Sustainable utilization of industrial by-products spent foundry sand and cement kiln dust in controlled low strength materials (CLSM)

水泥窑 水泥 骨料(复合) 铸造厂 渗滤液 材料科学 抗压强度 环境友好型 环境科学 废物管理 复合材料 冶金 工程类 生态学 生物
作者
J. C. Aggarwal,Shweta Goyal,Maneek Kumar
出处
期刊:Construction and Building Materials [Elsevier]
卷期号:404: 133315-133315
标识
DOI:10.1016/j.conbuildmat.2023.133315
摘要

In the present study, industrial by-products, spent foundry sand (SFS) and cement kiln dust (CKD) were used for developing controlled low strength materials (CLSM) and their various fresh and hardened state properties were examined. Embedded energy (EE), Embedded carbon dioxide (ECO2) as well as leachate toxicity of CLSM were also evaluated. Conventional fine aggregates were completely replaced by SFS; while CKD replaced cement at 0%, 25%, 50%, 75% and 100% levels; with the binder to aggregate ratio as 1:10. All the CLSM mixes were obtained while maintaining the flowability at around 250 mm. Addition of CKD increased flow and bleeding, delayed setting time and reduced compressive strength. The findings also indicate that SFS with even 100% CKD can be successfully utilized to prepare excavatable, eco-friendly and sustainable CLSM with bearing resistance equivalent to well compacted sands, suitable for general purpose backfill and utility trench filling. Mix with 75% CKD and 100% SFS as the only fine aggregate proved most suited from most of the aspects of a practical CLSM. All the proposed CLSM mixes were found to be environment friendly w.r.t leachate toxicity, low EE and ECO2. The study offers CLSM as an important alternative for the sustainable utilization of by-products in large quantities.
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