## 1 Introduction  
In recent years, the carbon neutrality movement has been actively implemented worldwide to reduce carbon dioxide (CO\({}_{2}\)) emissions, which constitute the primary cause of global warming [1]. In South Korea, considerable efforts have been made for greenhouse gas (GHG) reduction, such as increasing the 2030 Nationally Determined Contribution (NDC) to 30% [2, 3]. GHG reduction is part of the response to climate change; nevertheless, the impact and damage of climate change caused by GHG emissions in the past are expected to last for the next 50-200 years [4]. In particular, the construction industry, which accounts for approximately 40% of all CO\({}_{2}\) gas emissions, is closely related to climate change, such as global warming [5]. Therefore, GHG reduction is expected to become a crucial issue for the construction industry in the future [6, 7, 8, 9, 10]. Despite global efforts to reduce CO\({}_{2}\) emissions, abnormal climate events, such as the sea level rise, heat waves, and heavy snow, have occurred worldwide [11], including in Korea. Localized torrential rainfall frequently occurs each year, and it is difficult to maintain river water in urban areas with high impervious pavement rates. Additionally, the groundwater level decreases due to reductions in precipitation in the spring and autumn and the shortening of the drought period caused by the gradual change into a subtropical climate [12]. Therefore, rainwater management systems that can deal with such extreme climate change patterns, including floods and droughts, are required. Recently, integrated rainwater management measures, such as the use, infiltration, and detention of rainwater, were introduced in Korea. The primary focus was the installation of large-scale underground retention tanks, which can reduce rainwater runoff during floods. However, there were limitations in improving the overall water circulation in the tank, including infiltration and evapotranspiration. The limited installation locations and high maintenance cost were also limiting factors [13]. Therefore, it is necessary to develop a more economical and eco-friendly rainwater detention system that can prevent rainfall-induced floods by implementing both rainwater infiltration and detention and to ensure the groundwater level through rainwater infiltration in dry seasons. As part of this development, research has been actively conducted on red clay as an eco-friendly material. Red clay has long been used in various areas in Korea. Earthen houses are representative examples of structures built using red clay. Moreover, red clay is an easily available material in Korea as it covers 35% of its land, which increases the usability of red clay [14]. Red clay has also been actively researched in fields, such as beauty, food, and horticulture. In the construction field, methods of using natural materials to replace cement have been studied [15; 16; 17; 18]. For red clay, however, problems with its properties, such as insufficient strength and cracks caused by drying shrinkage, compared to cement, have been noted [19]. In addition, to improve the durability of red clay, it has been used as a building material after being exploited as a ceramic product through the firing process. This method, however, involves complex work processes and is expensive because the red clay structure must be melted and sintered by high heat (high-temperature firing at 1000 \({}^{\circ}\)C or higher). Moreover, the energy consumption and generation of toxic substances by the combustion of fuel to produce a high temperature cause environmental pollution [20]. To address this problem, non-firing technology to ensure a predetermined strength through ionic aggregation and pozzolanic reaction using eco-friendly inorganic binders has been developed [21]. This report presents data for the field application of a prefabricated rainwater detention system.