粘合剂粘接的木材-混凝土复合楼板在标准火灾暴露下的热行为

IF 2 4区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY
Qiuni Fu, Haoze Chen, Sven Brunkhorst, Jochen Zehfuß, Bohumil Kasal, Libo Yan
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引用次数: 0

摘要

首次对粘合木材-混凝土复合板进行了防火测试。两块中等尺寸(1.8 × 1.25 米)的板是用环氧树脂和聚氨酯(PUR)粘合剂分别将 80 毫米厚的三层交叉层压木材(CLT)板粘合到 50 毫米厚的预制钢筋混凝土(RC)板上制成的。通过以下方法监测了复合板在高温下的行为:(1) 观察所用 CLT 的燃烧行为,例如炭化和分层;(2) 测量 CLT 板、混凝土与木板之间的粘合剂粘合处以及 RC 板不同位置的温度变化。研究发现,按照欧洲规范 5-1-2 的规定,采用纯软木的一维炭化模型,会因分层效应而低估 CLT 的炭化深度。测量结果表明,CLT 面板中间层的平均炭化率约为 0.65 毫米/分钟,这表明混凝土的存在不会对 CLT 面板的热行为产生重大影响。当 CLT 的粘合温度约为 230°C 时,可观察到其内部出现分层。随后,分层木层自由下落,进展缓慢,一直持续到试验结束。试验开始 90 分钟后,9 个位置的环氧树脂温度介于 55°C 和 130°之间,聚氨酯温度介于 60°C 和 100°之间。混凝土和 CLT 之间的粘合剂在超过玻璃化转变温度(本研究中环氧树脂为 58°C,聚氨酯为 23°C)后,会随着温度的升高而明显失去刚度。结果表明,混凝土板和木板之间的复合作用极有可能被削弱。钢筋的测量温度低于 50°C。然而,混凝土的温度达到了约 120°C,由于混凝土和木材之间明显的热膨胀以及粘合剂的刚性约束,混凝土出现了裂缝。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Thermal behavior of adhesively bonded timber-concrete composite slabs subjected to standard fire exposure

Thermal behavior of adhesively bonded timber-concrete composite slabs subjected to standard fire exposure

Fire tests were performed for the first time on adhesively bonded timber-concrete composite slabs. The two medium-scale (1.8 × 1.25 m) slabs were produced by gluing an 80-mm thick three-layer cross-laminated timber (CLT) board to a 50 mm thick prefabricated reinforced concrete (RC) slab with epoxy and polyurethane (PUR) adhesives, respectively. The behavior of the composite slabs under elevated temperature was monitored by (1) observing the burning behavior of the used CLT, for example, charring and delamination and (2) measuring the temperature development at different locations of the CLT slabs, in the adhesive bond between concrete and timber boards, and in RC slabs. It was found that employing a one-dimensional charring model for pure softwood, as prescribed by Eurocode 5-1-2, underestimated the charring depth of CLT due to the delamination effects. Measurements revealed that the average charring rates in the middle layer of CLT panels were approximately 0.65 mm/min, suggesting that the presence of concrete does not significantly affect the thermal behavior of the CLT panel. Delamination within the CLT was observed when its adhesive temperature was around 230°C. It was followed by the free-fall of delaminated wood plies, which progressed slowly and lasted until the end of the test. At 90 min into the test, the temperatures of epoxy at the nine locations ranged between 55°C and 130°, while that of PUR between 60°C and 100°. The adhesive between concrete and CLT could lose stiffness significantly along the rising of temperature after surpassing of glass transition temperature (58°C for epoxy and 23°C for PUR in this study). The results indicated a high risk of weakening the composite action between the concrete slab and timber board. The measured temperatures of steel rebar were lower than 50°C. However, the concrete temperature reached about 120°C and the concrete cracked due to the distinct thermal expansions between concrete and timber and the rigid constraint of adhesive bond.

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来源期刊
Fire and Materials
Fire and Materials 工程技术-材料科学:综合
CiteScore
4.60
自引率
5.30%
发文量
72
审稿时长
3 months
期刊介绍: Fire and Materials is an international journal for scientific and technological communications directed at the fire properties of materials and the products into which they are made. This covers all aspects of the polymer field and the end uses where polymers find application; the important developments in the fields of natural products - wood and cellulosics; non-polymeric materials - metals and ceramics; as well as the chemistry and industrial applications of fire retardant chemicals. Contributions will be particularly welcomed on heat release; properties of combustion products - smoke opacity, toxicity and corrosivity; modelling and testing.
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