Article
Construction & Building Technology
Guanghao Mai, Lijuan Li, Jiawei Lin, Wei Wei, Shaohua He, Ruikeng Zhong, Zhe Xiong
Summary: This paper investigates the bond durability between basalt fiber reinforced polymer (BFRP) bars and recycled aggregate seawater sea-sand concrete (RASSC) in freezing-thawing environment through eccentric pull-out tests. The bond strength between BFRP bars and RASSC decreases significantly with increasing freezing-thawing cyclic numbers, while it increases with concrete cover thicknesses. Equations for relative compressive strength and relative dynamic elastic modulus of RASSC considering the effect of freezing-thawing cyclic numbers are established. Equations for bond strength, slip at bond strength, and bond stiffness between BFRP bars and RASSC considering the effects of freezing-thawing cyclic numbers and concrete cover thicknesses are provided. The mBPE model and CMR model are also calibrated.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Construction & Building Technology
Chen Chen, Kai Zhang, Zhigang Yin, Jing Zhou
Summary: The performance of recycled aggregate pervious concrete (RAPC) in severe cold regions was studied. The influence of water-binder ratio, design porosity, micro silica fume, and enhancer agent on permeability and mechanical properties of RAPC was evaluated. Freeze-thaw experiments were conducted to investigate the effect of different media on mechanical properties, permeability, and anti-frost durability of RAPC. Damage evolution models of RAPC under different freeze-thaw media were established.
Article
Construction & Building Technology
Lassana Bakary Traore, Claudiane Ouellet-Plamondon, Antonin Fabbri, Fionn McGregor, Fabrice Rojat
Summary: The study focuses on the frost resistance of earthen buildings in wet and cold regions. Experimental results show that surface scaling is a major factor affecting all samples, while cement stabilization can enhance the frost resistance of earthen buildings. Different freezing-thawing cycles were conducted to analyze water absorption and frost resistance at early stages, providing insights for developing a more suitable testing method for the freezing-thawing resistance of earthen building materials.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Keikhosrow Tahmureszadeh, Medhat H. Shehata, Bill Gong
Summary: In this study, the durability and bond strength of three repair materials were investigated under two different exposures. The results showed that the efficacy of a repair cannot solely be explained based on the net unrestrained length change, but is also influenced by factors such as autogenous shrinkage, strength, and paste content.
ACI MATERIALS JOURNAL
(2022)
Article
Multidisciplinary Sciences
Martina Ahlberg, Sunjae Chung, Sheng Jiang, Andreas Frisk, Maha Khademi, Roman Khymyn, Ahmad A. Awad, Q. Tuan Le, Hamid Mazraati, Majid Mohseni, Markus Weigand, Iuliia Bykova, Felix Gross, Eberhard Goering, Gisela Schutz, Joachim Grafe, Johan Akerman
Summary: Magnetic droplets can be frozen into static nanobubbles by decreasing the applied magnetic field.
NATURE COMMUNICATIONS
(2022)
Article
Engineering, Environmental
Guanghua Cai, Songyu Liu, Xu Zheng, Haifeng Zou, Guanghui Shao, Jiangshan Li
Summary: The F-T durability of reactive MgO-admixed silty clay subjected to forced carbonation was studied through physical and mechanical tests, showing fluctuating weight change rates but stable water content and density. The strengths of MgO-carbonated specimens decreased after 2-8 F-T cycles, but were still higher than those of PC-solidified specimens. The F-T cycles had little impact on the carbonation products and crystalline morphologies, but led to changes in pore volumes and distribution.
COLD REGIONS SCIENCE AND TECHNOLOGY
(2021)
Article
Environmental Sciences
Chunyu Tang, Kui Cheng, Bailiang Liu, Markus Antonietti, Fan Yang
Summary: The combination of liquid artificial humic acid (LA-HA) and freezing-thawing events can enhance carbon sequestration in soils and promote the formation of high fertility black soil. LA-HA applications increase persistent carbon reservoirs and accelerate the formation of resistant carbon. Additionally, LA-HA optimizes the community structure of carbon sequestration bacteria and reduces soil carbon loss after thawing.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Materials Science, Multidisciplinary
Alexander Haynack, Jithender J. Timothy, Thomas Kraenkel, Christoph Gehlen
Summary: Surface deterioration of concrete due to freezing and thawing in cold climates and deicing salts is crucial for its durability. The resistance of cementitious materials to freeze-thaw deicing salt can be determined through the capillary suction of de-icing chemicals and freeze-thaw (CDF) test. However, this test may underestimate the actual freeze-thaw resistance due to increased edge scaling in specimens with unknown performance. In materials research, studying concretes with high levels of surface deterioration can provide valuable information about factors influencing freeze-thaw resistance. A new methodology that utilizes high-resolution 3D scan data is presented in this article to analyze surface deterioration of CDF samples.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Chemistry, Physical
Junzheng Xiang, Hengrui Liu, Hao Lu, Faliang Gui
Summary: The research found that under freezing and thawing conditions, the quality, strength, and dynamic modulus of elasticity of pervious concrete deteriorate to different degrees. The damage caused by freeze-thaw is greater on strength than on dynamic modulus or quality, and the deterioration of pervious concrete performance is closely related to the deterioration of the interface strength between aggregates and hardened paste.
Article
Construction & Building Technology
Ruifeng Xie, Linjun Lu, Pizhong Qiao, Zhidong Zhou
Summary: This study characterizes the micromechanical properties of ultra-high-performance concrete (UHPC) under different freezing-thawing cycles using nanoindentation technique. The results show that the indentation moduli of different components in UHPC decrease moderately with increasing freezing-thawing cycles. The interfacial transition zone (ITZ) between steel fiber and cement paste is identified as the weakest zone, with its thickness increasing after freezing-thawing cycles.
MAGAZINE OF CONCRETE RESEARCH
(2022)
Article
Construction & Building Technology
Asim Rifa, Sk M. Subhani, A. Bahurudeen, Kumar Gedela Santhosh
Summary: This study comprehensively compares the performance of recycled fine aggregate concrete with other alternative fine aggregates. The results show that recycled concrete fine aggregate can meet the requirements within a certain range.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Construction & Building Technology
L. Levin, I Golovatyi, A. Zaitsev, A. Pugin, M. Semin
Summary: This paper presents a case study of thermal monitoring of frozen wall thawing during shaft sinking at the Petrikov Potash Mine in Belarus, which involved developing an original optical fibre sensor for distributed temperature measurements. Real-time DTS monitoring combined with numerical simulation offers considerable possibilities for controlling and optimizing mining operations.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2021)
Article
Construction & Building Technology
Seyed Amin Azimi, Ali Allahverdi, Mehdi Alibabaie
Summary: This work focuses on the development of green lightweight reactive powder concrete (GLRPC) by incorporating modified expanded polystyrene beads (MEPS) to improve its mechanical properties. High-strength lightweight concrete can be achieved by replacing up to 30% of the RPC paste volume with MEPS beads, while higher replacement levels result in a drop to structural grade. Water absorption is more strongly related to curing temperature than replacement level of RPC paste volume with MEPS.
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2021)
Article
Construction & Building Technology
Bin Zhang, Waqas Ahmad, Ayaz Ahmad, Fahid Aslam, Panuwat Joyklad
Summary: The research on recycled aggregate concrete is growing, but there is an information overload that may hinder effective research and collaboration. This study used scientometric analysis to analyze the literature on recycled aggregate concrete and identified improvement techniques to enhance its performance.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Construction & Building Technology
Haider M. Al-Baghdadi
Summary: The study investigates the impact of sulfate environment on the mechanical properties of pretreated RCA concrete using a PVA agent. The use of 32% RCA in the concrete mix exhibited the best durability, while higher strength was observed in mixes with RCA pre-soaked in PVA. Increasing the amount of RCA pre-soaked in PVA led to increased hydration and decreased internal voids, impacting the absorption rates under different curing conditions.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2021)
Article
Construction & Building Technology
Diego J. De Souza, Leandro F. M. Sanchez, Juarez Hoppe Filho, Marcelo H. F. Medeiros
Summary: This paper evaluates the physical and chemical properties of mortar mixtures with different binders and exposed to different sulphate solutions. A theoretical approach to describe the susceptibility of cementitious mixtures against sulphate attack is proposed. The results show that the amount of portlandite and the potential of ettringite formation are well correlated with the expansion and damage caused by sulphate attack.
CEMENT & CONCRETE COMPOSITES
(2024)
Article
Construction & Building Technology
Yu Chen, Hossein Rahmani, Erik Schlangen, Og uzhan Copurog
Summary: This study presents a method to accelerate the production of limestone-calcined clay-based cementitious materials using Ca(NO3)2 solution in 3D printing, and investigates the effects of adding Ca(NO3)2 solution on the material's properties. The results show that adding Ca(NO3)2 solution can improve buildability, accelerate initial setting, and increase compressive strength.
CEMENT & CONCRETE COMPOSITES
(2024)
Article
Construction & Building Technology
Jing Xu, Xianzhi Wang, Wu Yao, Qing Chen, Hehua Zhu, Surendra P. Shah
Summary: Concrete cracks in marine engineering are caused by the hostile seawater environment, leading to serious deterioration of infrastructures. Microbial induced carbonate precipitation (MICP) is an effective and environmentally friendly approach for self-healing of concrete cracks. However, the formation and structure of MICP products for crack healing in seawater are still unclear, which hinders the application of MICP in marine structures.
CEMENT & CONCRETE COMPOSITES
(2024)
Article
Construction & Building Technology
Zhenbo Wang, Peng Sun, Yurun Fan, Yudong Han, Yudong Hu
Summary: This study investigates the potential use of engineered cementitious composites (ECCs) with strain-hardening and self-healing characteristics as a cover material in wet coral sand exposure. The results show that ECCs can effectively close cracks, reduce water permeability, and restore the load-carrying capacity of structures. Additionally, lower strain levels are associated with decreased rebar corrosion.
CEMENT & CONCRETE COMPOSITES
(2024)
Article
Construction & Building Technology
Zhengxian Yang, Xiaoli Xiong, Kang Li, Bruno Briseghella, Giuseppe Carlo Marano, Shanghong Chen
Summary: This study investigates the long-term volume stability and strength development of engineered cementitious composites (ECC) containing high-volume steel slag (SS). It is found that the strength of ECC with SS starts to decline after 90 days, while the decline is more significant compared to the matrix. The expansion of SS reduces the fracture toughness of the matrix, leading to an increase in toughness and ductility of the ECC. The introduction of ground granulated blast furnace slag (GGBFS) and PVA fibers can reduce the volume expansion and strength loss caused by SS expansion.
CEMENT & CONCRETE COMPOSITES
(2024)
Article
Construction & Building Technology
Bin Xi, Zhewen Huang, Salam Al-Obaidi, Liberato Ferrara
Summary: This study investigates the self-healing capabilities of Ultra-High Performance Concrete (UHPC) under the combined influence of mechanical and environmental factors. The results reveal that UHPC with narrow cracks exhibits a higher degree of self-healing, especially when exposed to tap water. Furthermore, prolonged exposure mitigates the inhibitory effect of aggressive ions on self-healing.
CEMENT & CONCRETE COMPOSITES
(2024)
Article
Construction & Building Technology
Zhichao Xu, Huayang Sun, Yanlin Huo, Minjie Jia, Zhitao Chen, Yingzi Yang
Summary: In this study, MXene was used to modify the surface of polyethylene fiber, improving the interfacial properties and tensile properties of strain hardening cementitious composites. The MXene-coated fiber showed increased tensile stress and strain, reduced crack width and spacing, and enhanced frictional bond strength between the fiber and matrix.
CEMENT & CONCRETE COMPOSITES
(2024)
Article
Construction & Building Technology
Bao Lu, Yeqiang Zhou, Lei Jiang, Zhensen Liu, Guihua Hou
Summary: This study investigated the leaching rate of Ca2+ from magnesium slag (MS) and developed a leaching-carbonation method to convert MS into high-purity vaterite and supplementary cementitious materials. The wet carbonation process with glycine as a crystal modifier successfully produced spherical vaterite with high purity and surface area. The leachate solid residue (LSR) obtained from the leaching process of MS showed a smaller size destruction and higher surface area compared to Portland cement, leading to accelerated hydration process and improved compressive strength and pore structure development. This work provides a novel treatment method for MS and enables its high value-added utilization.
CEMENT & CONCRETE COMPOSITES
(2024)
Article
Construction & Building Technology
Gustavo Henrique Nalon, Jose Carlos Lopes Ribeiro, Leonardo Goncalves Pedroti, Roberto Marcio da Silva, Eduardo Nery Duarte de Araujo, Gustavo Emilio Soares de Lima
Summary: The mechanical behavior of mortar joints is crucial for masonry's structural performance. This study investigated the effects of different lime/cement ratios and carbon black nanoparticles content on the properties of mortars. The results showed that increasing lime content decreased mortar strength but increased self-sensing properties at the end of the percolation zone.
CEMENT & CONCRETE COMPOSITES
(2024)
Article
Construction & Building Technology
Yifei Wang, Lei Lei, Caijun Shi
Summary: The effects of DEIPA and EDIPA at dosages of 0.02% and 0.05% on the hydration and strength development of cement-fly ash-limestone ternary blend were investigated. It was found that both dosages of DEIPA and EDIPA promote the chemical effect of limestone and the hydration of aluminates from cement and fly ash. The hydration of silicates was accelerated by 0.02% of DEIPA or EDIPA but delayed by 0.05% due to excessive aluminates hydration. DEIPA and EDIPA also refine the pore structure and increase compressive strength of the blend mortar.
CEMENT & CONCRETE COMPOSITES
(2024)
Article
Construction & Building Technology
Du Pan, Ditao Niu, Zongjin Li
Summary: A thick-walled cylinder model was developed in this study to analyze the cracking behavior of seawater sea-sand concrete (SSC) cover. Damage variables were introduced to determine the extent of damage for each cracked ring, and a predictive model for the cracking time of SSC cover was established. The accuracy of the model was verified using the Digital Image Correlation (DIC) technique.
CEMENT & CONCRETE COMPOSITES
(2024)
Article
Construction & Building Technology
Jiangyu Wu, Hong S. Wong, Hao Zhang, Qian Yin, Hongwen Jing, Dan Ma
Summary: This study explores a method of strengthening cemented rockfill by using well-graded gangue and partially replacing Portland cement with fly ash and a premixed low-alkalinity activator. The research investigated the effects of activator dosage and curing time on the mechanical properties, composition, and microstructure of cemented rockfill. Results show improved performance with low cement content and the use of a low-cost activator. The addition of premixed activator to fly ash enhanced the formation of specific minerals and caused densification of the microstructure. The study reveals an effective and low-cost method for recycling mining wastes and reducing cement.
CEMENT & CONCRETE COMPOSITES
(2024)
Article
Construction & Building Technology
Juntao Dang, Xiaosong Tang, Jianzhuang Xiao, Aihong Han
Summary: This study proposes a solution to improve the fresh stability and thermal insulation of alkali-activated foamed concrete by adding recycled brick powder. The study investigates the effects of activator modulus and Na2O concentration on the properties of alkali-activated foamed concrete with different bases. The presence of alkaline activator negatively affects the foamability and foam stability, but adjusting the activator concentration can achieve shorter initial setting time and higher fluidity loss. In addition, the increased activator concentration resulted in changes in the pore structure of the foamed concrete.
CEMENT & CONCRETE COMPOSITES
(2024)
Article
Construction & Building Technology
Jiandong Zuo, Bo Wu, Biqin Dong, Feng Xing, Jun Ma, Guanqi Wei
Summary: Nitrite ion intercalated Ca-Al and Mg-Al layered double hydroxides (LDHs) were successfully synthesized using two modified methods. The Ca-Al LDH synthesized by hydrothermal method (H-C-LDH) exhibited the best properties. The intercalated LDHs improved the mechanical properties, chloride penetration resistance, and permeability resistance of cement mortars without affecting the fluidity. Additionally, the intercalated LDHs provided better corrosion resistance.
CEMENT & CONCRETE COMPOSITES
(2024)
Review
Construction & Building Technology
Jingbin Yang, Zhenping Sun, Nele De Belie, Didier Snoeck
Summary: This review paper provides an overview of internal curing mechanism, common internal curing agents, and the most promising agent-superabsorbent polymers in alkali-activated materials (AAM) systems. The introduction of voids by internal curing agents typically has a negative impact on mechanical properties, but continuous water release during internal curing counteracts this effect by promoting hydration. While the effect of internal curing in reducing autogenous shrinkage of AAM systems has been well-established, the impact on drying shrinkage varies widely in different studies.
CEMENT & CONCRETE COMPOSITES
(2024)