Durable Nano-Engineered Cementitious Systems

耐用的纳米工程水泥系统

• 批准号: RGPIN-2017-06870
• 负责人: Bindiganavile, Vivek
• 金额: $ 1.75万
• 依托单位: University of Alberta
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2020
• 资助国家: 加拿大
• 起止时间: 2020-01-01 至 2021-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=712475
• 关键词: Durable; Nano; Engineered; Cementitious; Systems

Durability issues plague cementitious systems: The distress could arise either from physical causes -shrinkage and thermal cracking- or from the chemical environment . Both traditional building materials and modern systems are equally susceptible and ensuring their longevity seriously engages concrete technologists. Performance is related intimately to the microstructure: air-void network, stability of hydration products and the bond at various interfaces in the system. For the most part, research has focused largely at macro-engineering of properties, ie. treating the symptom but not the cause! However, the building block is at the nanometric scale, which warrants a concerted focus on tailoring the physical and chemical properties of such systems to suit each application. Nanotechnology enables us to understand, control, and restructure matter within cementitious systems in the order of nanometers. Because of their size, nanomaterials have the ability to impart novel and/or significantly improved physical, chemical, biological and electronic properties. This applicant has conducted pilot studies on cellulose based (and hence, sustainable) nanofibres to illustrate their efficiency with internal curing and address shrinkage, especially in flatwork. Further, preliminary investigation on nanosilica and nanolime in hydraulic lime mortars resulted in improved bond behavior and also superior water tightness. The focus of the program proposed here is to employ these and similar nanomaterials as templates upon which suitable chemical groups shall be grafted to achieve tunable nano-agents. Thus, nano-engineering is expected to render a new generation of tailored, multifunctional composites with a range of useful properties such as low electrical resistivity, self-sensing ability, high ductility, self-healing and control of cracks in a variety of adverse physical and chemical environments. In the short term, this proposal will: (i) improve durability of cement based systems; (ii) improve place-ability and hydration characteristics in non-Portland cement systems and (iii) develop innovative binders through value added industrial and agro waste materials. The long term goal is to characterize and develop durable building materials for sustainable construction. Four graduate research assistants (2 PhD and 2 MSc) along with multiple undergraduate research interns will be directly active with the applicant on the proposed research during the tenure of this grant. In addition, they will interact with research personnel in allied areas, as part of this program. Through the involvement of a diverse set of student researchers, a new generation of high quality personnel will be introduced to the use of advanced biomaterials, nanomaterials, identification techniques for chemical quantification, computational simulations and high performance structural materials.

耐久性问题瘟疫胶结系统：遇险可能是由于物理原因 - shrinkage和Thermal裂纹或化学环境引起的。传统的建筑材料和现代系统都同样容易受到影响，并确保其寿命认真吸引了具体的技术人员。性能与微观结构密切相关：空气网络，水合产品的稳定性和系统中各个接口处的键。在大多数情况下，研究主要集中在物业的宏观工程上，即。治疗症状，但不是原因！但是，构建块是纳米尺度的，该尺度值得一致的重点定制此类系统的物理和化学特性以适合每种应用。 纳米技术使我们能够按纳米顺序理解，控制和重组物质。由于其大小，纳米材料具有赋予新颖和/或显着改善物理，化学，生物学和电子特性的能力。该申请人已经对基于纤维素的纳米纤维进行了试点研究，以说明其内部固化的效率，并解决了收缩，尤其是在平面工作中。此外，对液压石灰砂浆中纳米硅硅硅硅和纳米液的初步研究导致粘结行为改善，也提高了较高的水紧密度。此处提出的该计划的重点是使用这些和类似的纳米材料作为模板，应将合适的化学基团移植以实现可调的纳米剂。因此，预计纳米工程将使新一代量身定制的多功能复合材料具有一系列有用的特性，例如低电阻率，自感应能力，高延展性，自我修复，自我修复和控制各种不良物理和化学环境中的裂纹。 在短期内，该建议将：（i）提高基于水泥的系统的耐用性； （ii）改善非业水泥系统中的放置能力和水合特性，以及（iii）通过增值工业和农业废料开发创新的粘合剂。长期目标是表征和开发可持续建筑的耐用建筑材料。 四名研究生研究助理（2位博士学位和2个MSC）以及多个本科研究实习生将直接与申请人一起在这笔赠款期间的拟议研究中活跃。此外，作为该计划的一部分，他们将与盟军的研究人员进行互动。通过参与各种学生研究人员的参与，将引入新一代高质量的人员，用于使用先进的生物材料，纳米材料，用于化学定量的识别技术，计算模拟和高性能结构材料。