Wpływ stosunku wodno-cementowego na właściwości elektryczne wielofunkcyjnych kompozytów cementowych

Frąc, Maksymilian; Szołdra, Paulina; Pichór, Waldemar

doi:10.32047/CWB.2025.30.1.4

Artykuł - szczegóły

Tytuł artykułu

Wpływ stosunku wodno-cementowego na właściwości elektryczne wielofunkcyjnych kompozytów cementowych

Autorzy

Frąc Maksymilian , Szołdra Paulina , Pichór Waldemar

Wybrane pełne teksty z tego czasopisma

http://www.cementwapnobeton.pl/

Identyfikatory

DOI

10.32047/CWB.2025.30.1.4

Warianty tytułu

Influence of water-cement ratio on electrical properties of smart cement composites

Języki publikacji

PL EN

Abstrakty

W niniejszej pracy przedstawiono wyniki badań dotyczących wpływu stosunku wodno-cementowego [w/c] na właściwości elektryczne kompozytów cementowych z grafitem ekspandowanym [EG]. Analizie poddano próbki zawierające od 2% do 6% EG, przy stosunkach w/c w zakresie od 0,40 do 0,60. Badania obejmowały pomiary rezystywności metodą czteropunktową, spektroskopię impedancyjną, a także ocenę właściwości termoelektrycznych i samonagrzewających kompozytów. Uzyskane wyniki wskazują, że zwiększenie stosunku w/c prowadzi do obniżenia przewodnictwa elektrycznego badanych kompozytów, niezależnie od zawartości dodatku EG. Analiza widm impedancyjnych wykazała, iż w rozpatrywanym zakresie w/c, próg perkolacji zostaje przekroczony w przypadku kompozytów zawierających powyżej 4% EG. Im wyższa zawartość EG tym przy wyższym w/c próg perkolacji jest przekroczony. Istotną obserwacją jest kształt widma Nyquista dla kompozytów znajdujących się w zakresie perkolacji - słabo wykształcone półokręgi. Im bliżej progu perkolacji znajduje się kompozyt, tym mniej wyraźnie wykształcony jest półokrąg. Taki charakterystyczny kształt widma umożliwia określenie zawartości dodatku przewodzącego w zakresie perkolacji. Dodatkowo, wyniki badań potwierdzają wpływ stosunku w/c na właściwości samonagrzewające analizowanych kompozytów cementowych. Natomiast w/c wydaje się nie wpływa na wartość współczynnika Seebecka powyżej progu perkolacji. Uzyskane rezultaty jednoznacznie wskazują na istotną rolę zarówno stosunku wodno-cementowego w kształtowaniu właściwości funkcjonalnych tych materiałów.

This study presents the results of research on the influence of the water-to-cement ratio [w/c] on the electrical properties of cement composites with expanded graphite [EG]. The analysis was conducted on samples containing 2 % to 6 % EG, with w/c ratios ranging from 0.40 to 0.60. The experimental program included four-point probe resistivity measurements, impedance spectroscopy, as well as evaluation of the thermoelectric and self-heating properties of the composites. The results indicate that increasing the w/c ratio leads to a reduction in the electrical conductivity of the studied composites, regardless of the EG content. Impedance spectra analysis showed that, within the investigated w/c range, the percolation threshold is exceeded in composites containing more than 4 % EG. The higher the EG content, percolation threshold is exceeded at higher w/c. An important observation is weakly formed semicircles in Nyquist plot for composites in the percolation zone. The closer conductivity of the composite is to the percolation threshold, the less distinct the semicircle. This characteristic spectrum shape allows for the determination of the conductive additive content in the percolation zone. Furthermore, the findings confirm that the w/c ratio significantly influences the self-heating properties of the investigated cement composites. In contrast, the w/c ratio does not appear to affect the magnitude of the Seebeck coefficient above the percolation threshold. The obtained results clearly indicate the significant role of water-to-cement ratio in shaping the functional properties of these materials.

Słowa kluczowe

stosunek wodno-cementowy smart kompozyt cementowy przewodnictwo elektryczne

water-cement ratio smart electrical properties cement composite

Wydawca

Fundacja Cement, Wapno, Beton

Czasopismo

Cement Wapno Beton

Rocznik

2025

Tom

R. 30, nr 1

Strony

57--74

Opis fizyczny

Bibliogr. 47 poz., il.

Twórcy

autor

Frąc Maksymilian

frac@agh.edu.pl

Department of Building Materials Technology, Faculty of Materials Science and Ceramics, AGH University of Krakow, Krakow, Poland

autor

Szołdra Paulina

Faculty of Space Technologies, AGH University of Krakow, Krakow, Poland

autor

Pichór Waldemar

Faculty of Space Technologies, AGH University of Krakow, Krakow, Poland

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