|Table of Contents|

Research on mechanical properties and decay resistance mechanism of bamboo scrimber under accelerated decay environment(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2023年03期
Page:
30-39
Research Field:
建筑材料
Publishing date:

Info

Title:
Research on mechanical properties and decay resistance mechanism of bamboo scrimber under accelerated decay environment
Author(s):
CHU Wei1;  XU Ming1;  XU Qi1;  LI Ting1;  CUI Zhaoyan2
(1. Key Laboratory of C&PC Structures, Ministry of Education, Southeast University, Nanjing 211189, Jiangsu, China; 2. National-provincial Joint Engineering Research Center of Electromechanical Product Packaging, Nanjing Forestry University, Nanjing 210037, Jiangsu, China)
Keywords:
bamboo scrimber;  weight loss rate;  mechanical property;  scanning electron microscopy;  decay resistance
PACS:
TU531.3
DOI:
10.19815/j.jace.2021.10099
Abstract:
Bamboo scrimber is a new type of engineering material, which has good mechanical properties. To quantitatively evaluate the decay resistance of the bamboo scrimber, methods including visual analysis, weight loss rate analysis, mechanical property analysis, and scanning electron microscopy analysis were used in the study of the decay resistance of the bamboo scrimber. The results show that after the 84 d corrosion of the brown-rot fungi and white-rot fungi, only slight decay on the surface of the bamboo scrimber samples occurred. The brown-rot and white-rot have little difference in weight loss rate, and both are less than 10%, which shows that the bamboo scrimber belong to grade Ⅰ decay resistance. The elastic modulus of bending ME and bending strength MR of brown-rot specimens decrease by 5.17% and 8.17% respectively, while the compressive strength U remains basically unchanged. By contrast, the ME, MR and U of the white-rot specimens decrease 10.56%、13% and 0.45% respectively, which is far less than that of wood. Scanning electron microscopy analysis shows that after 84 d decay, the thin-walled cells of moso bamboo are filled with hyphae and numerous pores appeared on the cell walls, while only a small amount of hyphae present in the thin-walled cells within 2 mm of the surface of the bamboo scrimber, and no damage to the cell walls occurs during the 84 d experiment. Although the conditions for survival of wood-decaying fungi can be met inside bamboo, the reduction in water absorption during processing such as disintegration, carbonization, impregnation, and reconstitution limits the moisture required for fungal growth, hindering the invasion of wood-decaying fungi into the bamboo scrimber. Additionally, phenolic resins exhibit some antibacterial properties, making bamboo scrimber a durable material with high decay resistance.

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Last Update: 2023-05-20