Development of Industrial Waste Incorporated Concrete for 3D Printing Construction in Chloride-Loaded Environment
Disciplines
Civil Engineering
Abstract (300 words maximum)
The transformation from over-exploitation to sustainable development has been prioritized in the construction industry as the mass production of concrete has caused enormous environmental and ecological issues. 3D concrete printing (3DCP) involves the process of assembling materials by printing a series of single filament stacks to build 3D models. It has gained popularity in the construction industry as it makes the core construction process faster, cleaner, and more cost-effective. However, the use of high-flow materials for 3DCP can result in poor performance due to the separation of materials, the generation of a large volume of voids, and the reduction in interlayer adhesion, which collectively put 3DCP buildings at risk of failure when exposed to chloride-laden conditions. To maximize the advantages of 3DCP, especially for roadways and marine infrastructure, this study develops new 3DCP mixes sourced from local industrial waste, such as fly ash, slag, and sewage sludge ash. The durability of the 3DCP mixes is then evaluated in a chloride-loaded environment, where chloride intrusion into the near-surface pores of the concrete is focused as an underlying damage mechanism. Since chloride ingress is attributed to chloride binding with cement hydrates at microscale, understanding cement hydration is the key to characterizing the physicochemical properties and complex interactions with chloride for durable 3D-printed concrete. The proposed research program aims at: 1) investigating the impact of embedded waste on 3DCP; 2) correlating the performance indicators of 3D printed concrete with mix design parameters; and 3) evaluating the impact of chloride ingress on the performance of 3D printed concrete using concrete resistivity model. The findings of the research will advance our understanding of cement hydration and its interactions with chloride and lead to an optimum design method for sustainable and durable 3DCP construction.
Academic department under which the project should be listed
SPCEET - Civil and Environmental Engineering
Primary Investigator (PI) Name
Youngguk Seo
Development of Industrial Waste Incorporated Concrete for 3D Printing Construction in Chloride-Loaded Environment
The transformation from over-exploitation to sustainable development has been prioritized in the construction industry as the mass production of concrete has caused enormous environmental and ecological issues. 3D concrete printing (3DCP) involves the process of assembling materials by printing a series of single filament stacks to build 3D models. It has gained popularity in the construction industry as it makes the core construction process faster, cleaner, and more cost-effective. However, the use of high-flow materials for 3DCP can result in poor performance due to the separation of materials, the generation of a large volume of voids, and the reduction in interlayer adhesion, which collectively put 3DCP buildings at risk of failure when exposed to chloride-laden conditions. To maximize the advantages of 3DCP, especially for roadways and marine infrastructure, this study develops new 3DCP mixes sourced from local industrial waste, such as fly ash, slag, and sewage sludge ash. The durability of the 3DCP mixes is then evaluated in a chloride-loaded environment, where chloride intrusion into the near-surface pores of the concrete is focused as an underlying damage mechanism. Since chloride ingress is attributed to chloride binding with cement hydrates at microscale, understanding cement hydration is the key to characterizing the physicochemical properties and complex interactions with chloride for durable 3D-printed concrete. The proposed research program aims at: 1) investigating the impact of embedded waste on 3DCP; 2) correlating the performance indicators of 3D printed concrete with mix design parameters; and 3) evaluating the impact of chloride ingress on the performance of 3D printed concrete using concrete resistivity model. The findings of the research will advance our understanding of cement hydration and its interactions with chloride and lead to an optimum design method for sustainable and durable 3DCP construction.