Article
Construction & Building Technology
Saloni, Parveen, Yee Yan Lim, Thong M. Pham, Jatin, Jatin Kumar
Summary: This study demonstrates that waste marble aggregates can effectively replace natural aggregates to produce sustainable alkali activated concrete, enhancing the strength and durability of the concrete, saving energy and costs, and reducing environmental impacts.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Chenchen Luan, Xiaoshuang Shi, Kuanyu Zhang, Nodir Utashev, Fuhua Yang, Jinxin Dai, Qingyuan Wang
Summary: This study proposed a new mix design method for geopolymer concrete, specifically low calcium fly ash geopolymer concrete, which allows for achieving high strength and excellent workability simultaneously. The workability is mainly influenced by the water content, while strength is affected by the water to alkaline activator ratio.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Timothy A. Aiken, Jacek Kwasny, Wei Sha, Kien T. Tong
Summary: The study found that the resistance of alkali-activated concrete against chloride, freeze-thaw, and acid attack improves with increased slag content and activator, but it is not as good as Portland cement concrete in terms of chloride and freeze-thaw resistance. Acid resistance appears to be a more promising characteristic of alkali-activated concrete compared to Portland cement concrete.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Beibei Sun, Yubo Sun, Guang Ye, Geert De Schutter
Summary: In this study, the influence of control factors on the workability and compressive strength of BFS/FA-AAC was investigated, and a practical mix design method was established. The results showed that the mixture composition and water content significantly affect the workability of BFS/FA-AAC, while the compressive strength is determined by control factors. The accuracy of an empirical compressive strength formula for predicting BFS/FA-AAC performance was validated. This research is important for promoting the application of BFS/FA-AAC.
CEMENT & CONCRETE COMPOSITES
(2023)
Article
Construction & Building Technology
Banoth Gopalakrishna, Pasla Dinakar
Summary: Concrete is widely used as a building material and can accommodate large volumes of industrial waste by-products. The use of recycled aggregate geopolymer concrete is a cost-effective way to dispose of debris. However, the lack of appropriate mix design methodology limits its use as structural concrete. This study aims to develop a new mix design methodology using fly ash, ground granulated blast furnace slag, and 100% recycled aggregate to improve its performance.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Chemistry, Multidisciplinary
C. Righi, I Lancellotti, L. Barbieri, G. M. Kirkelund
Summary: Municipal solid waste incineration fly ash (MSWI FA) contains hazardous heavy metals and soluble salts. This research investigated the use of electrodialytic treatment as a pre-treatment for MSWI FA, and its impact on metakaolin-based geopolymer as an encapsulation matrix. The results showed that geopolymer effectively encapsulated heavy metals, and electrodialytic pre-treatment improved the environmental and mechanical characteristics of the geopolymer.
SUSTAINABLE CHEMISTRY AND PHARMACY
(2022)
Article
Polymer Science
Chamila Gunasekara, Peter Atzarakis, Weena Lokuge, David W. Law, Sujeeva Setunge
Summary: Despite extensive research into high calcium fly ash geopolymer concretes, no universally applicable method to determine mix proportions has been developed. This study uses an artificial neural network and statistical regression model to predict mix designs for high calcium fly ash geopolymer concrete and provide insights into predicting tensile strength and elastic modulus based on the relationship between key parameters and compressive strength.
Article
Construction & Building Technology
Xiaonan Ge, Yiwei Liu, Yuguang Mao, Xiang Hu, Caijun Shi
Summary: This study investigates the long-term mechanical properties of pure Class F fly ash-based geopolymer concrete (FGPC) pavement under field conditions, focusing on the microstructure and chemical compositions of reaction products. The results show that the compressive strength of FGPC continuously increases over time, reaching 47.29 MPa at 28 days and 65.54 MPa at 4 years. Various techniques, such as scanning electron microscopy (SEM), nuclear magnetic resonance (NMR), and capillary absorption tests, were used to study the physical microstructure changes, while X-ray diffraction (XRD), energy-disperse spectroscopy (EDS), and pH tests were used for chemical composition analysis. The long-term curing resulted in a homogeneous and compact microstructure with low average porosity and secondary absorption rate. The chemical composition changes indicate the transformation of the disordered geopolymer into a more ordered structure. The strong correlations found between mechanical properties and micro-characteristics provide guidance for adjusting the mechanical properties of FGPC.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
M. Talha Ghafoor, Qasim S. Khan, Asad U. Qazi, M. Neaz Sheikh, M. N. S. Hadi
Summary: This study investigates the influence of alkaline activators on the mechanical properties of cement-free geopolymer concrete cured at ambient temperatures, with varying parameters leading to optimized compressive and flexural strengths.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Vahab Toufigh, Alireza Jafari
Summary: Geopolymer concrete is an eco-friendly alternative to traditional concrete, but the lack of standard mix design is a major obstacle to its use in the construction industry. This study proposes a comprehensive model for predicting the compressive strength of fly ash-based geopolymer concrete, highlighting the importance of chemical compositions on the strength. The model can estimate the compressive strength of low calcium FAGC with acceptable accuracy, saving time and money in practical applications.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Wanli Wang, Chengcheng Fan, Baomin Wang, Xiong Zhang, Ze Liu
Summary: The study investigates the effects of alkali admixture (A/F), activator modulus (Ms), and water-binder ratio (w/b) on the performance of fresh and hardened fly ash geopolymers (FAGs) through rheological, strength, and microstructural tests. The rheological behavior of the FAG paste conforms to the H-B model, and by adjusting the parameters, the properties of the FAG paste can be effectively improved while maintaining strength.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Materials Science, Ceramics
Amiya P. Goswami
Summary: The study found that the CaO/SiO2 ratio in the composition of alkali-activated fly ash/GGBS cements significantly influences their properties. Different strengths were obtained using mono-component original fine, medium, and coarse sized fly ashes. In bi-component fly ash and GGBS based alkali-activated cements, the strength decreases with increasing Al/(Na + K) ratio.
CERAMICS INTERNATIONAL
(2021)
Article
Construction & Building Technology
K. M. Klima, K. Schollbach, H. J. H. Brouwers, Qingliang Yu
Summary: The addition of synthetic sodalite phase to Class F fly ash-based geopolymers significantly enhances high-temperature performance by inducing phase formation and reducing thermal shrinkage. The sodalite phases also lower the glass transition temperature and act as a skeletal reinforcement in the material.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Prinya Chindaprasirt, Peerapong Jitsangiam, Wichian Chalee, Ubolluk Rattanasak
Summary: Coal-fired power plants produce pollutants and acid wastewater that require treatment before release to the environment. This study suggests using pervious geopolymer concrete to neutralize acidic wastewater and improve physical properties, suitable for wastewater infiltration and neutralization.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2021)
Article
Construction & Building Technology
Athika Wongkvanklom, Patcharapol Posi, Apichit Kampala, Traitot Kaewngao, Prinya Chindaprasirt
Summary: This study demonstrates that using recycled asphaltic concrete aggregate (RACA) can improve the surface abrasion and sulfuric acid resistances of high calcium fly ash geopolymer concrete (HFGC), while reducing the thermal conductivity.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2021)
Article
Construction & Building Technology
M. Li, A. Khennane, B. Brandelet, M. El Ganaoui, M. Khelifa, Y. Rogaume
CONSTRUCTION AND BUILDING MATERIALS
(2018)
Article
Mechanics
Zongjun Li, Amar Khennane, Paul J. Hazell, Alex M. Remennikov
COMPOSITE STRUCTURES
(2018)
Article
Mechanics
M. Li, M. Khelifa, A. Khennane, M. El Ganaoui
COMPOSITE STRUCTURES
(2019)
Article
Construction & Building Technology
Biruk Hailu Tekle, Amar Khennane
MAGAZINE OF CONCRETE RESEARCH
(2020)
Article
Engineering, Civil
S. Illouli, A. Sadaoui, A. Khennane
ENGINEERING STRUCTURES
(2019)
Article
Engineering, Geological
Shivang Pathak, Amar Khennane, Safat Al-Deen
BULLETIN OF EARTHQUAKE ENGINEERING
(2020)
Article
Engineering, Geological
Shivang Pathak, Simon Watt, Amar Khennane, Safat Al-Deen
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2020)
Article
Engineering, Civil
Shivang Pathak, Amar Khennane, Simon Watt, Safat Al-Deen
Article
Construction & Building Technology
Zongjun Li, Ali A. H. Ameri, Paul J. Hazell, Amar Khennane, Juan P. Escobedo-Diaz, Binod Aryal, Hongxu Wang
Summary: This study investigated the impact response of GFRP pultruded profiles under low-velocity impact loading, finding that the extent of impact-induced damage increased with ascending impact energies until perforation occurred. The initial impact energy was identified as the dominant parameter controlling the damage tolerance characteristics of pultruded composites.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
T. T. Tran, A. Khennane, M. Khelifa, P. Girods, M. Oudjene, Y. Rogaume
Summary: This study presents a three-dimensional finite element model to accurately simulate the thermomechanical transfers taking place within flax chipboards under fire conditions. By considering the thermal degradation during the pyrolysis phase and the evolution of the physicomechanical properties as functions of temperature, the model provides good agreements with measured values.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2022)
Article
Construction & Building Technology
Firesenay Zerabruk Gigar, Amar Khennane, Jong-leng Liow, Biruk Hailu Tekle, Elmira Katoozi
Summary: This study reports on the encouraging results of an experimental program using waste wood to produce cement bonded wood composites, which could be used as a building material. The use of decontaminated wood chips significantly improves the strength of the composites compared to non-decontaminated wood chips.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Proceedings Paper
Engineering, Civil
Zongjun Li, Amar Khennane, Hongxu Wang, Paul J. Hazell, Juan Pablo Escobedo-Diaz
Summary: An experimental program was conducted to investigate the impact response of pultruded composites under low-velocity impact loading. The results showed that the extent of damage varied with the change of impactor sharpness, while the impact performance improved with the increase of impactor flatness.
10TH INTERNATIONAL CONFERENCE ON FRP COMPOSITES IN CIVIL ENGINEERING (CICE 2020/2021)
(2022)
Article
Engineering, Civil
Biruk Hailu Tekle, Yifei Cui, Amar Khennane
STRUCTURAL ENGINEERING AND MECHANICS
(2020)
Proceedings Paper
Engineering, Civil
Z. Li, H. Wang, B. Aryal, P. J. Hazell, A. Khennane, K. Shankar, J. P. Escobedo-Diaz
ADVANCES IN ENGINEERING MATERIALS, STRUCTURES AND SYSTEMS: INNOVATIONS, MECHANICS AND APPLICATIONS
(2019)
Article
Construction & Building Technology
Salah Altoubat, M. Talha Junaid, Moussa Leblouba, Deena Badran
CEMENT & CONCRETE COMPOSITES
(2017)
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)
