Visual evaluation of warehousing humidity and time on bamboo performance

Abstract

The inventories of Moso bamboo (Phyllostachys pubescens) resources are considered to be one of the most important strategic resources for economic construction and ecological building materials. Warehousing humidity is one of the objective factors that induce mold deterioration and quality deterioration of bamboo. To investigate the effect of environment humidity on the use value of bamboo, humidity levels of 45 %, 60 %, 75 % and 95 % and indoor environments were artificially simulated and regularly monitored for changes in quality during warehousing. During the 56-day storage period, with the increase of humidity in the warehousing environment, the dimensional expansion rate of the cortex side of bamboo was larger than that of the pith side and the cavity diameter ratio gradually decreased, Total color difference value, and mass density loss rate gradually decreased, and the peak compressive stress-strain displacement gradually increased, respectively. 95 % RH is beneficial to mold reproduction and only infect the surface, Fourier Transform Infrared Spectroscopy analysis showed that the quality changes during storage were more related to the decrease in the signal peak of the hemicellulose functional group of the material itself accompanied by the degradation of various monosaccharides, the lignin functional group corresponded to the decrease in L* and Total color difference, and the degree of pyrolysis tolerance was inversely proportional to the signal intensity of the cellulose functional group. Redundancy analysis showed that the positive contribution of humidity in the storage environment to the physical quality of bamboo was Bamboo pith linear > Width dimension > Bamboo cortex linear > Water content > Weight loss rate > Length Dimension > a*, and the storage time was closely related to the L* value and compression strength.