Effect of selected organic additives on the properties of magnesia-chromite refractories

Goldmann, Eryk; Kostrzanowska–Siedlarz, Aleksandra; Górski, Marcin; Klemczak, Barbara

doi:10.32047/cwb.2022.27.4.4

Cited by 1 publication

(1 citation statement)

References 6 publications

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“…The basic properties of Nanocyl NC7000 multi-walled carbon nanotubes are listed in Table 4. The suspension was prepared in distilled water with a naphthalene-based superplasticizer, which was found to be the best for ensuring a homogeneous suspension of carbon nanotubes [32]. In detail, a specified amount of MWCNTs (Table 5) was added to 100 g of distilled water and a constant amount of 4.5 g of naphthalene-based superplasticizer.…”

Section: Methodsmentioning

confidence: 99%

Effects of Multi-Walled Carbon Nanotube Dosages and Sonication Time on Hydration Heat Evolution in Cementitious Composites

Klemczak,

Goldmann,

Gołaszewska

et al. 2023

Materials

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This study aimed to investigate the heat generated during the hydration process in cementitious composites containing multi-walled carbon nanotubes (MWCNTs). The cumulative heat release and heat flow of these cementitious composites were measured over a period of 168 h using isothermal calorimetry. Three different MWCNT dosages, 0.05 wt%, 0.1 wt%, and 0.2 wt%, along with two different sonication times for the solution, which were 20 min and 60 min, were applied in the experimental program. The results reveal that the incorporation of MWCNTs and the use of a naphthalene-based superplasticizer to disperse the nanotubes generally led to a reduction in heat emission during the early stages of hydration, a lower first peak value in the initial stage of hydration, and a significant delay in the acceleration period compared with the reference sample lacking this superplasticizer. Furthermore, the results demonstrate that both the dosage of multi-walled carbon nanotubes (MWCNTs) and the sonication time have an impact on the heat emission and hydration process since the same amount of superplasticizer was applied to all pastes. An increase in the MWCNT dosage led to a decrease in the rate of hydration heat at the main peak for all pastes. Additionally, longer sonication times resulted in lower values of heat generated, reduced main peak values in the heat rate evolution, and generally extended delays in the occurrence of the main peak.

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Section: Methodsmentioning

confidence: 99%