Article
Chemistry, Multidisciplinary
Zhipeng Zhang, Zhichao Liu, Fazhou Wang, Shuguang Hu
Summary: The synergy of carbonation of portlandite and Mg-based binders can enhance the CO2 uptake, mechanical property, and thermodynamic stability of Mg- and Ca-based binders. The study reveals that the compressive strength and degree of carbonation of compacts initially increase and then decrease with the increase of Ca(OH)2 content. The mixing of Mg(OH)2 and Ca(OH)2 significantly enhances the carbonation degree of both hydroxides.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2023)
Article
Construction & Building Technology
Vineet Shah, James Mackechnie, Allan Scott
Summary: The study aims to understand how CO2 buffering capacity and pore structure characteristics affect the carbonation rate of concrete. The influence of different concrete parameters on the carbonation rate of 11 concrete mixes made with Portland cement and various supplementary cementitious materials (SCMs) is investigated. The study finds no significant correlation between the carbonation rate and measured concrete parameters. A pragmatic approach is proposed to measure the carbonation resistance of concrete using tortuosity and cement content, providing an alternative to time-consuming carbonation tests.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Materials Science, Multidisciplinary
Sen Shao, Jingkai Bi, Pengyue Gao, Guangtao Liu, Mi Zhou, Jian Lv, Yu Xie, Yanchao Wang
Summary: In this study, it was found that Ca(OH)(2) can remain stable under high pressures, with two different structures proposed. The high-pressure phases of Ca(OH)(2) are predicted to be stable against decomposition into CaO and H2O under certain pressure and temperature conditions.
Article
Chemistry, Multidisciplinary
Wenting Gu, Yanfei Wei, Bingbing Liu, Liuyong Hu, Lei Zhong, Guoke Chen
Summary: The nanocomposite PAAG@Ca(OH)(2) successfully protected murals with excellent properties, opening up a new avenue for mural protection.
Review
Archaeology
Jinmeng Zhu, Peiyao Zhang, Jinghan Ding, Ying Dong, Yijian Cao, Wenqiang Dong, Xichen Zhao, Xuanhua Li, Mara Camaiti
Summary: Nano Ca(OH)(2), also known as nanolime, has been investigated as a promising inorganic nanomaterial for heritage conservation due to its excellent compatibility and ageing resistance. It has been used in consolidating wall paintings, stone artworks, and deacidifying paper relics, with researchers identifying challenges and proposing potential solutions to improve its performance. This review aims to promote further research on nano Ca(OH)(2) and its application in heritage conservation.
JOURNAL OF CULTURAL HERITAGE
(2021)
Article
Engineering, Environmental
Helena Moreno, Francisco Pontiga, Jose M. Valverde
Summary: This paper investigates CO2 capture at room temperature and atmospheric pressure using a fluidized bed of Ca(OH)(2) powder, finding that an increase in relative humidity promotes CO2 capture, especially at near 100% RH. Quantitative analyses using X-ray powder diffractometry reveal that CaCO3 content in samples stored under high humidity originates from carbonation.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Construction & Building Technology
Sumit Srivastava, Ruben Snellings, Vera Meynen, Pegie Cool
Summary: This study investigates the carbonation-cementation and bulk reaction mechanisms in systems with different Ca(OH)2 content, CO2 pressure, and temperature, leading to the formation of solid solutions of the (CaxFe1-x)CO3 series minerals and varying product morphologies and cementation performances. Additionally, the exceptional formation of Fe-LDH and (Ca,Fe)-LDH has been observed in some systems, which remained stable even after being exposed to ambient conditions for over 75 days.
CEMENT & CONCRETE COMPOSITES
(2021)
Article
Green & Sustainable Science & Technology
Yanjie Tang, Gang Liu, Katrin Schollbach, Yuxuan Chen, Wei Chen, H. J. H. Brouwers
Summary: This paper evaluates the production of lightweight aggregates using hydrated cement paste powder (HCP) through carbonation and normal curing methods. The study shows that different types of aggregates require different optimal carbonation periods and the addition of silica fume improves the strength development of the aggregates. This research contributes to a better understanding and optimization of the preparation method for lightweight aggregates.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Engineering, Chemical
Aman Gupta, Paul D. Armatis, Piyush Sabharwall, Brian M. Fronk, Vivek Utgikar
Summary: The study aims to enhance the reaction rate of Ca(OH)(2) decomposition by adding an inert agent. Addition of CaTiO3 significantly increases the kinetic parameters, leading to an increase in the reaction rate.
CHEMICAL ENGINEERING SCIENCE
(2021)
Article
Construction & Building Technology
Yushan Gu, Alisa Machner, Klaartje De Weerdt, Aljosa Sajna, Lucija Hanzic, Arnaud Mueller, Benoit Bary
Summary: This paper investigates the behavior of novel cementitious materials prepared with a low clinker cement CEM II/C-M (S-LL) upon exposure to CO2. A simplified carbonation model is applied to simulate accelerated carbonation tests in the laboratory, considering the dissolution and precipitation of different phases. The model response is compared to experimental data, including portlandite profiles and carbonation depth measurements.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Metallurgy & Metallurgical Engineering
Shi-jie Lyu, Jiang-tao Li, Xu-heng Liu, Xing-yu Chen, Li-hua He, Feng-long Sun, Zhong-wei Zhao
Summary: This paper introduces the unique and widely used tungsten metallurgy technology in China, caustic soda autoclaving process for digesting scheelite (CaWO4), and reports on its operational details and theoretical basis.
JOURNAL OF CENTRAL SOUTH UNIVERSITY
(2023)
Review
Chemistry, Physical
Carlos Pico-Cortes, Yury Villagran-Zaccardi
Summary: Recycled aggregate concrete (RAC) is a method to achieve a circular economy by using recycled concrete aggregates as substitutes for natural aggregates. This paper provides an in-depth examination of recent advances in the carbonation performance of RAC, focusing on factors that influence CO2 diffusion and the carbonation rate. The replacement ratio, source concrete quality, interfacial transition zone features, residual portlandite content, and porosity all play important roles in the carbonation process.
Article
Construction & Building Technology
M. Mar Barbero-Barrera, Luz S. Gomez-Villalba, Duygu Ergenc, Aranzazu Sierra-Fernandez, Rafael Fort
Summary: The use of nanoparticles in lime mortars has a significant impact on their mechanical and hydric properties, which is influenced by the type of nanoparticles and curing conditions.
CEMENT & CONCRETE COMPOSITES
(2022)
Article
Engineering, Chemical
Gabriel Falzone, Iman Mehdipour, Narayanan Neithalath, Mathieu Bauchy, Dante Simonetti, Gaurav Sant
Summary: This study investigates the effects of reaction temperature, relative humidity, and CO2 concentration on the carbonation of Portlandite, revealing that relative humidity significantly impacts the rate and thermodynamics of the carbonation reactions. Additionally, microstructural constraints in monolithic compacts hinder the progress of carbonation due to pore blocking by liquid water.
Article
Chemistry, Physical
Yolanda A. A. Criado, Borja Arias, J. Carlos Abanades
Summary: This study focuses on the application of CO2 capture technologies in backup power systems. The use of Ca(OH)2 powder enables the design of low-cost carbonators for capturing diluted CO2. Storing CaCO3 and Ca(OH)2 separately allows for the decoupling of the CO2 capture step and the regeneration of Ca(OH)2 in the oxy-calciner/hydrator block. Simulations show that the thermal capacity of the oxy-calciner is only 2% of the gross power output of the NGCC gas turbine for a backup power plant with a NGCC capacity factor of 0.1. A capture efficiency of 90% can be achieved without modifying the operating conditions of the gas power plant, resulting in a global efficiency of 38% for the system with CO2 capture. Economic analysis suggests that this scheme is suitable for retrofitting natural gas-based power plants, with a cost of CO2 avoided of approximately $200 per tCO2.
SUSTAINABLE ENERGY & FUELS
(2022)
Article
Chemistry, Multidisciplinary
Felipe Diaz-Soler, Carlos Rodriguez-Navarro, Encarnacion Ruiz-Agudo, Andronico Neira-Carrillo
Summary: By stabilizing calcium oxalate precursors in vitro using PAA, the nucleation of ACO nanoparticles can be delayed, which may contribute to a better understanding of the pathological mineralization leading to urolithiasis in mammals.
Article
Geochemistry & Geophysics
L. Monasterio-Guillot, A. Fernandez-Martinez, E. Ruiz-Agudo, C. Rodriguez-Navarro
Summary: The weathering and carbonation of primary silicates are crucial for geochemical cycling of elements and climate regulation. The study investigated dissolution-carbonation reactions of Ca-Mg pyroxenes, revealing low-magnesium calcite and amorphous silica as main products. The presence of Fe and Al in the pyroxenes enhances cation release and contributes to secondary phase formation.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2021)
Article
Construction & Building Technology
R. Navarro, D. Pereira, E. Fernandez de Arevalo, E. M. Sebastian-Pardo, C. Rodriguez-Navarro
Summary: This study provides a thorough examination of the main features, decay causes, and mechanisms of serpentinites on the main facade of the 16th century Royal Chancery in Granada, Spain. Various decay factors are identified, with chemical weathering of sulfides and the formation of sulfate salts considered the main cause of deterioration. Unsuitable restoration treatments, environmental pollution, and the proximity of slabs to the ground also contribute to their decay. This research enhances understanding of the deterioration process of serpentinite ornaments and proposes appropriate conservation measures.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Materials Science, Biomaterials
Encarnacion Ruiz-Agudo, Cristina Ruiz-Agudo, Fulvio Di Lorenzo, Pedro Alvarez-Lloret, Aurelia Ibanez-Velasco, Carlos Rodriguez-Navarro
Summary: This study demonstrates that citrate not only stabilizes liquid-like calcium phosphate precursors, but also influences the formation process of bone mineralization, providing new clues to answer the long-standing question of why natural evolution favored HAp as the mineral phase in bone.
ACS BIOMATERIALS SCIENCE & ENGINEERING
(2021)
Article
Geochemistry & Geophysics
L. Monasterio-Guillot, C. Rodriguez-Navarro, E. Ruiz-Agudo
Summary: Weathering of primary silicate minerals under acidic conditions results in the formation of cracks and silica precipitates, with more abundance in the case of augite due to its faster reaction rate. Dissolution of diopside leads to the formation of an amorphous magnesium silicate hydrate precursor, indicating high pH conditions during dissolution process.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2021)
Review
Construction & Building Technology
Kerstin Elert, Carlos Rodriguez-Navarro
Summary: Significant progress has been made in understanding the degradation processes affecting building and ornamental stone in recent decades. However, there is still limited understanding of stone damage caused by swelling clays, which hinders the development of effective conservation treatments. This article reviews the damage process associated with swelling clays, discusses the proposed mechanisms for its development, and examines the key factors controlling its origin, evolution, and severity. Alternative treatments and conservation approaches are also presented and discussed.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Kerstin Elert, Fadwa Jroundi, Cristina Benavides-Reyes, Elen Correa Gomez, Davide Gulotta, Carlos Rodriguez-Navarro
Summary: Earth is an important construction material throughout history but requires constant maintenance and consolidation. This study compares the effectiveness of different consolidants and methods for rammed earth, providing recommendations for optimizing consolidation treatments.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Chemistry, Applied
Jing He, Weiqiang Zhou, Dongbo Hu, Shaojun Liu, Jorge Otero, Carlos Rodriguez-Navarro
Summary: This research focuses on the characterization and identification of degradation mechanisms of the wall paintings at the Samye Temple in Tibet. The findings provide insights into the traditional manufacturing process of historic wall paintings in Tibet and contribute to further conservation activities of this culturally significant temple.
Article
Crystallography
Christine V. Putnis, Andrew Putnis
Summary: This article discusses the process of ion exchange in a range of solids through interface-coupled dissolution-precipitation in the presence of an aqueous solution.
JOURNAL OF CRYSTAL GROWTH
(2022)
Article
Chemistry, Multidisciplinary
Miguel Burgos-Ruiz, Kerstin Elert, Encarnacion Ruiz-Agudo, Helmut Coelfen, Carlos Rodriguez-Navarro
Summary: A novel solvothermal synthesis process is developed to obtain highly reactive nanostructured Ca(OH)(2) particles, which can be easily functionalized with silica-gel derivatives. This functionalization improves the reactivity and bonding of nanolimes, and can also be used as a self-integrated coupling agent.
Article
Materials Science, Multidisciplinary
Kerstin Elert, Encarnacion Ruiz-Agudo, Fadwa Jroundi, Maria Teresa Gonzalez-Munoz, Barbara W. Fash, William L. Fash, Nieves Valentin, Alberto de Tagle, Carlos Rodriguez-Navarro
Summary: A large amount of stone sculptural and architectural heritage is deteriorating, especially in tropical environments. The decaying of tuff stone carvings at the Maya site of Copan is primarily caused by stress from humidity-related clay swelling. However, a bioconservation treatment involving the application of a sterile nutritional solution has proven to effectively strengthen the stone by activating indigenous bacteria to produce CaCO3 biocement, while also reducing clay swelling.
NPJ MATERIALS DEGRADATION
(2021)
Article
Chemistry, Multidisciplinary
Miguel Burgos-Ruiz, Gloria Pelayo-Punzano, Encarnacion Ruiz-Agudo, Kerstin Elert, Carlos Rodriguez-Navarro
Summary: A novel solvothermal method was reported for synthesizing bassanite nanoparticles using amorphous Ca-ethoxide as a precursor, resulting in nanorods with high specific surface area and enhanced reactivity. These nanoparticles have potential applications in various fields.
CHEMICAL COMMUNICATIONS
(2021)