Fig. 1. EDS spectrum of modified Chinese fir cell cavity filling
(a): SEM image of modified Chinese fir and scan area; (b): Content of main elements; (c): Distribution of main elements

Fig. 2. The XPS full spectrum scan spectrum of Chinese fir material and modified Chinese fir

Fig. 3. FTIR spectra measurement results
(a): Natural Chinese fir and modified Chinese fir; (b): Sodium silicate solution and leachiog solution

Fig. 4. XPS spectrum of C and O elements of Chinese fir
(a): C element peak spectrum of natural Chinese fir; (b): O element peak spectrum of natural Chinese fir;(c): C element peak spectrum of modified Chinese fir; (d): O element peak spectrum of modified Chinese fir

Fig. 5. XPS spectra of Si and Mg elements in modified Chinese fir