Collaborative Research: Nano-Engineered Superwood for Resilient Foundation Systems

合作研究：用于弹性基础系统的纳米工程超级木材

• 批准号: 2120640
• 负责人: Qinglin Wu
• 金额: $ 11.82万
• 依托单位: Louisiana State University Agricultural Center
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2022
• 资助国家: 美国
• 起止时间: 2022-01-01 至 2024-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2120640&HistoricalAwards=false
• 关键词: Collaborative; Research; Nano; Engineered; Superwood

Timber piles are a renewable and low-cost foundation system. With the development of steel and concrete piles, the use of timber piles has steadily declined as timber piles have low stiffness and strength, limiting their applications to lightly loaded structures. This project aims to develop a high stiffness and strength, durable, and cost-effective superwood pile foundation system for heavily loaded and resilient civil infrastructure. Recent research on wood-based nanomaterials has led to a high-performance structural material known as superwood, which is desirable for advanced applications in the fields of civil, automotive, aerospace, and manufacturing engineering. This research will use experimental and modeling techniques and life-cycle analysis to engineer and verify the superwood pile foundation system through collaboration between geotechnical and wood composite engineering researchers. The research team will engage underrepresented minority middle and high school students in research of foundation and wood composite engineering via existing Louisiana State University (LSU) outreach programs. The project will also contribute to the training and education of undergraduate and graduate students at LSU.Superwood is a densified wood material produced by partially delignifying natural wood and subsequent densification through hot-pressing. Superwood production is potentially sustainable and cost-effective as it avoids energy-intensive manufacturing processes associated with Portland cement and steel. The strength and elastic modulus of superwood are not only superior to those of natural wood, but could also exceed those of concrete. Superwood also has excellent durability against moisture-induced decay and insects such as termites with minimal strength reduction. The remarkable properties of superwood are expected to enable superwood piles to (1) mitigate the disadvantages of current timber piles (e.g., low structural capacity, vulnerability to damage during hard-driving, and susceptibility to decay) and (2) to exceed the performance of timber and concrete piles for both service and strength limit states. The objectives of this research are to (1) optimize processing conditions for producing superwood piles in relation to their mechanical properties and durability performance including decay and termite resistances, (2) investigate the soil-pile interaction behavior of superwood piles through laboratory experiments, (3) develop numerical models to predict the responses of superwood piles under different soil and loading conditions, and (4) assess the cost and environmental impacts of superwood piles by performing life-cycle analysis. This research will promote further development of superwood in geotechnical engineering, including ground improvements, retaining walls, and support of excavation structures.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

木桩是一种可再生且低成本的基础系统。随着钢桩和混凝土桩的发展，木桩的使用逐渐减少，因为木桩的刚度和强度较低，限制了其在轻载结构中的应用。该项目旨在为重载和有弹性的民用基础设施开发一种高刚度和强度、耐用且具有成本效益的超级木桩基础系统。最近对木基纳米材料的研究产生了一种被称为超级木材的高性能结构材料，它非常适合土木、汽车、航空航天和制造工程领域的高级应用。这项研究将通过岩土工程和木质复合材料工程研究人员之间的合作，使用实验和建模技术以及生命周期分析来设计和验证超级木桩基础系统。研究团队将通过路易斯安那州立大学 (LSU) 现有的推广计划，让代表性不足的少数族裔中学生参与基础和木质复合材料工程的研究。该项目还将为路易斯安那州立大学本科生和研究生的培训和教育做出贡献。Superwood 是一种致密木质材料，通过部分脱木素天然木材并随后通过热压致密化而生产。超级木材的生产具有潜在的可持续性和成本效益，因为它避免了与波特兰水泥和钢铁相关的能源密集型制造过程。超级木材的强度和弹性模量不仅优于天然木材，还可能超过混凝土。 Superwood 还具有出色的耐久性，可抵抗潮湿引起的腐烂和白蚁等昆虫，且强度降低最小。超级木的卓越性能预计将使超级木桩能够 (1) 减轻当前木桩的缺点（例如，结构能力低、在硬驱动过程中容易损坏、容易腐烂）和 (2) 超越性能木材和混凝土桩的使用和强度极限状态。本研究的目的是（1）优化生产超级木桩的加工条件，包括其机械性能和耐久性能，包括耐腐烂和白蚁性，（2）通过实验室实验研究超级木桩的土-桩相互作用行为，（ 3）开发数值模型来预测超级木桩在不同土壤和荷载条件下的响应，以及（4）通过进行生命周期分析来评估超级木桩的成本和环境影响。这项研究将促进超级木材在岩土工程中的进一步发展，包括地面改良、挡土墙和挖掘结构的支撑。该奖项反映了 NSF 的法定使命，并通过使用基金会的智力价值和更广泛的影响审查标准进行评估，被认为值得支持。

项目成果

Combined effects of deep eutectic solvent and microwave energy treatments on cellulose fiber extraction from hemp bast

低共熔溶剂和微波能量处理对大麻韧皮纤维素纤维提取的联合影响

• DOI: 10.1007/s10570-023-05081-3
• 发表时间: 2023-02-04
• 期刊: Cellulose
• 影响因子: 5.7
• 作者: B. Ahmed;Jaegyoung Gwon;Manish Thapaliya;A. Adhikari;Suxia Ren;Qinglin Wu
• 通讯作者: Qinglin Wu

Highly Flexible, Self-Bonding, Self-Healing, and Conductive Soft Pressure Sensors Based on Dicarboxylic Cellulose Nanofiber Hydrogels

基于二羧酸纤维素纳米纤维水凝胶的高度柔性、自粘合、自修复和导电软压力传感器

• DOI: 10.1021/acsapm.3c01024
• 发表时间: 2023-09-08
• 期刊: ACS Applied Polymer Materials
• 影响因子: 5
• 作者: Abouzeid, Ragab;Shayan, Mohammad;Wu, Tongyao;Gwon, Jaegyoung;Karki, Timo A.;Wu, Qinglin
• 通讯作者: Wu, Qinglin