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Self-heating function of carbon nanofiber cement pastes

2014; Spanish National Research Council; Volume: 64; Issue: 314 Linguagem: Inglês

10.3989/mc.2014.01713

1988-3226

Ó. Galao, F. Javier Baeza, E. Zornoza, P. Garcés,

Advanced Energy Technologies and Civil Engineering Innovations

The viability of carbon nanofiber (CNF) composites in cement matrices as a self-heating material is reported in this paper.This functional application would allow the use of CNF cement composites as a heating element in buildings, or for deicing pavements of civil engineering transport infrastructures, such as highways or airport runways.Cement pastes with the addition of different CNF dosages (from 0 to 5% by cement mass) have been prepared.Afterwards, tests were run at different fixed voltages (50, 100 and 150V), and the temperature of the specimens was registered.Also the possibility of using a casting method like shotcrete, instead of just pouring the fresh mix into the mild (with no system's efficiency loss expected) was studied.Temperatures up to 138 °C were registered during shotcrete-5% CNF cement paste tests (showing initial 10 °C/min heating rates).However a minimum voltage was required in order to achieve a proper system functioning.