Abstract
The tricalcium silicate (C3S) paste with high electromagnetic transmission performance is prepared by addition of nanocrystalline cellulose (NCC), and the enhancement mechanism of electromagnetic transmission performance is revealed. The water to cement ratio (W/C) and the contents of NCC are 0.5 and 1 wt%-4wt%, respectively. The results show that the electromagnetic transmissivity of the C3S paste improves with an increase in NCC content. At the frequency of 3.94 GHz, when the NCC contents are 3 wt% and 4 wt%, the electromagnetic transmission coefficient increases by 113.85% and 153.6%, respectively. The enhancement mechanisms of electromagnetic transmission performance of NCC-C3S pastes are as follows: (1) the polymerization degree of C–S–H and the Van der Waals force between the globules increase; (2) the total volume proportions of low electromagnetic loss C3S and Ca(OH)2 increase; (3) the conductivity of C3S pore solution and the volume proportions of water decrease; (4) the pore volume proportion of the non-harmful pores for electromagnetic energy loss increases.
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