Article
Materials Science, Ceramics
Jian Li, Zhibin Ma, Jianming Gao, Yanxia Guo, Fangqin Cheng
Summary: Using circulating fluidized bed fly ash (CFBFA) to prepare geopolymer as a substitute for cement can reduce CO2 emissions and solve environmental problems. The effects of alkali activator modulus and curing temperature on the mechanical properties of geopolymers were investigated, and their relationship with phase composition, micromorphology, and chemical structure was established. The results show that the compressive strength of geopolymer decreases with the increase of alkali activator modulus and increases with the increase of curing temperature, but decreases after 28 days. The 90 days compressive strength reaches 34.7 MPa under certain conditions.
CERAMICS INTERNATIONAL
(2022)
Article
Green & Sustainable Science & Technology
Ngiseng Seav, Kyoung Su Kim, Jae Hoon Kim, Seung Woo Lee, Young Kyu Kim
Summary: Coal bottom ash (CBA) is a by-product generated in the coal furnaces of thermal power plants. Many previous studies have focused on its application as a replacement for sand in conventional concrete and structural fill materials. Roller compacted concrete (RCC), a zero-slump concrete with better compressive strength, requires a large amount of sand. However, the use of CBA in RCC is limited. This study aims to evaluate the effect of CBA as a sand replacement in RCC in terms of strength and long-term performance.
Article
Materials Science, Ceramics
Faping Li, Defeng Chen, Yiyan Lu, Haojun Zhang, Shan Li
Summary: Experimental research was conducted to investigate the freeze-thaw behavior of mixed fiber-reinforced geopolymer mortars. The results showed that the addition of modified MWCNTs and PVA fibers significantly improved the resistance against freeze-thaw cycles of geopolymer mortars. Furthermore, the utilization of modified MWCNTs and PVA fibers was found to decrease the porosity of the mortars, as revealed by MIP analysis.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2022)
Article
Polymer Science
Natalia Wielgus, Jan Kubica, Marcin Gorski
Summary: The paper explores a novel approach to using FBC fly ash as the main raw material for geopolymer, resulting in a promising environmentally friendly material with good mechanical properties for construction applications. The study found that specific compositions and demolding times significantly impact the basic mechanical properties of the geopolymer, with a mixture of FBC fly ash to metakaolin in a mass ratio of 3:1 and a demolding time of 14 days showing the best results for construction materials.
Article
Construction & Building Technology
Baifa Zhang, Yuan Feng, Jianhe Xie, Dongming Lai, Ting Yu, Dongchao Huang
Summary: This study investigated the effects of incorporating waste rubber as fine aggregate in geopolymer concrete, finding that moderate addition of rubber can improve the mechanical properties and freeze-thaw resistance of the concrete. The optimal replacement ratio is 10%, which ensures high strength and good performance.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Suhawn Ju, Sungjun Bae, Jueun Jung, Sungwoo Park, Sukhoon Pyo
Summary: This research proposes the use of coal bottom ash (CBA) in metakaolin-based geopolymers. By treating CBA with an alkaline solution and mixing it with metakaolin, the proposed method minimizes the degrading effect of CBA on the compressive strength of geopolymers. The study shows that this method can accommodate a larger amount of CBA and achieve higher compressive strength compared to the conventional mixing method.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Environmental Sciences
Laila Taoufiq
Summary: The study evaluated the use of bottom ash in concrete, showing that it can impact compressive strength at early stages but the effect diminishes over time. Bottom ash can effectively replace cement and sand in concrete, positively affecting its performance.
JOURNAL OF MATERIAL CYCLES AND WASTE MANAGEMENT
(2021)
Article
Construction & Building Technology
Priyanka Pradhan, Saswat Dwibedy, Monalin Pradhan, Soumyaranjan Panda, Saubhagya Kumar Panigrahi
Summary: This article summarizes the research on the durability characteristics of geopolymer concrete (GPC), including an analysis of twelve characteristics and twenty factors, as well as the limitations in global acceptance and the scope of further research. These discussions can increase researchers' confidence in GPC and enhance its acceptability worldwide.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Green & Sustainable Science & Technology
Jin Yang, Yuanzhen Tang, Xingyang He, Ying Su, Jingyi Zeng, Mengyang Ma, Linghao Zeng, Shaolin Zhang, Hongbo Tan, Bohumir Strnadel
Summary: Geopolymer made from fly ash is a potential environmentally friendly and inexpensive alternative to high-emission cement production. In this study, wet-milling mechanical force and calcium hydroxide were used to prepare high-performance alkaline calcium activated geopolymers. Increasing the content of calcium hydroxide improved the strength and chloride resistance of the geopolymers, but also increased the autogenous shrinkage. Wet-milled fly ash geopolymers showed even greater improvements due to the pre-depolymerization effect of wet-milling and the activation effect of calcium hydroxide. The resulting geopolymers had significantly improved compressive strength and microstructure, and performed better than Portland cement in terms of environmental impact.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Construction & Building Technology
Xianliang Zhou, Yulin Chen, Changwu Liu, Fan Wu
Summary: The preparation of lightweight aggregates using sewage sludge ash by cold bonding technology is an effective method for disposing of sewage sludge ash. In this study, granulated blast furnace slag was mixed with sewage sludge ash to improve the performance of the lightweight aggregates. The physical and mechanical characteristics of the lightweight aggregates were investigated, and it was found that they had suitable properties for use in sustainable lightweight concrete.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Mijia Yang, Shree Raj Paudel, Zhili Jerry Gao
Summary: Geopolymer composite, as an innovative and eco-friendly construction material, has various uses, including snowproof roadways. Adding a small amount of steel fibers can greatly enhance its compressive strength and electrical conductivity, while curing at elevated temperatures for the initial 24 hours improves its mechanical properties.
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2021)
Article
Construction & Building Technology
Xiaonan Ge, Xiang Hu, Caijun Shi
Summary: Circulating fluidized bed fly ash (CFA) and red mud (RM)-based geopolymers were characterized in terms of setting time, mechanical properties, microstructure, chemical and mineral compositions. The effects of curing duration, curing temperature, and RM/CFA mass ratio were considered. The study found that longer curing time and higher curing temperature increase strength, while a lower RM/CFA ratio causes a reduction in mechanical properties. The results show a strong correlation between strength, porosity, and amorphous phase content. Under ambient curing conditions, an RM/CFA ratio of 39% is identified as the critical upper limit for producing geopolymers with desired mechanical properties and microstructure.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Zhenzhen Jiao, Xueying Li, Qinglin Yu
Summary: This study investigated the impact of curing conditions on the freeze-thaw resistance of geopolymer mortars. The results showed that steam curing led to better early-age strength and improved freeze-thaw resistance. The water-to-ash ratio was found to play a critical role in the freeze-thaw resistance under different curing conditions.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Polymer Science
Mohamed Abdellatief, Hani Alanazi, Mohammed K. H. Radwan, Ahmed M. Tahwia
Summary: The main obstacle of using geopolymer as a construction repair material is its slow strength development rate. This study investigates the feasibility of developing an ultra-high performance geopolymer concrete (UHPGC) with high early-age strength. Experimental results reveal the optimal mix design and curing conditions for UHPGC, which exhibit superior early strength and microstructural characteristics. The findings emphasize the feasibility of using UHPGC as an eco-friendly quick repair material for improving the structural capacity and durability.
Article
Materials Science, Multidisciplinary
Maroua Zerzouri, Saliha Alehyen, Rabah Hamzaoui, Layella Ziyani, Abdellatif Loukili
Summary: This study found that fly ash-based geopolymer samples maintained a good surface appearance after high temperature exposure, but showed micro-cracks and a porous structure after exposure to acid, leading to a decrease in compressive strength of about 33.33%.
Article
Engineering, Environmental
S. Vinter, M. T. Montanes, V. Bednarik, P. Hrivnova
JOURNAL OF HAZARDOUS MATERIALS
(2016)
Article
Engineering, Environmental
Marketa Julinova, Roman Slavik, Martina Vyoralova, Alena Kalendova, Pavol Alexy
JOURNAL OF POLYMERS AND THE ENVIRONMENT
(2018)
Article
Environmental Sciences
Marketa Julinova, Jan Kupec, Roman Slavik, Maria Vaskova
ECOLOGICAL CHEMISTRY AND ENGINEERING S-CHEMIA I INZYNIERIA EKOLOGICZNA S
(2013)
Article
Polymer Science
Marketa Julinova, Roman Slavik, Alena Kalendova, Petr Smida, Jaromir Kratina
IRANIAN POLYMER JOURNAL
(2014)
Review
Environmental Sciences
Marketa Julinova, Roman Slavik
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2012)
Article
Chemistry, Multidisciplinary
J. C. Beltran-Prieto, K. Kolomaznik, R. Slavik
RUSSIAN JOURNAL OF GENERAL CHEMISTRY
(2014)
Article
Chemistry, Multidisciplinary
Jaroslav Melar, Vratislav Bednarik, Roman Slavik, Miroslav Pastorek
CENTRAL EUROPEAN JOURNAL OF CHEMISTRY
(2013)
Article
Engineering, Environmental
S. Vinter, V. Bednarik, M. T. Montanes, A. Cernotova, M. Kadleckova
Summary: This paper investigates the treatment of hazardous zinc-bearing waste using hydraulic binders and silicone polymers, and evaluates the effectiveness of the process through experiments. The results demonstrate that the two-step treatment method is more effective than using silicone polymers alone, with the porosity of the encapsulated waste being the main factor affecting leachability.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Chemistry, Applied
Tereza Kolackova, Daniela Sumczynski, Vratislav Bednarik, Stepan Vinter, Jana Orsavova, Katerina Kolofikova
Summary: This study investigated the digestibility, mineral content, and leaching ability of matcha, revealing high levels of minerals such as K, Mg, Mn, Ca, Fe, and Zn. Interestingly, the concentrations of elements in the non-digestible parts of matcha decreased in a specific order. The different methods of preparing matcha ice tea showed significant differences in quality, with low leaching factors for Na, Fe, and Se.
JOURNAL OF FOOD COMPOSITION AND ANALYSIS
(2021)
Article
Electrochemistry
Josef Reznicek, Vratislav Bednarik, Jaroslav Filip
Summary: This paper introduces and evaluates the application of electrochemical methods in the detection of perchlorate (ClO4-). It shows that ISE and ISE+voltammetric methods are superior to IC and MS in terms of sensitivity, and impedimetric and capacitance methods can achieve detection limits comparable to IC or MS. The paper also discusses related issues such as biosensing and direct electrochemical reduction of perchlorate, as well as the diversity of materials applicable for perchlorate sensors preparation. Overall, the critical review demonstrates that electrochemical ClO4- sensors can achieve the sensitivity of standard methods while retaining their portability and ease of operation.
ELECTROCHIMICA ACTA
(2023)
Article
Environmental Sciences
Ludmila Vanharova, Marketa Julinova, Roman Slavik
ECOLOGICAL CHEMISTRY AND ENGINEERING S-CHEMIA I INZYNIERIA EKOLOGICZNA S
(2017)
Article
Chemistry, Multidisciplinary
Martina Vyoralova, Roman Slavik, Marketa Julinova, Jarmila Vilcakova
Proceedings Paper
Computer Science, Theory & Methods
Juan Carlos Beltran-Prieto, Karel Kolomaznik, Roman Slavik
20TH INTERNATIONAL CONFERENCE ON CIRCUITS, SYSTEMS, COMMUNICATIONS AND COMPUTERS (CSCC 2016)
(2016)
Article
Electrochemistry
Juan Carlos Beltran Prieto, Roman Slavik, Karel Kolomaznik
INTERNATIONAL JOURNAL OF ELECTROCHEMICAL SCIENCE
(2014)
