Stępień Justyna, Maciejewski Krzysztof
Department of Transportation Engineering, Faculty of Civil Engineering and Architecture, Kielce University of Technology, Aleja Tysiąclecia Państwa Polskiego 7, 25-314 Kielce, Poland.
Materials (Basel). 2022 Jul 26;15(15):5175. doi: 10.3390/ma15155175.
The paper presents the results of exploratory research on the use of reclaimed cement concrete in cold-recycled mixes with foamed bitumen. Because reclaimed cement concrete, unlike natural aggregates, is expected to have a residue of the non-hydrated cement covering the aggregate grains, which may result in a secondary cementation process after its application in a road base, this avenue was explored by tracking the time evolution of the compressive strength of the final material. The tests were performed using two mixtures, i.e., a reference mixture and a mixture containing 25% reclaimed cement concrete. The mixtures containing reclaimed cement concrete were characterized by increased uniaxial compressive strengths after each curing period (3, 4, 7, 14 and 28 days)-by 11.5 kPa on average and e.g., 498 kPa vs. 506 kPa after 28 days. The obtained differences between the mixtures were not found to be statistically significant. The small effects of the incorporation of reclaimed cement concrete were attributed to the time passed typically between the demolition and new pavement construction and to the presence of a second binding material-bitumen.
本文介绍了对再生水泥混凝土用于泡沫沥青冷再生混合料的探索性研究结果。由于与天然集料不同，再生水泥混凝土预计在集料颗粒表面会残留未水化的水泥，这可能导致其应用于道路基层后发生二次胶结过程，因此通过跟踪最终材料抗压强度随时间的变化来探索这一途径。试验使用了两种混合料，即一种参考混合料和一种含有25%再生水泥混凝土的混合料。含有再生水泥混凝土的混合料在每个养护期（3天、4天、7天、14天和28天）后的单轴抗压强度均有所提高，平均提高了11.5 kPa，例如，28天后分别为498 kPa和506 kPa。未发现混合料之间的差异具有统计学意义。再生水泥混凝土掺入的影响较小，这归因于拆除与新路面施工之间通常经过的时间以及第二种粘结材料——沥青的存在。
