Review
Nanoscience & Nanotechnology
Kaiwei Liu, Wanyu Xu, Daosheng Sun, Jinhui Tang, Aiguo Wang, Dong Chen
Summary: Research shows that carbonation can improve the physical properties of RA, with optimal effects achieved by adjusting carbonation conditions. RAC with carbonized RA exhibits denser new and old ITZs, leading to improved microstructure and performance.
Article
Environmental Sciences
Manuel Contreras Llanes, Maximina Romero Perez, Manuel Jesus Gazquez Gonzalez, Juan Pedro Bolivar Raya
Summary: The study showed that using up to 50% of recycled aggregates from construction and demolition waste is feasible for manufacturing eco-friendly concrete, and can also be used to produce paving blocks that meet industrial standards. By reducing cement incorporation, production costs were saved and environmental impact minimized.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Construction & Building Technology
Tiago Luis Possebon Ortolan, Pietra Moraes Borges, Laura Silvestro, Sergio Roberto da Silva, Edna Possan, Jairo Jose de Oliveira Andrade
Summary: This study evaluated the effects of different replacement contents of recycled aggregates on the performance of concrete and found that applying surface treatments can improve the durability and service life of recycled aggregate concrete.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Prakhash Neelamegam, Bhuvaneshwari Muthusubramanian
Summary: This investigation explores the influence of Polyethylenimine (PEI) on the improvement of carbon dioxide (CO2) uptake, surface texture, and pore structure of construction and demolition waste (CDW) through carbonation. The study found that PEI modification of CDW enhances carbonation efficiency by reducing pores more effectively and improves surface morphology and compressive strength. The study highlights the potential of PEI modification as an effective approach to improve the properties of CDW and its potential as a sustainable construction material.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Review
Construction & Building Technology
Seweryn Malazdrewicz, Krzysztof Adam Ostrowski, Lukasz Sadowski
Summary: The demolition of old concrete structures is increasing due to technical issues, end of service-life, and modernization plans. This process generates Concrete Construction and Demolition Waste (CC&DW), which is often transported and deposited in landfills if not recycled. Researchers have studied the use of recycled materials from CC&DW in Self-Compacting Concrete (SCC), particularly in the form of Recycled Coarse Aggregate (RCA), as it can significantly reduce waste. However, there is still a lack of complete understanding of the processes involved in SCC with RCA, necessitating further research.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Engineering, Environmental
Abhijit Mistri, Navdeep Dhami, Sriman Kumar Bhattacharyya, Sudhirkumar Barai, Abhijit Mukherjee, Wahidul K. Biswas
Summary: The use of bacterial cement and conventional cement slurry coating treatment on recycled coarse aggregates helps overcome shortcomings such as excessive water absorption, weak interfacial transition zone, and high porosity. Concrete with microbial carbonate precipitation (MCP) treated aggregate performs better than untreated recycled aggregate based concrete mixes, but marginally higher environmental impacts were observed due to additional emissions associated with the biocement treatment of RCA. Further environmental mitigation strategies are being considered to improve the environmental performance of concrete with MCP treated aggregates.
RESOURCES CONSERVATION AND RECYCLING
(2021)
Article
Chemistry, Multidisciplinary
David Suescum-Morales, Lorenzo Salas-Morera, Jose Ramon Jimenez, Laura Garcia-Hernandez
Summary: This article introduces a novel method using artificial neural network model to predict the compressive strength of recycled aggregate concrete, demonstrating its efficiency in dealing with heterogeneous and noisy data through different training methods and a large dataset of concrete mixes.
APPLIED SCIENCES-BASEL
(2021)
Article
Chemistry, Physical
Jeonghyun Kim, Anna M. Grabiec, Andrzej Ubysz
Summary: This study evaluates the effects of different recycled concrete materials on the mechanical properties of concrete. The results show that the concrete properties deteriorate with increasing replacement ratio of recycled materials.
Article
Green & Sustainable Science & Technology
Wanchai Yodsudjai, Kirati Nitichote
Summary: This research found that the quality of recycled aggregate waste significantly impacted the behavior of concrete, finer aggregate increased the weakness part of the concrete resulting in lower compressive strength and increased chloride ion penetration.
Review
Chemistry, Physical
Markssuel Marvila, Paulo de Matos, Erich Rodriguez, Sergio Neves Monteiro, Afonso R. G. de Azevedo
Summary: Construction and demolition activities generate large amounts of waste, requiring the extraction of vast quantities of natural aggregate. By substituting natural aggregate with recycled aggregate from waste, environmental problems can be reduced. While the use of recycled aggregate may slightly decrease concrete performance, this reduction is negligible when replacement levels are below 30%. Efforts should focus on improving the efficiency of recycled aggregate processing and standardization.
Article
Mathematics, Interdisciplinary Applications
Chang-Qing Quan, Chu-Jie Jiao, Wei-Zhi Chen, Zhi-Cheng Xue, Rui Liang, Xue-Fei Chen
Summary: This study investigates the influence of aggregate fractal dimensions on the properties of recycled aggregate concrete (RAC). The results show that the fractal dimension affects the workability, compressive strength, resistance to chloride ion penetration, and carbonation resistance of RAC. The optimal fractal dimension is determined to be 2.547. Additionally, the size distribution of the aggregate and the degree of natural carbonation play a role in the carbonation resistance of RAC.
FRACTAL AND FRACTIONAL
(2023)
Article
Green & Sustainable Science & Technology
Sami W. Tabsh, Yazan Alhoubi
Summary: This study investigated the potential of using locally produced recycled fine aggregate in new concrete mixes to replace sand. Results showed that the recycled fine aggregate has cementitious properties and can match or exceed the compressive and tensile strength of concrete made with virgin aggregate in certain cases.
Article
Construction & Building Technology
Junhui Zhang, Cheng Li, Le Ding, Jian Li
Summary: This study experimentally investigated the performance of cement-stabilized recycled mixture, revealing that the mechanical properties of cement-stabilized mixtures change with the proportion of recycled aggregate. The conclusion suggests that in road construction, the amount of recycled aggregate should not exceed 50%, and the ratio of crushed brick to recycled concrete aggregate should not exceed 3:7.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
S. Tejas, Dinakar Pasla
Summary: The decade from 2014 to 2024 is the sustainable decade, which requires the development of eco-friendly building materials and the adoption of sustainable construction practices. The use of more industrial by-products reduces the environmental carbon footprint of cement manufacturing. As the demand for natural aggregates increases, recycled aggregates or recycled concrete coarse aggregates are being used as alternatives. However, there is a lack of research on the use of composite cement and 100% recycled concrete aggregates. This study developed composite cement-based, recycled aggregate concrete and evaluated its mechanical and durability properties.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Engineering, Civil
Ana Baricevic, Dragan Kovac, Katarina Didulica
Summary: This study confirmed that by complying with standards for recycled aggregates and knowing their origin, it is possible to produce concrete with properties equivalent to those of ordinary concrete for specified durability conditions.
Article
Ecology
Yalong Wang, Chaoying Li, Haidong Liu, Jin Lin, Shouxiang Lu, Kim Meow Liew
Summary: The electric fault arc, especially the series arc, causes numerous electrical fires. Previous studies have limitations in focusing on gaseous atmospheres instead of solid materials, which is not in line with the actual demand, and in restricting the studied external heat sources to cone heaters and flames, neglecting the electric arc. To overcome these limitations, an experimental platform was developed to investigate flame behavior during the ignition of cable insulation material by the fault arc. A flame-extracting and noise-reduction algorithm was proposed to process the high-speed camera's large number of photos. The main findings include the significant role of the appropriate size of the structuring element in filtering the flame region, the increase in mean flame area with system load growth, and the more prominent flame size and frequency in specific locations with increased system load. The in-depth understanding of flame behavior provided by this work will contribute to optimizing electric system design and disaster prevention.
Article
Chemistry, Physical
Gen Li, Arslan Akbar, Lu-Wen Zhang, F. Rosei, K. M. Liew
Summary: Solid substrates of cementitious composites in high salinity and humidity environments are covered by fluid water, which affects the wetting behavior of cement hydrates and chloride ingress phenomena. This study investigates the nanoscale wetting behaviors of calcium silicate hydrate (C-S-H) and proposes a surface modification strategy using fluoroalkylsilane (FAS) to control hydrophobicity. Molecular dynamic simulation reveals that FAS creates superhydrophobic surfaces, eliminating calcium leaching by hindering ionic interactions and blocking chloride adsorption and invasion.
APPLIED SURFACE SCIENCE
(2023)
Article
Mechanics
B. B. Yin, Arslan Akbar, Yang Zhang, K. M. Liew
Summary: This study presents a coupled phase-field cohesive modeling framework that can accurately capture the progressive failure and damage behaviors of multiphasic microstructures and multifiber systems. The framework includes novel aspects such as a newly developed scalar indicator, periodic boundary conditions, and characterization of various failure modes. Parametric studies show consistent results with experiments and reveal the effects of fiber distributions, fiber volume fractions, and boundary conditions on the mechanical behaviors of fiber-reinforced composites. The results demonstrate the potential of the framework in evaluating the mechanical performances of composite materials in engineering applications.
COMPOSITE STRUCTURES
(2023)
Article
Mechanics
D. A. Abdoh, Yang Zhang, A. S. Ademiloye, V. K. R. Kodur, K. M. Liew
Summary: In order to predict the heating and cooling behaviors of laminated glass facades exposed to fire, a precise and efficient computer model is developed. An efficient three-dimensional finite difference method (3DFDM) is proposed to reduce the computational requirements associated with simulating heat transfer in layered structures with a down-flowing water film. A unique computational algorithm for particle labeling is developed to capture the moving particles of the water film, which significantly reduces the computational effort.
COMPOSITE STRUCTURES
(2023)
Article
Construction & Building Technology
Gen Li, Arslan Akbar, Lu-Wen Zhang, Federico Rosei, K. M. Liew
Summary: This article focuses on an original molecular pathway to predict the durability and analyze the environmental impact of fluoroalkyl-silane (FS) based additive modified cementitious composites in marine environment. By revealing the calcium leaching behaviors of cement composites through molecular simulation, the study evaluates the porosity and chloride diffusion coefficient to determine their lifespan. The results show that FS surface modification can eliminate decalcification, decrease porosity, and slow down chloride accumulation. The optimal mixing content of 0.762 wt % FS significantly reduces repair frequencies and diminishes CO2 emissions and non-renewable energy consumption by 52.33% and 31.07% respectively. This research provides atomic understanding for improving the durability of cement composites and proposes strategies to predict their service life and environmental impact.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Mechanics
A. O. Sojobi, K. M. Liew
Summary: High performance column composites are multifunctional composites designed to improve resilience of structures and infrastructures. They have been found attractive in earthquake-prone regions for their superior mechanical performance.
COMPOSITE STRUCTURES
(2023)
Article
Mechanics
Z. X. Lei, Junwei Ma, W. K. Sun, B. B. Yin, K. M. Liew
Summary: Composite structures can experience significant residual strength reduction due to invisible damage caused by impacts, which can result in severe harm without warning. Incorporating fibers, such as carbon and glass fibers, into composite laminates can enhance their impact resistance and compressive strength. This study investigated the dynamic response and residual strength of laminates reinforced with twill woven carbon fiber, glass fiber, and carbon/glass fiber hybrid under low-velocity impact and compression-after-impact testing. The results showed that adding glass fibers altered the impact damage mode and improved the laminates' impact resistance and compressive strength. The study also characterized the damage morphologies and failure mechanisms of the laminates, providing valuable insights for their structural design and performance improvement.
COMPOSITE STRUCTURES
(2023)
Article
Engineering, Manufacturing
G. Li, B. B. Yin, L. W. Zhang, K. M. Liew
Summary: Fibers effectively prevent the structural deterioration of cementitious composites under repeated loadings. The interface between fiber and hydraulic cement matrix has mysterious fatigue behavior. This work demonstrates by atomic modelling that fiber, pore water, and calcium silicate hydrate (C-S-H) create a dynamically balanced system, keeping the stability of cement matrix under cyclic loading.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2023)
Article
Engineering, Multidisciplinary
B. B. Yin, W. K. Sun, Yang Zhang, K. M. Liew
Summary: Polymer gels can be effectively simulated using a three-dimensional meshfree framework based on bond-based peridynamics, which enables dynamic simulations with complex geometric configurations. The proposed method exhibits superior performance in modeling blunt impacts on polymer gels compared to finite element counterparts, and can be easily extended to penetration impact problems.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2023)
Article
Engineering, Multidisciplinary
Jiasheng Huang, Lu-Wen Zhang, K. M. Liew
Summary: This work proposes a novel hybrid polymer-water model within the peridynamics (PD) framework to accurately clarify the complex damage process of soft materials subject to ballistic penetration. The superior effectiveness and applicability of the proposed model are demonstrated through compression, shear, and fracture tests. The proposed model offers a reasonable and practical representation of soft material from the perspective of a particle-based approach and enhances the potential applications of PD framework for simulating the large deformation and dynamic response of soft materials.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2023)
Article
Environmental Sciences
Renjie Mi, Tao Yu, Chi Sun Poon
Summary: Carbon sequestration in concrete can be achieved by using the space in porous coarse aggregates and cations in alkaline slurry without affecting concrete strength development or pH value of the concrete pore solution. Experimental results demonstrate the feasibility of this method.
ENVIRONMENTAL RESEARCH
(2023)
Article
Environmental Sciences
Renjie Mi, Zhibin Zhang, Weiming Ji, Shichang Liu, M. F. Kai, Kui Lin, Yongshan Tan
Summary: The solidification/stabilisation behaviours of Zn2+ in magnesium potassium phosphate cement (MKPC) were investigated through experiments and density functional theory (DFT) study. The addition of Zn2+ reduced the compressive strength of MKPC by delaying the formation of MgKPO4 center dot 6H(2)O and exhibiting lower binding energy compared to Mg2+. Zn2+ existed as Zn-2(OH)PO4 in MKPC and had little influence on the structure of MgKPO4 center dot 6H(2)O.
ENVIRONMENTAL RESEARCH
(2023)
Article
Green & Sustainable Science & Technology
Weiwei Zhang, Hao Yu, Binbin Yin, Arslan Akbar, K. M. Liew
Summary: This review explores the recycling of end-of-life wind turbine blades (EoL-WTBs) and their potential applications in civil engineering. Mechanical, thermal, and chemical recycling methods are examined, highlighting the hierarchical valorization of EoL-WTBs recyclates in construction. However, challenges such as technical complexity, cost, market demand, and regulatory frameworks hinder widespread adoption. Standardization, efficient transportation systems, well-structured recycling supply chains, and economic feasibility analysis are recommended to address these issues.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Green & Sustainable Science & Technology
B. B. Yin, Gen Li, Yang Zhang, K. M. Liew
Summary: In this study, a molecular model was developed to describe the optimized properties of LC3 blend, revealing the relationship between its structure and mechanical properties, tensile deformation behaviors, and failure mechanisms. The findings provide insights into the development of sustainable cementitious composites for the construction industry with lower environmental impacts.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Engineering, Multidisciplinary
W. K. Sun, B. B. Yin, Arslan Akbar, V. K. R. Kodur, K. M. Liew
Summary: This paper proposes a variable timestep-strategy to accelerate the peridynamic modeling of thermomechanical cracking, and demonstrates its advantages in various aspects.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2024)
Article
Green & Sustainable Science & Technology
Lars odegaard Bentsen, Narada Dilp Warakagoda, Roy Stenbro, Paal Engelstad
Summary: This study investigates uncertainty modeling in wind power forecasting using different parametric and non-parametric methods. Johnson's SU distribution is found to outperform Gaussian distributions in predicting wind power. This research contributes to the literature by introducing Johnson's SU distribution as a candidate for probabilistic wind forecasting.
JOURNAL OF CLEANER PRODUCTION
(2024)
Article
Green & Sustainable Science & Technology
Xing Liu, Qiuchen Wang, Yunhao Wen, Long Li, Xinfang Zhang, Yi Wang
Summary: This study analyzes the characteristics of process parameters in three lean gas ethane recovery processes and establishes a prediction and multiobjective optimization model for ethane recovery and system energy consumption. A new method for comparing ethane recovery processes for lean gas is proposed, and the addition of extra coolers improves the ethane recovery. The support vector regression model based on grey wolf optimization demonstrates the highest prediction accuracy, and the multiobjective multiverse optimization algorithm shows the best optimization performance and diversity in the solutions.
JOURNAL OF CLEANER PRODUCTION
(2024)
Article
Green & Sustainable Science & Technology
Cairong Song, Haidong Yang, Xian-Bing Meng, Pan Yang, Jianyang Cai, Hao Bao, Kangkang Xu
Summary: The paper proposes a novel deep learning-based prediction framework, aTCN-LSTM, for accurate cooling load predictions. The framework utilizes a gate-controlled multi-head temporal convolutional network and a sparse probabilistic self-attention mechanism with a bidirectional long short-term memory network to capture both temporal and long-term dependencies in the cooling load sequences. Experimental results demonstrate the effectiveness and superiority of the proposed method, which can serve as an effective guide for HVAC chiller scheduling and demand management initiatives.
JOURNAL OF CLEANER PRODUCTION
(2024)
Article
Green & Sustainable Science & Technology
Zhe Chen, Xiaojing Li, Xianli Xia, Jizhou Zhang
Summary: This study uses survey data from the Loess Plateau in China to evaluate the impact of social interaction on the adoption of soil and water conservation (SWC) technology by farmers. The study finds that social interaction increases the likelihood of farmers adopting SWC, and internet use moderates this effect. The positive impact of social interaction on SWC adoption is more pronounced for farmers in larger villages and those who join cooperative societies.
JOURNAL OF CLEANER PRODUCTION
(2024)
Article
Green & Sustainable Science & Technology
Chenghua Zhang, Yunfei Yan, Kaiming Shen, Zongguo Xue, Jingxiang You, Yonghong Wu, Ziqiang He
Summary: This paper reports a novel method that significantly improves combustion performance, including heat transfer enhancement under steady-state conditions and adaptive stable flame regulation under velocity sudden increase.
JOURNAL OF CLEANER PRODUCTION
(2024)
