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Alkali-activated slag concrete with paper industry waste
Waste Management & Research ( IF 3.9 ) Pub Date : 2021-02-03 , DOI: 10.1177/0734242x20983890
Maria Mavroulidou 1 , Shamil Shah 1, 2
Affiliation  

Pulp and paper manufacturing and recycling industries are a resource-intensive sector, generating 25–40% of the annual municipal solid waste worldwide. Waste includes abundant volumes of paper sludge, as well as the product of its incineration, namely paper sludge ash. These two waste materials are both predominantly landfilled. There is thus a drive for additional valorisation routes for these materials. This short communication focuses on the potential use of paper sludge ash in alkali-activated cement concrete; this type of concrete was estimated to potentially reduce CO2 emissions by up to 5–6 times, while it can also incorporate waste materials or industrial by-products in its composition. The paper presents a laboratory study assessing the feasibility of structural alkali-activated cement concrete with ground granulated blastfurnace slag (a by-product of steel production) and paper sludge ash. Paper sludge ash is used mainly as a source of Ca(OH)2 in the alkaline activator solution, and secondly as an additional source of aluminosilicates. A number of factors potentially affecting the activation process and the resulting concrete quality were investigated, including different dosage of activators, curing conditions and curing time. Mixes with paper sludge ash in the activator system developed high early concrete strengths at ambient temperatures and maintained adequate strengths for structural concrete. Further mix optimisation and mechanical and durability testing, accompanied by material characterisation, are required to establish the advantages of using this waste material in structural alkali-activated cement concrete.



中文翻译:

造纸工业废渣碱活化矿渣混凝土

纸浆和造纸业与回收业是资源密集型行业,每年产生全球25%至40%的城市固体废物。废物包括大量的纸污泥及其焚化产物,即纸污泥灰。这两种废料都主要被填埋。因此,存在对这些材料的附加的增值途径的驱动。这次简短的交流着重于纸浆渣灰在碱活化水泥混凝土中的潜在用途;据估计,这种类型的混凝土有可能减少CO 2排放量高达5到6倍,同时还可以将废料或工业副产品纳入其组成。本文提出了一项实验室研究,评估了用磨碎的高炉矿渣(钢铁生产的副产品)和纸渣产生的结构碱活化水泥混凝土的可行性。纸污泥灰主要用作Ca(OH)2的来源在碱性活化剂溶液中,其次作为铝硅酸盐的额外来源。研究了许多可能影响活化过程和最终混凝土质量的因素,包括活化剂的用量,固化条件和固化时间。在活化剂系统中,与纸泥灰的混合物在环境温度下具有较高的早期混凝土强度,并为结构混凝土保持了足够的强度。为了确定在结构碱活化水泥混凝土中使用这种废料的优势,还需要进行进一步的混合优化,机械性能和耐久性测试以及材料特性鉴定。

更新日期:2021-02-04
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