加入两种工业副产品——石料填料和铸造砂——的水工混凝土耐久性研究:三大工业的协同解决方案

Guilliana Agudelo , Carlos A. Palacio , Sergio Neves Monteiro , Henry A. Colorado
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摘要

本文研究了在水工混凝土中添加两种工业副产物,以及添加偏高岭土对其耐久性的影响。所使用的副产品是生产沥青混凝土的石骨料填料和铸造砂。这一发展对环境的影响是重大的,因为它涉及为这项研究合作的三个大型工业:混凝土、金属铸造和集料采矿,在其他地方,特别是在发展中国家具有相当大的经济影响。石料经干燥预热制得沥青,而铸造砂则经炼铁制得。通过在25℃下进行的膨胀测试,测试了砂浆棒中添加物的有效性。本研究还旨在确定添加物如何影响膨胀和碱-硅反应,从而提高混凝土的耐久性。结果表明,两副产物均可归为N型火山灰,掺加骨料填料可使膨胀率降低32.9%;占铸造砂的36.84%;偏高岭土占71%在NaOH中浸泡18天,通过XRD和SEM对样品的微观结构进行了分析,发现样品中存在硅酸盐、低晶长石、石英、堇青石、方解石、钙辉石、黑云母和钠长石等相。扫描电镜显示了其中的一些相,以及asr -凝胶(碱-硅反应)在聚集体周围的玫瑰花状结构。在所有评估的砂浆中都发现了ASR凝胶。最后,一个重要的结果是,这项调查是作为大学与工业界合作进行的,为废物提供了真正的绿色解决方案。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Hydraulic concrete durability studies with the addition of two industrial byproducts, stone aggregate filler, and foundry sand: A collaborative solution for three large industries
This research investigates the use of two industrial byproducts added to hydraulic concrete and their impact on its durability when metakaolin is added. The byproducts used were a stone aggregate filler from the production of asphalt concrete, and foundry sand. The environmental impact of this development is significant as it involves three large industries that collaborated for the study: concrete, metal casting, and aggregate mining, quite economically influential elsewhere but particularly in developing countries. The stone aggregate was obtained after a drying and preheating process of the stone aggregates to produce asphalt, while the foundry sand is obtained after iron smelting. The effectiveness of the additions in mortar bars was tested by the expansion measurements conducted at 25 °C. This study also aims to determine how the additions affect the expansion and the alkali-silica reaction, which could increase the concretés durability. It was found that both byproducts can be classified as type N pozzolans and that achieve an expansion reduction of 32.9 % with the aggregate filler; of 36.84 % with the foundry sand; and of 71 % with the metakaolin. The microstructure of samples was evaluated via XRD and SEM over the samples immersed in NaOH during 18 days, revealing phases such as portlandite, oligoclase, quartz, cordierite, calcite, coesite, biotite, and albite. The SEM showed some of these phases as well as, in addition to the ASR-gel (alkali-silica reaction) as a rosette around aggregates. It was found the ASR gel in all the mortars evaluated. Last, one important outcome is that this investigation was conducted as a University-Industry collaboration, enabling a real green solution for the wastes.
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