Abstract
My research focuses on exploring the potential for reducing carbon emissions in concrete
production by focusing on one construction method. This practice includes altering the types of
aggregates used in concrete mixes for construction purposes. Specifically, I examine the
feasibility and environmental benefits of replacing conventional aggregates with low-carbon
alternatives, such as recycled aggregates or those derived from sustainable sources. I also aim to
explain how sustainable aggregates help decarbonize concrete practices and how they positively
affect local communities and global markets while creating a push for clean energy sources.
My thesis suggests that by shifting towards sustainable aggregate options, the construction sector
could significantly reduce its carbon footprint. In turn, this reduction in emissions could create a
broader transition to clean energy sources. The objectives of this study are to identify the
environmental benefits of different aggregate alternatives, assess the positive impacts of their
use, and analyze the potential economic and policy changes needed to implement this alternative
solution on a large scale. The significance of my research is in its ability to influence sustainable
construction practices globally, offering a pathway towards a low-carbon future for the building
sector. By analyzing the environmental benefits of low-carbon construction, my research may
encourage a broader shift in policy and investment, ultimately leading to a more integrated,
sustainable energy system that includes clean energy production and sustainable construction
practices.
The Concrete Canoe Capstone team led advanced research and development in 3D
printed concrete (3DPC) to develop the first ever process for designing and building a 3D printed
post-tensioned concrete canoe. The team consists of three sub-teams: Mix Design, Hull Design
and Construction. The developments made by all teams will be used to create a repeatable
process for creating a full-size, 3D printed, post-tensioned, concrete canoe.
The Mix Design team was tasked with researching, developing, and testing a concrete
mix design that adheres to construction standards while also being printable. They made multiple
mix tables; performed compression, flexural beam, and dog bone testing; and mixed the concrete
that was used in molding the canoe. Through this research and mix testing, the Mix Design team
accumulated valuable knowledge on lightweight printable aggregates.
The Hull Design team designed and analyzed the shape of the canoe hull. The team
formulated curve equations, modeled the canoe in AutoCAD, and performed structural and
buoyancy calculations. The calculations included stresses and strains, freeboard, and volumes
and weights of different canoe types. They also designed a reusable mold that could be used to
replicate the process of 3D printing concrete canoes.
The Construction team designed the canoe molding process and the post-tensioning
system that was used to attach the molded pieces of the canoe. They designed a solution for
successfully attaching the molded pieces, so that the canoe remained strong and hydrodynamic.
The construction analysis included performing post tensioning calculations, spacing calculations,
and torque wrench calculations. At the end of the process, the Construction team oversaw the
creation of the final prototype.
