Article
Materials Science, Ceramics
Carolyn Primus, James L. Gutmann, Franklin R. Tay, Anna B. Fuks
Summary: Calcium silicate cements and calcium aluminate cements are considered excellent materials in dentistry, promoting biomineralization and aiding in the repair of teeth.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Ceramics
Tristana Y. Y. Duvallet, Robert B. B. Jewell
Summary: The purpose of this research is to use animal wastes and by-products to produce low-energy and low-CO2 clinkers and cements, aiming to preserve natural resources, reduce CO2 emissions, and minimize potential health risks. Pure calcium sulfoaluminate clinker and various substituted clinkers were produced, with different phases depending on firing temperature. Preliminary results on hydration process and compressive strength of these binders are provided.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Thermodynamics
Jonathan Lapeyre, Sai Akshay Ponduru, Monday Okoronkwo, Hongyan Ma, Aditya Kumar
Summary: This study investigated the influence of limestone and calcium sulfate mineral additives on the hydration kinetics of high-alpha-Al2O3 calcium aluminate cement. Limestone exhibited limited acceleratory effects due to its coarse particle size distribution, while calcium sulfate accelerated the heat flow rate of the cement by acting as a favorable surface for heterogenous nucleation. Increasing the replacement level of limestone or calcium sulfate resulted in different effects on the hydration kinetics and heat release of the cement.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Construction & Building Technology
G. M. Kim, S. M. Park, S. W. Park
Summary: The present study investigated the chloride removal characteristics of calcium aluminate cements in chlorinated solution. The reaction and physicochemical characteristics of chloride-bearing calcium aluminate cement powders in the solutions were systematically investigated. The results showed that the chloride removal rate increased with the content of Al2O3 in the cement powders, and the reaction route for chloride removal involved the transformation of C2AH8 into hydrocalumite phases.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2023)
Article
Construction & Building Technology
N. Maach, J. F. Georgin, S. Berger, J. Pommay
Summary: Calcium aluminate cements are niche cements used in the refractory industry and in non-structural applications for building chemistry. The study showed that the flux of hydroxide ions plays a key role in the chemical mechanisms of calcium aluminate cements.
CEMENT AND CONCRETE RESEARCH
(2021)
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
Jae-Min Lee, Hee Jun Yang, Il-Young Jang, Seong Kyum Kim, Dong-Hyuk Jung
Summary: This study examines the influence of CA2 in calcium aluminate cement on strength development. The results show that CAC containing CA2 exhibits a gradual increase in strength, while typical CAC suffers from strength loss due to conversion reaction. This difference in performance may be attributed to CA2 hydration, which mitigates the transformation of metastable hydrates into stable ones.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2022)
Article
Materials Science, Ceramics
John F. Zapata, Maryory A. Gomez, Henry A. Colorado
Summary: This study investigates the damage generated with high-temperature compression tests in pure calcium aluminate cement pastes with quartz. Two types of CACP formulations were tested and characterized, with activation energy and creep micro-mechanisms also being studied. The results showed distinct activation energies for different CACP formulations.
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2021)
Review
Pharmacology & Pharmacy
Valeria Ambrogi
Summary: Calcium carbonate is a versatile excipient that can be used to improve the dissolution rate of poorly soluble drugs. Its many interesting characteristics, including quick dissolution in gastric fluid, low cost, and safety, make it an attractive option. This review provides an overview of the use of calcium carbonate as an excipient for enhancing drug dissolution rates, including the drug loading procedure, physical characterization of the drug/CaCO3 samples, and discussion of potential mechanisms for dissolution improvement.
Article
Construction & Building Technology
Maciej Zajac, Linda Irbe, Frank Bullerjahn, Harald Hilbig, Mohsen Ben Haha
Summary: The carbonation hardening of Portland cement concrete has been studied to investigate the reaction mechanisms involved, which can impact reaction kinetics, phase assemblage, and microstructure evolution. Carbonation and hydration reactions decrease pore volume, refine porosity, and improve the microstructure of concrete.
CEMENT AND CONCRETE RESEARCH
(2022)
Review
Construction & Building Technology
Nailia Rakhimova
Summary: This article analyzes and reviews the role of calcium and/or magnesium carbonate rocks and carbonate-bearing clays in the development of alkali-activated cements (AACs). It finds that the addition of limestone powder can improve the properties of AACs and suggests that carbonate-bearing clays are potential sources for AACs production.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Hongen Ma, Ru Wang, Ziyan Xi, Hanqing Gao, Herve Fryda, Peiming Wang
Summary: This paper investigates the inhibitory effect of styrene-butadiene copolymer (SB) on the whitening of calcium aluminate cement (CAC) mortar. The results show that SB reduces the production of certain carbonation products and inhibits the whitening of mortar. Furthermore, the addition of SB enhances the hydrophobicity of CAC mortar, reduces water absorption, and forms a polymer film, preventing the contact of ions and CO2 with the cement hydrate, thus inhibiting the production of white deposits on the mortar surface and whitening.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Tatiana Litvinova, Ruslan Kashurin, Ivan Zhadovskiy, Stepan Gerasev
Summary: The complex use of mineral raw materials is significant in many industries, especially in the rare earth industry where a comprehensive solution has not yet been developed. This study examines the kinetics of the dissolution process of poorly soluble lanthanide compounds, showing the dependence of lanthanide extraction on variables such as temperature, concentration of complexing agent, and mixing intensity. The results provide insight into the activation energy and reaction orders, with the prospect of creating a mathematical model for extracting a rare earth metal by the carbonate alkaline method.
Article
Materials Science, Ceramics
Liu Guo, Xiaoyu Wang, Ye Li, Yuandong Mu, Quanli Jia, Gang Wang, Liugang Chen
Summary: Introducing micro-sized basic zinc carbonate into high alumina castables improved their properties after firing at high temperatures, with enhanced strength and hot modulus of rupture. The addition of BZC resulted in improved volume stability and mechanical properties compared to castables with Zn(OH)2.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
El Mehdi Toufik, Hassan Noukrati, Christian Rey, Yannick Coppel, Cedric Charvillat, Allal Barroug, Hicham Ben Youcef, Christele Combes
Summary: This study successfully synthesized water-soluble phosphorylated chitosan and introduced it into calcium carbonate cement for bone repair. The results showed that phosphorylated chitosan could control the composition, bioactivity, and physicochemical properties of the cement, while exhibiting good handling and anti-washout properties.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Physical
Sukanta K. Mondal, Adam Welz, Carrie Clinton, Kamal Khayat, Aditya Kumar, Monday U. Okoronkwo
Summary: This study presents a novel and reliable rheological method for quantifying the workability of calcium sulfoaluminate (CSA) cement pastes modified with citric acid and polycarboxylate ether (PCE)-based superplasticizer. The method can characterize the interaction or co-influence of multiple admixtures on early-age properties of the cement paste and provide a quantitative rheological protocol for determining the workability and a novel approach to material selection and mixture design.
Article
Green & Sustainable Science & Technology
Sukanta K. Mondal, Carrie Clinton, Hongyan Ma, Aditya Kumar, Monday U. Okoronkwo
Summary: To promote the sustainable development of eco-efficient calcium sulfoaluminate (CSA) cements, the effects of coal fly ashes on the properties of CSA-based cement paste were investigated. Both Class C and Class F fly ashes were studied and were found to improve the workability and accelerate the hydration of CSA cement paste. The addition of fly ash reduced the 1-day compressive strength but increased the 28-day strength, with Class C fly ash showing higher strength due to a higher degree of reaction and more cohesive binding C-S-H-based gels formed.
Article
Engineering, Manufacturing
Sahil Surehali, Avinaya Tripathi, Atharwa Samir Nimbalkar, Narayanan Neithalath
Summary: Layered concrete systems obtained using 3D printing show defects in layer and filament interfaces, affecting the transport of moisture and ionic species and impacting durability. This study investigates the influence of layer heights and transport directions on the non-steady state chloride migration coefficients of 3D printed concretes. The direction-dependent coefficients are found to be 10-30% higher than those of cast samples, with the inter-filament interfaces being more detrimental. The findings provide guidance on choosing printing directions with respect to ionic ingress.
ADDITIVE MANUFACTURING
(2023)
Article
Chemistry, Analytical
Yiyang Zhuang, Taihao Han, Qingbo Yang, Ryan O'Malley, Aditya Kumar, Rex E. Gerald II, Jie Huang
Summary: In this study, a smart helmet with an embedded fiber Bragg grating (FBG) sensor was developed to monitor complex blunt force impact events in real time. Utilizing machine learning algorithms, the impact magnitude, direction, and latitude can be accurately recognized. This system may become a crucial intervention alternative during traumatic brain injury events.
Article
Computer Science, Artificial Intelligence
Taihao Han, Sai Akshay Ponduru, Arianit Reka, Jie Huang, Gaurav Sant, Aditya Kumar
Summary: The dissolution kinetics of tricalcium silicate (C3S) in undersaturated solvents can be accurately predicted using the deep forest (DF) model, which takes into account various variables such as measurement method, temperature, and physicochemical properties of solvents.
Article
Construction & Building Technology
Taihao Han, Rohan Bhat, Sai Akshay Ponduru, Amit Sarkar, Jie Huang, Gaurav Sant, Hongyan Ma, Narayanan Neithalath, Aditya Kumar
Summary: This study uses a deep forest model to predict the composition- and time-dependent hydration kinetics and compressive strength of [PC + FA] binders. Data dimensionality-reduction and segmentation techniques are employed to enhance the model's prediction performance, and a simple analytical model is developed to predict compressive strength and reveal the correlations between mixture design and compressive strength of [PC + FA] binders.
CEMENT AND CONCRETE RESEARCH
(2023)
Article
Polymer Science
Marcos Batistella, Jean-Claude Roux, Gwenn le Saout, Emanuela Callone, Sandra Dire, Constantinos Xenopoulos, Jose-Marie Lopez-Cuesta
Summary: Fly ash, previously considered as waste, has unique properties and compositions that make it suitable as an engineering material. The use of fly ash as a component in flame retardant systems can help reduce the environmental impact of polylactide. Combining fly ash with flame retardants showed improved fire performance, with new compounds formed and synergistic effects observed in the condensed phase.
POLYMER DEGRADATION AND STABILITY
(2023)
Article
Polymer Science
Marcos Batistella, Jean-Claude Roux, Nour-Alhoda Masarra, Gwenn le Saout, Constantinos Xenopoulos, Jose-Marie Lopez-Cuesta
Summary: The present study evaluates the incorporation of fly ash in polybutyl succinate (PBS) and polybutyl adipate terephtalate (PBAT) as partial replacement of ammonium polyphosphate and/or melamine polyphosphate. The influence of surface modification of fly ash with two silanes and titanate coupling agents is also studied. Cone calorimeter experiments, pyrolysis combustion flow calorimeters (PCFCs), and UL94V tests are used to assess the fire performance of the composites. Scanning electronic microscopy, X-microanalysis, and X-ray diffractometry analysis are carried out on cone calorimeter residues to understand the fire-retardant mode of action. X-ray diffractometry highlights the formation of new components due to the presence of fly ash, indicating synergistic effects between the flame-retardant system and fly ash. X-microanalysis results show that the main fraction of initial phosphorous is present in the cone calorimeter residue, suggesting the proposed system acts in a condensed phase.
Article
Chemistry, Physical
Keitumetse Monyake, Taihao Han, Danish Ali, Lana Alagha, Aditya Kumar
Summary: The study used artificial neural network (ANN) and random forests (RF) machine learning models to predict the efficiency of synthesized chitosan-polyacrylamide copolymers (C-PAMs) in the depression of iron sulfide minerals while valuable base metal sulfides were floated in the froth flotation process. The RF model showed higher accuracy in predicting the depression of pyrite compared to the ANN model. Fundamental investigations on the surface chemistry of C-PAMs at the mineral-water interface were also conducted to gain insights into the behavior of different metal sulfides during flotation.
COLLOIDS AND INTERFACES
(2023)
Article
Construction & Building Technology
Kamran Aghaee, Taihao Han, Aditya Kumar, Kamal H. Khayat
Summary: Expansive agent (EA) and shrinkage reducing admixture (SRA) are used to reduce shrinkage and cracking in concrete. However, high contents of EA and SRA can impair the microstructure of concrete. This study investigates the effect of using EA, SRA, and their combination on the mechanical, shrinkage, and microstructural properties of fiber-reinforced mortar (FRM).
CEMENT AND CONCRETE RESEARCH
(2023)
Article
Construction & Building Technology
Taihao Han, Jie Huang, Gaurav Sant, Narayanan Neithalath, Ashutosh Goel, Aditya Kumar
Summary: This study develops an advanced model that utilizes artificial intelligence to accurately predict the hydration kinetics of [PC + SCM] binders, achieving high reliability.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Chemistry, Physical
Sahil Surehali, Avinaya Tripathi, Narayanan Neithalath
Summary: This paper analyzes the effect of print layer heights and loading direction on the compressive response of plain and fiber-reinforced 3D printed concrete. The study shows that fiber reinforcement can reduce the lower strength of 3D printed specimens when compared to cast specimens. Digital image correlation is used to acquire strain profiles and characterize the directional dependence of peak stress and strain. Orienting weaker interfaces appropriately or strengthening them through material modifications enables attainment of near-isotropy in 3D printed concrete elements.
Article
Geochemistry & Geophysics
Taihao Han, Bryan K. Aylas-Paredes, Jie Huang, Ashutosh Goel, Narayanan Neithalath, Aditya Kumar
Summary: This study explores the prediction of compressive strength in limestone calcined clay cement (LC3) using a machine learning model. Three feature reduction methods are employed to analyze the impact of LC3 components and mixture design on compressive strength. Practical guidelines for applying these methods on cementitious materials are provided, and a feature enhancement method is utilized to improve prediction accuracy.
Article
Chemistry, Multidisciplinary
Juan Carlos Vega-Vila, Advait Holkar, Ross A. Arnold, Dale P. Prentice, Shiqi Dong, Longwen Tang, Erika Callagon La Plante, Kirk Ellison, Aditya Kumar, Mathieu Bauchy, Samanvaya Srivastava, Gaurav Sant, Dante Simonetti
Summary: This study investigates the adaptable nature of metal cations during hydrothermal synthesis by synthesizing porous materials without organic structure-directing agents. The results show that phillipsite is crystallized selectively in the presence of sodium and potassium, while partial substitution of sodium and potassium with calcium results in the co-precipitation of tobermorite phases. Exclusive tobermorite precipitation is observed when only calcium is used. These findings demonstrate the important role of metal cations in crystallization processes and their ability to vary framework topology in porous materials.
REACTION CHEMISTRY & ENGINEERING
(2023)
