Abstract

The growing interest in industrial applications of the hemp plant requires alternative solutions for disposing of hemp waste. At the same time, the concrete industry is seeking ways to reduce its environmental impact, which could be realized by partially replacing Portland cement with more sustainable materials. In this study, a two-step valorization strategy of hemp waste is explored, including the use of hemp waste as biofuel and the addition to concrete of the biofuel by-product, hemp ash, as partial cement replacement. Hemp waste was incinerated in a muffle furnace at different combustion regimes and the residual hemp ash was analyzed before being added to some concrete mixes. Concretes with different hemp ash replacements (5–25% by cement weight) were tested for compression strength, air content, workability, and water absorption. Results showed that hemp ash has the potential to be added to concrete as a filler to reduce environmental impact and costs at 5% cement replacement.

Graphic Abstract

中文翻译：

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在水泥和混凝土生产中将大麻废料作为生物燃料和水泥的替代品进行补偿

摘要

大麻工厂对工业应用的兴趣日益浓厚，因此需要用于处理大麻废物的替代解决方案。同时，混凝土行业正在寻求减少环境影响的方法，这可以通过用更具可持续性的材料部分替代波特兰水泥来实现。在这项研究中，探索了大麻废弃物的两步增值策略，包括使用大麻废弃物作为生物燃料，以及在混凝土中添加生物燃料副产物大麻灰作为水泥的部分替代品。大麻废料在马弗炉中以不同的燃烧方式进行焚化，在将残余的大麻灰添加到某些混凝土混合物中之前先进行分析。测试了使用不同的大麻灰替代品（水泥重量的5-25％）的混凝土的抗压强度，空气含量，可加工性和吸水率。

图形摘要