Effect of graphene oxide on microstructure and strengthened properties of fly ash and silica fume based cement composites

Indukuri, Chandra Sekhar Reddy; Nerella, Ruben; Madduru, Sri Rama Chand

doi:10.1016/j.conbuildmat.2019.116863

Cited by 89 publications

(26 citation statements)

References 25 publications

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“…Furthermore, the addition of GO also resulted in a noticeable increment in compressive strength. It is believed that the presence of GO forms flower-like shaped hydration crystals, and this causes the dispersion of all cement particles in void spaces, resulting in the enhancement of not only flexural but also compressive strength [ 31 ].…”

Section: Resultsmentioning

confidence: 99%

Deformation Properties of Rubberized ECC Incorporating Nano Graphene Using Response Surface Methodology

et al. 2020

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Engineered cementitious composite (ECC) was discovered as a new substitute of conventional concrete as it provides better results in terms of tensile strain, reaching beyond 3%. From then, more studies were done to partially replace crumb rubber with sand to achieve a more sustainable and eco-friendlier composite from the original ECC. However, the elastic modulus of ECC was noticeably degraded. This could bring potential unseen dangerous consequences as the fatigue might happen at any time without any sign. The replacement of crumb rubber was then found to not only bring a more sustainable and eco-friendlier result but also increase the ductility and the durability of the composite, with lighter specific gravity compared to conventional concrete. This study investigated the effects of crumb rubber (CR) and graphene oxide (GO) toward the deformable properties of rubberized ECC, including the compressive strength, elastic modulus, Poisson’s ratio, and drying shrinkage. Central composite design (CCD) was utilized to provide 13 reasonable trial mixtures with the ranging level of CR replacement from 0–30% and that of GO from 0.01–0.08%. The results show that GO increased the strength of the developed GO-RECC. It was also found that the addition of CR and GO to ECC brought a notable improvement in mechanical and deformable properties. The predicted model that was developed using response surface methodology (RSM) shows that the variables (compression strength, elastic modulus, Poisson’s ratio, and drying shrinkage) rely on the independent (CR and GO) variables and are highly correlated.

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Section: Resultsmentioning

confidence: 99%

Deformation Properties of Rubberized ECC Incorporating Nano Graphene Using Response Surface Methodology

et al. 2020

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“…The cement-based materials can be mixed with nanomaterials such as nano-silica (nano-SiO 2 ), nano-alumina (nano-Al 2 O 3 ), nano-ferric oxide (nano-Fe 2 O 3 ), nano-titanium oxide (nano-TiO 2 ), carbon nanotubes (CNTs), graphene and graphene oxide. In recent years, several researchers [29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49] have studied the incorporation of nanomaterials into cement-based materials. The mixture of cementitious composites and nanomaterials can increase the mechanical strength of the resulting concrete structures.…”

Section: Introductionmentioning

confidence: 99%

Recent Progress in Nanomaterials for Modern Concrete Infrastructure: Advantages and Challenges

et al. 2019

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Modern concrete infrastructure requires structural components with higher mechanical strength and greater durability. A solution is the addition of nanomaterials to cement-based materials, which can enhance their mechanical properties. Some such nanomaterials include nano-silica (nano-SiO2), nano-alumina (nano-Al2O3), nano-ferric oxide (nano-Fe2O3), nano-titanium oxide (nano-TiO2), carbon nanotubes (CNTs), graphene and graphene oxide. These nanomaterials can be added to cement with other reinforcement materials such as steel fibers, glass, rice hull powder and fly ash. Optimal dosages of these materials can improve the compressive, tensile and flexural strength of cement-based materials, as well as their water absorption and workability. The use of these nanomaterials can enhance the performance and life cycle of concrete infrastructures. This review presents recent researches about the main effects on performance of cement-based composites caused by the incorporation of nanomaterials. The nanomaterials could decrease the cement porosity, generating a denser interfacial transition zone. In addition, nanomaterials reinforced cement can allow the construction of high-strength concrete structures with greater durability, which will decrease the maintenance requirements or early replacement. Also, the incorporation of nano-TiO2 and CNTs in cementitious matrices can provide concrete structures with self-cleaning and self-sensing abilities. These advantages could help in the photocatalytic decomposition of pollutants and structural health monitoring of the concrete structures. The nanomaterials have a great potential for applications in smart infrastructure based on high-strength concrete structures.

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“…The advantage of the amount of heat released decreases with time, and practically shows a difference of only 1.4 J/g or 0.6% after 3 days of reaction. The results obtained in the tests carried out with the The results shown in Figure 10 and Table 4 illustrate the practically comparable reactivity of R-MUD with the well tested and very active admixture of silica fume [56][57][58][59]. This can be seen even if we try to estimate the effect of the initially very high reactivity, because during the first half hour more than twice as much heat is released from the cement and R-MUD mixture than from the cement and silica fume mixture.…”

Section: Calorimetric Test Resultsmentioning

confidence: 70%

“…The results shown in Figure 10 and Table 4 illustrate the practically comparable reactivity of R-MUD with the well tested and very active admixture of silica fume [ 56 , 57 , 58 , 59 ]. This can be seen even if we try to estimate the effect of the initially very high reactivity, because during the first half hour more than twice as much heat is released from the cement and R-MUD mixture than from the cement and silica fume mixture.…”

Section: Resultsmentioning

confidence: 74%

Undissolved Ilmenite Mud from TiO2 Production—Waste or a Valuable Addition to Portland Cement Composites?

2020

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This paper presents a method of utilising ilmenite MUD created during the production of titanium dioxide (TiO2) according to the sulphate method as an additive for Portland cement composites. After the production process, undissolved MUD was additionally rinsed with water and filtrated in the factory to make it more useful (R-MUD) for implementation and also to turn back some of the by-products of the production of TiO2. R-MUD is less hazardous waste than MUD. It has a lower concentration of sulphuric acid and some heavy metals. The rinsing process raised the concentration of SiO2, which is a valuable part of R-MUD because of its potential pozzolanic activity. This means that the R-MUD might be a reactive substitute of part of Portland cement in building composites. The article presents the results of research on the pozzolanic activity of R-MUD and other materials with proved pozzolanic activity, such as silica fume, fly ash and natural pozzolana (trass). Tests were performed using thermal analysis techniques. The tests showed that the pozzolanic activity or R-MUD after three days is at the same level as silica fume and after 28 days it is twice as high as the activity of fly ash. Beyond the 180th day of curing, R-MUD had the same level of activity as fly ash. The summary is supplemented by calorimetric tests, which confirm the high reactivity of R-MUD compared to other commonly used concrete additives, already in the initial hydration period. In summary, heat of hydration after 72 h of Portland cement with R-MUD is at the same level as the heat of hydration of Portland cement with silica fume and also pure Portland cement grout. The results confirm that the process of formation of micro-silica contained in R-MUD react with calcium hydroxide to form the C-S-H phase, which is responsible for the microstructure of cement composites.

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Effect of graphene oxide on microstructure and strengthened properties of fly ash and silica fume based cement composites

Cited by 89 publications

References 25 publications

Deformation Properties of Rubberized ECC Incorporating Nano Graphene Using Response Surface Methodology

Deformation Properties of Rubberized ECC Incorporating Nano Graphene Using Response Surface Methodology

Recent Progress in Nanomaterials for Modern Concrete Infrastructure: Advantages and Challenges

Undissolved Ilmenite Mud from TiO2 Production—Waste or a Valuable Addition to Portland Cement Composites?

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