dongzhao Jin, Jiaqing Wang, Lingyun You, Dongdong Ge, Chaochao Liu, Hongfu Liu, Zhanping You
Summary: The study found that adding CRT glass powder to asphalt can improve the activation energy and resistance to permanent deformation, while slightly increasing the fatigue life of the asphalt. The low-temperature cracking temperature initially decreases with the increase of CRT glass powder content and then increases as the CRT content increases further.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Construction & Building Technology
Mikaeil Naseri Yalghouzaghaj, Alireza Sarkar, Gholam Hossein Hamedi, Parham Hayati
Summary: The study investigated the impact of using UHMWPE on modified asphalt cement, showing that the additive can improve the performance of the modified asphalt cement at low temperatures. Thermodynamic tests indicated that the use of UHMWPE increased cohesion and adhesion free energies. Mechanical tests demonstrated that the addition of UHMWPE significantly enhanced the low-temperature properties of the modified asphalt mixture.
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2021)
Article
Construction & Building Technology
Abu Sufian Mohammad Asib, P. Romero
Summary: Evaluating the low-temperature performance of asphalt mixtures before application on pavements can significantly reduce costs and carbon footprint during cold seasons. By conducting eight years of experiments and using the Bending Beam Rheometer, a criterion for low-temperature performance was developed and successfully applied to different construction projects.
ROAD MATERIALS AND PAVEMENT DESIGN
(2022)
Article
Construction & Building Technology
Johannes Buechner, Michael P. Wistuba
Summary: In this article, creep properties of asphalt binders, asphalt mastics, and asphalt mixtures are tested and comparatively analyzed. The results show that the creep behavior of asphalt mixtures is significantly affected by the asphalt binder.
ROAD MATERIALS AND PAVEMENT DESIGN
(2022)
Article
Construction & Building Technology
Zhengda Wu, Dongdong Ge, Zihao Ju, Yanhua Xue
Summary: Limited research has been conducted on the influence of rubber on asphalt binder in dry process rubberized asphalt mixture. By utilizing an extraction procedure, the characteristics of the asphalt binder interacting with rubber could be assessed. The research aims to evaluate the properties of asphalt binder from dry process rubberized asphalt mixture accurately and determine the percentage of rubber in the mixture. Rheological performance, creep and recovery, and low temperature characteristics were evaluated for different asphalt binders using various tests. Rubber modification and aged binder from recycled asphalt pavement (RAP) improved the high temperature characteristics and deformation resistance of the asphalt binder. On the other hand, the aged RAP binder deteriorated the low temperature characteristics of the extracted asphalt binder. The coupling effect of aged binder and rubber addition enhanced the permanent deformation resistance of the asphalt binder. The interacted rubber percentage was estimated based on rutting parameter and percent recovery, showing a good correlation with the DSR and MSCR tests. The estimated percentages of interacted rubber in the two types of rubber modified mixtures are 61.9% and 57.4%, respectively.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Johannes Buechner, Dawid Rys, Stefan Trifunovic, Michael P. Wistuba
Summary: A novel relaxation test using a DSR is proposed to evaluate asphalt binder low temperature properties. Different rheometers from different manufacturers are used to analyze seven asphalt binders, and different material parameters are derived to evaluate and discriminate the binders. The test results of the three instruments are found to be identical. Results are compared to BBR testing and a linear correlation for the BBR characteristic m-value is identified.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Haoyuan Luo, Rongyan Tian, Yangzezhi Zheng, Dalin Wang, Siyu Chen, Xiaoming Huang
Summary: A new method called the notched specimen cracking test (NSCT) is presented to directly measure the thermal stress and critical temperature of asphalt binders at low temperatures. The NSCT method is reliable and easy to operate, with thermal stress results showing at least 50% smaller coefficient of variation compared to traditional methods.
INTERNATIONAL JOURNAL OF PAVEMENT ENGINEERING
(2022)
Review
Chemistry, Multidisciplinary
Yiqing Dai, Wei Liang, Danwang Ye, Shengjia Xie, Yuan Sang, Dong Li
Summary: Nanosilica (NS) has been widely used as an additive in asphalt modification to improve its performance. However, there are concerns about the reproducibility of the results due to the variability of asphalt materials. High-purity NS additives with a large specific surface area have been found to be effective in enhancing the rutting resistance of asphalt mixtures. Inconsistency in blending procedures, such as shear speed, blending duration, and temperature, can lead to excessive blending and unnecessary energy and time consumption. Increasing the concentration of NS can affect the physical properties of asphalt, resulting in improved high-temperature performance but potentially deteriorated low-temperature performance.
NANOTECHNOLOGY REVIEWS
(2023)
Article
Construction & Building Technology
Jamilla Emi Sudo Lutif Teixeira, Carlos Martins Amaecing Junior, Lilian Ribeiro de Rezende, Veronica Teixeira Franco Castelo Branco, Yong-Rak Kim
Summary: Fatigue cracking in asphalt concrete (AC) is a major issue in flexible pavements. Current fatigue tests are time-consuming and expensive, and static tests are recommended in mix-design specifications for their simplicity. This study aims to develop a cyclic SCB fatigue testing method for AC performance evaluation. The results from the cyclic SCB tests were compared to those from indirect tensile (IDT) fatigue tests, showing good repeatability and similarity in the results.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Di Wang, Augusto Cannone Falchetto, Chiara Riccardi, Jan Westerhoff, Michael P. Wistuba
Summary: This paper experimentally investigates and models the impact of physical hardening and aging temperatures on the low temperature rheological properties of asphalt binders. The results indicate that physical hardening causes a significant increase in complex shear modulus and creep stiffness, which diminishes as conditioning time is extended. Linear correlations are observed between results from different conditioning times, and reducing aging temperatures can mitigate the effect of physical hardening.
ROAD MATERIALS AND PAVEMENT DESIGN
(2021)
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)