Article
Construction & Building Technology
Yongchun Cheng, Haitao Wang, Wensheng Wang, Jiaxiang Liang
Summary: To understand the impact of freeze-thaw cycles on asphalt pavements, various tests were conducted to evaluate the rheological properties of asphalt binder and mastic, study the asphalt binder-filler interaction, and analyze the changes in chemical composition. The results showed that freeze-thaw cycles led to increased recovery of asphalt binder, decreased non-recoverable creep compliance, and increased rutting and fatigue factors. Furthermore, the fatigue resistance of asphalt mastic was found to be poorer than that of asphalt binder. The low-temperature stiffness of both asphalt binder and mastic increased with more freeze-thaw cycles. The interaction between asphalt binder and filler was seriously damaged after fifteen freeze-thaw cycles. This study provides useful insights for the design and construction of asphalt pavements in seasonal frozen regions.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Yu Chen, Runjie Gao, Hainian Wang, Wenhua Zheng, Zhanping You
Summary: The study demonstrates that, while high modulus asphalt concrete (HMAC) has significantly higher rutting resistance, its low cracking resistance due to low ductility and stress dissipation at the crack tip should be a concern when subjected to tensile loading in application.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Wenhui Zhao, Jiuguang Geng, Mingyuan Chen, Xu Li, Yanhui Niu
Summary: The content of SBS modifier in SBS modified asphalt greatly affects its physical and chemical characteristics, but determining the SBS content after aging is still a challenge. In this study, FTIR and potentiometric titration tests were used to detect the SBS content of aged binders, and it was found that these tests can effectively predict the SBS content and analyze the aging degree of SBS modified asphalt.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Ke Shi, Zhen Fu, Feng Ma, Jun Liu, Ruimeng Song, Jiarong Li, Jiasheng Dai, Chen Li, Yalu Wen
Summary: This study aimed to improve the recycling efficiency of waste SBS-modified asphalt and evaluate its physical properties and thermal stability. The types and contents of rejuvenators have different effects on the performance of rejuvenated asphalt.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2022)
Article
Construction & Building Technology
Xiaofei Zhao, Minhaz Ur Rahman, Tharanga Dissanayaka, Farhad Gharagheizi, Carla Lacerda, Sanjaya Senadheera, Ronald C. Hedden, Gordon F. Christopher
Summary: The study investigates the effect of adding PP/PE copolymer modified asphalt binder on the ability to resist rutting in high temperatures. Results show that the PP/PE copolymer can significantly increase the rutting factor of asphalt binder within a specific temperature range, effectively reducing the risk of pavement rutting.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2021)
Article
Chemistry, Physical
Abdulrahman Hamid, Hassan Baaj, Mohab El-Hakim
Summary: Using geopolymer as a modifier for asphalt binders and mixtures has gained attention in recent decades. This study aimed to investigate the effect of geopolymer (GF) and styrene-butadiene-styrene (SBS) modifiers, as well as their combination, on the rheological properties and performance of asphalt binders. The findings showed that the additives reduced the temperature sensitivity of the binders and improved their fatigue resistance and tensile strength. The modified asphalt mixtures also exhibited enhanced resistance to cracking in dry and freeze-thaw conditions.
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
Hongjie Hao, Zhihui Chen, Peiliang Cong, Zhiyu Han
Summary: The waste polyurethane (WPU) particles are used to modify asphalt binder in order to obtain modified asphalt binders with excellent properties. The addition of WPU particles improves the low temperature crack resistance of the base asphalt binder but impairs the property of SBS modified asphalt binder. The thermal storage stability of the WPU particles modified asphalt binder is poor but can be improved by using SBS. The rod-shaped WPU particles enhance the rutting resistance of the asphalt binder, however, their structure is destroyed during aging process.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Xiaolong Yang, Guiyong Liu, Hongliu Rong, Yongjun Meng, Chunhong Peng, Minqiang Pan, Zhikang Ning, Guangchen Wang
Summary: The mechanical properties of composite modified asphalt and the interaction mechanism of each modifier were investigated. The results showed that PPA and BA can improve the storage stability of SBS modified asphalt, and the composite modified asphalt with lower SBS content still has excellent performance.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Ben Du, Rui Li, Fucheng Guo, Runchi Cai, Jianzhong Pei
Summary: In this study, a new regenerant was prepared using waste edible oil, SBS modifier, plasticizer, and antiaging agent to achieve the effect of regeneration of aged SBS modified asphalt binder. Various tests were conducted to study the effects of the regenerant on the rheological and microscopic properties of the aged asphalt binder. The results showed that the B-type regenerant had the best recovery effect on the aged asphalt binder.
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2023)
Article
Construction & Building Technology
Danial Nasr, Rezvan Babagoli, Mojtaba Mazrouei
Summary: This study evaluates the performance of modified binders by using polyethylene wax and crumb rubber. Results show that the addition of a certain amount of crumb rubber and polyethylene wax can improve the energy-saving and air pollution reduction properties of the binder. However, the addition of polyethylene wax decreases the performance of the binder at low temperatures, while the addition of crumb rubber enhances the performance.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Yujie Tang, Zhen Fu, Feng Ma, Jun Liu, Qiyu Sun, Chen Li
Summary: This study investigated the effects of CNTs on the high-temperature rheological and chemical properties of SBS modified asphalt. Molecular dynamics simulation, DSR, BBR, and FTIR spectrometer were used to assess the molecular motion state, rheological properties, and chemical properties of CNTs and SBS composite modified asphalt binders under various aging conditions. The findings demonstrated that CNTs could absorb components in SBS-modified asphalt, restrict the movement and diffusion of SBS and asphalt molecules, and improve the stability of SBS-modified asphalt. Additionally, the addition of CNTs could enhance the rheological properties, temperature susceptibility, and rutting resistance of SBS-modified asphalt at high temperatures.
INTERNATIONAL JOURNAL OF PAVEMENT ENGINEERING
(2023)
Article
Construction & Building Technology
Didier Lesueur, Michael D. Elwardany, Jean-Pascal Planche, Don Christensen, Gayle N. King
Summary: This paper examines the addition of a new criterion, Delta Tc, to the current Performance Grading system for asphalt binders in the USA, discussing its relationship with other binder rheological properties and highlighting the relevant parameters controlling Delta Tc. Experimental data confirm that Delta Tc is of pure rheological origin.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Alireza Sadat Hosseini, Pouria Hajikarimi, Mostafa Gandomi, Fereidoon Moghadas Nejad, Amir H. Gandomi
Summary: This study aimed to develop prediction models for the complex shear modulus (G*) and phase angle (θ) of rubber-modified bitumens, using a robust genetic programming method. The developed models were found to accurately calculate G* and θ at different temperatures and loading frequencies, with the modifier dosage being the most influential input variable. The study also demonstrated the linear behavior of G* and θ of the original bitumen in reflecting the effect of temperature and loading frequency on the viscoelastic behavior of the modified bitumen.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Polymer Science
Abdulrahman Hamid, Hassan Baaj, Mohab El-Hakim
Summary: Modifying asphalt binders is an effective method to improve the performance of asphalt pavement, and this study evaluated the effects of temperature, stresses, polymer type, and modification rate on the rutting behavior of modified asphalt binders. Through laboratory testing, the rheological properties of the binders and the rutting resistance of asphalt mixtures were investigated. The findings provide insights into the best modifiers and mixtures for different temperature conditions.
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)