Article
Materials Science, Ceramics
Shuai Yang, Yun Lu, Yangang Guo, Baofeng Guo, Lei Chen, Miao Jin
Summary: This study investigated the crushing characteristics of alumina inclusions during hot compression. A prediction model of compressive strength of alumina inclusions was established based on the crushing behavior of alumina blocks under quasi-static load. The results showed that the hot compression process of alumina exhibited a typical brittle fracture, with compressive strength being more sensitive at lower apparent porosity.
CERAMICS INTERNATIONAL
(2021)
Article
Engineering, Geological
Wei Zhou, Jialin Cheng, Guike Zhang, Hongbi Li, Yonggang Cheng, Gang Ma, Xiang Ji
Summary: It has been found that the physical and mechanical properties of rockfill materials deteriorate with wetting-drying cycles. The breakage characteristics of rock grains, especially slate rock grains, were studied, showing that the crushing strength and fracture energy decrease with increasing wetting-drying cycles, More small fragments are produced for highly deteriorated grains. Expansion of micropores and cracks, as well as changes in mineral composition content, were also observed.
ROCK MECHANICS AND ROCK ENGINEERING
(2021)
Editorial Material
Chemistry, Physical
Christopher Hutchinson
Summary: Additively manufactured AlSi10Mg alloy exhibits high fatigue strength, comparable to its tensile strength, especially for micro-sized samples, due to the fine cells in its inherent three-dimensional network acting as cages to restrict damage accumulation.
Article
Construction & Building Technology
Hamdy A. Abdel-Gawwad, Taher A. Tawfik, Pawel Sikora, Mohamed Abd Elrahman
Summary: This paper focuses on synthesizing alkali-activated binders using magnesium carbonate as the precursor. The study found that different alkali sources have a significant impact on the composition and compressive strength of the final product. The effects of adding a silicate source and lead glass sludge on the properties of the binder were also investigated. The results showed that the performance of the binder can be controlled by using different alkali sources and additives.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Pingping He, Sarra Drissi, Xiang Hu, Jianhui Liu, Caijun Shi
Summary: The synergistic effect of fly ash (FA) and ground granulated blast furnace slag (GGBS) on the early compressive strength and microstructure development of CO2-cured mortars was investigated. It was found that a rim containing silica-rich gel and crystal calcium carbonate was formed around carbonated cement particles. The shape and crystallinity of calcite formed on FA and GGBS particles were different. The incorporation of FA and GGBS increased the content of calcite and polymerization of silica-rich gel, but did not result in higher compressive strength due to the looser microstructure and nanopores in the carbonation products.
CEMENT & CONCRETE COMPOSITES
(2023)
Article
Construction & Building Technology
Hui He, Huagang Zhang, Jiaojiao Yang, Zongyuan Fan, Wei Chen
Summary: In this study, a straw/sawdust-magnesium oxychloride cement composite (SMOCC) was prepared using compression molding with straw, sawdust, and magnesium oxychloride cement as the main raw materials. The effects of pressing pressure on the mechanical properties, pore structure, and water resistance were investigated. The results showed that increasing the pressing pressure improved the strength of SMOCC and refined its pore structure. However, the water resistance of SMOCC still needs further enhancement.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Chemistry, Physical
Chengyi Dan, Yuchi Cui, Yi Wu, Zhe Chen, Hui Liu, Gang Ji, Yakai Xiao, Han Chen, Mingliang Wang, Jun Liu, Lei Wang, Yang Li, Ahmed Addad, Ying Zhou, Siming Ma, Qiwei Shi, Haowei Wang, Jian Lu
Summary: A fatigue resistance phenomenon has been observed in nano-TiB2-decorated AlSi10Mg alloy produced by additive manufacturing. The three-dimensional dual-phase cellular nanostructure of this alloy acts as a volumetric nanocage, preventing localized damage accumulation and fatigue crack initiation. The fatigue strength of this alloy is close to its tensile strength and surpasses that of other additive manufacturing Al alloys and high-strength wrought Al alloys.
Article
Materials Science, Multidisciplinary
Manuel F. Azamar, Brenda J. Hernandez, Ignacio A. Figueroa, Gonzalo Gonzalez, Omar Novelo-Peralta, Carlos D. Ramos
Summary: Aluminum and Al-4.5Cu wt% open-cell foams were produced using replication casting technique in two different pore sizes without subsequent heat treatments. The addition of Cu significantly increased plastic collapse and plateau stresses, as well as energy absorption capacity of the foams. These enhancements were attributed to the microstructure formed by dendritic arrangement of alpha-Al and theta-Al2Cu.
JOURNAL OF MATERIALS RESEARCH
(2021)
Article
Pharmacology & Pharmacy
Shashwat Gupta, Thamer Omar, Fernando J. Muzzio
Summary: A better understanding of a pharmaceutical tablet's microstructure is important for unlocking the relationship between material attributes, process parameters, and critical quality attributes. This study compared results obtained from different tablet surface preparation methods for determining the microstructure of commercial zinc sulfate tablets using SEM/EDX and RCI. The discussion included a comparison of advantages and disadvantages of SEM/EDX and RCI, as well as common errors in analyzing microstructure.
INTERNATIONAL JOURNAL OF PHARMACEUTICS
(2022)
Article
Energy & Fuels
Anderson Azevedo Agra, Anderson Nicolodi, Bruno Deves Flores, Ismael Vemdrame Flores, Guilherme Lizeiro Ruggio da Silva, Antonio Cezar Faria Vilela, Eduardo Osorio
Summary: The microstructure of coke plays a crucial role in its strength, but characterizing it in a representative way is a complex challenge due to the high heterogeneity of coke.
Article
Construction & Building Technology
Long Yuan, Jingping Qiu, Zhenbang Guo, Shiyu Zhang, Xiaojun Wan, Xiaogang Sun
Summary: Blast furnace slag (BFS) is used as a cement replacement material to improve microstructure and mechanical properties. Optimizing the content of BFS is crucial for maintaining the composite's mechanical properties. Modelling the microstructure of BFS-cement based material and conducting simulations and experiments help understand the material's behavior and achieve optimal mechanical properties.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Chemistry, Applied
Vladimir V. Poborchii, Vitalii P. Petranovskii, Igor A. Glukhov, Andrei A. Fotiadi
Summary: Recently, LTA-Se(1-8) samples with 1-8 Se atoms per cavity were obtained via adsorption at about 450 degrees C, and it was found that single Se-8 or Se-12 rings were formed in the large LTA cavities. In this study, LTA-Se(17) was successfully encapsulated using Se vapor adsorption at around 550 degrees C, and double Se8-ring cluster formation was observed in most of the LTA large cavities, indicating progress towards cluster crystal fabrication. The presence of luminescent Se-2(-) anions in LTA-Se(17) suggests its potential as a novel light-emitting material.
MICROPOROUS AND MESOPOROUS MATERIALS
(2023)
Article
Materials Science, Ceramics
Bilyaminu Suleiman, Hongtao Zhang, Yulong Ding, Yongliang Li
Summary: This study presents a new innovative approach to fabricate porous alumina ceramics using cold sintering process (CSP) with NaCl as pore forming agent. The effects of CSP and post-annealing temperature on the microstructure and mechanical strength were investigated. The results showed that the annealing process resulted in the formation of a porous Al2O3 structure, with a decrease in porosity and an increase in hardness and mechanical strength as the annealing temperature increased. BET analysis revealed a complex pore structure with micropores, mesopores, and macropores.
CERAMICS INTERNATIONAL
(2022)
Article
Construction & Building Technology
Keisuke Takahashi, Shingo Asamoto, Makoto Babazono, Yoshinori Matsuda
Summary: The study found that adding water-dispersible polyurethane polymer helps reduce water uptake of cementitious materials by hydrophobizing and blocking submillimeter and capillary pores. However, due to the similar volumes of micro- and mesopores in specimens with and without the polymer, they exhibited similar water vapor uptakes.
CEMENT & CONCRETE COMPOSITES
(2022)
Article
Engineering, Chemical
Sachida Nanda Sahu, Surendra K. Biswal
Summary: By using cow dung as a replacement, the physical and metallurgical characteristics of hematite iron ore pellets can be maintained for sustainable production; Various techniques were used in the experiment to characterize the pellet quality; Cow dung can be utilized as a renewable carbon resource for cleaner production of hematite iron ore pellets.