The Influence of the Binder Type & Aggregate Nature on the Electrical Resistivity of Conventional Concrete

粘合剂类型的影响

• 批准号: 532169-2018
• 负责人: MorettiSanchez, LeandroFrancisco
• 金额: $ 1.82万
• 依托单位: University of Ottawa
• 依托单位国家: 加拿大
• 项目类别: Engage Grants Program
• 财政年份: 2018
• 资助国家: 加拿大
• 起止时间: 2018-01-01 至 2019-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=660189
• 关键词: Influence; Binder; Type; Aggregate; Nature

Concrete has been increasingly used in a number of civil engineering applications due to its interesting fresh,**hardened and durability-related properties. Compressive strength, normally measured at 28 days, is the most**important hardened state property of concrete and is often used as an indicator of its "microstructure quality".**On the other hand, pressure is mounting in the construction industry to optimize construction scheduling and**reduce delays which makes imperative to have a fast, thorough and reliable control of the "early-age" properties**of the material. Numerous advanced techniques have been proposed in this regard, and it has been found that**electrical resistivity (ER), a non-destructive and inexpensive technique, is able to characterize microstructure**development and thus evaluate mechanical and durability-related properties of cementitious materials, such as**concrete, over time. Conversely, recent literature data have evidenced that ER may be significantly influenced**by a variety of parameters such as the test setup (i.e. surface resistivity vs bulk resistivity vs internal resistivity),**material porosity and moisture content, binder type/amount and presence of supplementary cementing materials**(SCMs) along with the nature of the aggregates used in the mix (i.e. magmatic vs. metamorphic vs.**sedimentary rocks), which complicates the practical benchmark of concrete mixtures proportioned with distinct**raw materials. In this context, Giatec Scientific Inc. is a world-leading Ottawa-based company that uses**cutting-edge technologies of wireless sensors and mobile apps to collect a variety of data related to concrete.**One of the most promising markets for Giatec is the measurement of ER in conventional concrete and its**correlation with the mechanical properties of material over time (e.g. compressive strength). Giatec is currently**seeking the expertise of a concrete materials expert such as the applicant through a first-time collaboration to**study the impact of the binder type/amount and aggregate's nature on the ER response of conventional concrete**mixtures presenting a wide range of raw materials. The research results will help Giatec to enhance its current**ER device, increase the accuracy of the test outcomes and improve the overall quality of the services offered to

由于其有趣的新鲜、**硬化和耐久性相关特性，混凝土已越来越多地用于许多土木工程应用。抗压强度通常在 28 天时测量，是混凝土最**重要的硬化状态性能，通常用作其“微观结构质量”的指标。**另一方面，建筑行业优化性能的压力越来越大施工进度安排并**减少延误，因此必须快速、彻底且可靠地控制材料的“早期”特性**。在这方面已经提出了许多先进的技术，并且已经发现**电阻率（ER）是一种非破坏性且廉价的技术，能够表征微观结构**的发展，从而评估机械和耐久性相关的性能。随着时间的推移，水泥材料，例如**混凝土。相反，最近的文献数据证明，ER 可能会受到各种参数的显着影响**，例如测试设置（即表面电阻率、体电阻率与内电阻率）、**材料孔隙率和水分含量、粘合剂类型/数量和辅助胶结材料**（SCM）的存在以及混合物中使用的骨料的性质（即岩浆岩与变质岩与**沉积岩），这使实际基准变得复杂与不同**原材料配比的混凝土混合物。在这种背景下，Giatec Scientific Inc. 是一家世界领先的渥太华公司，它使用**无线传感器和移动应用程序的尖端技术来收集与混凝土相关的各种数据。**最有前途的市场之一Giatec 是对传统混凝土中 ER 的测量，及其与材料随时间的机械性能（例如抗压强度）的相关性。 Giatec 目前**通过首次合作寻求混凝土材料专家（例如申请人）的专业知识，以**研究粘合剂类型/用量和骨料性质对传统混凝土**混合物的 ER 响应的影响原材料范围广泛。研究结果将帮助 Giatec 增强其当前的 **ER 设备，提高测试结果的准确性并提高所提供服务的整体质量