Research on mechanical properties and fire resistance of flame-retardant laminated veneer lumber fabricated with fast-growing poplar

IF 2.4 3区 农林科学 Q1 FORESTRY
Zhekui Cui, Qing Chun, Zheng Wang, Boxu Lin, Jian Sun
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Abstract

To fully utilize Chinese fast-growing timber resources, fast-growing poplar was selected for manufacturing flame-retardant laminated veneer lumber (FRLVL). Firstly, orthogonal experiments were conducted to assess the impact of four factors (hot-pressing time, hot-pressing temperature, retardant concentration, and retardant types) on the mechanical properties and burning behavior of FRLVL. Subsequently, optimal manufacturing parameters were chosen based on statistical analysis. Finally, the fire performance of LVL manufactured with the optimal parameters was evaluated to investigate changes in physical–mechanical properties under high-temperature conditions. Results indicated that the addition of retardants led to a decrease in mechanical properties. In comparison to the control group, LVL impregnated with two retardants exhibited higher limited oxygen index and longer fireproof time, with the effects of ammonium polyphosphate (APP) surpassing those of borax (BX). The optimal manufacturing parameters were a hot-pressing temperature of 140 °C, a hot-pressing time of 1.3 min/mm, and concentrations of 15%. As the temperature increased, the mechanical properties of LVL manufactured with the optimal parameters decreased noticeably. However, under the conditions of a temperature of 200 °C and a treatment time of 90 min, the mechanical properties of LVL still met the LVL-32P grade proposed in LVL handbook.

速生杨木复合阻燃单板的力学性能及耐火性能研究
为充分利用中国速生木材资源,选用速生杨木生产阻燃复合单板木材。首先,通过正交试验考察了热压时间、热压温度、阻燃剂浓度和阻燃剂类型4个因素对FRLVL力学性能和燃烧性能的影响。然后,基于统计分析选择最优制造参数。最后,对优化后的LVL材料在高温条件下的防火性能进行了评价,研究了其物理力学性能的变化。结果表明,缓凝剂的加入使材料的力学性能下降。与对照组相比,两种阻燃剂浸渍LVL的极限氧指数更高,防火时间更长,且聚磷酸铵(APP)的效果优于硼砂(BX)。最佳工艺参数为热压温度140℃,热压时间1.3 min/mm,热压浓度15%。随着温度的升高,采用最佳参数制备的LVL的力学性能明显下降。然而,在温度为200℃、处理时间为90 min的条件下,LVL的力学性能仍然满足LVL手册中提出的LVL- 32p等级。
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来源期刊
European Journal of Wood and Wood Products
European Journal of Wood and Wood Products 工程技术-材料科学:纸与木材
CiteScore
5.40
自引率
3.80%
发文量
124
审稿时长
6.0 months
期刊介绍: European Journal of Wood and Wood Products reports on original research and new developments in the field of wood and wood products and their biological, chemical, physical as well as mechanical and technological properties, processes and uses. Subjects range from roundwood to wood based products, composite materials and structural applications, with related jointing techniques. Moreover, it deals with wood as a chemical raw material, source of energy as well as with inter-disciplinary aspects of environmental assessment and international markets. European Journal of Wood and Wood Products aims at promoting international scientific communication and transfer of new technologies from research into practice.
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