Kępniak Maja, Woyciechowski Piotr, Franus Wojciech
Department of Building Materials Engineering, Warsaw University of Technology, 00-637 Warsaw, Poland.
Faculty of Civil Engineering and Architecture, Lublin University of Technology, 20-618 Lublin, Poland.
Materials (Basel). 2021 Nov 27;14(23):7254. doi: 10.3390/ma14237254.
Modification of concrete with waste materials is an increasingly common process, and they are primarily used as a partial substitution for cement. In the case of inert or nearly inert additions according to EN 206, the effectiveness of such a modification mainly concerns ecological aspects and, only to a small extent, mechanical properties. This article analyses the effect of modifying cement concrete with waste limestone powder as a partial substitution for fine aggregate. The analysed waste arises as a result of the accumulation of dust produced during the initial preparation of aggregate for the production of hot mix asphalt (HMA). In order to analyse the effect of waste on compressive strength, an experimental design was prepared with variable substitution levels and variable water/cement ratios. Compressive strength tests were performed after 28 to 90 days. Statistical analysis of the results was performed. Microscopic evaluation of the fractures of the samples was carried out to clarify the mechanism of transition zone enhancement, which resulted in an increase of compressive strength of the composite.
用废料对混凝土进行改性是一个越来越常见的过程，这些废料主要用作水泥的部分替代品。根据EN 206，对于惰性或近乎惰性的添加物，这种改性的有效性主要涉及生态方面，而在机械性能方面的影响较小。本文分析了用废弃石灰石粉作为细集料的部分替代品对水泥混凝土进行改性的效果。所分析的废料是在热拌沥青（HMA）生产中集料初始制备过程中产生的粉尘积累所致。为了分析废料对抗压强度的影响，制备了具有不同替代水平和不同水灰比的实验设计。在28至90天后进行抗压强度试验。对结果进行了统计分析。对样品的断裂进行了微观评估，以阐明过渡区增强的机制，这导致了复合材料抗压强度的提高。
