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Utilization of post-consumer carpet calcium carbonate (PC4) from carpet recycling as a mineral resource in concrete
Resources, Conservation and Recycling ( IF 13.2 ) Pub Date : 2021-02-19 , DOI: 10.1016/j.resconrec.2021.105496
Patrick R. Cunningham , Peter G. Green , Sabbie A. Miller

The short residence time of certain building materials, such as carpets, results in a notable waste stream that has the potential to be a resource for other material systems. In this work, we explore the utilization of post-consumer carpet calcium carbonate (PC4) consisting primarily of the material from carpet backing, which has thus far found few markets, as a potential mineral admixture in the production of concrete. The effects on mechanical and material properties are examined for concrete mixtures with PC4 used as 5 and 15% mass replacement of Portland cement, and PC4 used as 5 and 15% mass replacement of fine aggregates. The effects of PC4 on the slump, air content, unit weight, and setting times were assessed. Additionally, compressive strength, flexural strength, coefficient of thermal expansion, shrinkage, bulk density, void volume, and absorption were measured. Due to the known presence of antimony in PC4, leachate from cured specimens was examined. Additionally, greenhouse gas emissions to manufacture the mixtures were quantified. The results indicate that PC4 can increase air content in concrete by 3.5–10% and decrease the unit weight by up to 11% in fresh concrete. PC4 also led to a loss in compressive strength by up to 60%. Thus, the findings indicate that it is possible to form a less dense, more porous concrete by using PC4 as a mineral constituent in concrete, but with some loss in performance. Through appropriate selection of applications or through supplementary treatment of PC4, it may find a suitable market in the concrete industry.



中文翻译:

将地毯回收中的消费后地毯碳酸钙(PC4)用作混凝土中的矿产资源

某些建筑材料(例如地毯)的短停留时间会导致明显的废物流,该废物流有可能成为其他材料系统的资源。在这项工作中,我们探索了消费后地毯碳酸钙(PC4)的利用,该碳酸钙主要由地毯背衬的材料组成,迄今为止,该市场几乎没有市场,可以用作混凝土生产中的潜在矿物掺合料。检验了混凝土混合物对机械和材料性能的影响,其中PC4用作硅酸盐水泥的5%和15%质量替代品,PC4用作细骨料的5%和15%质量替代品。评估了PC4对坍落度,空气含量,单位重量和凝结时间的影响。此外,抗压强度,抗弯强度,热膨胀系数,收缩率,堆积密度,空隙体积,测定吸收率。由于PC4中存在锑,因此对固化样品中的渗滤液进行了检测。另外,量化了制造混合物的温室气体排放量。结果表明,PC4可使新鲜混凝土中的空气含量增加3.5–10%,并使单位重量减少多达11%。PC4还导致压缩强度损失高达60%。因此,这些发现表明,通过使用PC4作为混凝土中的矿物成分,可以形成密度较小,多孔性更高的混凝土,但性能会有所下降。通过应用程序或通过PC4的辅助治疗合适的选择,它可能会发现在混凝土行业的一个合适的市场。生产混合物的温室气体排放被量化。结果表明,PC4可使新鲜混凝土中的空气含量增加3.5–10%,并使单位重量减少多达11%。PC4还导致压缩强度损失高达60%。因此,这些发现表明,通过使用PC4作为混凝土中的矿物成分,可以形成密度较小,多孔性更高的混凝土,但性能会有所下降。通过应用程序或通过PC4的辅助治疗合适的选择,它可能会发现在混凝土行业的一个合适的市场。生产混合物的温室气体排放被量化。结果表明,PC4可使新鲜混凝土中的空气含量增加3.5–10%,并使单位重量减少多达11%。PC4还导致压缩强度损失高达60%。因此,这些发现表明,通过使用PC4作为混凝土中的矿物成分,可以形成密度较小,多孔性更高的混凝土,但性能会有所下降。通过应用程序或通过PC4的辅助治疗合适的选择,它可能会发现在混凝土行业的一个合适的市场。因此,这些发现表明,通过使用PC4作为混凝土中的矿物成分,可以形成密度较小,多孔性更高的混凝土,但性能会有所下降。通过应用程序或通过PC4的辅助治疗合适的选择,它可能会发现在混凝土行业的一个合适的市场。因此,这些发现表明,通过使用PC4作为混凝土中的矿物成分,可以形成密度较小,多孔性更高的混凝土,但性能会有所下降。通过应用程序或通过PC4的辅助治疗合适的选择,它可能会发现在混凝土行业的一个合适的市场。

更新日期:2021-02-21
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