文献类型：期刊文献

英文题名：Study of Properties and Mechanism of Bonding Line in Three-Layer Hybrid Cross-Laminated Timber

作者：Li, Mingyue[1] Ren, Haiqing[1] Wang, Yurong[1]

第一作者：Li, Mingyue

通信作者：Wang, YR[1]|[a0005066e07bcca30717f]王玉荣;

机构：[1]Chinese Acad Forestry, Res Inst Wood Ind, Beijing 100091, Peoples R China

年份：2022

卷号：34

期号：12

外文期刊名：JOURNAL OF MATERIALS IN CIVIL ENGINEERING

收录：;EI(收录号：20224513056307);Scopus(收录号：2-s2.0-85141039030);WOS:【SCI-EXPANDED(收录号:WOS:000867889700019)】；

基金：This research was funded by the National Natural Science Foundation (Project No. 31971596).

语种：英文

外文关键词：Cross-laminated timber (CLT); Bonding performance; Failure mode; Buffering capacity; Density; Surface energy; pH

摘要：The physical and chemical properties of three kinds of laminations relative to the bonding properties of three-layer hybrid cross-laminated timber (CLT) were studied. The density of the parallel layer lamination of CLT was 640.47 +/- 61.85 kg/m(3), and the perpendicular layer laminations for CLT larch wood, poplar, and oriented strand board (OSB) were 392.51 +/- 40.14, 343.73 +/- 17.16, and 384.41 +/- 12.93 kg/m(3). Block shear bond strength (BBS), wood failure percentage (WFP), and delamination rate (DR) of the hybrid CLT specimens were also determined. The results showed that the three kinds of hybrid CLT prepared with polyurethane (PUR) adhesive had good bonding properties under 1.2 MPa of bonding pressure. The BBS values of CLT with larch wood, poplar hybrid, and OSB hybrid were 2.32, 2.41, and 1.98 MPa, respectively; furthermore, their WFPs were all greater than 80%, and their DRs were 9.32%, 0.37%, and 0.11%, respectively. Regarding the relationship between perpendicular layer material properties and bonding properties, analysis revealed that delamination performance was strongly correlated with pH, buffer capacity, and the surface free energy of the perpendicular layer, whereas the WFP and BBS values had a strong correlation with pH and buffer capacity. Density was determined to be unrelated to bonding performance in the CLT prepared in this experiment. Microscopic analysis of the bonding line proves that the PUR adhesive can effectively penetrate into three different laminations under a bonding pressure of 1.2 MPa and form enough nails to ensure bonding strength. (C) 2022 American Society of Civil Engineers.