组坯结构和单板等级对辐射松厚单板正交层压材弯曲和轴向抗压性能的影响

胡娟; 宁文正; 宁新广; 张亚慧; 于文吉; 黄宇翔

doi:10.12326/j.2096-9694.2026040

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组坯结构和单板等级对辐射松厚单板正交层压材弯曲和轴向抗压性能的影响
Effects of Layup Configuration and Veneer Grade on the Flexural and Axial Compressive Properties of Cross-Laminated-Thick Veneer Made from Radiata Pine
1.中国林业科学研究院木材工业研究所，北京 100091
2.蓬莱正泰木业有限公司，山东烟台 265600
2026年40卷第4期页码：59-67
DOI： 10.12326/j.2096-9694.2026040
稿件说明：

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胡娟,宁文正,宁新广等.组坯结构和单板等级对辐射松厚单板正交层压材弯曲和轴向抗压性能的影响[J].木材科学与技术,2026,40(04):59-67. DOI： 10.12326/j.2096-9694.2026040.

Hu Juan,Ning Wenzheng,Ning Xinguang,et al.Effects of Layup Configuration and Veneer Grade on the Flexural and Axial Compressive Properties of Cross-Laminated-Thick Veneer Made from Radiata Pine[J].Chinese Journal of Wood Science and Technology,2026,40(04):59-67. DOI： 10.12326/j.2096-9694.2026040.

摘要

为提高速生材在结构用工程木产品中的利用水平，以7.5 mm厚度辐射松（

Pinus radiata

）单板为原料，通过动态弹性模量将其分为A级单板（大于9 GPa）和B级单板（4～9 GPa）。采用3种组坯结构：I最外层和外层两层顺纹、内部顺横纹单层交替，II双层成组顺横纹交替，III单层连续正交，通过湿热应力去除、四侧槽榫机械互锁接长和冷压胶合等工艺，制备CLTV-A-I、CLTV-A-II、CLTV-A-III和CLTV-B-I共4组15层大规格厚单板正交层压材（cross-laminated-thick veneer，CLTV），试样尺寸为12 000 mm（长）×3

250 mm（宽）×105 mm（厚），比较单板等级、组坯结构对CLTV弯曲性能和轴向抗压强度的影响，并评价优化CLTV的基本物理性能、浸渍剥离性能和甲醛释放量。结果表明，组坯结构和单板等级均显著影响CLTV的弯曲性能（

＜0.05）。在相同组坯结构下，CLTV-A-I的抗弯强度（modulus of rupture，MOR）和弹性模量（modulus of elasticity，MOE）显著高于另外3组CLTV-A-II、CLTV-A-III和CLTV-B-I（

＜0.05），但CLTV-A-I与CLTV-B-I的轴向抗压强度差异不显著，分别为25.91 MPa和25.27 MPa。各组弯曲试件均从跨中下缘受拉侧起裂并呈脆性破坏，CLTV-A-I的裂纹扩展路径较集中、层间分离较轻，而CLTV-A-II、CLTV-A-III和CLTV-B-I的分层与撕裂更明显。CLTV-A-I和CLTV-B-I轴压试件均以渐进式局部压溃为主，伴有表层开裂和轻微层间损伤，未发生贯通性断裂。CLTV-A-I的气干密度为0.439 g/cm³，含水率为11%时，MOR和MOE分别为40.38 MPa和7.71 GPa；总剥离率和最大剥离率分别为1.5%和15.5%，满足GB/T 26899—2022《结构用集成材》规定的浸渍剥离性能要求；甲醛释放量为0.014 mg/m³，达到GB/T 39600—2021《人造板及其制品甲醛释放量分级》的E

级≤0.025mg/m³的限值要求。保持表层顺纹连续性、优化内部顺纹层与横纹层的交替方式，并采用高等级厚单板，可提高大规格CLTV的弯曲性能和受力整体性。

Abstract

To promote the use of fast-growing wood in structural engineered wood products

7.5 mm thick radiata pine (

Pinus radiata

) veneers were

according to their dynamic modulus of elasticity

classified according to their dynamic modulus of elasticity into two grades: grade A (

9 GPa) and grade B (4~9 GPa). Fifteen15-layer cross-laminated thick veneer (CLTV) panels were fabricated using three lay-up configurations: Structure I

with two longitudinal outer layers and alternating single longitudinal and transverse layers in the core; Structure II

with alternating two-layer groups oriented longitudinally and transversely; and Structure III

with continuously alternating single longitudinal and transverse layers. After hygrothermal stress relief

the veneers were longitudinally joined using four-sided tongue-and-groove mechanically interlocking joints and then cold-pressed bonded to produce full-scale CLTV panels measuring 12 000 mm (length) × 3 250 mm (width) × 105 mm (thickness). The effects of lay-up configuration on flexural properties and veneer grade on flexural properties and axial compressive strength were investigated. The basic physical properties

soak-delamination resistance

and formal

dehyde emission of the optimized CLTV panels were also evaluated. It was found that bBoth layup configuration and veneer grade significantly affected the flexural properties of CLTV (

0.05). CLTV-A-I

consisting of two longitudinal outer layers on each face and alternating single longitudinal and transverse layers in the core

exhibited superior flexural properties

with . Itsthe modulus of rupture (MOR) and modulus of elasticity (MOE) beingwere 40.38 MPa and 7.71 GPa

respectively

both of which were significantly higher than those of CLTV-A-II and CLTV-A-III (

0.05). With the same layup configuration

the MOR and MOE of group A-I were 74% and 40% higher

respectively

than those of CLTV-B-I

whereas their axial compressive strengths did not differ significantly

with values of 25.91 MPa and 25.27 MPa

respectively (

0.05). All flexural specimens exhibited brittle failure

with cracks initiating on the tensile side at the bottom of the midspan. CLTV-A-I showed a more localized crack propagation path and less interlayer separation

whereas more pronounced delamination and tearing were observed in CLTV-A-II

CLTV-A-III

and CLTV-B-I. Under axial compression

both CLTV-A-I and CLTV-B-I specimens exhibited predominantly progressive localized crushing

accompanied by surface cracking and minor interlayer damage

without through-thickness fracture. The an average air-dry density and moisture content of CLTV-A-I were 0.439 g/cm³ and 11%

respectively. Its a total and maximum delamination percentages were 1.5% and 15.5%

respectively

which were both meeting the soak-delamination performance requirements specified in GB/T 26899—2022 “

Structural Glued Laminated Timber

”

and its formaldehyde emission of was 0.014 mg/m³

which was below the E

-class limit specified in GB/T 39600—2021“

Classification of Formaldehyde Emission from Wood-based Panels and Their Products

”. Within the scope of this study

maintaining contin

uous longitudinal outer layers

optimizing the alternation of longitudinal and transverse core layers

and using higher-grade thick veneers could improved the flexural properties and structural integrity of large-scale CLTV.

关键词

Keywords

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