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

混凝土由于其新鲜、硬化和耐久性相关的特性，已越来越多地用于许多土木工程应用。抗压强度通常在28天测量，是混凝土最重要的硬化状态属性，通常用作其“微观结构质量”的指标。另一方面，建筑行业的压力越来越大，以优化施工进度和减少延误，这使得必须对材料的“早期”属性进行快速，彻底和可靠的控制。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），一种非破坏性和廉价的技术，能够表征微观结构 ** 发展，从而评估水泥材料（如 ** 混凝土）随时间的机械和耐久性相关性能。相反，最近的文献数据已经证明ER可能会受到各种参数的显著影响 **，例如测试设置（即表面电阻率vs.体积电阻率vs.内部电阻率）、** 材料孔隙度和含水量、粘结剂类型/量和辅助胶结材料 **（SCM）的存在沿着以及混合物中使用的骨料的性质（即岩浆vs.变质vs. **沉积岩），这使得用不同的原材料配比的混凝土混合物的实际基准变得复杂。在这种情况下，Giatec Scientific Inc.是一家世界领先的渥太华公司，使用 ** 无线传感器和移动的应用程序的尖端技术来收集与混凝土相关的各种数据。** Giatec最有前途的市场之一是测量常规混凝土中的ER及其与材料随时间推移的机械性能（例如抗压强度）的相关性。Giatec目前正在 ** 寻求混凝土材料专家的专业知识，如申请人通过首次合作，** 研究粘结剂类型/数量和骨料的性质对传统混凝土的ER响应的影响 ** 混合物提供了广泛的原材料。研究结果将有助于Giatec增强其当前的ER设备，提高测试结果的准确性，并提高为以下人员提供的服务的整体质量：

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