Safety Risk Prevention and Control‐based Analysis of Carbon Emission Reduction by Construction Waste Maden Recycled Aggregate Subgrade

Abstract In recent years, the occurrence of extreme weather is more and more frequent, severe extreme weather leads to subgrade water damage, slope instability and other safety problems. Especially in flood season, the damage of subgrade drainage facilities, as well as the erosion of roadbed slope, may cause a serious threat to the safety of roadbed, a large number of roadbed reconstruction and safety risk protection become a problem. As a by‐product of the development of the construction industry, a large amount of carbon emissions will be released when construction waste is disposed. Analysing the carbon reduction potential of the resource treatment of construction waste will promotes the construction industry's transition to a low‐carbon model. In this study, taking a vehicle section of Line 12 of the Zhengzhou Metro as an example, recycled aggregates (RA) from construction and demolition waste (CDW) were used to replace natural materials (NM) in backfilling the road base, and their quality was tested to meet the architectural design standards in order to be used as a safety guarantee subgrade backfill. LCA was used to identify and quantify the material and energy consumption of each unit process, analyse the carbon emissions of the entire construction process and its various stages, and compare the process with a landfill case to measure the carbon reduction benefits of this resource‐based treatment method. Finally, it is concluded that the construction waste maden recycled aggregate subgrade has significant advantages in safety risk prevention and control and carbon reduction benefits.