Durability and Mechanical Characteristics of Blast-Furnace Slag Based Activated Carbon-Capturing Concrete with Respect to Cement Content

Abstract

The recent abnormal temperature phenomena such as the rise of global mean temperature and sea level due to global climate change are clear threats that can no longer be overlooked to the human beings who have pursued indiscriminate development and rapid growth. Climate change has emerged as a serious risk that threatens the survival of the entire human race from the environmental and ecological aspects, despite international efforts for several decades. 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. Therefore, we conducted an experimental study to develop a carbon-capturing concrete that has active as well as passive carbon reduction functions using blast-furnace slag, an industrial byproduct, instead of cement. For active carbon reduction, we used calcium hydroxide and sodium silicate as carbon capture activators, and conducted tests on mechanical properties and durability characteristics. 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 carb...

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