Article
Construction & Building Technology
Ji-Hyun Kim, Ik-Je Choi, Chul-Woo Chung
Summary: The research found that adding SWCNT solutions decreased the plastic viscosity of cement paste but increased yield stress, as well as improving compressive and flexural strength. Although cement paste with SWCNT dispersed by AEA showed lower mechanical strength than that dispersed by DOC, it is still feasible for use as a dispersing agent due to its higher mechanical strength compared to plain cement paste.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Mechanics
Soheil Firooz, George Chatzigeorgiou, Paul Steinmann, Ali Javili
Summary: This manuscript incorporates a novel interface model into the Mori-Tanaka method to determine effective properties and average local fields of composites. The significance of interface position on the overall response of heterogeneous materials is highlighted through computational simulations and numerical examples.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2022)
Article
Mechanics
Soheil Firooz, George Chatzigeorgiou, Paul Steinmann, Ali Javili
Summary: This paper introduces a new interface model that allows for arbitrary interface positions and highlights the importance of interface position on the overall response of heterogeneous materials. Through analytical solutions and finite element method simulations and comparisons, the effectiveness and applicability of the interface model are validated.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2022)
Article
Materials Science, Multidisciplinary
Diwakar Swaroop, Deepjyoti Dhar, Anandavel Suriyan, Atul Jain
Summary: This paper introduces the commonly used mean field homogenization methods and their applications in composite materials, analyzes the issues of multi-step Mori-Tanaka method in terms of physical admissibility and accuracy of predictions, and compares and evaluates multiple implementation schemes.
MECHANICS OF MATERIALS
(2022)
Article
Mechanics
Przemyslaw Sadowski, Katarzyna Kowalczyk-Gajewska, Stanislaw Stupkiewicz
Summary: The Mori-Tanaka model combines simplicity and good predictive capabilities, but the use of the Perzyna-type viscoplasticity model may lead to spurious softening in the macroscopic response.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2021)
Article
Construction & Building Technology
Jialin Chen, Bo Chen, Xudong Chen, Sheng Qiang, Yongjie Zheng
Summary: This study characterized the pore structure parameters of foamed cement paste with different densities using various testing methods. The results showed that combining nuclear magnetic resonance and X-ray computed tomography can provide the full pore size of foamed cement paste, while vacuum saturation device testing results were closer to the true porosity. Spheroid was found to be the main pore shape, and the pore wall thickness increased with the increase in density of foamed cement paste.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Mechanics
Khaoula Dorhmi, Katell Derrien, Zehoua Hadjem-Hamouche, Leo Morin, Frederic Bonnet, Jean-Pierre Chevalier
Summary: This study investigates the effective properties of Fe-TiB2 composites obtained after hot or cold rolling, measuring the elastic moduli experimentally and using various methods. Microstructure analyses based on SEM observations are conducted to characterize particle and cracks distribution, and 3D representative microstructures are generated using the RSA method. The overall elastic behavior of the composites is determined numerically through full-field FFT-based simulations, showing a significant improvement in specific stiffness compared to standard steels regardless of processing conditions.
COMPOSITE STRUCTURES
(2021)
Article
Construction & Building Technology
Fengwen Zhao, Jianhua Hu, Dongjie Yang, Ye Kuang, Hongxing Xiao, Minghua Zheng, Xueliang Wang
Summary: The experimental results indicate that air-entraining agents can regulate the pore structure changes in backfill materials, with a significant impact on the material's strength. As the content of air-entraining agents increases, the proportion of different pore sizes changes, affecting the strength of the backfill material.
ADVANCES IN CIVIL ENGINEERING
(2021)
Article
Mechanics
Qiang Chen, George Chatzigeorgiou, Fodil Meraghni
Summary: This paper proposes an extended Mori-Tanaka approach to study the piezoelectric response of unidirectional nanoporous composites with energetic surfaces. The simulation includes the consideration of interface using the generalized Gurtin-Murdoch coherent interface model. Analytical solutions for Eshelby's inhomogeneity problems are obtained and the extended multiphysics Mori-Tanaka homogenization scheme is utilized. Comparison with other methods shows the reliability and accuracy of the proposed approach.
COMPOSITE STRUCTURES
(2023)
Article
Engineering, Civil
Yue Li, Yunze Liu, Caiyun Jin
Summary: This paper investigated the effect of microwave pretreatment on the electromagnetic properties of cement paste. After standard conditioning, four different durations of microwave pretreatment were performed on cement paste specimens. The results showed that microwave pretreatment can improve the electromagnetic loss and dielectric constant of the specimens, but has no significant effect on magnetic permeability.
ARCHIVES OF CIVIL AND MECHANICAL ENGINEERING
(2023)
Article
Materials Science, Multidisciplinary
George Chatzigeorgiou
Summary: The study demonstrates that multilayered composite structures can be utilized for validating micromechanics techniques and provide the same solution as periodic homogenization methods.
MECHANICS OF MATERIALS
(2022)
Article
Materials Science, Characterization & Testing
Hao Zhang, Song Mu, Jingshun Cai, Jianzhong Liu, Jinxiang Hong
Summary: Hydrophobic treatment can greatly improve the durability of concrete structures. This study uses X-ray computed tomography technology to investigate the pore system of cementitious materials modified by a new type of carboxylic acid hydrophobic agent. The addition of the hydrophobic agent increases the volume of large pores and modifies the water transportation channels, resulting in the hydrophobicity of cement pastes. This research provides insights into the hydrophobic mechanism and guidance for designing new microstructures of cementitious materials.
NONDESTRUCTIVE TESTING AND EVALUATION
(2023)
Article
Construction & Building Technology
Ji-Su Kim, Jeewoo Suh, Junil Pae, Juhyuk Moon, Tong-Seok Han
Summary: This study investigated the microstructural evolution of cement paste during hydration using micro-CT imaging and developed a phase segmentation method based on mean LAC values. The method proved effective in identifying characteristics of pores, hydrates, and clinkers.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Construction & Building Technology
Regina Kalpokaite-Dickuvien, Stase Irena Lukosiute, Arunas Baltusnikas, Jurate Cesniene
Summary: The study investigated the impact of different hydrophobic organically modified clays on hydration, microstructure, mechanical, and water absorption properties of cement formulations. Results showed that OC with aromatic substitute groups and larger d(001) demonstrated higher mechanical strength and lower sorptivity in cement compositions.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Qing Wang, Zihao Xiong, Jianqiang He, Mianheng Lai, Johnny Ho
Summary: Calcination above 500 degrees C effectively optimizes the pore structure of zeolite and improves the rheological performance of cement pastes containing zeolite.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Green & Sustainable Science & Technology
Jaebum Sung, Hoo Min Lee, Gil Ho Yoon, Sungchul Bae, Hongyun So
Summary: Polymer surfaces with wettability gradient were fabricated using 3D printing technology to control droplet velocity. This method is simple, rapid, and cost-effective, and can effectively reduce droplet splashing distance.
INTERNATIONAL JOURNAL OF PRECISION ENGINEERING AND MANUFACTURING-GREEN TECHNOLOGY
(2023)
Article
Materials Science, Ceramics
Farayi Musharavati, Fadi Jaber, Mohamed Nasor, Masoud Sarraf, Erfan Zal Nezhad, Kaan Uzun, Ye Ma, Sungchul Bae, Ramesh Singh, Muhammad E. H. Chowdhury
Summary: This study investigated the mechanical properties, wettability, and tribology of hydroxyapatite-zirconia-carbon nanotube ceramic nanocomposites with different carbon nanotube ratios (1%, 5%, 10%). The results showed that the hardness of the materials increased with the addition of 1% and 5% carbon nanotubes, but decreased with the addition of 10% carbon nanotubes. In addition, the nanocomposite with 10% carbon nanotubes exhibited the highest hydrophilicity.
CERAMICS INTERNATIONAL
(2023)
Article
Construction & Building Technology
Dong-Hee Son, Dongsun Hwangbo, Heongwon Suh, Baek-Il Bae, Sungchul Bae, Chang-Sik Choi
Summary: The purpose of this study was to develop concrete with improved mechanical performance by using a combination of various nanomaterials (f-CNTs, NS, GO). The researchers proposed a method for mixing concentrated aqueous solution by applying a dispersion method based on the functional group ratio of the nanomaterials. The mechanical performance of the concrete was evaluated through uniaxial compression and splitting tensile tests, and it was found that the incorporation of nanomaterials increased splitting tensile strength and elastic modulus.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2023)
Article
Construction & Building Technology
Sumin Im, Hyeonseok Jee, Heongwon Suh, Manabu Kanematsu, Satoshi Morooka, Hongbok Choe, Nishio Yuhei, Akihiko Machida, Jihoon Kim, Seungmin Lim, Sungchul Bae
Summary: In this study, the mechanical properties and deformation behavior of synthetic C-S-H pastes with different Ca/Si ratios under external loading were investigated. It was found that the presence of multiscale pores in the pastes allowed the stress to be transferred from the surface to the particles, resulting in different deformation behavior.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Green & Sustainable Science & Technology
Haemin Song, Juan Yu, Jae Eun Oh, Jung-Il Suh
Summary: The study focuses on the development of lightweight cementitious binders to replace autoclaved aerated concrete blocks and improve the efficiency of buildings for carbon neutrality. Fly ash and fly ash cenosphere activated with Ca(OH)(2) and Na2CO3 binders were assessed for their mechanical properties and further characterized for microstructure and thermal performance. The results showed that increasing the content of fly ash cenosphere increased the porosity of the hardened matrix and reduced the weight of the binders. Additionally, the thermal conductivity of the binders was significantly reduced, increasing their thermal efficiency.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Construction & Building Technology
Seongmin Cho, Jaeyeon Park, Heongwon Suh, Gyeongryul Kim, Jun Lim, Seungwook Seok, Sungchul Bae
Summary: This study proposes using ultrasonic treatment to enhance the decontamination efficiency of cement waste at lower acid concentration, and investigates the phase transitions and decontamination efficiency of hydrates and Co nuclides in the cement paste using different concentrations of sulfuric acid. The study also examines the effect of pre-heating the acid-treated cement paste at 500 degrees Celsius on its phase transition and decontamination efficiency. The findings reveal that ultrasound-assisted decontamination with 1.0 M H2SO4 is 1.5 times more efficient than non-sonication-assisted decontamination with double the acid concentration (2.0 M H2SO4), due to the detachment of obstructive outer-layer phases.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Hyunuk Kang, Yangwoo Lee, Jihoon Lee, Juhyuk Moon
Summary: A quantitative phase analysis of nine different clinkers was conducted using XRD, and density function theory simulation was applied to support the observed phenomenon regarding the preferred orientation effect on mineral phases induced by micro-grinding. The QXRD result overestimated the amount of C4AF phase when excluding amorphous content, but a reasonable amount was obtained when considering amorphous content. Micro-grinding induced phase transition of C3S (M3) to nano-crystalline phase, but the well-refined preferred orientation at C3S (M3) peaks was confirmed. Therefore, the crystallographic effects from micro-grinding contribute to accurate quantification of clinker materials.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Construction & Building Technology
Jung-Il Suh, Woo Sung Yum, Yeonung Jeong, Seyoon Yoon, Hong-Gun Park, Jae Eun Oh
Summary: The purpose of this study is to develop a new binder system composed of activated fly ash with CaO by adding magnesium nitrate as a new additive. The results showed that adding magnesium nitrate significantly increased the strength of the binder system and enhanced mechanical strength by reducing porosity in the binder matrix.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Construction & Building Technology
Jusung Yang, Juhyuk Moon
Summary: This study aimed to track the initial water-to-cement (w/c) ratio of hardened concrete by visualizing capillary porosity. Various image processing methods were evaluated for their accuracy in analyzing the fluorescence intensity of dyed epoxy resin infiltrated capillary pores to trace the initial w/c ratio. A proportional relationship was established between the quantified fluorescence intensity and the designed w/c ratios of the paste, mortar, and concrete samples. The most suitable method for evaluating the initial w/c ratio was proposed based on the comparison with visual analysis.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Mandip Dahal, Yanchen Oinam, Prabhat Vashistha, Jae-Eun Oh, Sukhoon Pyo
Summary: This study proposes a novel method to develop cementless ultra-high performance concrete (UHPC) by activating ground granulated blast furnace slag (GGBFS) without an alkaline-activating solution. Calcium oxide (CaO) was used to activate GGBFS, and calcium formate (CF) was added as an accelerator. The addition of CF improved the mechanical properties and reduced CO2 emissions compared to cement-based UHPC.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Construction & Building Technology
Juan Yu, Sungwon Sim, Haemin Song, Dohoon Kim, Kyungcheol Jang, Dongho Jeon, Seung Cho, Jae Eun Oh
Summary: This study investigated the impact of nano-alumina crystallinity on the sulfate resistance of ordinary Portland cement paste. Two crystalline types of nano-aluminas (α- and β-phase) were added to cement pastes and exposed to sulfate solution. The results showed that both types of nano-alumina led to accelerated compressive strength loss and increased length expansion. The decreased dynamic elastic modulus suggested increased internal stress due to the formation of volume expansive reaction products. The presence of β-alumina resulted in a greater degree of gypsum formation and subsequent sulfate attack compared to α-alumina.
INTERNATIONAL JOURNAL OF CONCRETE STRUCTURES AND MATERIALS
(2023)
Article
Construction & Building Technology
Sungjin Jung, Hyunuk Kang, Sung-Hoon Kang, Juhyuk Moon
Summary: This study aims to elucidate the origin of the improvement in mechanical properties of ordinary Portland cement hydrates with the use of alkanolamine grinding agent. The use of the grinding agent led to improvements in both early and later strength. Specifically, the agent enhanced the hydration of certain phases in the cement, resulting in increased formation of specific minerals. The agent also inhibited the growth of certain phases, leading to higher amounts of amorphous phase.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Woo-Young Park, Juhyuk Moon
Summary: A new machine learning model has been developed in this study to efficiently predict the amorphous content in South Korea-produced FA F type fly ash. By predicting the contents of CaO and SiO2, the amount of aluminosilicate glass can be accurately predicted. The prediction performance of the model is further improved by combining three ensemble techniques.
INTERNATIONAL JOURNAL OF CONCRETE STRUCTURES AND MATERIALS
(2023)
Article
Construction & Building Technology
Jingwei Yang, Dongho Jeon, Hyunuk Kang, Xiaoyu Shang, Juhyuk Moon
Summary: This study investigates the improvement of flow behavior in lightweight high-performance cementitious composites by adding microspheres with hydrophobic treatment. The hydrophobic microspheres do not absorb water and delay the contact time between cement particles and water, resulting in increased hydration product formation and flowability.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Hyunuk Kang, Ahyeon Lim, Juhyuk Moon
Summary: This study explores the use of sodium carbonate anhydrous (Na2CO3) to enhance the reactivity of bottom ash (BA) in the ordinary Portland cement (OPC) system. The presence of Na2CO3 improves the pozzolanic reactions between BA and calcium hydroxide, resulting in remarkable improvements in the mechanical properties of the BA-OPC composite. By adding a very small amount of Na2CO3, the compressive strength of the BA-OPC composite can be significantly increased, contributing to its sustainable development.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
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)
