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: 2017
• 资助国家: 加拿大
• 起止时间: 2017-01-01 至 2018-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=618020
• 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.

混凝土是使用最多的建筑材料，在生产、运输和浇注各种形状和大小的模板方面也是独一无二的。从混凝土厂到工地，每个参与其中的人都严格遵守规则和程序，几周后，硬化材料确实达到了规定的性能--最常见的是抗压强度。混凝土生产中的一致性质量是预拌混凝土行业的基本要素，确保批次之间的一致性实际上是一个始终存在的挑战。我们在新浇筑混凝土到达模板之前测量和监控其性能的能力至关重要，传统上是通过在浇筑前测量温度和工作性来完成的。如果在新浇注的混凝土上发现不规则性(即与规格不符)，则会拒绝装载(卡车)，从而导致材料和时间损失、额外成本甚至施工问题(如冷缝)。在某些情况下，只有在硬化混凝土性能评估中才能发现不符合要求的情况(通常在混凝土浇注后28天发现)；在这一点上，后果要严重得多，从增加维护工作量和/或减少结构的使用寿命，到如果不能完全更换，就会产生惊人的补救成本，从而严重影响可持续发展的方方面面。过去20年来，现代混合料设计的熏香使用通常包括各种类型和不同来源的辅助胶凝材料。其结果是，混凝土生产商因此面临着越来越多的参数需要控制，以生产一致和高质量的混凝土。不幸的是，传统的在交货时准时测量温度和工作性的方法已经证明了它的许多缺点。因此，这项CRD赠款的目标是通过评估使用鼓内自动传感器系统的潜力来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，促进交货过程中现场的实时质量控制活动，并通过重复使用更多的再生水和减少用于废物的混凝土数量，大幅减少废物。