不同模內水化程度及預處理時間對混凝土碳封存之影響

Abstract

二氧化碳（CO₂）是導致全球氣候變化的主要溫室氣體之一，其排放主要來自於燃燒化石燃料（如煤炭、石油和天然氣）以及森林砍伐等人類活動。過去幾十年，全球二氧化碳排放量不斷增加，導致溫室氣體濃度上升。為應對氣候變化，許多國家和國際組織已開始採取措施減少二氧化碳排放，如推廣可再生能源、提高能源效率和發展碳捕集與封存技術等。 針對碳封存技術，混凝土中的一些成分能與二氧化碳反應生成碳酸鈣，這種碳封存方法既能減少大氣中的二氧化碳，又能提高混凝土的耐久性。許多學者正在研究如何在不影響混凝土性能的情況下最大限度地提高其碳封存能力，這可能成為未來具有發展性的碳封存技術之一。 本研究封存二氧化碳的方式主要為碳化養護，其中針對與”水”最相關的三個碳化養護參數作探討，因碳化養護中二氧化碳是利用試體內蒸散之水分形成的孔隙進入，因此與水相關的碳化養護參數分別為水灰比、模內水化時間、預處理時間，在這三者的參數搭配下，進行碳化養護流程後，對其二氧化碳吸收量、28天抗壓強度、碳化深度分析，比較以上參數對碳化養護之混凝土的影響。

關鍵詞：全球暖化、碳化養護參數、碳封存、水泥砂漿、混凝土

Carbon dioxide (CO₂) is one of the main greenhouse gases contributing to global climate change. Its emissions primarily come from the burning of fossil fuels (such as coal, oil, and natural gas) and deforestation. Over the past few decades, global CO₂ emissions have continuously increased, leading to higher concentrations of greenhouse gases. To address climate change, many countries and international organizations have begun to take measures to reduce CO₂ emissions, such as promoting renewable energy, improving energy efficiency, and developing carbon capture and storage technologies. Regarding carbon capture and storage, certain components in concrete can react with CO₂ to form calcium carbonate. This method of carbon sequestration not only reduces CO₂ in the atmosphere but also enhances the durability of concrete. Many researchers are studying how to maximize the carbon sequestration capacity of concrete without compromising its performance, making this a potentially promising carbon capture technology for the future. This study primarily utilizes carbonation curing to sequester carbon dioxide, focusing on the three carbonation curing parameters most related to "water." During carbonation curing, carbon dioxide enters through the pores formed by the evaporation of water within the specimen. Therefore, the water-related carbonation curing parameters are the water-cement ratio, in-mold hydration time, and preconditioning time. Under the combination of these three parameters, after the carbonation curing process, the study analyzes the carbon dioxide absorption, 28-day compressive strength, and carbonation depth to compare the effects of these parameters on the concrete subjected to carbonation curing. Keywords：global warning、carbonation curing parameters、carbon capture and storage、mortar、concrete