Research On The Excavated Waterlogged Wood Treated By Lactitol

The research is part of the subject, which is submitted to the "research on new type of solidifying material and deterioration mechanism of wooden cultural relic by Nanjing museum and Nanjing Forestry University. The paper includes 5 parts, those are: 1. Study on the chemical and physical characteristic of waterlogged archaeological wood; 2. The influence of different degree of degradation and wood species upon the diffusibility of the lactitol.3. Study on the diffusibility of the lactitol in the radial, tangential and longitudinal direction of the waterlogged archaeological wood. 4. Research on the diffusibility of gradient concentration of lactitol solution in the unearthed waterlogged wood; 5. Rresearch on the stability of waterlogged wood treated by gradient concentration of lactitol solution.(1) Study the chemical and physical characteristic of waterlogged archaeological wood, such as moisture content, shrinkage efficiency, relative density, chemical constituent and analysis of the degradation of wood by FTIR instrument. The results shows, the original moisture content and shrinkage efficiency change in a large range according to the degree of degradation and wood species. The original moisture content range between 146. 37% and 1193. 78%, and the shrinkage efficiency on the radial, tangential, longitudinal and cubic respectively range between 6.36% and 45.79%, 12.98% and 75.90%, 0.52 % and 18.98% ,18.06% and 91.25%.the correlation between the original moisture content, shrinkage efficiency, relative density and degree of the degradation of waterlogged wood is apparent, the more severe the degradation of wood is, the higher the saturated moisture content of the wood and the smaller the relative density are; when air-dried, the moisture content and rate of shrinkage of wood changes rapidly. The shrinkage begins with the evaporation of free water, which runs against the principle of the fibre saturation point. The chemical constituent analysis shows: the l%NaOH extractive of waterlogged wood increases with the increase in the degree of the wood degradation, whereas the content of holocellulose reduces. FTIR analysis showed: the cellulose and hemicellulose of the waterlogged wood have degraded severely, and lignin partly degraded as well, new absorbance apex appears in the FTIR spectra of the degraded wood.(2) The difference among all the species is apparent during the treatment with the 50% concentration of lactitol solution. Wood species remarkablely influence the diffusibility of the lactitol in the wood. Even though the wood degraded seriously, the diffusibility of the lactitol in the wood isn't high all to nothing. But to the same wood species, the higher the degree of wood degradation is, the better the diffusibility of the wood is. The diffusibility of lactitol in the wood is not only evaluated by the degree of wood degradation. The diffusibility of the lactitol in the waterlogged archaeological wood is the same as in the common wood. Such as the longitudinal better than the traverse direction and the radial better than tangential direction.