SAFE, SUSTAINABLE AND DIGITALLY-MONITORED CONCRETE STRUCTURES FOR SMART CITIES

* ** 智慧城市是整合基础设施 * 和服务的城市，通过智能传感器和先进的 * 数据科学，产生一个有效的城市生态系统，整合机构，* 物理，社会和经济基础设施。智慧城市中的混凝土基础设施不仅必须安全和可持续，还必须集成物联网（IoT）和信息通信技术（ICT），以实现运营效率，成本效益高的维护和寿命终止的可拆卸性。该提案的主要目标是为智能城市发展安全，可持续和数字监控的混凝土结构做出贡献。 这些目标不仅适用于新建筑，也适用于需要恢复其失去的能力的损坏结构，以及没有损坏但仍然需要加强以抵御地震和火灾等灾害的结构。** 这项提案的重点是开发高度耐损伤的材料，这些材料利用纳米技术的原理来描述自我修复，智能和低碳行为，并可以使用数字授权的过程（如3D打印）放置在结构中。在这样做的过程中，该计划努力整合材料科学，传感器和结构工程的前沿发现。 ** 该提案集中在两个广泛的领域：第一：* 它旨在开发一种新型的纤维增强混凝土，称为生态友好型 * 韧性水泥基复合材料（EDCC），具有自我修复，耐用，低碳 * 和耐损伤高达6%的应变。还建议用纳米颗粒对EDCC中的基质 * 进行改性，并用来自用亲水性和火山灰纳米涂层改性的废物流（如轮胎）的共挤出回收纤维 * 对其进行增强。在一个应用中，中空纤维 * 被提议作为EDCC的增强材料;纤维可以携带控制释放的生物杀灭剂 *，能够对抗下水道管道中混凝土的生物腐蚀。提出了准静态、冲击和爆炸载荷试验。最后，建议 * 开发3D打印协议来放置EDCC。第二：建议 * 开发基于携带导电碳纤维和 * 碳纳米管的智能EDCC的传感器。这些压阻传感器将进一步发展，用于化学、生物、冲刷和爆炸监测。 最后，提出了四个技术示范项目，包括使用可控生物杀灭剂EDCC修复下水道管道，使用喷洒EDCC加固学校的地震，使用EDCC打印低成本房屋的3D打印以及使用高冲击/防爆EDCC建造的防御掩体。这些将使用上述新型传感器进行监测。** 在未来五年内，拟议的研究计划预计将提供25个研究生年的HQP培训。

* **Smart cities are cities that integrate infrastructure*and services to produce an efficient urban eco-system that integrates institutional,*physical, social and economic infrastructure through smart sensors and advanced*data-science. Concrete infrastructure in a Smart City must not only be safe and*sustainable, but must also integrate Internet of Things (IoT) and Information*and Communication Technology (ICT) to achieve operational efficiency,*cost-effective maintenance and end-of-life deconstructability. The primary*objective of this proposal is to contribute towards development of safe, sustainable,*and digitally-monitored concrete structures for Smart Cities. These objectives apply not only to new*construction, but also to deteriorated structure that need to regain their lost*capacity, as well as structures that are not deteriorated but still requires*strengthening against calamities such as earthquakes and fires. *** ***This proposal focuses on development of highly*damage-tolerant materials that utilize principles of nanotechnology to depict self-healing,*smartness and low-carbon behavior and can be placed in structures using digitally*empowered processes such as 3-D printing. In doing so, the program strives to integrate cutting edge*discoveries in materials sciences, sensors and structural engineering. *** ***The proposal focuses on two broad areas: FIRST:*It purports to develop a novel class of fiber reinforced concretes called Eco-Friendly*Ductile Cementitious Composites (EDCC) that are self-healing, durable, low-carbon,*and damage tolerant up to 6% strain. It is further proposed to modify matrices*in EDCC with nano-particles and reinforce them with co-extruded recycled fibers*from waste streams (such as tires) modified with hydrophilic and pozzolanic nano-coatings.* In one application, hollow fibers are*proposed as reinforcement in EDCC; fibers that can carry controlled release biocides*capable of fighting biogenic corrosion of concrete in sewer pipes. Both*quasi-static and impact and blast loading tests are proposed. Finally, it is proposed*to develop 3-D printing protocols to place EDCC. SECOND: It is proposed to*develop sensors based on smart EDCC carrying conductive carbon fibers and*carbon nano-tubes. These piezo-resistive sensors will be further developed for chemical,*biological, scour and blast monitoring. Finally*FOUR technology demonstration projects are proposed including rehabilitation of a sewer pipe with controlled biocide*release EDCC, seismic strengthening of a school using sprayed EDCC, 3-D*printing of a low cost house with EDCC and a defense shelter built using highly*impact/blast resistant EDCC. These will be monitored using novel sensors described above. *** ***Over*the next five years, the proposed program of research is expected to provide a*total HQP training of 25 graduate student-years.**