Improving sustainable development practice in concrete production through the monitoring of fresh concrete properties using an in-drum sensor

通过使用滚筒内传感器监测新拌混凝土特性，改善混凝土生产中的可持续发展实践

• 批准号: 505235-2016
• 负责人: Jolin, Marc
• 金额: $ 6.06万
• 依托单位: Université Laval
• 依托单位国家: 加拿大
• 项目类别: Collaborative Research and Development Grants
• 财政年份: 2019
• 资助国家: 加拿大
• 起止时间: 2019-01-01 至 2020-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=692285
• 关键词: Improving; sustainable; development; practice; concrete

Concrete is the most utilized construction material and is unique in the way it is produced, transported and then cast in formwork of varying shapes and sizes. From the concrete plant to the job-site, everyone involved closely follow rules and procedures so that a few weeks later, the hardened material has indeed reached its prescribed properties -the most common being compressive strength.Consistent quality in concrete production is an essential element in the ready-mix concrete industry and insuring batch-to-batch uniformity is, in fact, an ever present challenge. Our ability to measure and monitor the properties of fresh concrete before it reaches the formwork, traditionally done by measuring temperature and workability before placement, is of the utmost importance. If irregularities are detected on the fresh concrete (i.e. deviation from the specifications), the load (truck) is rejected resulting in material and time losses, extra costs and even construction issues such as cold joints. In some cases, non-compliance is only detected from the hardened concrete properties evaluation (usually discovered 28 days after concrete placement); the consequences are much more significant at that point, and can go from increased maintenance efforts and/or reduction in the structure's service life to outrageous remedial cost if not complete replacement, thus severely impacting all aspects of sustainability.The last two decades have seen an incense use of modern mixture designs often incorporation of supplementary cementing materials of various types and various origins. The effect is that concrete producers are therefore faced with an increasing number of parameters to control to produce consistent and high quality concretes. The traditional approach of measuring, punctually at the time of delivery, the temperature and workability has unfortunately proven oftentimes its many shortcomings.It is therefore the objective of this CRD Grant to explore means and methods to improve concrete production quality by evaluating the potential of using an in-drum automated sensor system. This will improve the quality of the final product, facilitate real-time quality control activities on the job-site during delivery and allow for substantial waste reduction by reusing more recycled water and reducing the amount of concrete directed to waste.

混凝土是最常用的建筑材料，在生产、运输和浇筑不同形状和尺寸的模板的方式上是独一无二的。从混凝土工厂到施工现场，每个参与的人都严格遵守规则和程序，所以几周后，硬化的材料确实达到了规定的性能——最常见的是抗压强度。在混凝土生产中保持一致的质量是预拌混凝土行业的基本要素，事实上，确保批次到批次的均匀性是一个始终存在的挑战。我们在新混凝土到达模板之前测量和监测其性能的能力是至关重要的，传统上是通过在放置前测量温度和可工作性来完成的。如果在新混凝土上检测到不规则（即与规格不符），则装载（卡车）将被拒绝，导致材料和时间损失，额外成本甚至施工问题，如冷接头。在某些情况下，不符合仅从硬化混凝土性能评估中发现（通常在混凝土浇砌后28天发现）；在这一点上，后果要严重得多，并且可能会增加维护工作和/或减少结构的使用寿命，如果不完全更换，则会导致惊人的补救成本，从而严重影响可持续性的各个方面。在过去的二十年里，人们看到了现代混合设计的大量使用，这些混合设计通常结合了各种类型和各种来源的补充胶结材料。其结果是，混凝土生产商因此面临越来越多的参数控制，以生产一致和高质量的混凝土。传统的测量方法，在交货时准时测量温度和可加工性，不幸的是，它经常被证明有许多缺点。因此，本CRD赠款的目标是通过评估使用桶内自动传感器系统的潜力，探索提高混凝土生产质量的手段和方法。这将提高最终产品的质量，促进交付过程中作业现场的实时质量控制活动，并通过重复使用更多的循环水和减少直接浪费的混凝土量来大量减少废物。