Carbon-conditioning or chemical permeation methods can provide excellent microstructural improvements to recycled concrete and brick aggregate; however, the applications have their limitations. Further, recycled brick aggregate cannot be effectively carbon-conditioned with conventional methods as it contains only trace amounts of reactive materials. It is therefore a necessity to use hybrid methods involving dual technologies combining carbon-conditioning and chemical permeation for its improvement. This paper is focused on developing a novel hybrid method for improving the microstructural properties of recycled concrete aggregate and recycled brick aggregate for concrete usage. This study conducts particle density, water absorption and crushing value tests to measure the physical improvements achieved with the novel hybrid method, and utilises a variety of chemicals and a reaction chamber for carbon-conditioning for aggregate treatment. The study evinces that both the recycled concrete aggregate and recycled brick aggregate experienced significant improvements, with 10 mm and 20 mm recycled concrete aggregate and 10 mm recycled brick aggregate exceeding the density of virgin aggregate. Magnesium hydroxide plus carbon dioxide (Mg(OH)₂ (s) + CO₂ (g)) treatment for recycled concrete aggregate and calcium hydroxide plus magnesium hydroxide plus carbon dioxide (Ca(OH)₂ (s) + Mg(OH)₂ (s) + 2CO₂ (g)) treatment for recycled brick aggregate can be considered as potential candidates for optimal hybrid treatment methods.

中文翻译：

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改进再生混凝土和砖骨料微观结构的混合方法用于生产高档混凝土

碳调节或化学渗透方法可以为再生混凝土和砖骨料提供出色的微观结构改进；但是，这些应用程序有其局限性。此外，回收的砖骨料不能用传统方法进行有效的碳调节，因为它只含有微量的活性物质。因此，有必要使用混合方法，包括结合碳调节和化学渗透的双重技术来改进它。本文的重点是开发一种新的混合方法，以改善混凝土用再生混凝土骨料和再生砖骨料的微观结构性能。本研究进行了颗粒密度、吸水率和压碎值测试，以衡量采用新型混合方法实现的物理改进，并利用各种化学品和反应室进行碳调节以进行骨料处理。研究表明，再生混凝土骨料和再生砖骨料都有显着改善，10 毫米和 20 毫米再生混凝土骨料和 10 毫米再生砖骨料的密度超过了原生骨料。氢氧化镁加二氧化碳 (Mg(OH)₂ (s) + CO ₂ (g)) 再生混凝土骨料与氢氧化钙加氢氧化镁加二氧化碳处理(Ca(OH) ₂ (s) + Mg(OH) ₂ (s) + 2CO ₂ (g))再生砖骨料的处理可以被认为是最佳混合处理方法的潜在候选者。