Article
Engineering, Environmental
Chao Liu, Claude Berard, Lijun Deng
Summary: Deep soil mixing with high cement contents in cold regions is important but not well studied. This study examined the mechanical behavior of soilcrete under freezing/thawing conditions. The results showed that the compressive and tensile strength of soilcrete increased with curing age but decreased with more freezing/thawing cycles. The lower temperature caused more severe damage and the mass loss reflected the impact of freezing/thawing cycles.
COLD REGIONS SCIENCE AND TECHNOLOGY
(2023)
Article
Mechanics
S. Smaniotto, M. Neuner, A. Dummer, T. Cordes, G. Hofstetter
Summary: This study presents a comprehensive experimental program on the mechanical, hygral and thermal behavior of modern wet mix shotcrete, laying the foundation for the thorough calibration and validation of material models for wet mix shotcrete.
ENGINEERING FRACTURE MECHANICS
(2022)
Article
Construction & Building Technology
Bailin Li, Fei Luo, Xiaodong Li, Jiaming Liu
Summary: This paper presents an experimental study on the role of rice husk ash (RHA) in the mechanical improvement of soil. The results show that the incorporation of RHA substantially enhances the soil's strength, stiffness, and ductility. The study findings contribute to guiding the effective application of RHA in civil engineering and promoting the sustainable development of construction materials.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2024)
Article
Construction & Building Technology
Yu Wan, Ruzhuan Wang, Yumeng Liu, Shan Zhou, Hongwei Cai, Mingyu Gu, Dingyu Li, Weiguo Li
Summary: This study develops a series of novel temperature-dependent theoretical models based on the force-heat equivalence energy density principle and classical concrete fracture theories to determine the fracture properties of concretes. The models establish a quantitative relationship between the high-temperature tensile fracture strength, compressive fracture strength, and characteristic length of concretes and the basic material parameters. The fracture properties of concretes with different aggregate types, fiber-reinforced concretes, and ordinary Portland cement-based concretes are predicted and analyzed using the proposed models, showing good agreement with experimental measurements.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Engineering, Chemical
Faramarz Moodi, Mohammad Bagheri, Pooria Dashti, Ali Akbar Ramezanianpour
Summary: This study investigates the factors affecting the repair of cracks in concrete structures using epoxy resin injection, including epoxy viscosity, crack width, and crack moisture content. Commercial epoxy resins with high, medium, and low viscosities were used to inject simulated cracks, and repair methods were tested under different moisture conditions. The results show that injecting in dry conditions yields the best repair results.
INTERNATIONAL JOURNAL OF ADHESION AND ADHESIVES
(2023)
Article
Energy & Fuels
Lianzhi Yang, Tong Niu, Fanmin He, Zhiyong Song
Summary: In this study, uniaxial compression and Brazil splitting tests were conducted on gneiss cores of different orientations from the Bozhong 196 gas field in China. The compression and tensile properties of the gneiss were studied. The results showed that gneiss specimens with horizontal core-taking had higher elastic compression modulus, compressive strength, tensile strength, and peak energy rate compared to those with vertical core-taking.
Article
Physics, Multidisciplinary
Enling Tang, Chang Liu, Mengzhou Chang, Yafei Han, Chuang Chen
Summary: The dynamic compression mechanical properties of ice are greatly affected by impurities and environmental temperature. Adding cotton to ice specimens increases their compressive strength under the same freezing temperature. At low impact velocities, axial cracks are observed with integrity maintained; at high impact velocities, significant plastic deformation occurs due to dislocation movement along oblique cracks. The energy characteristics of specimens with different cotton content are positively correlated with impact velocity.
EUROPEAN PHYSICAL JOURNAL PLUS
(2022)
Article
Construction & Building Technology
Yi Liu, Pengfei Ren, Natividad Garcia-Troncoso, Kim Hung Mo, Tung-Chai Ling
Summary: This study aims to investigate the compressive strength and tensile bond strength of concrete made with recycled aggregates (RAs). The results showed that despite the weaker intrinsic properties of the RAs, the RCA and RCBA concrete exhibited higher compressive strength and tensile bond strength compared to the natural aggregate (NA) concrete. Microhardness testing and SEM-BSE image analysis further confirmed the enhanced performance of the interfacial transition zone (ITZ) in the RAs concretes.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Construction & Building Technology
Yin Shiping, Feng Linli, Zhao Junling
Summary: The tensile and bending mechanical properties of Textile-Reinforced Engineered Cementitious Composite (TRE) are significantly affected by factors such as freezing-thawing cycles, textile layers, surface treatment, PVA fiber content, etc. Different conditions can result in varied mechanical performance of TRE specimens.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Polymer Science
Qiaoyu Wang, Jianbin Wang, Anheng Wang, Chaoqun Zhou, Jiale Hu, Fei Pan
Summary: This study aims to analyze the effects of temperature and strain rate on the tensile properties of long glass fiber-reinforced polypropylene composites. The experimental results show that both tensile strength and tensile fracture stress increase significantly at a temperature of 25°C and strain rates of 10(-4), 10(-3), 10(-2), and 10(-1) s(-1). On the other hand, these properties decrease significantly when the strain rate is fixed at 10(-4) while temperatures range from -25°C to 75°C. Cracks appear on the fracture surface at lower temperatures, while matrix softening occurs at higher temperatures. These findings emphasize the significant influence of both strain rate and temperature on high fiber content long glass fiber-reinforced polypropylene composites.
Article
Mechanics
Jipeng Zhao, Xiangrui Meng, Lianjun Chen, Guoming Liu, Zongxi Zhang, Qianqian Xu
Summary: This study examines the relationship between the mechanical properties of fiber reinforced shotcrete (FRS) and fiber fracture morphology by adding different fiber materials. It identifies the importance of optimal fiber size in enhancing the mechanical properties of PWF reinforced shotcrete and determines the most ideal fitting results for mechanical properties and fiber fracture number through statistical analysis and correlation equation fitting.
COMPOSITE STRUCTURES
(2021)
Article
Construction & Building Technology
Han Bing, Huang Yuan
Summary: This study investigated the relationship between the compressive strength of grout and the shapes and sizes of grout blocks in different codes and regulations. The results showed that the compressive strength of grout increased with the increase of block sizes, which was different from concrete. Formulas proposed in this study can determine the compressive strength between test blocks with multiple shapes and sizes and calculate material properties of the grout.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Lu Jiang, Wei Lu, Wenjing Wang, Yu Zhang, Qiangqiang Han, Zhu Li
Summary: This paper investigates the physical and mechanical properties of self-healing concrete based on Microbial-induced carbonate precipitation (MICP), focusing on the effects of different mixing methods and self-healing agent (SHA) particle size. The results indicate that the compressive strength and splitting tensile strength of concrete gradually decrease with the increasing amount of the SHA. The splitting tensile strength decreases slightly compared with the compressive strength of self-healing concrete. However, the frost resistance of concrete increases firstly and then decreases with the increase of SHA content.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Xudong Chen, Jin Wu, Yingjie Ning, Wei Zhang
Summary: With the increasing demand for concrete, the production process causes environmental pollution and resource shortage. This study explores the use of concrete wastewater and waste slurry for concrete production and investigates their effects on mechanical properties and internal structure. The results show that wastewater concrete has better compressive properties and waste slurry can reduce production costs.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Chemistry, Physical
Maximilian Meurer, Martin Classen
Summary: This study investigates the mechanical properties of 3D printed concrete and mortar, proposes a set of easy-to-use experimental methods, and reveals the anisotropic material behavior under different loading conditions. It also confirms that the interval time between deposition of subsequent layers has a crucial effect on material properties.
Article
Construction & Building Technology
Samanta Robuschi, Karin Lundgren, Ignasi Fernandez, Mathias Flansbjer
MATERIALS AND STRUCTURES
(2020)
Article
Engineering, Civil
Samanta Robuschi, Jakob Sumearll, Ignasi Fernandez, Karin Lundgren
Summary: This study found that corrosion has an impact on the bond strength between concrete and plain reinforcement bars, with the casting position of the reinforcing bars and the presence of stirrups influencing the bond strength.
STRUCTURE AND INFRASTRUCTURE ENGINEERING
(2021)
Article
Engineering, Civil
Mattias Blomfors, Karin Lundgren, Kamyab Zandi
Summary: Transportation infrastructure, especially ageing reinforced concrete bridges, must be regularly assessed for safety and serviceability due to corrosion and cracks. This study investigates the effects of pre-existing anchorage zone corrosion cracks on reinforced concrete beam structural behavior through finite element modeling. Three methods of accounting for cracks were applied, with modifications to bond stress-slip relation showing accurate predictions for ultimate capacity in certain reinforcement scenarios. Visual measurements were found to be sufficient for estimating the bridge's capacity without exact knowledge of corrosion level.
STRUCTURE AND INFRASTRUCTURE ENGINEERING
(2021)
Article
Construction & Building Technology
Nele Pollmann, Fredrik Larsson, Kenneth Runesson, Karin Lundgren, Kamyab Zandi, Ralf Janicke
Summary: A computational homogenization technique is introduced to model diffusion in concrete, emphasizing the influence of aggregate content and variability. The study shows that the Interfacial Transition Zone (ITZ) has a significant impact on the effective properties.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Correction
Engineering, Civil
E. Chen, Carlos G. Berrocal, Ignasi Fernandez, Ingemar Lofgren, Karin Lundgren
ENGINEERING STRUCTURES
(2021)
Article
Engineering, Civil
Mattias Blomfors, Carlos G. Berrocal, Karin Lundgren, Kamyab Zandi
Summary: Cracking in reinforced concrete structures can affect ductility and structural capacity, highlighting the need for improved assessment methods. The study found that using weakened elements was more effective in capturing failure characteristics and capacity compared to the discrete-crack approach.
ENGINEERING STRUCTURES
(2021)
Article
Engineering, Civil
E. Chen, Carlos G. Berrocal, Ingemar Lofgren, Karin Lundgren
Summary: This paper investigates the use of hybrid reinforced concrete edge beams as a durable solution for corrosion damage. The service life of different beam alternatives was compared using chloride diffusion calculations and a corrosion-induced cracking model. The results show that using hybrid reinforced concrete can significantly prolong the service life of edge beams, leading to reduced life-cycle costs and greenhouse gas emissions.
STRUCTURE AND INFRASTRUCTURE ENGINEERING
(2023)
Article
Construction & Building Technology
Samanta Robuschi, Alessandro Tengattini, Jelke Dijkstra, Ignasi Fernandez, Karin Lundgren
Summary: This study utilized a state-of-the-art non-destructive 3D method, including multimodal neutron and X-ray tomography, to observe the characteristics of corrosion products in two concrete samples. The research aimed to investigate the potential benefits of this technique for reinforced concrete structures, providing quantitative and qualitative data on the corrosion process.
CEMENT AND CONCRETE RESEARCH
(2021)
Article
Construction & Building Technology
Jincheng Yang, Reza Haghani, Thomas Blanksvard, Karin Lundgren
Summary: This study investigated the feasibility of using externally bonded FRP laminates combined with U-jackets to strengthen beams with corroded reinforcement without repairing the deteriorated concrete cover. The experimental results showed that despite severe corrosion, this strengthening method was effective in upgrading the load-carrying capacity and flexural stiffness of the beams.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Engineering, Civil
Xiaotong Yu, Samanta Robuschi, Ignasi Fernandez, Karin Lundgren
Summary: Corrosion has a significant impact on the bond between reinforcing bars and surrounding concrete in Reinforced Concrete (RC) heritage structures. Non-linear finite element analysis (NLFEA) and experimental tests were conducted to study the bond behavior and corrosion effects, showing good agreement between numerical and experimental results. Loss of bond at yielding and yield penetration asymmetry are crucial factors for accurately describing structural behavior.
ENGINEERING STRUCTURES
(2021)
Article
Engineering, Civil
Milan Gotame, Carl Lindqvist Franklin, Mattias Blomfors, Jincheng Yang, Karin Lundgren
Summary: This paper investigates the flexural behavior of corrosion-damaged reinforced concrete beams strengthened with externally bonded FRP using non-linear finite element analysis. The study found that the modeling of pitting corrosion location, lengths, and number of pits has a significant influence on predicting the load and deformation capacity of beams. Different strengthening methods were effective for different beam geometries and corrosion damages.
ENGINEERING STRUCTURES
(2022)
Article
Engineering, Civil
Emil Aggestam, Jens C. O. Nielsen, Karin Lundgren, Kamyab Zandi, Anders Ekberg
Summary: This paper focuses on optimizing the dimensions and concrete types of slab tracks in order to minimize greenhouse gas emissions, while meeting the static dimensioning analysis requirement of the European standard. Using a 3D model, the dynamic vehicle-track interaction is analyzed, and contact forces and stress fields are calculated. The study concludes that the panel thickness can be reduced without risking crack initiation, and also develops a reinforced concrete model to predict crack widths and assess when steel reinforcement can be reduced.
ENGINEERING STRUCTURES
(2022)
Article
Construction & Building Technology
Adam Sciegaj, Fredrik Larsson, Karin Lundgren
Summary: This study developed an effective and robust method to consider the interfilament slip in textile reinforcement yarns and the slip between the yarns and concrete. Pull-out tests were carried out to determine the efficiency factors for strength and stiffness, which were found to be very similar.
CEMENT & CONCRETE COMPOSITES
(2022)
Article
Construction & Building Technology
Samanta Robuschi, Oskar Larsson Ivanov, Mette Geiker, Ignasi Fernandez, Karin Lundgren
Summary: This study compiled data on corroded cracked concrete specimens in chloride environments, including detailed information such as crack and pit locations, local corrosion pattern, etc. Five hypotheses on the influence of transversal cracks on corrosion damage were tested using statistical methods. The results indicated that transversal cracks were good indicators of the position of corrosion pits and the corrosion rate of the pit increased in proximity of a crack. However, no clear correlation between surface crack width and corrosion damage was found.
MATERIALS AND STRUCTURES
(2023)
Article
Construction & Building Technology
Qi Zheng, Chengyao Liang, Jinyang Jiang, Haiyan Mao, Karen C. Bustillo, Chengyu Song, Jeffrey A. Reimer, Paulo J. M. Monteiro, Haimei Zheng, Shaofan Li
Summary: This study used scanning transmission electron microscopy to examine defects in cement particles at the single-atom level. The researchers identified different types of defects and found that they play a crucial role in cement hydration, facilitating dissolution and providing nucleation sites for hydration products.
CEMENT AND CONCRETE RESEARCH
(2024)
Article
Construction & Building Technology
Anuj Parashar, Shashank Bishnoi
Summary: This study investigated the hydration of siliceous fly ash, slag, and metakaolin with calcium hydroxide, and found that the rate of hydration and phase assemblage is influenced by the alkali and sulphate content, while siliceous fly ash is less affected by alkalis and sulphates.
CEMENT AND CONCRETE RESEARCH
(2024)
Article
Construction & Building Technology
Peimin Zhan, Juan Wang, Hanbing Zhao, Wengui Li, Surendra P. Shah, Jing Xu
Summary: This study investigates the influence of hydrothermal synthetic conditions on the properties of C-S-H seeds and reveals the correlations between C-S-H seeds properties, hydration kinetics, and paste performances. It is found that low reactant concentrations and calcium-to-silicon ratios facilitate the production of C-S-H seeds with small size and high purity. Using C-S-H seeds with high effective surface area accelerates the hydration process of cement, resulting in refined pore structure and enhanced strength.
CEMENT AND CONCRETE RESEARCH
(2024)
Article
Construction & Building Technology
Zhaozheng Meng, Qing-feng Liu, Neven Ukrainczyk, Song Mu, Yufei Zhang, Geert De Schutter
Summary: This study developed a numerical framework to investigate the combined attack of sulfate and chloride ions on cementitious materials in marine and saline environments. The study quantified various chemical reactions and solved the electrostatic potential caused by multi-ion coupling. The results showed that neglecting the multi-ions coupling effect could result in an underestimated chemical coupling strength in competitive chloride-sulfate binding.
CEMENT AND CONCRETE RESEARCH
(2024)
Article
Construction & Building Technology
Ning Li, Cise Unluer
Summary: This study aimed to improve the carbonation efficiency and reduce processing time of recycled concrete aggregates (RCAs). Wet carbonation with seawater was found to be more efficient than dry carbonation, leading to significant reduction in water absorption and increase in density of RCAs. The compressive strength of recycled aggregate concrete (RAC) prepared with 1-hour seawater carbonated RCAs was also improved. The formation of ettringite and calcite under wet carbonation contributed to the increased density and strength, as well as improved bond strength in the interfacial transition zone of RAC. Seawater presents several advantages as a medium for wet carbonation, including its abundant availability, CO2 capture capacity, and accelerated hydration and carbonation.
CEMENT AND CONCRETE RESEARCH
(2024)
Article
Construction & Building Technology
Yong Tao, Yining Gao, Yanjie Sun, Roland J. -M. Pellenq, Chi Sun Poon
Summary: Decalcification of calcium silicate hydrates (C-S-H) is an important issue for the long-term safety of cement-based infrastructures. Using molecular simulations, this study reveals an important mechanism of accelerated C-S-H decalcification in seawater, which involves ion exchange between surface Ca and electrical double layers, resulting in a decrease in Ca dissolution free energy. This finding enhances the understanding and prediction of cementitious materials' degradation.
CEMENT AND CONCRETE RESEARCH
(2024)
Article
Construction & Building Technology
Kumaran Coopamootoo, Enrico Masoero
Summary: This study uses kinetic simulations to investigate the relationship between dissolution rate and saturation index in minerals in solution. Two distinct regimes are observed, with stresses at crystallographic defects controlling the transition between them. A parameterization of the interaction potentials is proposed to obtain consistent interfacial energies with water. The findings contribute to the current discussion on controlling reactivity using materials and defects.
CEMENT AND CONCRETE RESEARCH
(2024)
Article
Construction & Building Technology
Faping Li, Qianshi Chen, Yiyan Lu, Yunlong Zou, Shan Li
Summary: In this study, the impact of functionalized multi-walled carbon nanotubes and a silane coupling agent on the performance and microstructure of alkali-activated fly ash/slag pastes was investigated. The results showed that the addition of these materials can prolong setting time, improve flowability and mechanical strength, and reduce mass loss and drying shrinkage.
CEMENT AND CONCRETE RESEARCH
(2024)
Article
Construction & Building Technology
Yaozeng Wang, Wencui Yang, Ai Zhang, Penghuan Liu, Yong Ge
Summary: Low-temperature low-field nuclear magnetic resonance was used to analyze icing in water saturated white cement paste specimens during the freeze-thaw process at different temperatures. The experimental results were compared with classical theory, showing agreement at certain temperatures but discrepancies at others. New equations were proposed based on the analysis of specimens saturated with different solutions to relate the volume of frozen water to temperature during freezing and thawing of cementitious materials.
CEMENT AND CONCRETE RESEARCH
(2024)
Article
Construction & Building Technology
Shengjie Yan, Yingjie Liang
Summary: This paper proposes a fractal derivative model with a non-linear distributed-order (DOFM) to describe the multi-scaling behaviors of particle diffusion in alkali-activated materials. The DOFM is tested using experimental data and is found to effectively describe the multi-scaling diffusion behaviors of particles in the materials.
CEMENT AND CONCRETE RESEARCH
(2024)
Article
Construction & Building Technology
Cecilia Pesce, Richard J. Ball, Marco Molinari, Shaun Reeksting, Giovanni Luca Pesce
Summary: This study evaluates the effect of ten organic additives on the microstructure of portlandite crystals during CaO hydration. It was found that the presence of carbohydrates and sulfonates can alter the structure of portlandite and the properties of lime can be controlled by adding carbohydrates. This has significant implications for the development of new binders and reducing CO2 emissions.
CEMENT AND CONCRETE RESEARCH
(2024)
Article
Construction & Building Technology
Daniel Jansen, Alexander German, Dominique Ectors, Frank Winnefeld
Summary: This study used X-ray diffraction and Rietveld refinement technique to investigate a hydrous carbonate-containing brucite and found that the 001 reflection of this phase split into different patterns at different temperatures. The presence of water and/or carbonate influenced the distance between the layers in the brucite structure.
CEMENT AND CONCRETE RESEARCH
(2024)
Article
Construction & Building Technology
Dylan Singh, Trinh Thao My Nguyen, Evann Bustamantes, Abdul Wahab, Ahmad Hamzah Yousaf, Ian Shortt, Frank W. Foss Jr, Maria Konsta-Gdoutos, Sang Soo Lee, Erika La Plante
Summary: This study analyzes the chemical structure and morphology of magnesium silicate hydrate (MSH) grown under different concentration ratios and temperatures. The results show that increasing the magnesium to silicon ratio reduces silicate polymerization in MSH, and at higher temperatures and longer reaction times, oriented attachment of nanoparticles and enhanced crystallinity are observed. These findings provide insights into the precise chemical synthesis of MSH and its widespread use as a binder in construction.
CEMENT AND CONCRETE RESEARCH
(2024)
Article
Construction & Building Technology
J. C. O. Zepper, S. R. van der Laan, K. Schollbach, H. J. H. Brouwers
Summary: This study presents a method to calculate the main phases of BOF slag based on chemical composition and validates the proposed final model through quantitative model assessment and validation approaches.
CEMENT AND CONCRETE RESEARCH
(2024)
Article
Construction & Building Technology
Yierfan Maierdan, Samuel J. Armistead, Rebecca A. Mikofsky, Qiqi Huang, Lola Ben-Alon, Wil V. Srubar III, Shiho Kawashima
Summary: This research investigated the effects of sodium alginate on the stability and 3D printability of kaolinite suspensions. The findings showed that sodium alginate could enhance the stability of kaolinite and improve the strength of printable mixtures, as well as shift the printability window.
CEMENT AND CONCRETE RESEARCH
(2024)
