CAREER: Consecutive Assembly-and-Mineralization Processed Calcium-Silicate-Hydrate Nacre with High Specific Flexural Strength and Fracture Toughness

事业：连续组装和矿化加工的具有高比弯曲强度和断裂韧性的硅酸钙水合物珍珠质

• 批准号: 2046407
• 负责人: Weina Meng
• 金额: $ 50万
• 依托单位: Stevens Institute of Technology
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2021
• 资助国家: 美国
• 起止时间: 2021-02-01 至 2026-01-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2046407&HistoricalAwards=false
• 关键词: CAREER; Consecutive; Assembly; Mineralization; Processed

This Faculty Early Career Development (CAREER) program will address the challenge to transform calcium-silicate-hydrate (CSH) - the ingredient of cement that is primarily responsible for its strength - and achieve unprecedented mechanical properties. CSH has high strength under compression, but is significantly weaker under bending and has low fracture toughness. The irregular and random nature of the nanostructure of CSH is responsible for its brittle nature. This research will innovate new CSH nanostructures that are inspired by the unique architecture of nacre, which is ultra-lightweight and recognized as one of the strongest biomaterials. The growth of natural nacre will be mimicked to synthesize CSH with polymers and organics to form highly ordered nacre-like architectures. This research will create novel cement-based materials with crack resistance as high as that of natural nacre, which will tremendously enhance the resilience, sustainability, and durability of civil engineering structures (such as prefabricated walls and panels of buildings, linings of tunnels or pipelines, and permanent formwork of bridges), energy infrastructure (such as solar panels, offshore wind farms), aerospace structures and others. The education and outreach activities of this project will engage and create opportunities for K-12 students and underrepresented minorities in STEM disciplines to learn about biomimetic materials and structures in engineering. The goal of this research is to demonstrate the hypothesis that CSH nacre architecture can be synthesized to achieve high specific flexural strength and fracture toughness through a consecutive assembly-and-mineralization process mimicking the growth of natural nacre. The main objectives of this research are to: (i) develop methods to synthesize and control growth of CSH mesocrystals; (ii) develop a consecutive assembly-mineralization process for scalable fabrication of CSH nacre; (iii) characterize mechanical properties of the synthetic CSH nacre; and (iv) establish links for the fabrication process, microstructure, and mechanical properties to optimize the CSH nacre. To this end, a scaffold will first be fabricated by freeze casting and followed by nucleation and growth of CSH mesocrystals on the scaffold through controlled mineralization; then, laminated CSH nacre will be synthesized through organic phase infiltration and hot-pressing. The CSH nacre will be tested and optimized by experiments, modeling, and machine learning.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.

该教师早期职业发展（CAREER）计划将解决转变硅酸钙水合物（CSH）的挑战-水泥的主要成分是负责其强度-并实现前所未有的机械性能。CSH在压缩下具有高强度，但在弯曲下明显较弱，并且具有低断裂韧性。CSH的纳米结构的不规则和随机性质是其脆性性质的原因。这项研究将创新新的CSH纳米结构，其灵感来自珍珠层的独特结构，珍珠层是超轻质的，被认为是最强的生物材料之一。模拟天然珍珠层的生长，用聚合物和有机物合成CSH，形成高度有序的珍珠层结构。这项研究将创造出新型水泥基材料，其抗裂性与天然珍珠母一样高，这将极大地提高土木工程结构（如建筑物的预制墙和面板，隧道或管道的衬里，以及桥梁的永久模板），能源基础设施（如太阳能电池板，海上风电场），航空航天结构等的弹性，可持续性和耐久性。该项目的教育和外联活动将吸引K-12学生和STEM学科代表性不足的少数群体参与并创造机会，以了解工程中的仿生材料和结构。本研究的目的是证明CSH珍珠层结构可以通过模拟天然珍珠层生长的连续组装和矿化过程合成以实现高比弯曲强度和断裂韧性的假设。本研究的主要目标是：（i）开发方法来合成和控制生长的CSH介晶;（ii）开发一个连续的组装矿化过程的CSH珍珠层的可扩展的制造;（iii）表征合成的CSH珍珠层的机械性能;和（iv）建立链接的制造工艺，微观结构和机械性能，以优化CSH珍珠层。为此，首先通过冷冻铸造制造支架，然后通过控制矿化使CSH介晶在支架上成核和生长;然后通过有机相渗透和热压合成层压CSH珍珠层。CSH珍珠层将通过实验、建模和机器学习进行测试和优化。该奖项反映了NSF的法定使命，并通过使用基金会的知识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

Automatic identification and quantification of dense microcracks in high-performance fiber-reinforced cementitious composites through deep learning-based computer vision

• DOI: 10.1016/j.cemconres.2021.106532
• 发表时间: 2021-07-13
• 期刊: CEMENT AND CONCRETE RESEARCH
• 影响因子: 11.4
• 作者: Guo, Pengwei;Meng, Weina;Bao, Yi
• 通讯作者: Bao, Yi

New development of ultra-high-performance concrete (UHPC)

• DOI: 10.1016/j.compositesb.2021.109220
• 发表时间: 2021-09-20
• 期刊: COMPOSITES PART B-ENGINEERING
• 影响因子: 13.1
• 作者: Du, Jiang;Meng, Weina;Wang, Hao
• 通讯作者: Wang, Hao

AI-assisted Design, 3d Printing, and Evaluation of Architecture Polymer-concrete Composites (APCC) With High Specific Flexural Strength and High Specific Toughness

• DOI: 10.2139/ssrn.4515439
• 发表时间: 2023
• 期刊: SSRN Electronic Journal
• 作者: Rojyar Barhemat;Soroush Mahjoubi;Weina Meng;Yi Bao

Morphological, microstructural, and mechanical properties of highly-ordered C–S–H regulated by cellulose nanocrystals (CNCs)

• DOI: 10.1016/j.cemconcomp.2023.105276
• 发表时间: 2023-10
• 期刊: Cement and Concrete Composites
• 影响因子: 10.5
• 作者: Yuhuan Wang;Sarah Goodman;Yi Bao;Weina Meng

Real-time video recognition for assessing plastic viscosity of ultra-high-performance concrete (UHPC)

• DOI: 10.1016/j.measurement.2022.110809
• 发表时间: 2022-03
• 期刊: Measurement
• 影响因子: 5.6
• 作者: Pengwei Guo;Jiang Du;Yi Bao;Weina Meng