## 1 Introduction  
Climate change has emerged as a serious risk factor that threatens the survival of the entire human race from the environmental and ecological aspects, despite exerting the international efforts for several decades [1]. The CO\({}_{2}\) concentration in the atmosphere has increased by approximately 39% since the industrial revolution. Even if carbon emissions are stopped right now, it is expected to take at least 50-200 years to return to the CO\({}_{2}\) level before the industrial revolution [1]. To cope with this problem, global greenhouse gas (GHG) reduction measures have been made, such as the Kyoto Protocol to the United Nations Framework Convention on Climate Change to tackle global warming [2]. According to the fourth report of the Intergovernmental Panel on Climate Change (IPCC), the global mean temperature has risen by 0.74 \({}^{\circ}\)C for the last 100 years and is expected to rise by up to 6.4 \({}^{\circ}\)C by the end of the 21 st century [1,3].  
As such, climate change is a critical global issue, and as one of the world's top 10 countries in GHG emissions, South Korea has set up \"carbon reduction technology development\" as a new pillar of national development vision, developed related technologies and established laws since 2008 [4]. In addition, South Korea showed the highest annual increasing rate of 6.2% in the transportation sector of GHG emissions from 1990 to 2000 among the Organization for Economic Co-operation and Development (OECD) member countries. To take part in the development of carbon reduction technologies in the road sector, which accounts for 16% of the total GHG emissions, the need for the development of design and development technologies to absorb and reduce CO\({}_{2}\) to minimize CO\({}_{2}\) emissions is emerging [4]. Recently, the secondary environmental pollution problem is appearing due to the increase of industrial byproducts such as mining byproducts and coal incineration ashes [4]. For efficient processing of industrial byproducts, some of the industrial byproducts are mixed with existing cement or asphalt materials and these mixtures are used as construction materials [4]. Comprehensive Assessment System for Building Environmental Efficiency (CASBEE) in Japan has evaluated the GHG emissions of building materials using the CO\({}_{2}\) emission database of major materials since 2010 [5; 6; 7]. Building performance is now a major concern of professionals in the building industry and environmental building performance assessment has emerged as one of the major issues in sustainable construction [8; 9; 10; 11]. Efforts to reduce CO\({}_{2}\) emission are being made through the use of procurement systems for low CO\({}_{2}\) emission materials and the application of high-strength concrete at construction sites. As a part of such research, there is a demand for the establishment of a quantitative assessment method of CO\({}_{2}\) emission from concrete production to site procurement and a proposal of a CO\({}_{2}\) reduction plan at construction sites [12]. However, the utilization of materials for CO\({}_{2}\) capture is still insufficient. The development of concrete applying CO\({}_{2}\) reduction technology is considered to be a leading technology for the society as a whole, as well as for the construction sector. The MIT Technology Review selected \"Green Concrete\", which is a CO\({}_{2}\) reducing concrete, one of top 10 new technologies in 2010 [4; 13].  
Therefore, in this study, we aim to develop carbon-capturing concrete using industrial byproducts that can satisfy not only passive carbon reduction function but also active carbon reduction function through the utilization of industrial byproducts. To develop a carbon-capturing concrete using blast-furnace slag powder, which is one of the representative industrial byproducts, we conducted an experimental study on the mechanical and durability characteristics of carbon-capturing concrete composed of blast-furnace slag using carbon capture activator.