Article
Thermodynamics
Ndigui Billong, Jonathan Oti, John Kinuthia, Rukshane Navaratne, Jiping Bai
Summary: In this study, un-densified silica fume was reacted with a 10 M sodium hydroxide solution to produce sodium silicate gel with a pH of 14, which was then dried and analyzed thermogravimetrically. The results suggested potential applications of the gel as high-temperature lubricants and alkaline activators, with enhanced sustainability in reducing embodied energy for production.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Construction & Building Technology
Kunal Krishna Das, Eddie Siu-Shu Lam, Jeong Gook Jang
Summary: In preplaced aggregate concrete (PAC), incorporating supplementary cementitious materials such as ground granulated blast furnace slag (GGBS) and silica fume (SF) can improve the flowability and properties of the grout. The study evaluated the effects of different proportions of GGBS and SF, as well as the presence of sand, on the flowability, compressive strength, durability, and dimensional stability of PAC. The results showed that using a combination of GGBS and SF in the grout resulted in suitable flowability and acceptable strength, but removing sand from the grout improved its properties while deteriorating the properties of PAC. PAC produced with 40% GGBS and 10% SF exhibited comparable compressive strength and enhanced resistance to chloride ion penetration.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Green & Sustainable Science & Technology
Moruf Olalekan Yusuf
Summary: This study investigates the contribution of nano alumina to the performance of silica fume and ordinary Portland cement binary blended mortar. The results show that nano alumina has a positive effect on the consistency of silica fume blended mortar, but a negative effect on ordinary Portland cement mortar. Adding nano alumina reduces the setting time and increases the compressive strength of the silica fume blended mortar.
Article
Polymer Science
Muhammad Tahir Lakhiar, Sih Ying Kong, Yu Bai, Susilawati Susilawati, Izni Zahidi, Suvash Chandra Paul, Mavinakere Eshwaraiah Raghunandan
Summary: The research found that the compressive strength and splitting tensile strength of concrete produced using waste rubber powder decreased by 10-52% and 9-57%, respectively. An optimum silica fume content of 15% was recommended. As the content of waste rubber powder increased from 10% to 30%, changes were observed in density, splitting tensile strength, modulus of elasticity, and thermal conductivity of concrete.
Review
Construction & Building Technology
Monalisa C. Martins, Eloise A. Langaro, Gustavo Macioski, Marcelo H. F. Medeiros
Summary: This study evaluates the effect of partial replacement of Portland cement by silica fume and rice husk ash on concrete subjected to ammonium sulfate attacks. The results show that concrete without supplementary cementitious materials experienced a significant reduction in compressive strength when exposed to external ammonium sulfate attacks. Although the supplementary materials helped mitigate the degradation effects, they also led to high precipitation of gypsum on the surface.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Rongjin Cai, Tong Wu, Chuanqing Fu, Hailong Ye
Summary: Alkaline activation of ternary precursors composed of GGBS, FA, and SF allows for more versatile mixture design and higher strength at high temperatures, but strength decreases as temperature rises to 600 degrees Celsius, likely due to phase transformation of hydrates. Mixtures with different proportions exhibit softening and deformation at 800 degrees Celsius, indicating a lower sintering temperature of K-A-S-H compared to C-A-S-H.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Yanru Wang, Yubin Cao, Yuwei Ma, Shanshan Xiao, Jie Hu, Hao Wang
Summary: The study found that the calcium content in fly ash has little impact on the properties of AAFS binders, while low-calcium fly ash promotes the formation of high-aluminum-substituted C-(N)A-S-H gel and enhances compressive strength at later ages. Additionally, grinding process of fly ash promotes reactive SiO2 dissolution, potentially reducing setting and flowability of the binders. The replacement of silica fume and metakaolin also plays a role in enhancing the properties of AAFS binders.
JOURNAL OF SUSTAINABLE CEMENT-BASED MATERIALS
(2022)
Article
Construction & Building Technology
Andrielli Morais de Oliveira, Ana Paula Oliveira, Janine Domingos Vieira, Alex Neves Junior, Oswaldo Cascudo
Summary: This study analyzed and discussed the hydration development of ternary cement pastes modified with 8% silica fume and 3% nano-silica, with water/binder ratios of 0.4 and 0.6 up to 28 days. Various techniques such as micro-CT, XRD-Rietveld Method, TG/DTG/DSC analysis, calorimetry, and FTIR were used to obtain parameters. The presence of mineral additions led to reduced porosity and densification of the microstructure, resulting in accelerated hydration and pozzolanic reactions. The study also examined the effect of water content and discussed the positive impact on concrete durability properties.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Construction & Building Technology
Ebenezer O. Fanijo, Emad Kassem, Ahmed Ibrahim
Summary: The study demonstrated that the use of SCMs along with glass powder can significantly reduce ASR expansion, with binary or ternary blends of 20% replacement being effective for ASR mitigation, and the combination of glass powder with conventional SCMs performed better in reducing cracks due to ASR expansion.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Maksim Kamarou, Natalia Korob, Witold Kwapinski, Valentin Romanovski
Summary: The study found that synthetic gypsum is a promising source of gypsum-containing raw materials for producing gypsum binders, with performance that even exceeds that of binders obtained from natural gypsum stone.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2021)
Article
Environmental Studies
Hui Li, Ming Jia, Xue Zhang, Zipeng Wang, Yiding Liu, Jie Yang, Bing Yang, Yang Sun, Hanbing Wang, Hongwei Ma
Summary: This study investigates the fumes generated from 5 types of asphalt binders during pavement construction. The results show that the thermal weight loss and volatile organic compounds (VOC) integrations are quadratically related. The fumes consist of alkanes, benzenes, and polycyclic aromatic hydrocarbons (PAHs) with molecular weights ranging from 150 to 400.
TRANSPORTATION RESEARCH PART D-TRANSPORT AND ENVIRONMENT
(2023)
Article
Engineering, Civil
Aktham H. Alani, Megat Azmi Megat Johari, M. A. A. Aldahdooh, N. Muhamad Bunnori
Summary: The study demonstrates that incorporating silica fume and palm oil fuel ash as substitute materials in green high strength concrete can improve its early strength and transport properties.
EUROPEAN JOURNAL OF ENVIRONMENTAL AND CIVIL ENGINEERING
(2021)
Article
Green & Sustainable Science & Technology
Kangze Yuan, Wankui Ni, Le Zhao, Haiman Wang
Summary: The stabilization of loess is a matter of concern due to its potential for triggering geological hazards. This study explores the use of silica fume as a stabilizer and investigates its effects on the mechanical properties of loess. The results show that silica fume improves the strength of loess through both chemical and physical stabilization. Life cycle assessment reveals the environmental significance of promoting the use of silica fume in the stabilization of loess foundations.
SUSTAINABLE MATERIALS AND TECHNOLOGIES
(2023)
Review
Green & Sustainable Science & Technology
V. Jittin, R. Rithuparna, A. Bahurudeen, B. Pachiappan
Summary: This paper focuses on the synergistic utilization of industrial and agricultural by-products for the production of ternary binders in cement plants, as well as the influence of these by-products on the properties of the cementitious system. The study also highlights the comparable performance of ternary blends with conventional binders and proposes a framework for the cleaner production of sustainable ternary cement using industrial and agricultural wastes.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Construction & Building Technology
Bhupesh Jain, Gaurav Sancheti
Summary: Construction sectors worldwide are growing rapidly, leading to increased demand for raw materials. This research explores the use of industrial waste as substitutes for cement and sand in concrete to address this issue. The results show that replacing a certain percentage of cement and fine aggregate with silica fume and iron dust can improve the mechanical properties of concrete.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Thermodynamics
Lenka Scheinherrova, Eva Vejmelkova, Martin Keppert, Magdalena Dolezelova, Pavla Rovnanikova, Robert Cerny
Summary: Geopolymers are environmentally friendly binders that can lower costs and reduce carbon footprint compared to traditional Portland cement. This study prepared ceramic-based geopolymers using ceramic waste powder, achieving partial enhancement of mechanical properties and microstructural changes under accelerated carbonation conditions and higher curing temperatures.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Crystallography
Jan Ondruska, Tomas Hulan, Ivana Sunitrova, Stefan Csaki, Grzegorz Lagod, Alena Struharova, Anton Trnik
Summary: The study investigated the effect of adding natural zeolite to ceramic samples on their thermophysical properties up to 1100 degrees C. The results showed that the addition of zeolite decreased the values of most properties studied, except for thermal expansion. This finding suggests that the optimal amount of zeolite in the sample is 30 mass%.
Article
Archaeology
P. Bauerova, M. Kracik Storkanova, P. Macova, M. Pavlikova, L. Scheinherrova, M. Keppert
Summary: The investigation revealed that most of the late 19th-century mosaics from Czech Republic share common material features, indicating a possible origin in Austria. However, there are two mosaic beds that differ from the others in terms of composition.
Article
Chemistry, Analytical
Zbigniew Suchorab, Agnieszka Malec, Henryk Sobczuk, Grzegorz Lagod, Izolda Gorgol, Ewa Lazuka, Przemyslaw Brzyski, Anton Trnik
Summary: This article discusses the application of electric techniques based on the evaluation of apparent permittivity in moisture detection. By evaluating the sensitivity of non-invasive TDR sensors, the study shows that the spacing between sensor elements and material moisture content have different influences on the sensor's range of influence.
Article
Chemistry, Multidisciplinary
Tomas Hulan, Filip Obert, Jan Ondruska, Igor Stubna, Anton Trnik
Summary: The study compared the resonant frequencies measured by the sonic resonant method (SRM) and the impulse excitation technique (IET) to assess their equivalency, finding that both methods yielded similar results with no significant differences in the values measured. The relationship between the resonant frequencies was shown to be a line with a slope of 0.9993 & AP; 1.
APPLIED SCIENCES-BASEL
(2021)
Article
Construction & Building Technology
Lukas Fiala, Vojtech Pommer, Martin Bohm, Lenka Scheinherrova, Robert Cerny
Summary: This study analyzed the properties of alkali activated slag mortars containing graphite powder and found that the use of an appropriate amount of graphite powder can improve the material's self-heating performance while maintaining satisfactory electrical, thermal, and mechanical properties.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Thermodynamics
Igor Medved', Milan Jurci, Anton Trnik
Summary: This article investigates the melting and other first-order phase changes in phase change materials. The study finds that even in the case of pure substances with no hysteresis or supercooling, there are noticeable jumps and peaks in heat capacity, and the phase change temperature can be determined by measuring these peaks. The study also highlights the importance of the microstructure of phase change materials in calculating the phase change temperature.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2023)
Article
Chemistry, Physical
Stefan Csaki, Ivana Sunitrova, Frantisek Lukac, Grzegorz Lagod, Anton Trnik
Summary: This study investigated the thermal properties of illitic clay mixed with natural zeolite. The results showed that the amount of physically bound water in the samples increased with zeolite content. The dehydroxylation temperature of illite slightly decreased with the addition of zeolite. The mass loss and shrinkage of the samples increased significantly with zeolite content, while the beginning of the sintering temperature decreased. Moreover, the thermal diffusivity and thermal conductivity values decreased with the increase in zeolite content, indicating promising thermal insulating properties.
Article
Construction & Building Technology
F. Amor, M. Baudys, Z. Racova, L. Scheinherrova, L. Ingrisova, P. Hajek
Summary: This study aims to investigate the hydraulic and photocatalytic behavior of mixtures based on TiO2 and ZnO nanoparticles in cement pastes and High Performance Concretes (HPCs). The results showed that the addition of TiO2 improved the reactivity and photocatalytic properties of cement, while the addition of ZnO retarded the hydration process. Moreover, it was found that HPCs with titanium oxides exhibited significant degradation efficiency and discoloration ability.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2022)
Review
Construction & Building Technology
Lenka Scheinherrova, Martin Keppert, Robert Cerny
Summary: This paper focuses on the chemical aspects of using basalt in cement composites, which has not been sufficiently investigated before. It provides an overview of the main applications of basalt in cement composites and analyzes the effects of different fillers, aggregates, and reinforcement types on functional properties. The chemical reactivity of basalt in cementitious matrices and its interactions with corrosive environments are assessed. Suggestions for future research based on the gaps in current knowledge are also provided.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Green & Sustainable Science & Technology
Magdalena Dolezelova, Jitka Krejsova, Lenka Scheinherrova, Martin Keppert, Alena Vimmrova
Summary: This study investigated the water resistance of gypsum based composites prepared from composed binder and silica sand. The addition of supplementary cementitious materials (SCM) improved the strength and water resistance of the composites, with the composite containing silica fume achieving the highest strength. The composites with SCM also exhibited finer porous structures compared to gypsum mortar. The study demonstrated the potential of using SCM to enhance the environmental and functional efficiency of gypsum based composites.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Chemistry, Physical
Vincent Odhiambo Odhiambo, Lenka Scheinherrova, Silvester Ochieng Abuodha, John Nyiro Mwero, Joseph Mwiti Marangu
Summary: This study investigates the effects of sodium sulfate on limestone calcined clay cement (LC3) in wet-dry cycles. The LC3 blends showed good resistance to sodium sulfate, with lower initial absorption rate and higher compressive strengths compared to ordinary Portland cement (OPC). However, the long-term compressive strength of LC3 after exposure to sodium sulfate surpassed that of OPC.
Article
Materials Science, Multidisciplinary
S. Csaki, I. Stubna, T. Kaljuvee, P. Dobron, F. Lukac, A. Trnik
Summary: The electrical properties during firing of anorthite ceramic prepared from mixtures of illitic clay and fly ashes with high CaO content were investigated. The results showed that the addition of fly ashes decreased the shrinkage of the ceramics and introduced additional mineral phases. Ca2+ ions became the dominant charge carriers, and the electrical conductivity and relative dielectric constant were influenced by the content of fly ashes.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Materials Science, Ceramics
Omar Al-Shantir, Stefan Csaki, Michal Knapek, Adam Gres, Marek Stancik, Marek Vrabec, Anton Trnik
Summary: This study investigates the influence of compaction pressure and firing temperature on the microstructure, mechanical properties, and matrix density of electroporcelain samples. The results show that higher compaction pressure does not significantly improve mechanical properties, while higher firing temperature has a positive effect. An increase in firing temperature leads to a decrease in matrix density due to the formation of closed porosity above 1200 degrees C. The maximum mechanical properties are achieved after firing at 1300 degrees C.
CERAMICS INTERNATIONAL
(2023)
Article
Instruments & Instrumentation
Tomas Hulan, Igor Stubna, Omar Al-Shantir, Anton Trnik
Summary: This paper describes a dynamic thermomechanical analysis (D-TMA) apparatus for measuring the resonant frequency and internal damping of a sample using impulse excitation technique (IET) at temperatures up to 1250 ?. An electromagnetic impulser is used for excitation and free vibrations are recorded by an electret microphone. The furnace is made of refractory porous alumina bricks and alumina fiber pads.
MEASUREMENT SCIENCE REVIEW
(2023)