Effects of Freeze-Thaw Cycles on Physical and Mechanical Properties of Glulam Exposed to Outdoor Environment  

作　　者：Ruyuan Yang Haitao Li Assima Dauletbek Mahmud Ashraf Rodolfo Lorenzo Youfu Sun Yuehong Wu 

机构地区：[1]College of Materials Science and Engineering,Nanjing Forestry University,Nanjing,China [2]College of Civil Engineering,Nanjing Forestry University,Nanjing,China [3]University College London,London,WC1E 6BT,UK [4]School of Engineering,Deakin University,Geelong,VIC 3216,Australia

出　　处：《Journal of Renewable Materials》2021年第7期1293-1307,共15页可再生材料杂志（英文）

基　　金：the Natural Science Foundation of Jiang-su Province(Grant No.BK20181402);the National Natural Science Foundation of China(Grant No.51878354);a Project Funded by the National First-class Disciplines(PNFD),a Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD);a Project Funded by the Co-Innovation Center of Efficient Processing and Utilization of Forest Resources,Nanjing Forestry University(Nanjing,China).

摘　　要：This paper presents an experimental investigation to identify suitable indices to assess durability of glulam when subjected to freeze-thaw cycles in an exposed enviroenment.In this study,two types of glulam specimens were tested for their performance when subjected to different levels of aging due to freezing and thawing.Effect of aging treatment on various parameters including thickness swelling rate,static bending strength,elastic modulus,shear strength,and peeling rate of adhesive layer were studied.Obtained results showed that freeze-thaw aging treatment did not affect the water-resistance of the specimens as measured by thickness swelling rate and had little effect on the dimensional stability of the material.However,the applied aging treatment weakened the bending resistance of the glulam specimens with more pronounced effects on on low-density wood.On the other hand,bond strength of high-density wood was relatively more affected due to the appliedfreeze-thaw cycles.For highdensity wood,it is suggested that the shear strength of the adhesive layer be taken as an important index to determine the durability of freeze-thaw cycles aging.For low-density wood,on the other hand,the static bending strength can be used as an index to determine the durability of glulam under freeze-thaw cycles aging.

关 键 词：Freeze-thaw cycles structural glulam DURABILITY wood failure percentage accelerated aging 

分 类 号：TS6[轻工技术与工程]