EAGER- Exploratory Study on Biomineralization in Cementitious Materials for Self-healing of Cracks

EAGER-胶凝材料生物矿化用于裂缝自修复的探索性研究

• 批准号: 1051406
• 负责人: Paramita Mondal
• 金额: $ 3万
• 依托单位: University of Illinois at Urbana-Champaign
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2010
• 资助国家: 美国
• 起止时间: 2010-08-15 至 2011-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1051406&HistoricalAwards=false
• 关键词: EAGER; Exploratory; Study; Biomineralization; Cementitious

This Early-Concept Grant for Exploratory Research (EAGER) project intends to carry out a preliminary evaluation of the potential of biomineralization in cementitious materials for self-healing of cracks. The main objectives are to examine the survival and effectiveness of the chosen microorganisms in concrete, and to evaluate the effects of carbonate deposition on crack remediation. Microorganisms induced carbonate deposition will be studied in simple test tube experiments and in mortar specimens. Scanning electron microscopy and X-ray diffraction will be used for detailed characterization of the deposits and to investigate if enough carbonate deposition can be achieved to fill up cracks. Fracture study will be performed to evaluate if carbonate deposits can promote regain of fracture toughness.Quasi-brittle nature of concrete and its tendency to crack makes maintenance of concrete structures a costly and labor intensive process. Thus research has been undertaken worldwide to develop a smart infrastructure material which can heal cracks. However, the perfect material that satisfies this need is yet to be developed. In recent years it has been reported by few researchers that bio-mineralization technique is promising based on its effect on compressive strength. However, increase in compressive strength is not a sufficient proof that the bond between newly developed carbonate and cracked material is sufficient to regain part of the strength lost due to cracking. This EAGER proposal carefully develops an experimental plan to evaluate potential of bio-mineralization. If this preliminary study shows promise it could pave the way for future work on biomineralization to establish a transformative concept of self-healing construction materials.

这项对探索性研究（急切）项目的早期概念赠款旨在对水泥材料中生物矿化的潜力进行初步评估。主要目标是检查混凝土中所选微生物的生存和有效性，并评估碳酸盐沉积对裂纹修复的影响。微生物诱导的碳酸盐沉积将在简单的试管实验和砂浆样品中研究。扫描电子显微镜和X射线衍射将用于详细的沉积物表征，并研究是否可以实现足够的碳酸盐沉积以填补裂缝。将进行断裂研究，以评估碳酸盐沉积物是否可以促进骨折韧性的恢复。混凝土的脆性性质及其破裂的趋势使维持混凝土结构的维护是昂贵且劳动力密集的过程。因此，在世界范围内进行了研究，以开发一种可以治愈裂缝的智能基础设施材料。但是，满足这一需求的理想材料尚未得到发展。近年来，很少有研究人员据报道，生物矿化技术基于其对抗压强度的影响而有希望。但是，提高抗压强度并不足够的证据表明，新开发的碳酸盐和破裂材料之间的键足以恢复因破裂而损失的强度的一部分。这项渴望的建议仔细制定了一项实验计划，以评估生物矿化的潜力。如果这项初步研究表明有望为将来的生物矿化工作铺平道路，以建立自我修复建筑材料的变革性概念。