Article
Green & Sustainable Science & Technology
Shan Liu, Yifei Hao, Guowei Ma
Summary: The study aims to enhance the carbonation resistance of fly ash and slag based alkali-activated mortar by adding different additives. Test results showed that adding calcined hydrotalcite is the most effective measure in improving carbonation resistance and compressive strength.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Engineering, Civil
Sarah Fernando, Chamila Gunasekara, David W. Law, M. C. M. Nasvi, Sujeeva Setunge, Ranjith Dissanayake, M. G. M. U. Ismail
Summary: This study explored the use of rice husk ash as a precursor material for alkali-activated binders, finding that replacing fly ash with 10% and 20% RHA resulted in decreases of approximately 14% and 43% in compressive strength. The higher specific surface area and unburnt carbon content in RHA were identified as key factors affecting the lower compressive strength obtained. Additionally, the addition of RHA increased the reactive silica in the gel matrix, leading to a negative impact on compressive strength.
ARCHIVES OF CIVIL AND MECHANICAL ENGINEERING
(2021)
Article
Construction & Building Technology
Jincheng Li, Zhigao Sun, Lei Wang, Xingchun Yang, Dongliang Zhang, Xiaowei Zhang, Mitang Wang
Summary: This study prepared HMNS-FA-phosphate based geopolymers by using phosphoric acid as activator and investigated the effects of phosphoric acid amount, HMNS:FA ratio, and water-binder ratio on the mechanical properties. The optimal conditions were found to be phosphoric acid amount of 25%, HMNS:FA ratio of 0.7:0.3, and water-binder ratio of 0.24.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Fuyang Zhang, Xiao Yao, Tao Yang, Xuan Gao, Chenzi Geng, Tao Jiang
Summary: This study investigated the effect of FAM on AAS mortars for the first time, showing that FAM addition can decrease viscosity, increase fluidity, and effectively reduce ASR expansion. FAM promotes better alkali binding capacity to mitigate ASR in AAS mortars, while consuming Ca(OH)2 in OPC mortars to influence ASR development. Minor ASR products were observed in both AAS and OPC mortars modified with FAM, with stronger bonding between aggregate-paste interfaces.
MATERIALS RESEARCH EXPRESS
(2021)
Article
Construction & Building Technology
Hilal El-Hassan, Ehab Shehab, Abdelrahman Al-Sallamin
Summary: The study found that the optimal curing regime for alkali-activated blended concrete made with 0% and 25% fly ash was a combination of water and subsequent air curing, while that for mixes made with 50% fly ash was continuous water curing. The mix incorporating 25% fly ash exhibited superior properties compared to other mixtures.
JOURNAL OF SUSTAINABLE CEMENT-BASED MATERIALS
(2021)
Article
Construction & Building Technology
Saif Al-Shmaisani, Ryan D. Kalina, Raissa Douglas Ferron, Maria C. G. Juenger
Summary: The availability of traditional siliceous Class F fly ash is decreasing as countries switch to renewable energy sources. To extend the availability of siliceous fly ash, suppliers are distributing blended coal ashes and incorporating other coal combustion products (CCPs) or natural pozzolans. While the characteristics of these blended fly ashes may differ, they perform well in cement-based mixtures.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Review
Polymer Science
Osama A. A. Mohamed
Summary: Reductions of green gas emissions and the reuse/recycling of industrial byproducts are crucial in mitigating the environmental impact of construction. This critical review focuses on the effect of key parameters on the compressive strength development of concrete or mortar using alkali-activated ground granulated blast furnace slag (GBS) and fly ash as binders. It also examines the impact of exposure and sample age on concrete strength development in acidic media.
Article
Environmental Sciences
Keyu Chen, Dazhi Wu, Sijia Fei, Chonggen Pan, Xinyuan Shen, Chaoxia Zhang, Juntao Hu
Summary: Traditional cementitious products are prone to deterioration when exposed to acid solutions, while alkali-activated materials offer a more durable and environmentally friendly alternative. The addition of ordinary Portland cement into alkali-activated systems can significantly increase compressive strength but may compromise durability after acid attack.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Construction & Building Technology
Kala Kondepudi, Kolluru V. L. Subramaniam
Summary: The study focuses on enhancing the buildability of printable alkali-activated mixtures by modifying the baseline mixture with alkaline activating solution and components like CMC, influencing the viscosity and properties of the mixture for achieving constructability in 3D concrete printing.
CEMENT & CONCRETE COMPOSITES
(2021)
Article
Construction & Building Technology
Adeolu Adediran, Juho Yliniemi, Patrick N. Lemougna, Priyadharshini Perumal, Mirja Illikainen
Summary: The use of waste-based reactive co-binders improves the properties of alkali-activated materials, making them suitable for construction applications.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Construction & Building Technology
Jian Zhang, Caijun Shi, Zuhua Zhang, Xiang Hu
Summary: This study elucidated the effects of slag/fly ash ratios, Na2O concentration, and silicate modulus on the reaction mechanism of sulfate attack on alkali-activated slag/fly ash cements using XRD, FTIR, and TG/DTG analysis. The results showed that MgSO4 attack on AACs was severe due to alkali dissolution and Mg2+ intrusion, whereas Na2SO4 attack did not significantly alter the C-A-S-H gel structures of AACs. Additionally, the resistance of NaOH-activated slag to MgSO4 was higher compared to Na2SiO3-activated slag, but this trend reversed with an 80% fly ash replacement level.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Green & Sustainable Science & Technology
Kantiya Sothornchaiwit, Warayut Dokduea, Weerachart Tangchirapat, Suraparb Keawsawasvong, Chanachai Thongchom, Chai Jaturapitakkul
Summary: This study investigated the effects of silica fume addition and curing temperature on the compressive strength and durability of alkali-activated mortars. It was found that the optimal content of silica fume was 6%, which provided a compressive strength as high as that of mortars cured at 45 degrees C. The alkali-activated mortars performed better in terms of acid and sulfate resistance compared to ordinary Portland cement mortars.
Article
Chemistry, Physical
Haozhe Guo, Baifa Zhang, Liangliang Deng, Peng Yuan, Mengyuan Li, Qiang Wang
Summary: This study synthesized SAP geopolymers using FA and found that increasing FA content shortened setting time but decreased compressive strength. High FA proportion led to lack of active aluminum, formation of ACP, and ultimately decreased compressive strength.
APPLIED CLAY SCIENCE
(2021)
Article
Construction & Building Technology
Zhenming Li, Xuhui Liang, Yun Chen, Guang Ye
Summary: The addition of metakaolin can significantly reduce the autogenous shrinkage of alkali-activated slag-fly ash paste, lower the compressive and flexural strength of the paste.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Green & Sustainable Science & Technology
Slobodan Supic, Vesna Bulatovic, Mirjana Malesev, Vlastimir Radonjanin, Ivan Lukic
Summary: This study analyzes the effects of replacing cement with locally sourced waste materials in Serbia, such as fly ash, blast furnace granulated slag, and wheat straw ash. By using these alternative materials, it is possible to maintain performance and improve the economic and environmental impacts of masonry mortar production.
Article
Computer Science, Interdisciplinary Applications
Enhao Zhang, Saeed Miramini, Minoo Patel, Martin Richardson, Peter Ebeling, Lihai Zhang
Summary: Mechanical stability is crucial for fracture healing process as excessive interfragmentary movement may lead to persistent and enhanced inflammatory response. The impact of mechanical instability on inflammation in diabetic condition is relatively limited. This study presents a numerical model to investigate the role of mechanical stability in inflammatory response during early stage of healing.
COMPUTER METHODS AND PROGRAMS IN BIOMEDICINE
(2023)
Article
Engineering, Civil
Bingcheng Guo, Xiaoshan Lin, Yufei Wu, Lihai Zhang
Summary: This study proposes an integrated model based on machine learning method to evaluate the moment capacity and ductility of FRP-reinforced concrete beams with CY blocks and T sections. By testing different activation functions and kernel functions, the prediction accuracy of the model is improved. The optimal CY beam section design solutions are identified using a genetic algorithm.
ENGINEERING STRUCTURES
(2023)
Article
Engineering, Multidisciplinary
Xuemei Liu, Xiangyu Xie, Lihai Zhang, Nelson Lam
Summary: A numerical model based on Jeffery's equation was developed to investigate the effects of concrete flow on fiber orientation in SCFRC. The model showed higher computational efficiency compared to particle-based methods. Casting parameters such as casting method, formwork size, and casting velocity were found to significantly influence fiber orientation, with fibers aligning parallel in the middle section and sticking up at the end of the formwork. The results also emphasized the importance of choosing the casting speed carefully for optimal fiber alignment.
INTERNATIONAL JOURNAL OF COMPUTATIONAL METHODS
(2023)
Article
Computer Science, Interdisciplinary Applications
Xuanchi Liu, Saeed Miramini, Minoo Patel, Peter Ebeling, Jinjing Liao, Lihai Zhang
Summary: This study aimed to develop optimal machine learning algorithms for designing effective physiotherapy programs for distal radius fractures at different healing stages. A three-dimensional computational model was developed, which integrated mechano-regulated cell differentiation, tissue formation, and angiogenesis. The model could predict healing outcomes based on physiologically relevant conditions. The results showed that different machine learning algorithms performed best at different healing stages.
COMPUTER METHODS AND PROGRAMS IN BIOMEDICINE
(2023)
Article
Computer Science, Interdisciplinary Applications
Qin Li, Saeed Miramini, David W. Smith, Bruce S. Gardiner, Lihai Zhang
Summary: This study aims to develop a numerical model to investigate the effects of osteochondral junction leakage on cartilage lubrication. The results show that the permeability of the junction has a significant impact on cartilage lubrication, especially in the early stage of the disease. Increased leakage leads to a decrease in lubrication duration, shorter consolidation time, and an increase in the initial friction coefficient. These findings contribute to a better understanding of the development mechanism of cartilage disorders.
COMPUTER METHODS AND PROGRAMS IN BIOMEDICINE
(2023)
Article
Construction & Building Technology
Rui Zhou, Wenhao Yuan, Weibin Liu, Xuan Zhu, Guowen Yao, Feng Li, Lihai Zhang
Summary: The thermal deformation of the CRTS II slab track under extreme ambient temperatures is investigated. The parameters of the bilinear cohesive zone models for the vertical interlayer and longitudinal slab interlayer are deduced and verified. Thermal responses of the track structure are calculated, and it is found that the heat transfer model effectively reflects the thermal performance under extreme temperatures. The internal temperatures and stresses rapidly change within two hours, and a noticeable mutation is observed under extreme high temperatures.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Engineering, Civil
Rui Zhou, Peng Lu, Xiaodong Gao, Yaojun Ge, Yongxin Yang, Lihai Zhang
Summary: The purpose of this paper is to study the effects of a moveable guide vane with various configurations in controlling the vortex-induced vibration (VIV) of a long-span suspension bridge with twin-box girder. VIV tests were conducted on a 1:50 scaled model with different guide vane configurations. The results show that the moveable guide vane can significantly reduce the maximum displacement responses of the main girder, especially under unfavorable wind attack angles. The stiffness and length of the guide vane also affect the VIV control, with lower stiffness and shorter length leading to better outcomes. The leeward guide vane plays an important role in VIV suppression when its stiffness exceeds a certain threshold.
ENGINEERING STRUCTURES
(2023)
Article
Thermodynamics
Jiangfeng Long, Ken Yang, Shunfeng Wang, Linglin Xu, Zhenghong Yang, Chenfeng Ye, Jingjing Luo, Kai Wu, Lihai Zhang
Summary: Quartzite stone powder (QP) is a byproduct that causes environmental problems, but it can be partially substituted for cement to create an environmentally friendly material. The fineness of the QP affects the strength development and hydration reaction. Fine QP (600 and 800 m(2) kg(-1)) accelerates cement hydration and improves pore structure. The addition of QP reduces cement usage, energy consumption, carbon emission, and cost.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2023)
Article
Engineering, Mechanical
Rui Zhou, Yaojun Ge, Yongxin Yang, Qingkuan Liu, Haijun Zhou, Lihai Zhang
Summary: This study investigates the effects of the combination of aspect ratios and a centralized stabilizer on the wind-induced stabilization of a long-span suspension bridge with closed-box girders. The results show that the nonlinear self-excited forces and critical wind speed increase with aspect ratio. Additionally, the application of a vertical stabilizer can change the flutter divergence patterns and improve aerostatic performance.
NONLINEAR DYNAMICS
(2023)
Article
Engineering, Geological
Chang Xia, Zhen Liu, Cuiying Zhou, Lihai Zhang
Summary: A multiphase numerical model was developed to simulate the rheological deformation of soft rock surrounding a tunnel after excavation. The model considers the coupled meso/macroscale creep and damage processes of the rock, and the predictions agree reasonably well with field monitoring data.
ROCK MECHANICS AND ROCK ENGINEERING
(2023)
Article
Construction & Building Technology
Mehrab Nodehi, Jie Ren, Xijun Shi, Solomon Debbarma, Togay Ozbakkaloglu
Summary: The decreasing trend in coal fly ash production has led to a growing interest in finding alternative materials for concrete production. This study investigated the use of glass powder as a replacement for fly ash in concrete. Experimental results showed that the performance of the glass powder varied depending on the type of binding system used, with higher mechanical performance observed in the portland cement system and the opposite conclusion in the alkali-activated system.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Tianshi Lu, Jie Ren, Xisheng Deng, Zhenming Li
Summary: This paper studies the effect of different supplementary cementitious materials (SCMs), such as silica fume and fly ash, on the physical properties and autogenous shrinkage of cement paste, both experimentally and numerically. The experimental results showed that the autogenous shrinkage of cement pastes significantly reduces with the increase of water-binder ratio. The addition of fly ash leads to smaller autogenous shrinkage, while the influence of dry densified silica fume on autogenous shrinkage is not significant.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Engineering, Civil
Boran Zhang, Xiaoshan Lin, Y. X. Zhang, Lihai Zhang
Summary: Many buildings are at risk of fire due to non-structural systems like high-pressure laminates and insulated cladding systems. Ultra-high-performance concrete (UHPC) has been used in cladding systems for its mechanical properties and non-flammable characteristic. Reinforcing UHPC with fibres like PP fibre can improve its mechanical properties under fire, but little research has been done on the internal stress and fire resistance of these claddings. Studying the fire behaviors and failure process of UHPPFRC panels is crucial for developing claddings with better fire resistance and durability.
ENGINEERING STRUCTURES
(2023)
Article
Astronomy & Astrophysics
Cuiying Zhou, Guangjun Cui, Linghua Kong, Zhen Liu, Wei Huang, Lei Yu, Lihai Zhang
Summary: The study compares the sedimentary environment and compositions of Martian sedimentary rocks and terrestrial red beds to characterize changes in the early Mars environment. Chemical compositions and mineral contents of Martian sedimentary rocks and terrestrial red beds were compared. Experiments replacing carbonates with sulfate in terrestrial red beds revealed that calcite was converted to gypsum. The results suggest that volcanic activity gradually replaced the carbon cycle with a sulfur cycle on Mars, leading to the replacement of carbonates with sulfates in Martian sedimentary rocks. This research contributes to the understanding of climate change on Mars.
Article
Computer Science, Interdisciplinary Applications
Enhao Zhang, Saeed Miramini, Lihai Zhang
Summary: This study investigates the combined effects of osteoporosis and diabetes on fracture healing process by developing numerical models. The results show that osteoporotic fractures have higher instability and disruption in mesenchymal stem cells' proliferation and differentiation compared to non-osteoporotic fractures. Moreover, when osteoporosis coexists with diabetes, the healing process of fractures can be severely impaired.
COMPUTER METHODS AND PROGRAMS IN BIOMEDICINE
(2024)
