cement composites
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2022 ◽  
Vol 14 (2) ◽  
pp. 784
Author(s):  
Salvatore Polverino ◽  
Antonio Esau Del Rio Castillo ◽  
Antonio Brencich ◽  
Luigi Marasco ◽  
Francesco Bonaccorso ◽  
...  

Cement is the most-used construction material worldwide. Research for sustainable cement production has focused on including nanomaterials as additives to enhance cement performance (strength and durability) in recent decades. In this concern, graphene is considered one of the most promising additives for cement composites. Here, we propose a novel technique for producing few-layer graphene (FLG) that can fulfil the material demand for the construction industry. We produced specimens with different FLG loadings (from 0.05% to 1% by weight of cement) and curing processes (water and saturated air). The addition of FLG at 0.10% by weight of cement improved the flexural strength by 24% compared to the reference (bare) sample. Similarly, a 0.15% FLG loading by weight of cement led to an improvement in compressive strength of 29% compared to the reference specimen. The FLG flakes produced by our proposed methodology can open the door to their full exploitation in several cement mortar applications, such as cementitious composites with high durability, mechanical performance and high electrical conductivity for electrothermal applications.


Silicon ◽  
2022 ◽  
Author(s):  
Van Essa L. Kamga. Samen ◽  
Juvenal Giogetti Deutou Nemaleu ◽  
Rodrigue Cyriaque Kaze ◽  
Franck Docgne Kammogne ◽  
Pierre Meukam ◽  
...  

Author(s):  
Izabela Klapiszewska ◽  
Łukasz Ławniczak ◽  
Anna Parus ◽  
Teofil Jesionowski ◽  
Łukasz Klapiszewski ◽  
...  
Keyword(s):  

2022 ◽  
Vol 317 ◽  
pp. 125830
Author(s):  
Nam Kon Lee ◽  
Million Tafesse ◽  
Hyo Kyoung Lee ◽  
Abel Shiferaw Alemu ◽  
Sung Wook Kim ◽  
...  

2022 ◽  
Vol 151 ◽  
pp. 106619
Author(s):  
M. Shishehbor ◽  
D. Sakaniwa ◽  
D. Stefaniuk ◽  
K.J. Krakowiak ◽  
M.J. Abdolhosseini Qomi

2022 ◽  
Vol 317 ◽  
pp. 125931
Author(s):  
Sara Dias ◽  
João Almeida ◽  
Bruna Santos ◽  
Pedro Humbert ◽  
António Tadeu ◽  
...  

Materials ◽  
2021 ◽  
Vol 15 (1) ◽  
pp. 262
Author(s):  
Shankar A. Hallad ◽  
Nagaraj R. Banapurmath ◽  
Avinash S. Bhadrakali ◽  
Arun Y. Patil ◽  
Anand M. Hunashyal ◽  
...  

The development of radiation attenuation materials with lean cross-sections is the need of the hour. However, the inherent threat of radiations accompanying these processes is of major concern. Thus, in an attempt to shield unnecessary radiations, several novel materials have been fabricated alongside the conventional materials available. Yet, there is a need for cost-effective, efficient shielding materials that have good mechanical strength and effective shielding properties. The present work investigates ceramic composite behaviors and radiation shielding capacity reinforced with lead oxide nano-powder. Developed nano-lead-based cement composites were subjected to mechanical tests to determine flexural and compressive strengths to check their suitability for structural applications. Further, the gamma attenuation test of the composites was conducted to determine their neutron absorption capacity. The addition of nano-leadoxide in the control beams was varied from 0.7 to 0.95 and 1 wt.% of the ceramic matrix. The percentage of nano-leadoxide that gives the best results in both enhanced properties and economic aspects was determined to be 0.6 wt.% of the cement.


2021 ◽  
Vol 15 ◽  
Author(s):  
Adriana Estokova ◽  
Martina Kovalcikova

Background: Cementitious composites, which are subject to increasing demands, are often exposed to various external attacks, such as aggressive groundwater and surface water, chemicals in the soil, gas penetration, or phenomena related to water freezing and melting. One of the most common reasons for the deterioration of cement composites is the corrosion process. Corrosion results in irreversible damage that occurs during the chemical reaction of the material with the components of the environment. Methods: The paper deals with experimental study of chemical sulphate corrosion of cement composites prepared from three types of cement: ordinary Portland cement; sulphate-resistant cement; and special hybrid cement, and industrial by-products and wastes: silica fume, zeolite and a special mineral admixture based on blast furnace granular slag as cement partial substitutes. Samples of cement composites were subjected to corrosion experiments in a sulphate environment, which took place in the laboratory under model conditions for 180 resp. 270 days. Results: The deterioration parameters: changes in the weight and thickness of the samples, surface and mineralogical changes, leachability of the basic components of the cement matrix as well as changes in the liquid phase proved the degradation process due to chemical sulphate corrosion, model solutions of H2SO4 with pH 3 and 4, and solution of MgSO4 with c (SO4 2 - ) = 3 and 10 g /L. Conclusion: By comparing the leachability of the alkali components from cement composites, it can be concluded that for the most aggressive model solution (H2SO4 with pH 3), both slagcontaining formulations are the most stable in terms of the total ratio of leached calcium and silicon. This finding is also supported by the results of water absorbency tests, which confirmed that despite the increase in absorbency after chemical corrosion, cement composites with slag content reach the lowest values.


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