Advanced maturity technique for pre-packaged concrete materials

Giatec Scientific Inc.最近开发了一种紧凑型无线设备（SmartBox），可以监测混凝土在养护期间和养护后的性能变化。利用复杂的算法对传感器数据进行分析，根据混凝土的电阻率和温度实时估计混凝土的性能。该技术的一个潜在应用是监测混凝土修复材料的早期特性，这些材料通常是来自各种制造商的预先包装的“袋装”混凝土，在新鲜状态（即和易性和凝固时间）和硬化后（即成熟度、强度发展和耐久性）具有一系列行为。Giatec和渥太华大学的Martin Noel博士的研究合作将致力于研究测量时间、温度、电阻率和混凝土在新鲜和硬化状态下的性能之间的关系，特别是凝结时间和抗压强度的发展。预包装混凝土修复材料采用专有的混合设计，结合胶凝材料、骨料和外加剂的不同组合，以产生给定应用所需的特性。超过75种不同类型的商业产品已被确定在加拿大使用，尽管这些产品通常可以根据其主要特征进行分类。拟议的项目将重点关注25种修复产品，这些产品被认为是加拿大使用最广泛、结构最重要的混合物，也代表了一系列不同类型、制造商和应用。该项目的目标是通过详细研究电阻率、温度、新鲜和硬化性能之间的关系，开发一种基于成熟度概念的先进技术。实验计划将包括总共450个测试样本。将研究25种不同的预包装混凝土产品，每种类型将制作18个混凝土圆柱体。每组中有3个钢瓶将采用SmartBox技术测量温度和电阻率，另外15个钢瓶将进行压缩测试。

Giatec Scientific Inc. recently developed a compact wireless device (SmartBox) that can monitor changes in concrete properties during and after curing. The sensor data is analyzed using sophisticated algorithms to estimate the properties of the concrete in real-time based on its electrical resistivity and temperature. One potential application for this technology is to monitor the early-age properties of concrete repair materials, which often come as prepackaged "bagged" concrete from a variety of manufacturers with a range of behaviours at the fresh state (i.e. workability and setting time) and after hardening (i.e. maturity, strength development and durability). The research collaboration between Giatec and Dr. Martin Noel at the University of Ottawa will aim to study the relationship between measured time, temperature, and electrical resistivity, and concrete properties at the fresh and hardened states, especially setting time and compressive strength development. Prepackaged concrete repair materials are produced using proprietary mix designs incorporating different combinations of cementitious materials, aggregates, and admixtures, to produce the desired characteristics for a given application. Over 75 different types of commercially available products have been identified for use in Canada, although these can generally be classified into groups based on their main characteristics. The proposed project will focus on the 25 repair products which are considered to be the most widely used and structurally important mixtures in Canada, and also representing a range of different types, manufacturers, and applications. The objective of this project is to develop an advanced technique based on the maturity concept for bagged concrete repair materials through a detailed study of the correlation between electrical resistivity, temperature, and the fresh and hardened properties. The experimental program will consist of a total of 450 test specimens. Twenty-five different prepackaged concrete products will be studied, and 18 concrete cylinders will be fabricated for each type. Three cylinders from each group will be instrumented with SmartBox technology to measure temperature and resistivity, and 15 cylinders will be tested in compression.