用经不同二氧化碳压力处理的再生混凝土骨料替代混凝土,提高性能并减少对环境的影响

Fouad Ismail Ismail, Miras Mamirov, Seunghee Kim, Jiong Hu
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摘要

最近的研究表明,对再生混凝土骨料(RCA)进行碳化处理,可通过将粘合糊转化为更坚固、更致密的产品来提高其性能。此外,使用 RCA 并在二氧化碳处理过程中封存二氧化碳有助于减少混凝土的碳足迹。本研究评估了由二氧化碳处理过的 RCA 制成的再生骨料混凝土 (RAC) 的性能。在不同的二氧化碳压力(5、10、20、40 和 60 磅/平方英寸 [psi])下,对从 20 多条旧公路和机场路面中获得的 RCA 进行了处理。然后对 RCA 的物理和机械性能进行了检测。使用未处理和处理过的 RCA 对天然粗骨料进行了完全替代,然后对由此产生的 RAC 的新鲜、机械和耐久性能进行了评估。此外,还评估了加入未处理和处理过的 RCA 的混凝土的环保性能。实验结果表明,二氧化碳处理压力对 RCA 特性有显著影响,从而明显改善了 RAC 的机械和耐久性能。结果表明,在 20、40 和 60 磅/平方英寸的压力下进行二氧化碳处理,完全替代 RCA 的混凝土可获得与天然骨料混凝土相当的性能。此外,与使用天然骨料或未经处理的 RCA 混凝土相比,使用二氧化碳处理过的 RCA 所生产的 RAC 减少了二氧化碳当量。这些发现强调了二氧化碳处理的 RCA 作为天然骨料的一种可行且环保的替代品,在可持续混凝土生产中的潜力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Enhancing Performance and Reducing Environmental Impact of Concrete with Replacement of Recycled Concrete Aggregate Treated with Various CO2 Pressures
Recent studies have demonstrated that the carbonation treatment of recycled concrete aggregate (RCA) could enhance its properties by the conversion of adhesive paste to stronger and denser products. In addition, the use of RCA and the sequestration of CO2 during the CO2-treatment process can help to reduce the carbon footprint of concrete. This study assesses the performance of recycled aggregate concrete (RAC) developed from CO2-treated RCA. RCAs obtained from over 20 old highway and airfield pavements were treated under different pressures (5, 10, 20, 40, and 60 pounds per square inch [psi]) of CO2. The physical and mechanical properties of RCA were then examined. The complete substitution of natural coarse aggregate was carried out using both untreated and treated RCA, followed by an assessment of the resulting RAC’s fresh, mechanical, and durability properties. Furthermore, the environmental performance of concrete incorporating untreated and treated RCA was evaluated. The experimental findings revealed that the CO2 treatment pressure had a significant influence on RCA characteristics, leading to notable improvements in the mechanical and durability properties of RAC. Results demonstrated that by employing CO2 treatment at pressures of 20, 40, and 60 psi, concrete incorporating complete RCA replacement can achieve properties comparable to concrete with natural aggregate. Moreover, the RAC produced using CO2-treated RCA demonstrated a reduced CO2 equivalent when compared with concrete incorporating natural aggregate or untreated RCA. These findings underscore the potential of CO2-treated RCA as a viable and environmentally friendly alternative to natural aggregate for sustainable concrete production.
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