PFI-TT: Bio-inspired enhancement of concrete for carbon sequestration and longevity

PFI-TT：仿生增强混凝土以实现碳封存和长寿

• 批准号: 2329856
• 负责人: Warda Ashraf
• 金额: $ 55万
• 依托单位: University of Texas at Arlington
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2024
• 资助国家: 美国
• 起止时间: 2024-01-01 至 2025-12-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2329856&HistoricalAwards=false
• 关键词: PFI; TT; Bio; inspired; enhancement

The broader impact of this Partnerships for Innovation - Technology Translation (PFI-TT) project is to develop novel bio-inspired additives that will enhance carbon sequestration, mechanical performance, and the longevity of concrete. Ordinary Portland Cement (OPC) is one of the most energy-intensive manufacturing industries in the U.S. and is responsible for nearly 8% of global anthropogenic carbon emissions. Due to the high carbon footprint of OPC, a variety of alternative low-carbon cementitious materials have been developed in the past decade, many of which rely on carbon dioxide (CO2) curing. However, the potential chemical admixtures, that can enable controlling the performances of this new generation of CO2-cured concrete have not been well-explored yet, primarily due to the lack of understanding of the hardening mechanism of these materials. This project focuses on designing and resolving the upscaling challenges of bio-inspired additives specifically formulated for CO2-cured concrete. The bio-inspired additives will improve the functionality of CO2-cured concrete and therefore, expand the application sector for such low-carbon technologies. The application of such low-carbon technologies will enable the U.S. government’s goal of reaching Net Zero emissions by 2050.The proposed project aims to upscale and evaluate the commercialization potential of bio-inspired additives via following four tasks: (i) evaluate the compatibility of bio-inspired additives with traditional chemical admixtures that are typically used to control different performances of concrete, (ii) investigate the effectiveness of bio-inspired additives at different length scales and environmental conditions with variable CO2 concentration levels, (iii) investigate the durability performances of concrete prepared using bio-inspired additives, and (iv) perform environmental impact assessment and techno-economic assessment of producing and using bio-inspired additives in the production of carbonation cured cementitious composites. Calcium carbonate (CaCO3) mineral is the primary binding phase that controls the strength as well as the CO2 sequestration capacity of carbonation-cured cementitious composites. A series of bio-inspired additives were found to be able to control the CaCO3 precipitation and polymorph conversion kinetics in carbonation-cured cementitious composites. By doing so, these additives can enhance the mechanical performance, CO2 sequestration capacity, and durability of carbonation-cured cementitious composites. To mitigate the potential risks of upscaling and commercialization of these bio-inspired additives, their performance and cost-effectiveness for different cementitious material systems, length scales, and environmental conditions will be evaluated in this project.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.

该创新合作伙伴关系 - 技术转化 (PFI-TT) 项目的更广泛影响是开发新型仿生添加剂，以提高碳封存、机械性能和混凝土的使用寿命，普通波特兰水泥 (OPC) 就是其中之一。美国能源密集型制造业，占全球人为碳排放量的近8%，由于OPC的碳足迹较高，过去十年已开发出多种替代低碳胶凝材料，其中许多依赖于二氧化碳（CO2）固化，然而，能够控制新一代二氧化碳固化混凝土性能的潜在化学外加剂尚未得到充分探索，这主要是由于缺乏对这些化学外加剂的了解。该项目的重点是设计和解决专门为二氧化碳养护混凝土配制的仿生添加剂的升级挑战。仿生添加剂将改善二氧化碳养护混凝土的功能，从而扩大其应用范围。此类低碳技术的应用将使美国政府实现到 2050 年实现净零排放的目标。拟议项目旨在通过以下四个方面来升级和评估仿生添加剂的商业化潜力。任务：（i）评估仿生添加剂与通常用于控制混凝土不同性能的传统化学外加剂的相容性，（ii）研究仿生添加剂在不同长度尺度和环境条件下的有效性二氧化碳水平，(iii) 研究使用仿生添加剂制备的混凝土的耐久性能，以及浓度 (iv) 对在碳化固化水泥复合材料的生产中生产和使用仿生添加剂进行环境影响评估和技术经济评估。碳酸钙 (CaCO3) 矿物是控制碳化固化水泥基复合材料的强度和 CO2 封存能力的主要粘结相，一系列仿生添加剂被发现能够控制碳化固化水泥基复合材料的强度和 CO2 封存能力。碳化固化水泥基复合材料中的 CaCO3 沉淀和多晶型物转化动力学通过这样做，这些添加剂可以提高碳化固化水泥基复合材料的机械性能、二氧化碳封存能力和耐久性，以减轻这些生物的升级和商业化的潜在风险。 -本项目将评估受启发的添加剂，其针对不同水泥材料系统、长度尺度和环境条件的性能和成本效益。该奖项是 NSF 的法定使命，并已被通过使用基金会的智力优点和更广泛的影响审查标准进行评估，认为值得支持。