在可渗透的互锁混凝土铺路块上回收用过的咖啡渣

Joel Lee, Hyunho Song, Jaeyoung Park, Sugjoon Lee
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摘要

咖啡渣(scg)是煮咖啡的副产品,在废弃的垃圾填埋场分解会释放出大量的强效温室气体。本研究旨在探讨scg的最大回收比例,一种非常规填充材料,渗透联锁混凝土铺装(PICP)块。这些砌块具有多孔结构,有助于减轻表面积水,同时保持良好的结构性能。利用扫描电子显微镜图像分析,从颗粒状表面特征和测量的孔隙大小推断出scg的吸水率。通过流动表试验确定水- scg填料比呈非线性趋势,建立本研究PICP试件的水灰比。在不补砂的9种不同SCG配比的PICP试件中,以10% SCG填料为拐点的试件表现出最高的抗压强度和抗折强度,分别达到18 MPa和6 MPa。最后,尽管由于10% scg的额外1.69%的重量,PICP样品的渗透率比对照样品降低了67%,但最大10% scg含量的PICP样品仍然保持了0.47 mm/s的足够渗透率。根据经测试的PICP样品的性能,最多10%的SCG填料有可能应用于混凝土块市场,可回收韩国每年咖啡消费量的27%,减少焚烧产生的碳排放量超过13,000吨。
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Recycling Spent Coffee Grounds on Permeable Interlocking Concrete Paving Blocks
Decomposition of spent coffee grounds (SCGs), a byproduct of brewing coffee, in disposed landfill sites releases significant amounts of potent greenhouse gases. This study aims to investigate the maximum recycling proportions of SCGs, a nonconventional filler material, for permeable interlocking concrete paving (PICP) blocks. These blocks have a porous structure that helps mitigate surface ponding while maintaining sound structural performance. Using Scanning Electron Microscope image analysis, the water absorbency of SCGs is inferred from the granular surface features of SCGs with voids of measured sizes. The flow table test was conducted to determine the water-to-SCG filler ratio, following a nonlinear trend, and then establish the water-to-cement ratio for constructing PICP specimens for this study. Among a range of PICP specimens with 9 different proportions of SCGs without replacing sand, those containing the 10% SCG filler as an inflection point exhibited the highest performance, achieving 18 MPa of compressive strength and 6 MPa of flexural strength, respectively. Conclusively, the PICP specimens with a maximum 10 % SCGs still maintained sufficient permeability at 0.47 mm/second, despite a 67% reduction compared to the control sample, attributed to the additional 1.69% weight of 10% SCGs. Based on the proven performance of tested PICP specimens, a maximum of 10% SCG filler has the potential to be applied in the concrete block market for recycling up to 27% of the annual Korean coffee consumption, reducing carbon emissions by more than 13,000 tons from incineration.
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