Development of cement nanocomposites reinforced by carbon nanotube dispersion using superplasticizers

An, Seok Hwan; Kim, Ki Yun; Chung, Chul Woo; Lee, Jea Uk

doi:10.1007/s42823-024-00714-4

Cited by 4 publications

(3 citation statements)

References 55 publications

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“…Our previous studies confirmed that the measurement of the contact angle between graphene dispersions and cement plates serves as an indicator of the interfacial affinity between the two materials and the effect of rPCE [28]. As a consequence of the lack of hydrophilic functional groups on the surface of pristine graphene, the formation of an aqueous dispersion was unattainable, thus precluding the measurement of the contact angle with cement plate (Supplementary Figure S2) [1,20].…”

Section: Contact Angle Measurementssupporting

confidence: 67%

“…In the case of the G/PCE 1:1 dispersion, the contact angle with the cement plate was notably lower (22.64 • ) than that of the G/PCE C1 (27.48 • ) and G/PCE C2 (27.61 • ) dispersions. Recognizing that a lower contact angle signifies a higher interfacial affinity between graphene dispersions and cement plate, the observed low contact angle of G/PCE 1:1 suggests that rPCE effectively contributes to improving the interfacial affinity between graphene and cement [28]. This phenomenon can be interpreted in two ways.…”

Section: Contact Angle Measurementsmentioning

confidence: 98%

“…The average contact angle between the dispersion and the cement plate was determined by repeatedly dropping 1.5 µL G/PCE droplets onto the cement surface, which was accomplished using the Phoenix 300 (SEO Co., Ltd., Suwon, Republic of Korea). Previous research has established that a lower contact angle between the G/PCE dispersion and the cement plate corresponds to a higher interfacial affinity [28].…”

Section: Contact Angle Measurementmentioning

confidence: 98%

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Study on the Effect of Residual Polymer Superplasticizer on the Properties of Graphene–Cement Composites

Kim,

An,

Lee

2024

Polymers

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Graphene, renowned for its exceptional mechanical, thermal, and electrical properties, is being explored as a cement nanofiller in the construction field. However, the limited water dispersibility of graphene requires the use of polymer superplasticizers, such as polycarboxylate ether (PCE). Previous studies have investigated the mechanisms by which PCE facilitates the dispersion of graphene within cement nanocomposites. However, such studies have made minimal progress, indicating a lack of understanding of the effect of residual PCE (rPCE) remaining in aqueous solution without binding to graphene. In this study, the effects of rPCE on the dispersion of graphene and the mechanical properties of graphene–cement composites (GCCs) were systematically analyzed. For this purpose, the content of rPCE was accurately measured through the centrifugation process and thermal analysis of graphene dispersion with PCE, and the result was 78.0 wt.% compared to graphene. The optical microscopy, particle size analysis, and contact angle measurement of the graphene dispersions with and without rPCE confirmed that rPCE is crucial for the dispersion of graphene and the enhancement of the interfacial affinity between graphene and cement. Additionally, the compressive strength of GCC with rPCE exhibited a substantial enhancement of approximately 10% (68.36 MPa) compared to plain cement (62.33 MPa). The effectiveness of rPCE in enhancing compressive strength correlated with the uniform dispersion of graphene within GCC and the promotion of cement hydration, as evidenced by field emission scanning electron microscopy and X-ray diffraction, respectively.

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Section: Contact Angle Measurementssupporting

confidence: 67%

Section: Contact Angle Measurementsmentioning

confidence: 98%

Section: Contact Angle Measurementmentioning

confidence: 98%

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