Borucka-Lipska Jolanta, Brzozowski Piotr, Błyszko Jarosław, Bednarek Roman, Horszczaruk Elżbieta
Department of Reinforced Concrete Structures and Concrete Technology, Faculty of Civil and Environmental Engineering, West Pomeranian University of Technology in Szczecin, 70-310 Szczecin, Poland.
Department of Geotechnics, Faculty of Construction and Environmental Engineering, West Pomeranian University of Technology in Szczecin, 70-310 Szczecin, Poland.
Materials (Basel). 2020 Dec 31;14(1):148. doi: 10.3390/ma14010148.
Using the waste materials in the production of the building materials limits the storage of the wastes, burdensome for the environment and landscape, and makes possible to manufacture the materials and products with the use of the less volume of the raw materials. Cement concretes and mortars as the basic building materials offer the broad prospects of utilization of the recyclable or waste materials. The wastes from the iron ore processing are the solid wastes resulting from the process of enrichment of the ore concentrate. The paper presents the results of testing three mortars, in which a part of fine aggregate was replaced with the iron oxide concentrate (IOC) resulting from such a process. IOC has been used as a substitute of 10%, 20% and 30% (by mass) of the fine aggregate. The effect of the concentrate on the mechanical performance of the mortars at the high temperature (up to 600 °C) was also investigated. The IOC is a neutral material, not affecting chemically the process of cement hydration. The addition of IOC slightly improves the strength of the cement mortars (by 5% to 10%). In the case of the larger amount (20-30%) of the addition, the use of superplasticizer is necessary. The IOC significantly improves the high temperature resistance of the cement mortars (300 °C). The cement mortars containing 30% of the IOC addition keep 80% of the initial flexural and compressive strength when exposed to the temperature 450 °C.
在建筑材料生产中使用废料，可减少废料储存，减轻对环境和景观的负担，并能利用较少体积的原材料制造材料和产品。水泥混凝土和砂浆作为基本建筑材料，为可回收或废料的利用提供了广阔前景。铁矿石加工产生的废料是精矿富集过程中产生的固体废物。本文展示了三种砂浆的测试结果，其中一部分细集料被该过程产生的氧化铁精矿（IOC）替代。IOC替代了10%、20%和30%（质量）的细集料。还研究了该精矿对高温（高达600℃）下砂浆力学性能的影响。IOC是一种中性材料，不会对水泥水化过程产生化学影响。添加IOC可略微提高水泥砂浆强度（提高5%至10%）。在添加量较大（20 - 30%）的情况下，需要使用高效减水剂。IOC显著提高了水泥砂浆在300℃时的耐高温性能。添加30%IOC的水泥砂浆在450℃温度下仍保持初始抗折和抗压强度的80%。
