Monitoring of Moisture and Dimensional Behaviors of Nail-Laminated Timber (NLT)-Concrete Slab Exposed to Outdoor Air

Q2 Engineering

Journal of the Korean wood science and technology Pub Date : 2022-09-01 DOI:10.5658/wood.2022.50.5.301

Sung-Wook Hwang, Hyunwoo Chung, Taekyeong Lee, Kyung-Sun Ahn, S. Pang, Jun-Sun Bang, H. Kwak, Jung-Kwon Oh, H. Yeo

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引用次数: 3

Abstract

The moisture and dimensional behaviors of a nail-laminated timber (NLT)–concrete slab composed of an NLT–plywood composite and topping concrete are monitored for 385 days. The slab is developed for using as flexural elements such as floors. The humidity control of wood gently introduces significant fluctuations under the ambient relative humidity into the slab, and fluctuations in the relative humidity result in dimensional changes. The equilibrium moisture content of the slab increases from 6.7% to 15.3% during the monitoring period, resulting in a width (radial) strain of 0.58%. The length (longitudinal) strain is negligible, and the height (tangential) strain is excluded from the analysis because of abstruse signal patterns generated. Concrete pouring causes a permanent increase in the width of the NLT–plywood composite. However, the width deforms because the weight of the concrete mixture loosens the nail-laminated structure, not because of the significant amount of moisture in the mixture. The dimensional stabilization effect of the nail-laminated system is demonstrated as the composite strain is lower than the total strain of lumber and plywood, which are elements constituting the nail-laminated structure.

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暴露在室外空气中的钉层合木材(NLT)-混凝土板的水分和尺寸特性监测

对由NLT胶合板复合材料和浇头混凝土组成的钉层木材混凝土板的水分和尺寸行为进行了385天的监测。该板是为使用弯曲元件如地板而开发的。木材的湿度控制轻轻地将环境相对湿度下的显著波动引入板材，相对湿度的波动导致尺寸变化。在监测期间，板坯的平衡含水率从6.7%增加到15.3%，导致宽度(径向)应变为0.58%。长度(纵向)应变可以忽略不计，高度(切向)应变由于产生的信号模式深奥而被排除在分析之外。混凝土浇筑导致nlt -胶合板复合材料的宽度永久增加。然而，宽度变形是因为混凝土混合物的重量使钉层压结构松动，而不是因为混合物中含有大量的水分。钉层合结构的复合应变小于构成钉层合结构的木材和胶合板的总应变，证明了钉层合结构的尺寸稳定效果。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of the Korean wood science and technology Materials Science-Materials Science (miscellaneous)

CiteScore

5.20

自引率

0.00%

发文量

期刊介绍： The Journal of the Korean Wood Science and Technology (JKWST) launched in 1973 as an official publication of the Korean Society of Wood Science and Technology has been served as a core of knowledges on wood science and technology. The Journal acts as a medium for the exchange of research in the area of science and technology related to wood, and publishes results on the biology, chemistry, physics and technology of wood and wood-based products. Research results about applied sciences of wood-based materials are also welcome. The Journal is published bimonthly, and printing six issues per year. Supplemental or special issues are published occasionally. The abbreviated and official title of the journal is ''J. Korean Wood Sci. Technol.''. All submitted manuscripts written in Korean or English are peer-reviewed by more than two reviewers. The title, abstract, acknowledgement, references, and captions of figures and tables should be provided in English for all submitted manuscripts.