Article
Construction & Building Technology
Antonino Runci, John Provis, Marijana Serdar
Summary: This study evaluates the influence of microstructural properties on the chloride diffusion resistance of alkali-activated materials (AAMs) based on blast furnace slag and/or fly ash. The addition of slag to AAMs reduces porosity and chloride permeability. The results show that chloride penetration decreases with increasing Na2O%, but the changes in porosity and pore structure do not follow the same trend. Furthermore, the experimental results indicate that physical chloride adsorption predominates over chemical chloride binding on the gel surfaces of AAMs.
CEMENT & CONCRETE COMPOSITES
(2022)
Article
Green & Sustainable Science & Technology
Hamid Reza Razeghi, Pooria Ghadir, Akbar A. Javadi
Summary: Saline soils are known as problematic soils worldwide due to their inappropriate geotechnical properties. This study investigates the microstructural and mechanical properties of alkali-activated volcanic ash/slag-stabilized sandy soil in the presence of NaCl. The results show that alkali-activated slag can be a sustainable alternative to Portland cement for soil stabilization projects in saline environments. Microstructural analyses reveal the formation of gels that reduce porosity and increase mechanical strength in samples containing slag and volcanic ash.
Review
Chemistry, Physical
Xiaomei Wan, Yunzheng Cui, Zuquan Jin, Liyan Gao
Summary: Chloride transport is a crucial aspect in the investigation of alkali-activated materials (AAMs) durability. However, the extensive types, complex mix proportions, and limitations in testing techniques result in numerous and diverse research reports. Thus, this study comprehensively reviews the chloride transport behavior and mechanism, solidification of chloride, factors influencing chloride transport, and testing methods of AAMs, providing informative insights for future research on the chloride transport issue of AAMs.
Review
Construction & Building Technology
Walid Tahri, Xiang Hu, Caijun Shi, Zuhua Zhang
Summary: This paper reviews recent studies on the steel corrosion behavior of alkali-activated concretes (AACs) and highlights the transport of chloride and chloride binding in AACs. The purpose is to demonstrate the steel corrosion resistance of AACs in comparison to Portland cement concrete, discussing their advantages and disadvantages.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Geochemistry & Geophysics
Yibing Zuo
Summary: Thermodynamic modelling was used to investigate the effect of chloride salt on the phase evolution in alkali-activated slag paste. The results show that the valence of cation in chloride salt and slag chemistry significantly affect the phase assemblage, pore solution composition, and chemical chloride binding capacity of the paste.
APPLIED GEOCHEMISTRY
(2022)
Review
Construction & Building Technology
Jingxiao Zhang, Yuwei Ma, Jie Hu, Hao Wang, Zuhua Zhang
Summary: This review systematically reviews the existing knowledge about chloride transport in alkali-activated materials (AAMs). It discusses the chloride transport mechanisms, influencing parameters, and testing methods in AAMs. Additionally, it explores the effects of different precursors, activators, and admixtures on the properties of AAMs and the feasibility of replacing ordinary Portland cement (OPC) with AAMs. Finally, it suggests the limitations of current research and proposes future research directions.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Yaguang Zhu, Xiaomei Wan, Xiao Han, Jie Ren, Juqian Luo, Qi Yu
Summary: This study experimentally investigates the influencing factors of the chloride solidification capacity of alkali-activated slag, including temperature, pH value, and activator type. The results show that the binder capacity of slag activated by water glass is greater than that of slag activated by NaOH, and the physical adsorption in the solidification of chloride accounts for more than 50% for all three pastes.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Richard Caron, Ravi A. Patel, Frank Dehn
Summary: A new model for reaction kinetics of waterglass-activated slag cements has been proposed, which successfully describes the different mechanisms during alkali-activation of slag with waterglass. The model has been tested against experimental and literature data, showing good fit and correlation with mix characteristics. The study provides insights into the factors influencing the kinetics of the process.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Qing-feng Liu, Yuxin Cai, Hui Peng, Zhaozheng Meng, Shishir Mundra, Arnaud Castel
Summary: In this study, a multi-phase, multi-component ionic numerical model is developed to investigate the chloride transport in alkali-activated fly ash/slag (AAFS) concretes. The results indicate that the slag content and the water to binder ratio are the dominant factors affecting chloride penetration and corrosion initiation time of steel bars in AAFS concretes.
CEMENT AND CONCRETE RESEARCH
(2023)
Article
Chemistry, Physical
Kamasani Chiranjeevi Reddy, Joonho Seo, H. N. Yoon, Seonhyeok Kim, G. M. Kim, H. M. Son, Seunghee Park, Solmoi Park
Summary: The phase changes in alkali-activated slag samples under supercritical carbonation were investigated. The results showed the formation of C-S-H as the main reaction product, along with other minor reaction products. X-ray diffractograms revealed the complete decalcification of C-S-H and the formation of various CaCO3 polymorphs. Si-29 and Al-27 NMR spectroscopy confirmed the formation of highly cross-linked aluminosilicate gel and a reduction in unreacted slag content.
Article
Construction & Building Technology
Xiaobo Wang, Lijuan Kong, Wenjing Zhao, Yazhou Liu
Summary: The chloride transportation in alkali-activated fly ash (AAFA), alkali-activated slag (AAS) and alkali-activated fly ash/slag (AAFS) concrete under different environmental exposures was investigated. The results showed that AAFA had the highest initial chloride transport, but decreased over time. The deterioration of AAFA and AAFS specimens was caused by chloride and sulfate salt crystallization and carbonation. On the other hand, AAS specimens showed little change in appearance but experienced decalcification and deterioration of pore structure due to carbonation. The AAFS specimens had the best long-term performance due to the formation of gels with higher cross-linking and polymerization.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Chemistry, Physical
Brant Walkley, Xinyuan Ke, John L. Provis, Susan A. Bernal
Summary: By using solid-state NMR spectroscopy, the effect of different activator types on the reaction products of aged alkali-activated slag cements was revealed. It was found that the anion type in the activator significantly influences the nanostructure and local hydration of the main binding phases in these cements.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Construction & Building Technology
Pedro Perez-Cortes, Karina Cabrera-Luna, J. Ivan Escalante-Garcia
Summary: Alkali-activated limestone/metakaolin pastes were exposed to different temperatures, with weight reduction at 300°C, reactions/dissolution at 600°C, and formation of new compounds at 900°C, leading to significant strength reduction. These findings provide insights into potential high-temperature applications of AAC-LSMK.
CEMENT & CONCRETE COMPOSITES
(2021)
Article
Construction & Building Technology
Juan Pablo Gevaudan, Zoey Craun, Wil V. Srubar
Summary: This study investigated the impact of alkali content and brucite mineral addition on the acid resistance of alkali-activated metakaolin. Results showed that higher alkali content and brucite addition improved the acid resistance of sodium-stabilized aluminosilicate hydrate framework, primarily through increased Mg+2 retention and Mg-Al interaction. Additionally, brucite addition reduced micro-scale porosity and increased gel pore proportion, indicating potential benefits for Mg+2 retention and Mg-Al coupling.
CEMENT & CONCRETE COMPOSITES
(2021)
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
Computer Science, Interdisciplinary Applications
Duzgun Agdas, David J. Warne, Jorge Osio-Norgaard, Forrest J. Masters
JOURNAL OF COMPUTING IN CIVIL ENGINEERING
(2018)
Article
Construction & Building Technology
Anastasia N. Aday, Jorge Osio-Norgaard, Kyle E. O. Foster, Wil V. Srubar
MATERIALS AND STRUCTURES
(2018)
Article
Construction & Building Technology
Juan Pablo Gevaudan, Alejandro Caicedo-Ramirez, Mark T. Hernandez, Wil V. Srubar
CEMENT AND CONCRETE RESEARCH
(2019)
Article
Construction & Building Technology
Juan Pablo Gevaudan, Zoey M. Craun, Wil V. Srubar
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2019)
Article
Chemistry, Physical
Jorge Osio-Norgaard, Wil V. Srubar
Article
Materials Science, Ceramics
Juan Pablo Gevaudan, Jaqueline D. Wallat, Bimala Lama, Wil V. Srubar
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2020)
Article
Nanoscience & Nanotechnology
Jamie F. Thompson, Charlotte Bellerjeau, Gabrielle Marinick, Jorge Osio-Norgaard, Arwyn Evans, Patricia Carry, Robert A. Street, Camille Petit, Gregory L. Whiting
ACS APPLIED MATERIALS & INTERFACES
(2019)
Review
Green & Sustainable Science & Technology
Reza Homayoonmehr, Ali Akbar Ramezanianpour, Faramarz Moodi, Amir Mohammad Ramezanianpour, Juan Pablo Gevaudan
Summary: This review discusses the effects of clay-based supplementary cementitious materials (SCMs) on physical and chemical chloride binding, with a focus on metakaolin. The results show that clay addition reduces the physical chloride-binding capacity but increases the chemical binding capacity. Furthermore, an optimum aluminum content range has been found to maximize the chemical binding of chlorides.
Article
Construction & Building Technology
Goncalo Duarte, Jose Pinto Duarte, Ali Memari, Nathan Brown, Juan Pablo Gevaudan
Summary: This paper provides a model for the structural performance of extruded cementitious materials in 3D concrete printing (3DCP) technologies. It emphasizes the connection between rheological and mechanical testing results in the fresh state, the relevance of post-fresh state behavior for 3DCP, and the impact of toolpath design on hardened state behavior. The results show that buildability for 3DCP depends on post-fresh state properties and is characterized by thixotropy, early structuration, setting, and hardening properties.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Materials Science, Ceramics
Juan Pablo Gevaudan, Yousra Timounay, Leonhard Mayrhofer, Mohammad Zarshenas, Michael Moseler
Summary: Service life predictions of reinforced concrete structures are affected by the formation of passive films at the steel-concrete interface of alkali- and salt-activated slag materials. The pore solution chemistry, such as pH, E-h, and chemical composition, can influence the formation of these passive films. Understanding the initial passivation reactions and the role of material design and pore solution chemistry is crucial for the corrosion durability of activated slag materials.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Engineering, Environmental
Austin C. Hayes, Jorge Osio-Norgaard, Shelly Miller, Marina E. Vance, Gregory L. Whiting
Summary: The study characterizes airborne powder emissions for powders of different particle diameters and compositions, highlighting the importance of considering environmental factors in the design of 3D printing, particularly focusing on air quality and particulate concentrations on the Moon.
ACS ES&T ENGINEERING
(2021)
Article
Chemistry, Multidisciplinary
Shane D. Frazier, Mohammad G. Matar, Jorge Osio-Norgaard, Anastasia N. Aday, Elizabeth A. Delesky, Wil V. Srubar
CELL REPORTS PHYSICAL SCIENCE
(2020)
Proceedings Paper
Construction & Building Technology
Juan Pablo Gevaudan, Wil V. Srubar
AEI 2017: RESILIENCE OF THE INTEGRATED BUILDING
(2017)
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)
