Retraction

Sharma, U.; Singh, Latika; Ali, Dilshad; Poon, Chi Sun

doi:10.1520/acem20190007

Cited by 9 publications

(7 citation statements)

References 39 publications

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“…An opposite change pattern was shown in 1 h water absorption which decreased as a whole, from 9.72% to 7.21%. Such phenomenon has been explained by previous studies 25 that SiO 2 played both roles in fine particle properties and great volcanic activity, which could provide more nucleation sites, promoting hydration reaction and generating more hydration products. Limited by the content of hydration raw materials, the weak positive effect of excessive SiO 2 on hydration reaction corresponded to a continued increase in SiO 2 content from 27% to 37% with only a small increase in compressive strength.…”

Section: Resultsmentioning

confidence: 69%

Effect of oxides composition on the mechanical properties of non‐sintered spherical filters from waste steel slag

Yan

Shen

Lin³

et al. 2022

Env Prog and Sustain Energy

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Non-sintered spherical filters (NSSFs) from the waste steel slag for bottom filtration process are regarded as promising materials for sustainable development with economical benefits due to saving natural resource pebbles. To further optimize the preparation process, the influence mechanism of the main oxides on characteristics are comprehensively examined in this work. CaO in the raw materials makes it easier to release active components from the resulting glass body structure, while the expansion stress of Ca(OH) 2 crystals precipitated under highly basic circumstances needs special consideration. SiO 2 can positively contribute to the properties due to its adequate participation in the hydration reaction and the micro-aggregate effect.Al 3+ tends to combine and form a stable tetrahedral structure, which is conducive to liquid viscosity and the hindrance of hydration reaction of the active substance.Under the 6% mass ratio of MgO, NSSFs exhibit relatively excellent in physical properties. Specifically, the stimulation and promotion effect of MgO on hydration reaction is superior to the negative effect of excessive product Mg(OH) 2 on expansion stress. Fe 2 O 3 particles convert the structure in NSSFs to a dense state by the filling effect and serving as nucleation sites to promote the formation of hydration products.

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Section: Resultsmentioning

confidence: 69%

Effect of oxides composition on the mechanical properties of non‐sintered spherical filters from waste steel slag

Yan

Shen

Lin³

et al. 2022

Env Prog and Sustain Energy

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“…Oferuje ona poszerzenie wiedzy i fi zykochemicznego zrozumienia reakcji i mikrostruktury betonu, a także poprawę jakości istniejących betonów i związanych z tym metod realizacji z wykorzystaniem nowych materiałów w nanoskali, w tym z nanocząstkami (6)(7)(8)(9). Biorąc pod uwagę uwodniony cement i obecność w mikrostrukturze zaczynu cementowego nanowymiarowych pustek, zastosowanie nanocząstek może być skuteczne w wypełnianiu niewielkich pustek w zaczynie cementowym i zwiększaniu wytrzymałości betonu (10)(11)(12)(13). Nanomateriały węglowe [NW] skupiają na sobie wiele uwagi, ponieważ nie tylko modyfi kują strukturę i właściwości mechaniczne hydratów cementu w nanoskali, ale także przyczyniają się do rozwoju wielofunkcyjnych kompozytów, takich jak przewodzący, termiczny i samozagęszczalny beton (14)(15)(16)(17)(18)(19)(20).…”

Section: Wprowadzenieunclassified

“…Taking into account the hydrated cement and the presence of nano-sized cavities in its structure, the use of nanoparticles can be effective in fi lling the small cavities in the cement paste and increasing the strength of concrete (10)(11)(12)(13). Carbo nanomaterials [CN S ] have attracted a great deal of attention because they not only modify the structures and mechanical properties of cement hydrates at the nanoscale, but also contribute to the development of multipurpose composites such as conductive, thermal, and self--compacting concrete (14)(15)(16)(17)(18)(19)(20).…”

Section: Introductionmentioning

confidence: 99%

Investigating the mechanical properties and durability indices of concrete containing Fe3O4/SiO2/GO and GO nanoparticles

et al. 2021

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Recent research in the construction industry justifi es the partial replacement of cement by nanomaterials. Graphene oxide na-nocomposite is a material that has been recently proposed as a suitable alternative for part of cement in concrete. However, there is no research on the addition of these synthetic compounds to concrete, and little is known about the effect of these materials on the mechanical and durability properties of concrete. Therefore, in this laboratory study, the synthesis of Fe3O4/SiO2/GO and GO nanoparticles was performed and confi rmed with FT-IR, SEM, TEM analyses. These nanoparticles partially replaced cement by 1, 2, 3, and 4 % by mass of the cement, and their effect on mechanical and durability properties of concrete at the ages of 7, 28, and 90-day, were investigated. The results suggest that mixtures in which 2% Fe3O4/ SiO2/GO and 3% GO substituted cement yielded the best results in the mechanical properties tests. Concrete containing Fe3O4/SiO2/GO nanoparticles enhanced compressive strength by 14% and splitting tensile strength by 12% after 28-days of curing. Also, concrete containing 2% Fe3O4/SiO2/GO, had the highest re-sistance to an acidic environment, the lowest permeability, and the highest transient pulse velocity in the ultrasonic test, compared to the specimen containing GO nanoparticles and the control sample.

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“…The relationship between these mechanical properties of the C-S-H phase and its packing density has been established, showing that the C-S-H phases exhibit a unique nano-grained (nanogranular) morphology with packing densities that are very close to the ultimate packing densities of spheres; namely, the random close-packed limit (RCP) or maximally random jammed state (MRJ) η = 0.64 [27][28][29] for the LD C-S-H phase; and ordered packing of two types: hexagonal or face-centered cubic, equal by Gauss's theorem, [30][31][32] for the HD C-S-H phase. In this model, it is assumed that the porosity of the C-S-H phase gel is not constant, it depends on the volumetric proportions LD C-S-H (f LD ) and HD C-S-H (f HD ):…”

Section: Introductionmentioning

confidence: 99%

Structure Formation of C-S-H From the Position of Micromechanics of Composite Media

Fediuk

Yoo

2021

Construction Materials and Products

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the creation of an environmentally friendly building material to protect the human environment can only be carried out from the position of a transdisciplinarity approach, taking into account modern achievements in geomimetics and micromechanics of composite media. A wide range of basalt-fiber-reinforced concrete based on composite binders has been developed, which have increased characteristics of impermeability and durability under extreme operating conditions. The nature of the influence of the composition and manufacturing technology of cement composites on the pore structure of the composite has been established, which has a positive effect on the charac-teristics of gas, water and vapor permeability. High early strength was obtained, which allows the use of materials for operational repair and construction in emergency situations. The positive influence of the composition of the developed composite on the performances has been proved. The water resistance of the modified composite provides a water pressure of 2 MPa for 148 hours, which corresponds to the W18 grade (for the control sample – W8), the frost resistance grade – F300. It was found that the water absorption of the modified concrete samples was lower than that of the control sample, which is explained by the decrease in the pore structure index λ by 28.4 times, and the average pore diameter by 3.05 times. The total pore volume of the modified concrete was lower and decreased with increasing dose of nanosilica.

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Retraction

Abstract: Original Article Title: Effect of Particle Size of Silica Nanoparticles on Hydration Reactivity and Microstructure of C-S-H Gel Original Authors: U. Sharma,1 L. P. Singh,2 D. Ali,1 and C. S. Poon3 This article has been retracted due to duplicate publication. ASTM International August 2021

Cited by 9 publications

References 39 publications

Effect of oxides composition on the mechanical properties of non‐sintered spherical filters from waste steel slag

Effect of oxides composition on the mechanical properties of non‐sintered spherical filters from waste steel slag

Investigating the mechanical properties and durability indices of concrete containing Fe3O4/SiO2/GO and GO nanoparticles

Structure Formation of C-S-H From the Position of Micromechanics of Composite Media

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