In this study, we investigated the durability of adhesive bonds in the cross-laminated lumber of seven hardwood and two softwood species from the Great Lakes region. The 2-layered cross-laminations were glued using phenol resorcinol- and melamine-based structural adhesives. A total of 720 cross-laminated wood blocks were tested for delamination by exposing the samples to cyclic (wet-dry) conditions. Distribution of the adhesive on the bondlines was also studied to understand the effect of adhesive penetration on bond durability. The results indicated that mixed hardwood cross-laminations generally produced better bonds than single hardwood species cross-laminations. Hardwood and softwood hybrid cross-laminations were found to have better bond durability in dry-wet cycles. A high failure rate (≥ 50%) was found in the following single species cross-laminations: aspen, white ash, white pine, and yellow birch. Similarly, several mixed species cross-laminations resulted in a delamination rate of 50% and higher, which raises caution in their use in CLT manufacturing. In addition, the viscosity of the adhesive influences the maximum depth of penetration, which tends to affect the durability of adhesive bonds.

在这项研究中，我们调查了来自五大湖地区的七种硬木和两种软木树种的交叉层压木材中粘合剂粘合的耐久性。2 层交叉层压使用苯酚间苯二酚和三聚氰胺基结构粘合剂粘合。通过将样品暴露于循环（湿-干）条件下，总共对 720 个交叉层压木块进行了分层测试。还研究了粘合剂在粘合层上的分布，以了解粘合剂渗透对粘合耐久性的影响。结果表明，混合硬木交叉层压通常比单一硬木物种交叉层压产生更好的粘合。发现硬木和软木混合交叉层压在干湿循环中具有更好的粘合耐久性。在以下单一物种交叉层压中发现了高失败率 (≥ 50%)：白杨、白灰、白松和黄桦。同样，几种混合物种交叉层压导致 50% 或更高的分层率，这引起了在 CLT 制造中使用它们的谨慎。此外，粘合剂的粘度影响最大渗透深度，这往往会影响粘合剂粘合的耐久性。